54b900827b
The identifier of keys created/registred should be in the application range. This is by spec for key creation. This may change for registered key. Signed-off-by: Ronald Cron <ronald.cron@arm.com>
6391 lines
221 KiB
C
6391 lines
221 KiB
C
/*
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* PSA crypto layer on top of Mbed TLS crypto
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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#include "psa_crypto_service_integration.h"
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#include "psa/crypto.h"
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#include "psa_crypto_core.h"
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#include "psa_crypto_invasive.h"
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#include "psa_crypto_driver_wrappers.h"
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#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
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#include "psa_crypto_se.h"
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#endif
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#include "psa_crypto_slot_management.h"
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/* Include internal declarations that are useful for implementing persistently
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* stored keys. */
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#include "psa_crypto_storage.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "mbedtls/platform.h"
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#if !defined(MBEDTLS_PLATFORM_C)
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#define mbedtls_calloc calloc
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#define mbedtls_free free
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#endif
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#include "mbedtls/arc4.h"
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#include "mbedtls/asn1.h"
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#include "mbedtls/asn1write.h"
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#include "mbedtls/bignum.h"
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#include "mbedtls/blowfish.h"
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#include "mbedtls/camellia.h"
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#include "mbedtls/chacha20.h"
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#include "mbedtls/chachapoly.h"
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#include "mbedtls/cipher.h"
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#include "mbedtls/ccm.h"
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#include "mbedtls/cmac.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/des.h"
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#include "mbedtls/ecdh.h"
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#include "mbedtls/ecp.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/error.h"
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#include "mbedtls/gcm.h"
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#include "mbedtls/md2.h"
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#include "mbedtls/md4.h"
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#include "mbedtls/md5.h"
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#include "mbedtls/md.h"
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#include "mbedtls/md_internal.h"
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#include "mbedtls/pk.h"
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#include "mbedtls/pk_internal.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include "mbedtls/ripemd160.h"
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#include "mbedtls/rsa.h"
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#include "mbedtls/sha1.h"
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#include "mbedtls/sha256.h"
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#include "mbedtls/sha512.h"
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#include "mbedtls/xtea.h"
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#define ARRAY_LENGTH( array ) ( sizeof( array ) / sizeof( *( array ) ) )
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/* constant-time buffer comparison */
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static inline int safer_memcmp( const uint8_t *a, const uint8_t *b, size_t n )
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{
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size_t i;
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unsigned char diff = 0;
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for( i = 0; i < n; i++ )
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diff |= a[i] ^ b[i];
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return( diff );
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}
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/****************************************************************/
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/* Global data, support functions and library management */
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/****************************************************************/
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static int key_type_is_raw_bytes( psa_key_type_t type )
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{
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return( PSA_KEY_TYPE_IS_UNSTRUCTURED( type ) );
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}
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/* Values for psa_global_data_t::rng_state */
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#define RNG_NOT_INITIALIZED 0
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#define RNG_INITIALIZED 1
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#define RNG_SEEDED 2
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typedef struct
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{
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void (* entropy_init )( mbedtls_entropy_context *ctx );
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void (* entropy_free )( mbedtls_entropy_context *ctx );
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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unsigned initialized : 1;
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unsigned rng_state : 2;
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} psa_global_data_t;
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static psa_global_data_t global_data;
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#define GUARD_MODULE_INITIALIZED \
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if( global_data.initialized == 0 ) \
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return( PSA_ERROR_BAD_STATE );
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psa_status_t mbedtls_to_psa_error( int ret )
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{
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/* If there's both a high-level code and low-level code, dispatch on
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* the high-level code. */
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switch( ret < -0x7f ? - ( -ret & 0x7f80 ) : ret )
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{
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case 0:
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return( PSA_SUCCESS );
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case MBEDTLS_ERR_AES_INVALID_KEY_LENGTH:
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case MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH:
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case MBEDTLS_ERR_AES_FEATURE_UNAVAILABLE:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_AES_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_ARC4_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_ASN1_OUT_OF_DATA:
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case MBEDTLS_ERR_ASN1_UNEXPECTED_TAG:
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case MBEDTLS_ERR_ASN1_INVALID_LENGTH:
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case MBEDTLS_ERR_ASN1_LENGTH_MISMATCH:
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case MBEDTLS_ERR_ASN1_INVALID_DATA:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_ASN1_ALLOC_FAILED:
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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case MBEDTLS_ERR_ASN1_BUF_TOO_SMALL:
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return( PSA_ERROR_BUFFER_TOO_SMALL );
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#if defined(MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA)
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case MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA:
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#elif defined(MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH)
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case MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH:
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#endif
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case MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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#if defined(MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA)
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case MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA:
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#elif defined(MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH)
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case MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH:
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#endif
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case MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_CAMELLIA_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_CCM_BAD_INPUT:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_CCM_AUTH_FAILED:
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return( PSA_ERROR_INVALID_SIGNATURE );
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case MBEDTLS_ERR_CCM_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_CHACHAPOLY_BAD_STATE:
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return( PSA_ERROR_BAD_STATE );
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case MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED:
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return( PSA_ERROR_INVALID_SIGNATURE );
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case MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_CIPHER_ALLOC_FAILED:
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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case MBEDTLS_ERR_CIPHER_INVALID_PADDING:
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return( PSA_ERROR_INVALID_PADDING );
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case MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_CIPHER_AUTH_FAILED:
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return( PSA_ERROR_INVALID_SIGNATURE );
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case MBEDTLS_ERR_CIPHER_INVALID_CONTEXT:
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return( PSA_ERROR_CORRUPTION_DETECTED );
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case MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED:
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return( PSA_ERROR_INSUFFICIENT_ENTROPY );
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case MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG:
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case MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR:
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return( PSA_ERROR_INSUFFICIENT_ENTROPY );
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case MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_DES_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED:
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case MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE:
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case MBEDTLS_ERR_ENTROPY_SOURCE_FAILED:
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return( PSA_ERROR_INSUFFICIENT_ENTROPY );
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case MBEDTLS_ERR_GCM_AUTH_FAILED:
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return( PSA_ERROR_INVALID_SIGNATURE );
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case MBEDTLS_ERR_GCM_BAD_INPUT:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_GCM_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_MD2_HW_ACCEL_FAILED:
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case MBEDTLS_ERR_MD4_HW_ACCEL_FAILED:
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case MBEDTLS_ERR_MD5_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_MD_BAD_INPUT_DATA:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_MD_ALLOC_FAILED:
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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case MBEDTLS_ERR_MD_FILE_IO_ERROR:
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return( PSA_ERROR_STORAGE_FAILURE );
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case MBEDTLS_ERR_MD_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_MPI_FILE_IO_ERROR:
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return( PSA_ERROR_STORAGE_FAILURE );
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case MBEDTLS_ERR_MPI_BAD_INPUT_DATA:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_MPI_INVALID_CHARACTER:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:
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return( PSA_ERROR_BUFFER_TOO_SMALL );
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case MBEDTLS_ERR_MPI_NEGATIVE_VALUE:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_MPI_DIVISION_BY_ZERO:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_MPI_NOT_ACCEPTABLE:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_MPI_ALLOC_FAILED:
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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case MBEDTLS_ERR_PK_ALLOC_FAILED:
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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case MBEDTLS_ERR_PK_TYPE_MISMATCH:
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case MBEDTLS_ERR_PK_BAD_INPUT_DATA:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_PK_FILE_IO_ERROR:
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return( PSA_ERROR_STORAGE_FAILURE );
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case MBEDTLS_ERR_PK_KEY_INVALID_VERSION:
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case MBEDTLS_ERR_PK_KEY_INVALID_FORMAT:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_PK_UNKNOWN_PK_ALG:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_PK_PASSWORD_REQUIRED:
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case MBEDTLS_ERR_PK_PASSWORD_MISMATCH:
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return( PSA_ERROR_NOT_PERMITTED );
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case MBEDTLS_ERR_PK_INVALID_PUBKEY:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_PK_INVALID_ALG:
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case MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE:
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case MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_PK_SIG_LEN_MISMATCH:
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return( PSA_ERROR_INVALID_SIGNATURE );
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case MBEDTLS_ERR_PK_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_RIPEMD160_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_RSA_BAD_INPUT_DATA:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_RSA_INVALID_PADDING:
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return( PSA_ERROR_INVALID_PADDING );
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case MBEDTLS_ERR_RSA_KEY_GEN_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_RSA_KEY_CHECK_FAILED:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_RSA_PUBLIC_FAILED:
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case MBEDTLS_ERR_RSA_PRIVATE_FAILED:
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return( PSA_ERROR_CORRUPTION_DETECTED );
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case MBEDTLS_ERR_RSA_VERIFY_FAILED:
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return( PSA_ERROR_INVALID_SIGNATURE );
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case MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE:
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return( PSA_ERROR_BUFFER_TOO_SMALL );
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case MBEDTLS_ERR_RSA_RNG_FAILED:
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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case MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_RSA_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_SHA1_HW_ACCEL_FAILED:
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case MBEDTLS_ERR_SHA256_HW_ACCEL_FAILED:
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case MBEDTLS_ERR_SHA512_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_XTEA_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_ECP_BAD_INPUT_DATA:
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case MBEDTLS_ERR_ECP_INVALID_KEY:
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return( PSA_ERROR_INVALID_ARGUMENT );
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case MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL:
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return( PSA_ERROR_BUFFER_TOO_SMALL );
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case MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH:
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case MBEDTLS_ERR_ECP_VERIFY_FAILED:
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return( PSA_ERROR_INVALID_SIGNATURE );
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case MBEDTLS_ERR_ECP_ALLOC_FAILED:
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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case MBEDTLS_ERR_ECP_HW_ACCEL_FAILED:
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return( PSA_ERROR_HARDWARE_FAILURE );
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case MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED:
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return( PSA_ERROR_CORRUPTION_DETECTED );
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default:
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return( PSA_ERROR_GENERIC_ERROR );
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}
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}
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/****************************************************************/
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/* Key management */
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/****************************************************************/
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#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
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static inline int psa_key_slot_is_external( const psa_key_slot_t *slot )
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{
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return( psa_key_lifetime_is_external( slot->attr.lifetime ) );
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}
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#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
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|
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#if defined(MBEDTLS_ECP_C)
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mbedtls_ecp_group_id mbedtls_ecc_group_of_psa( psa_ecc_family_t curve,
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size_t byte_length )
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{
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switch( curve )
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{
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case PSA_ECC_FAMILY_SECP_R1:
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switch( byte_length )
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{
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case PSA_BITS_TO_BYTES( 192 ):
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return( MBEDTLS_ECP_DP_SECP192R1 );
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case PSA_BITS_TO_BYTES( 224 ):
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return( MBEDTLS_ECP_DP_SECP224R1 );
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case PSA_BITS_TO_BYTES( 256 ):
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return( MBEDTLS_ECP_DP_SECP256R1 );
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case PSA_BITS_TO_BYTES( 384 ):
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return( MBEDTLS_ECP_DP_SECP384R1 );
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case PSA_BITS_TO_BYTES( 521 ):
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return( MBEDTLS_ECP_DP_SECP521R1 );
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default:
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return( MBEDTLS_ECP_DP_NONE );
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}
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break;
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case PSA_ECC_FAMILY_BRAINPOOL_P_R1:
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switch( byte_length )
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{
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case PSA_BITS_TO_BYTES( 256 ):
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return( MBEDTLS_ECP_DP_BP256R1 );
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case PSA_BITS_TO_BYTES( 384 ):
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return( MBEDTLS_ECP_DP_BP384R1 );
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case PSA_BITS_TO_BYTES( 512 ):
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return( MBEDTLS_ECP_DP_BP512R1 );
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default:
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return( MBEDTLS_ECP_DP_NONE );
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}
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break;
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case PSA_ECC_FAMILY_MONTGOMERY:
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switch( byte_length )
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{
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case PSA_BITS_TO_BYTES( 255 ):
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return( MBEDTLS_ECP_DP_CURVE25519 );
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case PSA_BITS_TO_BYTES( 448 ):
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return( MBEDTLS_ECP_DP_CURVE448 );
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default:
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return( MBEDTLS_ECP_DP_NONE );
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}
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break;
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case PSA_ECC_FAMILY_SECP_K1:
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switch( byte_length )
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{
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case PSA_BITS_TO_BYTES( 192 ):
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return( MBEDTLS_ECP_DP_SECP192K1 );
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|
case PSA_BITS_TO_BYTES( 224 ):
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return( MBEDTLS_ECP_DP_SECP224K1 );
|
|
case PSA_BITS_TO_BYTES( 256 ):
|
|
return( MBEDTLS_ECP_DP_SECP256K1 );
|
|
default:
|
|
return( MBEDTLS_ECP_DP_NONE );
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return( MBEDTLS_ECP_DP_NONE );
|
|
}
|
|
}
|
|
#endif /* defined(MBEDTLS_ECP_C) */
|
|
|
|
static psa_status_t validate_unstructured_key_bit_size( psa_key_type_t type,
|
|
size_t bits )
|
|
{
|
|
/* Check that the bit size is acceptable for the key type */
|
|
switch( type )
|
|
{
|
|
case PSA_KEY_TYPE_RAW_DATA:
|
|
#if defined(MBEDTLS_MD_C)
|
|
case PSA_KEY_TYPE_HMAC:
|
|
#endif
|
|
case PSA_KEY_TYPE_DERIVE:
|
|
break;
|
|
#if defined(MBEDTLS_AES_C)
|
|
case PSA_KEY_TYPE_AES:
|
|
if( bits != 128 && bits != 192 && bits != 256 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_CAMELLIA_C)
|
|
case PSA_KEY_TYPE_CAMELLIA:
|
|
if( bits != 128 && bits != 192 && bits != 256 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_DES_C)
|
|
case PSA_KEY_TYPE_DES:
|
|
if( bits != 64 && bits != 128 && bits != 192 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_ARC4_C)
|
|
case PSA_KEY_TYPE_ARC4:
|
|
if( bits < 8 || bits > 2048 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_CHACHA20_C)
|
|
case PSA_KEY_TYPE_CHACHA20:
|
|
if( bits != 256 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
break;
|
|
#endif
|
|
default:
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
if( bits % 8 != 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
|
|
#if defined(MBEDTLS_PK_PARSE_C)
|
|
/* Mbed TLS doesn't support non-byte-aligned key sizes (i.e. key sizes
|
|
* that are not a multiple of 8) well. For example, there is only
|
|
* mbedtls_rsa_get_len(), which returns a number of bytes, and no
|
|
* way to return the exact bit size of a key.
|
|
* To keep things simple, reject non-byte-aligned key sizes. */
|
|
static psa_status_t psa_check_rsa_key_byte_aligned(
|
|
const mbedtls_rsa_context *rsa )
|
|
{
|
|
mbedtls_mpi n;
|
|
psa_status_t status;
|
|
mbedtls_mpi_init( &n );
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_rsa_export( rsa, &n, NULL, NULL, NULL, NULL ) );
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
if( mbedtls_mpi_bitlen( &n ) % 8 != 0 )
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
}
|
|
mbedtls_mpi_free( &n );
|
|
return( status );
|
|
}
|
|
#endif /* MBEDTLS_PK_PARSE_C */
|
|
|
|
/** Load the contents of a key buffer into an internal RSA representation
|
|
*
|
|
* \param[in] type The type of key contained in \p data.
|
|
* \param[in] data The buffer from which to load the representation.
|
|
* \param[in] data_length The size in bytes of \p data.
|
|
* \param[out] p_rsa Returns a pointer to an RSA context on success.
|
|
* The caller is responsible for freeing both the
|
|
* contents of the context and the context itself
|
|
* when done.
|
|
*/
|
|
static psa_status_t psa_load_rsa_representation( psa_key_type_t type,
|
|
const uint8_t *data,
|
|
size_t data_length,
|
|
mbedtls_rsa_context **p_rsa )
|
|
{
|
|
#if defined(MBEDTLS_PK_PARSE_C)
|
|
psa_status_t status;
|
|
mbedtls_pk_context ctx;
|
|
size_t bits;
|
|
mbedtls_pk_init( &ctx );
|
|
|
|
/* Parse the data. */
|
|
if( PSA_KEY_TYPE_IS_KEY_PAIR( type ) )
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_pk_parse_key( &ctx, data, data_length, NULL, 0 ) );
|
|
else
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_pk_parse_public_key( &ctx, data, data_length ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* We have something that the pkparse module recognizes. If it is a
|
|
* valid RSA key, store it. */
|
|
if( mbedtls_pk_get_type( &ctx ) != MBEDTLS_PK_RSA )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
/* The size of an RSA key doesn't have to be a multiple of 8. Mbed TLS
|
|
* supports non-byte-aligned key sizes, but not well. For example,
|
|
* mbedtls_rsa_get_len() returns the key size in bytes, not in bits. */
|
|
bits = PSA_BYTES_TO_BITS( mbedtls_rsa_get_len( mbedtls_pk_rsa( ctx ) ) );
|
|
if( bits > PSA_VENDOR_RSA_MAX_KEY_BITS )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
status = psa_check_rsa_key_byte_aligned( mbedtls_pk_rsa( ctx ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* Copy out the pointer to the RSA context, and reset the PK context
|
|
* such that pk_free doesn't free the RSA context we just grabbed. */
|
|
*p_rsa = mbedtls_pk_rsa( ctx );
|
|
ctx.pk_info = NULL;
|
|
|
|
exit:
|
|
mbedtls_pk_free( &ctx );
|
|
return( status );
|
|
#else
|
|
(void) data;
|
|
(void) data_length;
|
|
(void) type;
|
|
(void) rsa;
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
#endif /* MBEDTLS_PK_PARSE_C */
|
|
}
|
|
|
|
/** Export an RSA key to export representation
|
|
*
|
|
* \param[in] type The type of key (public/private) to export
|
|
* \param[in] rsa The internal RSA representation from which to export
|
|
* \param[out] data The buffer to export to
|
|
* \param[in] data_size The length of the buffer to export to
|
|
* \param[out] data_length The amount of bytes written to \p data
|
|
*/
|
|
static psa_status_t psa_export_rsa_key( psa_key_type_t type,
|
|
mbedtls_rsa_context *rsa,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length )
|
|
{
|
|
#if defined(MBEDTLS_PK_WRITE_C)
|
|
int ret;
|
|
mbedtls_pk_context pk;
|
|
uint8_t *pos = data + data_size;
|
|
|
|
mbedtls_pk_init( &pk );
|
|
pk.pk_info = &mbedtls_rsa_info;
|
|
pk.pk_ctx = rsa;
|
|
|
|
/* PSA Crypto API defines the format of an RSA key as a DER-encoded
|
|
* representation of the non-encrypted PKCS#1 RSAPrivateKey for a
|
|
* private key and of the RFC3279 RSAPublicKey for a public key. */
|
|
if( PSA_KEY_TYPE_IS_KEY_PAIR( type ) )
|
|
ret = mbedtls_pk_write_key_der( &pk, data, data_size );
|
|
else
|
|
ret = mbedtls_pk_write_pubkey( &pos, data, &pk );
|
|
|
|
if( ret < 0 )
|
|
{
|
|
/* Clean up in case pk_write failed halfway through. */
|
|
memset( data, 0, data_size );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
|
|
/* The mbedtls_pk_xxx functions write to the end of the buffer.
|
|
* Move the data to the beginning and erase remaining data
|
|
* at the original location. */
|
|
if( 2 * (size_t) ret <= data_size )
|
|
{
|
|
memcpy( data, data + data_size - ret, ret );
|
|
memset( data + data_size - ret, 0, ret );
|
|
}
|
|
else if( (size_t) ret < data_size )
|
|
{
|
|
memmove( data, data + data_size - ret, ret );
|
|
memset( data + ret, 0, data_size - ret );
|
|
}
|
|
|
|
*data_length = ret;
|
|
return( PSA_SUCCESS );
|
|
#else
|
|
(void) type;
|
|
(void) rsa;
|
|
(void) data;
|
|
(void) data_size;
|
|
(void) data_length;
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
#endif /* MBEDTLS_PK_WRITE_C */
|
|
}
|
|
|
|
/** Import an RSA key from import representation to a slot
|
|
*
|
|
* \param[in,out] slot The slot where to store the export representation to
|
|
* \param[in] data The buffer containing the import representation
|
|
* \param[in] data_length The amount of bytes in \p data
|
|
*/
|
|
static psa_status_t psa_import_rsa_key( psa_key_slot_t *slot,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
psa_status_t status;
|
|
uint8_t* output = NULL;
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
|
|
/* Parse input */
|
|
status = psa_load_rsa_representation( slot->attr.type,
|
|
data,
|
|
data_length,
|
|
&rsa );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
slot->attr.bits = (psa_key_bits_t) PSA_BYTES_TO_BITS(
|
|
mbedtls_rsa_get_len( rsa ) );
|
|
|
|
/* Re-export the data to PSA export format, such that we can store export
|
|
* representation in the key slot. Export representation in case of RSA is
|
|
* the smallest representation that's allowed as input, so a straight-up
|
|
* allocation of the same size as the input buffer will be large enough. */
|
|
output = mbedtls_calloc( 1, data_length );
|
|
if( output == NULL )
|
|
{
|
|
status = PSA_ERROR_INSUFFICIENT_MEMORY;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_export_rsa_key( slot->attr.type,
|
|
rsa,
|
|
output,
|
|
data_length,
|
|
&data_length);
|
|
exit:
|
|
/* Always free the RSA object */
|
|
mbedtls_rsa_free( rsa );
|
|
mbedtls_free( rsa );
|
|
|
|
/* Free the allocated buffer only on error. */
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
mbedtls_free( output );
|
|
return( status );
|
|
}
|
|
|
|
/* On success, store the allocated export-formatted key. */
|
|
slot->data.key.data = output;
|
|
slot->data.key.bytes = data_length;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
#endif /* defined(MBEDTLS_RSA_C) */
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
/** Load the contents of a key buffer into an internal ECP representation
|
|
*
|
|
* \param[in] type The type of key contained in \p data.
|
|
* \param[in] data The buffer from which to load the representation.
|
|
* \param[in] data_length The size in bytes of \p data.
|
|
* \param[out] p_ecp Returns a pointer to an ECP context on success.
|
|
* The caller is responsible for freeing both the
|
|
* contents of the context and the context itself
|
|
* when done.
|
|
*/
|
|
static psa_status_t psa_load_ecp_representation( psa_key_type_t type,
|
|
const uint8_t *data,
|
|
size_t data_length,
|
|
mbedtls_ecp_keypair **p_ecp )
|
|
{
|
|
mbedtls_ecp_group_id grp_id = MBEDTLS_ECP_DP_NONE;
|
|
psa_status_t status;
|
|
mbedtls_ecp_keypair *ecp = NULL;
|
|
size_t curve_size = data_length;
|
|
|
|
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) &&
|
|
PSA_KEY_TYPE_ECC_GET_FAMILY( type ) != PSA_ECC_FAMILY_MONTGOMERY )
|
|
{
|
|
/* A Weierstrass public key is represented as:
|
|
* - The byte 0x04;
|
|
* - `x_P` as a `ceiling(m/8)`-byte string, big-endian;
|
|
* - `y_P` as a `ceiling(m/8)`-byte string, big-endian.
|
|
* So its data length is 2m+1 where m is the curve size in bits.
|
|
*/
|
|
if( ( data_length & 1 ) == 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
curve_size = data_length / 2;
|
|
|
|
/* Montgomery public keys are represented in compressed format, meaning
|
|
* their curve_size is equal to the amount of input. */
|
|
|
|
/* Private keys are represented in uncompressed private random integer
|
|
* format, meaning their curve_size is equal to the amount of input. */
|
|
}
|
|
|
|
/* Allocate and initialize a key representation. */
|
|
ecp = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
|
|
if( ecp == NULL )
|
|
return( PSA_ERROR_INSUFFICIENT_MEMORY );
|
|
mbedtls_ecp_keypair_init( ecp );
|
|
|
|
/* Load the group. */
|
|
grp_id = mbedtls_ecc_group_of_psa( PSA_KEY_TYPE_ECC_GET_FAMILY( type ),
|
|
curve_size );
|
|
if( grp_id == MBEDTLS_ECP_DP_NONE )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecp_group_load( &ecp->grp, grp_id ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* Load the key material. */
|
|
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) )
|
|
{
|
|
/* Load the public value. */
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecp_point_read_binary( &ecp->grp, &ecp->Q,
|
|
data,
|
|
data_length ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* Check that the point is on the curve. */
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecp_check_pubkey( &ecp->grp, &ecp->Q ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
}
|
|
else
|
|
{
|
|
/* Load and validate the secret value. */
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecp_read_key( ecp->grp.id,
|
|
ecp,
|
|
data,
|
|
data_length ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
}
|
|
|
|
*p_ecp = ecp;
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
mbedtls_ecp_keypair_free( ecp );
|
|
mbedtls_free( ecp );
|
|
}
|
|
|
|
return( status );
|
|
}
|
|
|
|
/** Export an ECP key to export representation
|
|
*
|
|
* \param[in] type The type of key (public/private) to export
|
|
* \param[in] ecp The internal ECP representation from which to export
|
|
* \param[out] data The buffer to export to
|
|
* \param[in] data_size The length of the buffer to export to
|
|
* \param[out] data_length The amount of bytes written to \p data
|
|
*/
|
|
static psa_status_t psa_export_ecp_key( psa_key_type_t type,
|
|
mbedtls_ecp_keypair *ecp,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length )
|
|
{
|
|
psa_status_t status;
|
|
|
|
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) )
|
|
{
|
|
/* Check whether the public part is loaded */
|
|
if( mbedtls_ecp_is_zero( &ecp->Q ) )
|
|
{
|
|
/* Calculate the public key */
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
|
|
mbedtls_ctr_drbg_random, &global_data.ctr_drbg ) );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
}
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecp_point_write_binary( &ecp->grp, &ecp->Q,
|
|
MBEDTLS_ECP_PF_UNCOMPRESSED,
|
|
data_length,
|
|
data,
|
|
data_size ) );
|
|
if( status != PSA_SUCCESS )
|
|
memset( data, 0, data_size );
|
|
|
|
return( status );
|
|
}
|
|
else
|
|
{
|
|
if( data_size < PSA_BITS_TO_BYTES( ecp->grp.nbits ) )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecp_write_key( ecp,
|
|
data,
|
|
PSA_BITS_TO_BYTES( ecp->grp.nbits ) ) );
|
|
if( status == PSA_SUCCESS )
|
|
*data_length = PSA_BITS_TO_BYTES( ecp->grp.nbits );
|
|
else
|
|
memset( data, 0, data_size );
|
|
|
|
return( status );
|
|
}
|
|
}
|
|
|
|
/** Import an ECP key from import representation to a slot
|
|
*
|
|
* \param[in,out] slot The slot where to store the export representation to
|
|
* \param[in] data The buffer containing the import representation
|
|
* \param[in] data_length The amount of bytes in \p data
|
|
*/
|
|
static psa_status_t psa_import_ecp_key( psa_key_slot_t *slot,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
psa_status_t status;
|
|
uint8_t* output = NULL;
|
|
mbedtls_ecp_keypair *ecp = NULL;
|
|
|
|
/* Parse input */
|
|
status = psa_load_ecp_representation( slot->attr.type,
|
|
data,
|
|
data_length,
|
|
&ecp );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
if( PSA_KEY_TYPE_ECC_GET_FAMILY( slot->attr.type ) == PSA_ECC_FAMILY_MONTGOMERY)
|
|
slot->attr.bits = (psa_key_bits_t) ecp->grp.nbits + 1;
|
|
else
|
|
slot->attr.bits = (psa_key_bits_t) ecp->grp.nbits;
|
|
|
|
/* Re-export the data to PSA export format. There is currently no support
|
|
* for other input formats then the export format, so this is a 1-1
|
|
* copy operation. */
|
|
output = mbedtls_calloc( 1, data_length );
|
|
if( output == NULL )
|
|
{
|
|
status = PSA_ERROR_INSUFFICIENT_MEMORY;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_export_ecp_key( slot->attr.type,
|
|
ecp,
|
|
output,
|
|
data_length,
|
|
&data_length);
|
|
exit:
|
|
/* Always free the PK object (will also free contained ECP context) */
|
|
mbedtls_ecp_keypair_free( ecp );
|
|
mbedtls_free( ecp );
|
|
|
|
/* Free the allocated buffer only on error. */
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
mbedtls_free( output );
|
|
return( status );
|
|
}
|
|
|
|
/* On success, store the allocated export-formatted key. */
|
|
slot->data.key.data = output;
|
|
slot->data.key.bytes = data_length;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
#endif /* defined(MBEDTLS_ECP_C) */
|
|
|
|
/** Return the size of the key in the given slot, in bits.
|
|
*
|
|
* \param[in] slot A key slot.
|
|
*
|
|
* \return The key size in bits, read from the metadata in the slot.
|
|
*/
|
|
static inline size_t psa_get_key_slot_bits( const psa_key_slot_t *slot )
|
|
{
|
|
return( slot->attr.bits );
|
|
}
|
|
|
|
/** Try to allocate a buffer to an empty key slot.
|
|
*
|
|
* \param[in,out] slot Key slot to attach buffer to.
|
|
* \param[in] buffer_length Requested size of the buffer.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* The buffer has been successfully allocated.
|
|
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
|
|
* Not enough memory was available for allocation.
|
|
* \retval #PSA_ERROR_ALREADY_EXISTS
|
|
* Trying to allocate a buffer to a non-empty key slot.
|
|
*/
|
|
static psa_status_t psa_allocate_buffer_to_slot( psa_key_slot_t *slot,
|
|
size_t buffer_length )
|
|
{
|
|
if( slot->data.key.data != NULL )
|
|
return( PSA_ERROR_ALREADY_EXISTS );
|
|
|
|
slot->data.key.data = mbedtls_calloc( 1, buffer_length );
|
|
if( slot->data.key.data == NULL )
|
|
return( PSA_ERROR_INSUFFICIENT_MEMORY );
|
|
|
|
slot->data.key.bytes = buffer_length;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_copy_key_material_into_slot( psa_key_slot_t *slot,
|
|
const uint8_t* data,
|
|
size_t data_length )
|
|
{
|
|
psa_status_t status = psa_allocate_buffer_to_slot( slot,
|
|
data_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
memcpy( slot->data.key.data, data, data_length );
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/** Import key data into a slot.
|
|
*
|
|
* `slot->type` must have been set previously.
|
|
* This function assumes that the slot does not contain any key material yet.
|
|
* On failure, the slot content is unchanged.
|
|
*
|
|
* Persistent storage is not affected.
|
|
*
|
|
* \param[in,out] slot The key slot to import data into.
|
|
* Its `type` field must have previously been set to
|
|
* the desired key type.
|
|
* It must not contain any key material yet.
|
|
* \param[in] data Buffer containing the key material to parse and import.
|
|
* \param data_length Size of \p data in bytes.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
* \retval #PSA_ERROR_NOT_SUPPORTED
|
|
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
|
|
*/
|
|
static psa_status_t psa_import_key_into_slot( psa_key_slot_t *slot,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
psa_status_t status = PSA_SUCCESS;
|
|
size_t bit_size;
|
|
|
|
/* zero-length keys are never supported. */
|
|
if( data_length == 0 )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
if( key_type_is_raw_bytes( slot->attr.type ) )
|
|
{
|
|
bit_size = PSA_BYTES_TO_BITS( data_length );
|
|
|
|
/* Ensure that the bytes-to-bits conversion hasn't overflown. */
|
|
if( data_length > SIZE_MAX / 8 )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
/* Enforce a size limit, and in particular ensure that the bit
|
|
* size fits in its representation type. */
|
|
if( bit_size > PSA_MAX_KEY_BITS )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
status = validate_unstructured_key_bit_size( slot->attr.type, bit_size );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
/* Allocate memory for the key */
|
|
status = psa_copy_key_material_into_slot( slot, data, data_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
/* Write the actual key size to the slot.
|
|
* psa_start_key_creation() wrote the size declared by the
|
|
* caller, which may be 0 (meaning unspecified) or wrong. */
|
|
slot->attr.bits = (psa_key_bits_t) bit_size;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
else if( PSA_KEY_TYPE_IS_ASYMMETRIC( slot->attr.type ) )
|
|
{
|
|
/* Try validation through accelerators first. */
|
|
bit_size = slot->attr.bits;
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
status = psa_driver_wrapper_validate_key( &attributes,
|
|
data,
|
|
data_length,
|
|
&bit_size );
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
/* Key has been validated successfully by an accelerator.
|
|
* Copy key material into slot. */
|
|
status = psa_copy_key_material_into_slot( slot, data, data_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
slot->attr.bits = (psa_key_bits_t) bit_size;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
else if( status != PSA_ERROR_NOT_SUPPORTED )
|
|
return( status );
|
|
|
|
/* Key format is not supported by any accelerator, try software fallback
|
|
* if present. */
|
|
#if defined(MBEDTLS_ECP_C)
|
|
if( PSA_KEY_TYPE_IS_ECC( slot->attr.type ) )
|
|
{
|
|
return( psa_import_ecp_key( slot, data, data_length ) );
|
|
}
|
|
#endif /* defined(MBEDTLS_ECP_C) */
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
|
|
{
|
|
return( psa_import_rsa_key( slot, data, data_length ) );
|
|
}
|
|
#endif /* defined(MBEDTLS_RSA_C) */
|
|
|
|
/* Fell through the fallback as well, so have nothing else to try. */
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
else
|
|
{
|
|
/* Unknown key type */
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
}
|
|
|
|
/** Calculate the intersection of two algorithm usage policies.
|
|
*
|
|
* Return 0 (which allows no operation) on incompatibility.
|
|
*/
|
|
static psa_algorithm_t psa_key_policy_algorithm_intersection(
|
|
psa_algorithm_t alg1,
|
|
psa_algorithm_t alg2 )
|
|
{
|
|
/* Common case: both sides actually specify the same policy. */
|
|
if( alg1 == alg2 )
|
|
return( alg1 );
|
|
/* If the policies are from the same hash-and-sign family, check
|
|
* if one is a wildcard. If so the other has the specific algorithm. */
|
|
if( PSA_ALG_IS_HASH_AND_SIGN( alg1 ) &&
|
|
PSA_ALG_IS_HASH_AND_SIGN( alg2 ) &&
|
|
( alg1 & ~PSA_ALG_HASH_MASK ) == ( alg2 & ~PSA_ALG_HASH_MASK ) )
|
|
{
|
|
if( PSA_ALG_SIGN_GET_HASH( alg1 ) == PSA_ALG_ANY_HASH )
|
|
return( alg2 );
|
|
if( PSA_ALG_SIGN_GET_HASH( alg2 ) == PSA_ALG_ANY_HASH )
|
|
return( alg1 );
|
|
}
|
|
/* If the policies are incompatible, allow nothing. */
|
|
return( 0 );
|
|
}
|
|
|
|
static int psa_key_algorithm_permits( psa_algorithm_t policy_alg,
|
|
psa_algorithm_t requested_alg )
|
|
{
|
|
/* Common case: the policy only allows requested_alg. */
|
|
if( requested_alg == policy_alg )
|
|
return( 1 );
|
|
/* If policy_alg is a hash-and-sign with a wildcard for the hash,
|
|
* and requested_alg is the same hash-and-sign family with any hash,
|
|
* then requested_alg is compliant with policy_alg. */
|
|
if( PSA_ALG_IS_HASH_AND_SIGN( requested_alg ) &&
|
|
PSA_ALG_SIGN_GET_HASH( policy_alg ) == PSA_ALG_ANY_HASH )
|
|
{
|
|
return( ( policy_alg & ~PSA_ALG_HASH_MASK ) ==
|
|
( requested_alg & ~PSA_ALG_HASH_MASK ) );
|
|
}
|
|
/* If policy_alg is a generic key agreement operation, then using it for
|
|
* a key derivation with that key agreement should also be allowed. This
|
|
* behaviour is expected to be defined in a future specification version. */
|
|
if( PSA_ALG_IS_RAW_KEY_AGREEMENT( policy_alg ) &&
|
|
PSA_ALG_IS_KEY_AGREEMENT( requested_alg ) )
|
|
{
|
|
return( PSA_ALG_KEY_AGREEMENT_GET_BASE( requested_alg ) ==
|
|
policy_alg );
|
|
}
|
|
/* If it isn't permitted, it's forbidden. */
|
|
return( 0 );
|
|
}
|
|
|
|
/** Test whether a policy permits an algorithm.
|
|
*
|
|
* The caller must test usage flags separately.
|
|
*/
|
|
static int psa_key_policy_permits( const psa_key_policy_t *policy,
|
|
psa_algorithm_t alg )
|
|
{
|
|
return( psa_key_algorithm_permits( policy->alg, alg ) ||
|
|
psa_key_algorithm_permits( policy->alg2, alg ) );
|
|
}
|
|
|
|
/** Restrict a key policy based on a constraint.
|
|
*
|
|
* \param[in,out] policy The policy to restrict.
|
|
* \param[in] constraint The policy constraint to apply.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* \c *policy contains the intersection of the original value of
|
|
* \c *policy and \c *constraint.
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
* \c *policy and \c *constraint are incompatible.
|
|
* \c *policy is unchanged.
|
|
*/
|
|
static psa_status_t psa_restrict_key_policy(
|
|
psa_key_policy_t *policy,
|
|
const psa_key_policy_t *constraint )
|
|
{
|
|
psa_algorithm_t intersection_alg =
|
|
psa_key_policy_algorithm_intersection( policy->alg, constraint->alg );
|
|
psa_algorithm_t intersection_alg2 =
|
|
psa_key_policy_algorithm_intersection( policy->alg2, constraint->alg2 );
|
|
if( intersection_alg == 0 && policy->alg != 0 && constraint->alg != 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
if( intersection_alg2 == 0 && policy->alg2 != 0 && constraint->alg2 != 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
policy->usage &= constraint->usage;
|
|
policy->alg = intersection_alg;
|
|
policy->alg2 = intersection_alg2;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/** Retrieve a slot which must contain a key. The key must have allow all the
|
|
* usage flags set in \p usage. If \p alg is nonzero, the key must allow
|
|
* operations with this algorithm. */
|
|
static psa_status_t psa_get_key_from_slot( mbedtls_svc_key_id_t key,
|
|
psa_key_slot_t **p_slot,
|
|
psa_key_usage_t usage,
|
|
psa_algorithm_t alg )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_slot_t *slot = NULL;
|
|
|
|
*p_slot = NULL;
|
|
|
|
status = psa_get_key_slot( key, &slot );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
/* Enforce that usage policy for the key slot contains all the flags
|
|
* required by the usage parameter. There is one exception: public
|
|
* keys can always be exported, so we treat public key objects as
|
|
* if they had the export flag. */
|
|
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->attr.type ) )
|
|
usage &= ~PSA_KEY_USAGE_EXPORT;
|
|
if( ( slot->attr.policy.usage & usage ) != usage )
|
|
return( PSA_ERROR_NOT_PERMITTED );
|
|
|
|
/* Enforce that the usage policy permits the requested algortihm. */
|
|
if( alg != 0 && ! psa_key_policy_permits( &slot->attr.policy, alg ) )
|
|
return( PSA_ERROR_NOT_PERMITTED );
|
|
|
|
*p_slot = slot;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/** Retrieve a slot which must contain a transparent key.
|
|
*
|
|
* A transparent key is a key for which the key material is directly
|
|
* available, as opposed to a key in a secure element.
|
|
*
|
|
* This is a temporary function to use instead of psa_get_key_from_slot()
|
|
* until secure element support is fully implemented.
|
|
*/
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
static psa_status_t psa_get_transparent_key( mbedtls_svc_key_id_t key,
|
|
psa_key_slot_t **p_slot,
|
|
psa_key_usage_t usage,
|
|
psa_algorithm_t alg )
|
|
{
|
|
psa_status_t status = psa_get_key_from_slot( key, p_slot, usage, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
if( psa_key_slot_is_external( *p_slot ) )
|
|
{
|
|
*p_slot = NULL;
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
return( PSA_SUCCESS );
|
|
}
|
|
#else /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
/* With no secure element support, all keys are transparent. */
|
|
#define psa_get_transparent_key( key, p_slot, usage, alg ) \
|
|
psa_get_key_from_slot( key, p_slot, usage, alg )
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
/** Wipe key data from a slot. Preserve metadata such as the policy. */
|
|
static psa_status_t psa_remove_key_data_from_memory( psa_key_slot_t *slot )
|
|
{
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
if( psa_key_slot_is_external( slot ) )
|
|
{
|
|
/* No key material to clean. */
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
{
|
|
/* Data pointer will always be either a valid pointer or NULL in an
|
|
* initialized slot, so we can just free it. */
|
|
if( slot->data.key.data != NULL )
|
|
mbedtls_platform_zeroize( slot->data.key.data, slot->data.key.bytes);
|
|
mbedtls_free( slot->data.key.data );
|
|
slot->data.key.data = NULL;
|
|
slot->data.key.bytes = 0;
|
|
}
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/** Completely wipe a slot in memory, including its policy.
|
|
* Persistent storage is not affected. */
|
|
psa_status_t psa_wipe_key_slot( psa_key_slot_t *slot )
|
|
{
|
|
psa_status_t status = psa_remove_key_data_from_memory( slot );
|
|
/* Multipart operations may still be using the key. This is safe
|
|
* because all multipart operation objects are independent from
|
|
* the key slot: if they need to access the key after the setup
|
|
* phase, they have a copy of the key. Note that this means that
|
|
* key material can linger until all operations are completed. */
|
|
/* At this point, key material and other type-specific content has
|
|
* been wiped. Clear remaining metadata. We can call memset and not
|
|
* zeroize because the metadata is not particularly sensitive. */
|
|
memset( slot, 0, sizeof( *slot ) );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_destroy_key( mbedtls_svc_key_id_t key )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status; /* status of the last operation */
|
|
psa_status_t overall_status = PSA_SUCCESS;
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
psa_se_drv_table_entry_t *driver;
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
if( mbedtls_svc_key_id_is_null( key ) )
|
|
return( PSA_SUCCESS );
|
|
|
|
status = psa_get_key_slot( key, &slot );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
driver = psa_get_se_driver_entry( slot->attr.lifetime );
|
|
if( driver != NULL )
|
|
{
|
|
/* For a key in a secure element, we need to do three things:
|
|
* remove the key file in internal storage, destroy the
|
|
* key inside the secure element, and update the driver's
|
|
* persistent data. Start a transaction that will encompass these
|
|
* three actions. */
|
|
psa_crypto_prepare_transaction( PSA_CRYPTO_TRANSACTION_DESTROY_KEY );
|
|
psa_crypto_transaction.key.lifetime = slot->attr.lifetime;
|
|
psa_crypto_transaction.key.slot = slot->data.se.slot_number;
|
|
psa_crypto_transaction.key.id = slot->attr.id;
|
|
status = psa_crypto_save_transaction( );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
(void) psa_crypto_stop_transaction( );
|
|
/* We should still try to destroy the key in the secure
|
|
* element and the key metadata in storage. This is especially
|
|
* important if the error is that the storage is full.
|
|
* But how to do it exactly without risking an inconsistent
|
|
* state after a reset?
|
|
* https://github.com/ARMmbed/mbed-crypto/issues/215
|
|
*/
|
|
overall_status = status;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_destroy_se_key( driver, slot->data.se.slot_number );
|
|
if( overall_status == PSA_SUCCESS )
|
|
overall_status = status;
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
|
|
if( ! PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) )
|
|
{
|
|
status = psa_destroy_persistent_key( slot->attr.id );
|
|
if( overall_status == PSA_SUCCESS )
|
|
overall_status = status;
|
|
|
|
/* TODO: other slots may have a copy of the same key. We should
|
|
* invalidate them.
|
|
* https://github.com/ARMmbed/mbed-crypto/issues/214
|
|
*/
|
|
}
|
|
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
if( driver != NULL )
|
|
{
|
|
status = psa_save_se_persistent_data( driver );
|
|
if( overall_status == PSA_SUCCESS )
|
|
overall_status = status;
|
|
status = psa_crypto_stop_transaction( );
|
|
if( overall_status == PSA_SUCCESS )
|
|
overall_status = status;
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
exit:
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
status = psa_wipe_key_slot( slot );
|
|
/* Prioritize CORRUPTION_DETECTED from wiping over a storage error */
|
|
if( overall_status == PSA_SUCCESS )
|
|
overall_status = status;
|
|
return( overall_status );
|
|
}
|
|
|
|
void psa_reset_key_attributes( psa_key_attributes_t *attributes )
|
|
{
|
|
mbedtls_free( attributes->domain_parameters );
|
|
memset( attributes, 0, sizeof( *attributes ) );
|
|
}
|
|
|
|
psa_status_t psa_set_key_domain_parameters( psa_key_attributes_t *attributes,
|
|
psa_key_type_t type,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
uint8_t *copy = NULL;
|
|
|
|
if( data_length != 0 )
|
|
{
|
|
copy = mbedtls_calloc( 1, data_length );
|
|
if( copy == NULL )
|
|
return( PSA_ERROR_INSUFFICIENT_MEMORY );
|
|
memcpy( copy, data, data_length );
|
|
}
|
|
/* After this point, this function is guaranteed to succeed, so it
|
|
* can start modifying `*attributes`. */
|
|
|
|
if( attributes->domain_parameters != NULL )
|
|
{
|
|
mbedtls_free( attributes->domain_parameters );
|
|
attributes->domain_parameters = NULL;
|
|
attributes->domain_parameters_size = 0;
|
|
}
|
|
|
|
attributes->domain_parameters = copy;
|
|
attributes->domain_parameters_size = data_length;
|
|
attributes->core.type = type;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_get_key_domain_parameters(
|
|
const psa_key_attributes_t *attributes,
|
|
uint8_t *data, size_t data_size, size_t *data_length )
|
|
{
|
|
if( attributes->domain_parameters_size > data_size )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
*data_length = attributes->domain_parameters_size;
|
|
if( attributes->domain_parameters_size != 0 )
|
|
memcpy( data, attributes->domain_parameters,
|
|
attributes->domain_parameters_size );
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
static psa_status_t psa_get_rsa_public_exponent(
|
|
const mbedtls_rsa_context *rsa,
|
|
psa_key_attributes_t *attributes )
|
|
{
|
|
mbedtls_mpi mpi;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
uint8_t *buffer = NULL;
|
|
size_t buflen;
|
|
mbedtls_mpi_init( &mpi );
|
|
|
|
ret = mbedtls_rsa_export( rsa, NULL, NULL, NULL, NULL, &mpi );
|
|
if( ret != 0 )
|
|
goto exit;
|
|
if( mbedtls_mpi_cmp_int( &mpi, 65537 ) == 0 )
|
|
{
|
|
/* It's the default value, which is reported as an empty string,
|
|
* so there's nothing to do. */
|
|
goto exit;
|
|
}
|
|
|
|
buflen = mbedtls_mpi_size( &mpi );
|
|
buffer = mbedtls_calloc( 1, buflen );
|
|
if( buffer == NULL )
|
|
{
|
|
ret = MBEDTLS_ERR_MPI_ALLOC_FAILED;
|
|
goto exit;
|
|
}
|
|
ret = mbedtls_mpi_write_binary( &mpi, buffer, buflen );
|
|
if( ret != 0 )
|
|
goto exit;
|
|
attributes->domain_parameters = buffer;
|
|
attributes->domain_parameters_size = buflen;
|
|
|
|
exit:
|
|
mbedtls_mpi_free( &mpi );
|
|
if( ret != 0 )
|
|
mbedtls_free( buffer );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
/** Retrieve all the publicly-accessible attributes of a key.
|
|
*/
|
|
psa_status_t psa_get_key_attributes( mbedtls_svc_key_id_t key,
|
|
psa_key_attributes_t *attributes )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
|
|
psa_reset_key_attributes( attributes );
|
|
|
|
status = psa_get_key_from_slot( key, &slot, 0, 0 );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
attributes->core = slot->attr;
|
|
attributes->core.flags &= ( MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY |
|
|
MBEDTLS_PSA_KA_MASK_DUAL_USE );
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
if( psa_key_slot_is_external( slot ) )
|
|
psa_set_key_slot_number( attributes, slot->data.se.slot_number );
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
switch( slot->attr.type )
|
|
{
|
|
#if defined(MBEDTLS_RSA_C)
|
|
case PSA_KEY_TYPE_RSA_KEY_PAIR:
|
|
case PSA_KEY_TYPE_RSA_PUBLIC_KEY:
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
/* TODO: reporting the public exponent for opaque keys
|
|
* is not yet implemented.
|
|
* https://github.com/ARMmbed/mbed-crypto/issues/216
|
|
*/
|
|
if( psa_key_slot_is_external( slot ) )
|
|
break;
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
{
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
|
|
status = psa_load_rsa_representation( slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&rsa );
|
|
if( status != PSA_SUCCESS )
|
|
break;
|
|
|
|
status = psa_get_rsa_public_exponent( rsa,
|
|
attributes );
|
|
mbedtls_rsa_free( rsa );
|
|
mbedtls_free( rsa );
|
|
}
|
|
break;
|
|
#endif /* MBEDTLS_RSA_C */
|
|
default:
|
|
/* Nothing else to do. */
|
|
break;
|
|
}
|
|
|
|
if( status != PSA_SUCCESS )
|
|
psa_reset_key_attributes( attributes );
|
|
return( status );
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
psa_status_t psa_get_key_slot_number(
|
|
const psa_key_attributes_t *attributes,
|
|
psa_key_slot_number_t *slot_number )
|
|
{
|
|
if( attributes->core.flags & MBEDTLS_PSA_KA_FLAG_HAS_SLOT_NUMBER )
|
|
{
|
|
*slot_number = attributes->slot_number;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
else
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
static psa_status_t psa_internal_export_key_buffer( const psa_key_slot_t *slot,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length )
|
|
{
|
|
if( slot->data.key.bytes > data_size )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
memcpy( data, slot->data.key.data, slot->data.key.bytes );
|
|
memset( data + slot->data.key.bytes, 0,
|
|
data_size - slot->data.key.bytes );
|
|
*data_length = slot->data.key.bytes;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
static psa_status_t psa_internal_export_key( const psa_key_slot_t *slot,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length,
|
|
int export_public_key )
|
|
{
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
const psa_drv_se_t *drv;
|
|
psa_drv_se_context_t *drv_context;
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
*data_length = 0;
|
|
|
|
if( export_public_key && ! PSA_KEY_TYPE_IS_ASYMMETRIC( slot->attr.type ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
/* Reject a zero-length output buffer now, since this can never be a
|
|
* valid key representation. This way we know that data must be a valid
|
|
* pointer and we can do things like memset(data, ..., data_size). */
|
|
if( data_size == 0 )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
if( psa_get_se_driver( slot->attr.lifetime, &drv, &drv_context ) )
|
|
{
|
|
psa_drv_se_export_key_t method;
|
|
if( drv->key_management == NULL )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
method = ( export_public_key ?
|
|
drv->key_management->p_export_public :
|
|
drv->key_management->p_export );
|
|
if( method == NULL )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
return( method( drv_context,
|
|
slot->data.se.slot_number,
|
|
data, data_size, data_length ) );
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
if( key_type_is_raw_bytes( slot->attr.type ) )
|
|
{
|
|
return( psa_internal_export_key_buffer( slot, data, data_size, data_length ) );
|
|
}
|
|
else if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) ||
|
|
PSA_KEY_TYPE_IS_ECC( slot->attr.type ) )
|
|
{
|
|
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->attr.type ) )
|
|
{
|
|
/* Exporting public -> public */
|
|
return( psa_internal_export_key_buffer( slot, data, data_size, data_length ) );
|
|
}
|
|
else if( !export_public_key )
|
|
{
|
|
/* Exporting private -> private */
|
|
return( psa_internal_export_key_buffer( slot, data, data_size, data_length ) );
|
|
}
|
|
/* Need to export the public part of a private key,
|
|
* so conversion is needed */
|
|
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
|
|
{
|
|
#if defined(MBEDTLS_RSA_C)
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
psa_status_t status = psa_load_rsa_representation(
|
|
slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&rsa );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
status = psa_export_rsa_key( PSA_KEY_TYPE_RSA_PUBLIC_KEY,
|
|
rsa,
|
|
data,
|
|
data_size,
|
|
data_length );
|
|
|
|
mbedtls_rsa_free( rsa );
|
|
mbedtls_free( rsa );
|
|
|
|
return( status );
|
|
#else
|
|
/* We don't know how to convert a private RSA key to public. */
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
#if defined(MBEDTLS_ECP_C)
|
|
mbedtls_ecp_keypair *ecp = NULL;
|
|
psa_status_t status = psa_load_ecp_representation(
|
|
slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&ecp );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
status = psa_export_ecp_key( PSA_KEY_TYPE_ECC_PUBLIC_KEY(
|
|
PSA_KEY_TYPE_ECC_GET_FAMILY(
|
|
slot->attr.type ) ),
|
|
ecp,
|
|
data,
|
|
data_size,
|
|
data_length );
|
|
|
|
mbedtls_ecp_keypair_free( ecp );
|
|
mbedtls_free( ecp );
|
|
return( status );
|
|
#else
|
|
/* We don't know how to convert a private ECC key to public */
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* This shouldn't happen in the reference implementation, but
|
|
it is valid for a special-purpose implementation to omit
|
|
support for exporting certain key types. */
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
}
|
|
|
|
psa_status_t psa_export_key( mbedtls_svc_key_id_t key,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
|
|
/* Set the key to empty now, so that even when there are errors, we always
|
|
* set data_length to a value between 0 and data_size. On error, setting
|
|
* the key to empty is a good choice because an empty key representation is
|
|
* unlikely to be accepted anywhere. */
|
|
*data_length = 0;
|
|
|
|
/* Export requires the EXPORT flag. There is an exception for public keys,
|
|
* which don't require any flag, but psa_get_key_from_slot takes
|
|
* care of this. */
|
|
status = psa_get_key_from_slot( key, &slot, PSA_KEY_USAGE_EXPORT, 0 );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
return( psa_internal_export_key( slot, data, data_size,
|
|
data_length, 0 ) );
|
|
}
|
|
|
|
psa_status_t psa_export_public_key( mbedtls_svc_key_id_t key,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
|
|
/* Set the key to empty now, so that even when there are errors, we always
|
|
* set data_length to a value between 0 and data_size. On error, setting
|
|
* the key to empty is a good choice because an empty key representation is
|
|
* unlikely to be accepted anywhere. */
|
|
*data_length = 0;
|
|
|
|
/* Exporting a public key doesn't require a usage flag. */
|
|
status = psa_get_key_from_slot( key, &slot, 0, 0 );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
return( psa_internal_export_key( slot, data, data_size,
|
|
data_length, 1 ) );
|
|
}
|
|
|
|
#if defined(static_assert)
|
|
static_assert( ( MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY & MBEDTLS_PSA_KA_MASK_DUAL_USE ) == 0,
|
|
"One or more key attribute flag is listed as both external-only and dual-use" );
|
|
static_assert( ( PSA_KA_MASK_INTERNAL_ONLY & MBEDTLS_PSA_KA_MASK_DUAL_USE ) == 0,
|
|
"One or more key attribute flag is listed as both internal-only and dual-use" );
|
|
static_assert( ( PSA_KA_MASK_INTERNAL_ONLY & MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY ) == 0,
|
|
"One or more key attribute flag is listed as both internal-only and external-only" );
|
|
#endif
|
|
|
|
/** Validate that a key policy is internally well-formed.
|
|
*
|
|
* This function only rejects invalid policies. It does not validate the
|
|
* consistency of the policy with respect to other attributes of the key
|
|
* such as the key type.
|
|
*/
|
|
static psa_status_t psa_validate_key_policy( const psa_key_policy_t *policy )
|
|
{
|
|
if( ( policy->usage & ~( PSA_KEY_USAGE_EXPORT |
|
|
PSA_KEY_USAGE_COPY |
|
|
PSA_KEY_USAGE_ENCRYPT |
|
|
PSA_KEY_USAGE_DECRYPT |
|
|
PSA_KEY_USAGE_SIGN_HASH |
|
|
PSA_KEY_USAGE_VERIFY_HASH |
|
|
PSA_KEY_USAGE_DERIVE ) ) != 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/** Validate the internal consistency of key attributes.
|
|
*
|
|
* This function only rejects invalid attribute values. If does not
|
|
* validate the consistency of the attributes with any key data that may
|
|
* be involved in the creation of the key.
|
|
*
|
|
* Call this function early in the key creation process.
|
|
*
|
|
* \param[in] attributes Key attributes for the new key.
|
|
* \param[out] p_drv On any return, the driver for the key, if any.
|
|
* NULL for a transparent key.
|
|
*
|
|
*/
|
|
static psa_status_t psa_validate_key_attributes(
|
|
const psa_key_attributes_t *attributes,
|
|
psa_se_drv_table_entry_t **p_drv )
|
|
{
|
|
psa_status_t status = PSA_ERROR_INVALID_ARGUMENT;
|
|
psa_key_lifetime_t lifetime = psa_get_key_lifetime( attributes );
|
|
mbedtls_svc_key_id_t key = psa_get_key_id( attributes );
|
|
|
|
status = psa_validate_key_location( lifetime, p_drv );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
status = psa_validate_key_persistence( lifetime );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
if ( PSA_KEY_LIFETIME_IS_VOLATILE( lifetime ) )
|
|
{
|
|
if( MBEDTLS_SVC_KEY_ID_GET_KEY_ID( key ) != 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
else
|
|
{
|
|
status = psa_validate_key_id( psa_get_key_id( attributes ), 0, 0 );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
}
|
|
|
|
status = psa_validate_key_policy( &attributes->core.policy );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
/* Refuse to create overly large keys.
|
|
* Note that this doesn't trigger on import if the attributes don't
|
|
* explicitly specify a size (so psa_get_key_bits returns 0), so
|
|
* psa_import_key() needs its own checks. */
|
|
if( psa_get_key_bits( attributes ) > PSA_MAX_KEY_BITS )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
/* Reject invalid flags. These should not be reachable through the API. */
|
|
if( attributes->core.flags & ~ ( MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY |
|
|
MBEDTLS_PSA_KA_MASK_DUAL_USE ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/** Prepare a key slot to receive key material.
|
|
*
|
|
* This function allocates a key slot and sets its metadata.
|
|
*
|
|
* If this function fails, call psa_fail_key_creation().
|
|
*
|
|
* This function is intended to be used as follows:
|
|
* -# Call psa_start_key_creation() to allocate a key slot, prepare
|
|
* it with the specified attributes, and in case of a volatile key assign it
|
|
* a volatile key identifier.
|
|
* -# Populate the slot with the key material.
|
|
* -# Call psa_finish_key_creation() to finalize the creation of the slot.
|
|
* In case of failure at any step, stop the sequence and call
|
|
* psa_fail_key_creation().
|
|
*
|
|
* \param method An identification of the calling function.
|
|
* \param[in] attributes Key attributes for the new key.
|
|
* \param[out] key On success, identifier of the key. Note that the
|
|
* key identifier is also stored in the prepared
|
|
* slot.
|
|
* \param[out] p_slot On success, a pointer to the prepared slot.
|
|
* \param[out] p_drv On any return, the driver for the key, if any.
|
|
* NULL for a transparent key.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* The key slot is ready to receive key material.
|
|
* \return If this function fails, the key slot is an invalid state.
|
|
* You must call psa_fail_key_creation() to wipe and free the slot.
|
|
*/
|
|
static psa_status_t psa_start_key_creation(
|
|
psa_key_creation_method_t method,
|
|
const psa_key_attributes_t *attributes,
|
|
mbedtls_svc_key_id_t *key,
|
|
psa_key_slot_t **p_slot,
|
|
psa_se_drv_table_entry_t **p_drv )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_id_t volatile_key_id;
|
|
psa_key_slot_t *slot;
|
|
|
|
(void) method;
|
|
*p_drv = NULL;
|
|
|
|
status = psa_validate_key_attributes( attributes, p_drv );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
status = psa_get_empty_key_slot( &volatile_key_id, p_slot );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
slot = *p_slot;
|
|
|
|
/* We're storing the declared bit-size of the key. It's up to each
|
|
* creation mechanism to verify that this information is correct.
|
|
* It's automatically correct for mechanisms that use the bit-size as
|
|
* an input (generate, device) but not for those where the bit-size
|
|
* is optional (import, copy). In case of a volatile key, assign it the
|
|
* volatile key identifier associated to the slot returned to contain its
|
|
* definition. */
|
|
|
|
slot->attr = attributes->core;
|
|
if( PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) )
|
|
{
|
|
#if !defined(MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER)
|
|
slot->attr.id = volatile_key_id;
|
|
#else
|
|
slot->attr.id.key_id = volatile_key_id;
|
|
#endif
|
|
}
|
|
|
|
/* Erase external-only flags from the internal copy. To access
|
|
* external-only flags, query `attributes`. Thanks to the check
|
|
* in psa_validate_key_attributes(), this leaves the dual-use
|
|
* flags and any internal flag that psa_get_empty_key_slot()
|
|
* may have set. */
|
|
slot->attr.flags &= ~MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY;
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
/* For a key in a secure element, we need to do three things
|
|
* when creating or registering a persistent key:
|
|
* create the key file in internal storage, create the
|
|
* key inside the secure element, and update the driver's
|
|
* persistent data. This is done by starting a transaction that will
|
|
* encompass these three actions.
|
|
* For registering a volatile key, we just need to find an appropriate
|
|
* slot number inside the SE. Since the key is designated volatile, creating
|
|
* a transaction is not required. */
|
|
/* The first thing to do is to find a slot number for the new key.
|
|
* We save the slot number in persistent storage as part of the
|
|
* transaction data. It will be needed to recover if the power
|
|
* fails during the key creation process, to clean up on the secure
|
|
* element side after restarting. Obtaining a slot number from the
|
|
* secure element driver updates its persistent state, but we do not yet
|
|
* save the driver's persistent state, so that if the power fails,
|
|
* we can roll back to a state where the key doesn't exist. */
|
|
if( *p_drv != NULL )
|
|
{
|
|
status = psa_find_se_slot_for_key( attributes, method, *p_drv,
|
|
&slot->data.se.slot_number );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
if( ! PSA_KEY_LIFETIME_IS_VOLATILE( attributes->core.lifetime ) )
|
|
{
|
|
psa_crypto_prepare_transaction( PSA_CRYPTO_TRANSACTION_CREATE_KEY );
|
|
psa_crypto_transaction.key.lifetime = slot->attr.lifetime;
|
|
psa_crypto_transaction.key.slot = slot->data.se.slot_number;
|
|
psa_crypto_transaction.key.id = slot->attr.id;
|
|
status = psa_crypto_save_transaction( );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
(void) psa_crypto_stop_transaction( );
|
|
return( status );
|
|
}
|
|
}
|
|
}
|
|
|
|
if( *p_drv == NULL && method == PSA_KEY_CREATION_REGISTER )
|
|
{
|
|
/* Key registration only makes sense with a secure element. */
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
*key = slot->attr.id;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/** Finalize the creation of a key once its key material has been set.
|
|
*
|
|
* This entails writing the key to persistent storage.
|
|
*
|
|
* If this function fails, call psa_fail_key_creation().
|
|
* See the documentation of psa_start_key_creation() for the intended use
|
|
* of this function.
|
|
*
|
|
* \param[in,out] slot Pointer to the slot with key material.
|
|
* \param[in] driver The secure element driver for the key,
|
|
* or NULL for a transparent key.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* The key was successfully created.
|
|
* \return If this function fails, the key slot is an invalid state.
|
|
* You must call psa_fail_key_creation() to wipe and free the slot.
|
|
*/
|
|
static psa_status_t psa_finish_key_creation(
|
|
psa_key_slot_t *slot,
|
|
psa_se_drv_table_entry_t *driver )
|
|
{
|
|
psa_status_t status = PSA_SUCCESS;
|
|
(void) slot;
|
|
(void) driver;
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
|
|
if( ! PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
if( driver != NULL )
|
|
{
|
|
psa_se_key_data_storage_t data;
|
|
#if defined(static_assert)
|
|
static_assert( sizeof( slot->data.se.slot_number ) ==
|
|
sizeof( data.slot_number ),
|
|
"Slot number size does not match psa_se_key_data_storage_t" );
|
|
#endif
|
|
memcpy( &data.slot_number, &slot->data.se.slot_number,
|
|
sizeof( slot->data.se.slot_number ) );
|
|
status = psa_save_persistent_key( &slot->attr,
|
|
(uint8_t*) &data,
|
|
sizeof( data ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
{
|
|
/* Key material is saved in export representation in the slot, so
|
|
* just pass the slot buffer for storage. */
|
|
status = psa_save_persistent_key( &slot->attr,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes );
|
|
}
|
|
}
|
|
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
/* Finish the transaction for a key creation. This does not
|
|
* happen when registering an existing key. Detect this case
|
|
* by checking whether a transaction is in progress (actual
|
|
* creation of a persistent key in a secure element requires a transaction,
|
|
* but registration or volatile key creation doesn't use one). */
|
|
if( driver != NULL &&
|
|
psa_crypto_transaction.unknown.type == PSA_CRYPTO_TRANSACTION_CREATE_KEY )
|
|
{
|
|
status = psa_save_se_persistent_data( driver );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
psa_destroy_persistent_key( slot->attr.id );
|
|
return( status );
|
|
}
|
|
status = psa_crypto_stop_transaction( );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
return( status );
|
|
}
|
|
|
|
/** Abort the creation of a key.
|
|
*
|
|
* You may call this function after calling psa_start_key_creation(),
|
|
* or after psa_finish_key_creation() fails. In other circumstances, this
|
|
* function may not clean up persistent storage.
|
|
* See the documentation of psa_start_key_creation() for the intended use
|
|
* of this function.
|
|
*
|
|
* \param[in,out] slot Pointer to the slot with key material.
|
|
* \param[in] driver The secure element driver for the key,
|
|
* or NULL for a transparent key.
|
|
*/
|
|
static void psa_fail_key_creation( psa_key_slot_t *slot,
|
|
psa_se_drv_table_entry_t *driver )
|
|
{
|
|
(void) driver;
|
|
|
|
if( slot == NULL )
|
|
return;
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
/* TODO: If the key has already been created in the secure
|
|
* element, and the failure happened later (when saving metadata
|
|
* to internal storage), we need to destroy the key in the secure
|
|
* element.
|
|
* https://github.com/ARMmbed/mbed-crypto/issues/217
|
|
*/
|
|
|
|
/* Abort the ongoing transaction if any (there may not be one if
|
|
* the creation process failed before starting one, or if the
|
|
* key creation is a registration of a key in a secure element).
|
|
* Earlier functions must already have done what it takes to undo any
|
|
* partial creation. All that's left is to update the transaction data
|
|
* itself. */
|
|
(void) psa_crypto_stop_transaction( );
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
psa_wipe_key_slot( slot );
|
|
}
|
|
|
|
/** Validate optional attributes during key creation.
|
|
*
|
|
* Some key attributes are optional during key creation. If they are
|
|
* specified in the attributes structure, check that they are consistent
|
|
* with the data in the slot.
|
|
*
|
|
* This function should be called near the end of key creation, after
|
|
* the slot in memory is fully populated but before saving persistent data.
|
|
*/
|
|
static psa_status_t psa_validate_optional_attributes(
|
|
const psa_key_slot_t *slot,
|
|
const psa_key_attributes_t *attributes )
|
|
{
|
|
if( attributes->core.type != 0 )
|
|
{
|
|
if( attributes->core.type != slot->attr.type )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
|
|
if( attributes->domain_parameters_size != 0 )
|
|
{
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
|
|
{
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
mbedtls_mpi actual, required;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
psa_status_t status = psa_load_rsa_representation(
|
|
slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&rsa );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
mbedtls_mpi_init( &actual );
|
|
mbedtls_mpi_init( &required );
|
|
ret = mbedtls_rsa_export( rsa,
|
|
NULL, NULL, NULL, NULL, &actual );
|
|
mbedtls_rsa_free( rsa );
|
|
mbedtls_free( rsa );
|
|
if( ret != 0 )
|
|
goto rsa_exit;
|
|
ret = mbedtls_mpi_read_binary( &required,
|
|
attributes->domain_parameters,
|
|
attributes->domain_parameters_size );
|
|
if( ret != 0 )
|
|
goto rsa_exit;
|
|
if( mbedtls_mpi_cmp_mpi( &actual, &required ) != 0 )
|
|
ret = MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
|
|
rsa_exit:
|
|
mbedtls_mpi_free( &actual );
|
|
mbedtls_mpi_free( &required );
|
|
if( ret != 0)
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
}
|
|
|
|
if( attributes->core.bits != 0 )
|
|
{
|
|
if( attributes->core.bits != slot->attr.bits )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_import_key( const psa_key_attributes_t *attributes,
|
|
const uint8_t *data,
|
|
size_t data_length,
|
|
mbedtls_svc_key_id_t *key )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_slot_t *slot = NULL;
|
|
psa_se_drv_table_entry_t *driver = NULL;
|
|
|
|
/* Reject zero-length symmetric keys (including raw data key objects).
|
|
* This also rejects any key which might be encoded as an empty string,
|
|
* which is never valid. */
|
|
if( data_length == 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
status = psa_start_key_creation( PSA_KEY_CREATION_IMPORT, attributes,
|
|
key, &slot, &driver );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
if( driver != NULL )
|
|
{
|
|
const psa_drv_se_t *drv = psa_get_se_driver_methods( driver );
|
|
/* The driver should set the number of key bits, however in
|
|
* case it doesn't, we initialize bits to an invalid value. */
|
|
size_t bits = PSA_MAX_KEY_BITS + 1;
|
|
if( drv->key_management == NULL ||
|
|
drv->key_management->p_import == NULL )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
status = drv->key_management->p_import(
|
|
psa_get_se_driver_context( driver ),
|
|
slot->data.se.slot_number, attributes, data, data_length,
|
|
&bits );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
if( bits > PSA_MAX_KEY_BITS )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
slot->attr.bits = (psa_key_bits_t) bits;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
{
|
|
status = psa_import_key_into_slot( slot, data, data_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
}
|
|
status = psa_validate_optional_attributes( slot, attributes );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_finish_key_creation( slot, driver );
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
psa_fail_key_creation( slot, driver );
|
|
*key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
}
|
|
return( status );
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
psa_status_t mbedtls_psa_register_se_key(
|
|
const psa_key_attributes_t *attributes )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_slot_t *slot = NULL;
|
|
psa_se_drv_table_entry_t *driver = NULL;
|
|
mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
|
|
/* Leaving attributes unspecified is not currently supported.
|
|
* It could make sense to query the key type and size from the
|
|
* secure element, but not all secure elements support this
|
|
* and the driver HAL doesn't currently support it. */
|
|
if( psa_get_key_type( attributes ) == PSA_KEY_TYPE_NONE )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
if( psa_get_key_bits( attributes ) == 0 )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
status = psa_start_key_creation( PSA_KEY_CREATION_REGISTER, attributes,
|
|
&key, &slot, &driver );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_finish_key_creation( slot, driver );
|
|
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
psa_fail_key_creation( slot, driver );
|
|
}
|
|
/* Registration doesn't keep the key in RAM. */
|
|
psa_close_key( key );
|
|
return( status );
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
static psa_status_t psa_copy_key_material( const psa_key_slot_t *source,
|
|
psa_key_slot_t *target )
|
|
{
|
|
psa_status_t status = psa_copy_key_material_into_slot( target,
|
|
source->data.key.data,
|
|
source->data.key.bytes );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
target->attr.type = source->attr.type;
|
|
target->attr.bits = source->attr.bits;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_copy_key( mbedtls_svc_key_id_t source_key,
|
|
const psa_key_attributes_t *specified_attributes,
|
|
mbedtls_svc_key_id_t *target_key )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_slot_t *source_slot = NULL;
|
|
psa_key_slot_t *target_slot = NULL;
|
|
psa_key_attributes_t actual_attributes = *specified_attributes;
|
|
psa_se_drv_table_entry_t *driver = NULL;
|
|
|
|
status = psa_get_transparent_key( source_key, &source_slot,
|
|
PSA_KEY_USAGE_COPY, 0 );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_validate_optional_attributes( source_slot,
|
|
specified_attributes );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_restrict_key_policy( &actual_attributes.core.policy,
|
|
&source_slot->attr.policy );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_start_key_creation( PSA_KEY_CREATION_COPY,
|
|
&actual_attributes,
|
|
target_key, &target_slot, &driver );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
if( driver != NULL )
|
|
{
|
|
/* Copying to a secure element is not implemented yet. */
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
status = psa_copy_key_material( source_slot, target_slot );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_finish_key_creation( target_slot, driver );
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
psa_fail_key_creation( target_slot, driver );
|
|
*target_key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
}
|
|
return( status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Message digests */
|
|
/****************************************************************/
|
|
|
|
#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
|
|
static const mbedtls_md_info_t *mbedtls_md_info_from_psa( psa_algorithm_t alg )
|
|
{
|
|
switch( alg )
|
|
{
|
|
#if defined(MBEDTLS_MD2_C)
|
|
case PSA_ALG_MD2:
|
|
return( &mbedtls_md2_info );
|
|
#endif
|
|
#if defined(MBEDTLS_MD4_C)
|
|
case PSA_ALG_MD4:
|
|
return( &mbedtls_md4_info );
|
|
#endif
|
|
#if defined(MBEDTLS_MD5_C)
|
|
case PSA_ALG_MD5:
|
|
return( &mbedtls_md5_info );
|
|
#endif
|
|
#if defined(MBEDTLS_RIPEMD160_C)
|
|
case PSA_ALG_RIPEMD160:
|
|
return( &mbedtls_ripemd160_info );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C)
|
|
case PSA_ALG_SHA_1:
|
|
return( &mbedtls_sha1_info );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
case PSA_ALG_SHA_224:
|
|
return( &mbedtls_sha224_info );
|
|
case PSA_ALG_SHA_256:
|
|
return( &mbedtls_sha256_info );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
#if !defined(MBEDTLS_SHA512_NO_SHA384)
|
|
case PSA_ALG_SHA_384:
|
|
return( &mbedtls_sha384_info );
|
|
#endif
|
|
case PSA_ALG_SHA_512:
|
|
return( &mbedtls_sha512_info );
|
|
#endif
|
|
default:
|
|
return( NULL );
|
|
}
|
|
}
|
|
#endif /* defined(MBEDTLS_RSA_C) || defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
|
|
|
|
psa_status_t psa_hash_abort( psa_hash_operation_t *operation )
|
|
{
|
|
switch( operation->alg )
|
|
{
|
|
case 0:
|
|
/* The object has (apparently) been initialized but it is not
|
|
* in use. It's ok to call abort on such an object, and there's
|
|
* nothing to do. */
|
|
break;
|
|
#if defined(MBEDTLS_MD2_C)
|
|
case PSA_ALG_MD2:
|
|
mbedtls_md2_free( &operation->ctx.md2 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD4_C)
|
|
case PSA_ALG_MD4:
|
|
mbedtls_md4_free( &operation->ctx.md4 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD5_C)
|
|
case PSA_ALG_MD5:
|
|
mbedtls_md5_free( &operation->ctx.md5 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_RIPEMD160_C)
|
|
case PSA_ALG_RIPEMD160:
|
|
mbedtls_ripemd160_free( &operation->ctx.ripemd160 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C)
|
|
case PSA_ALG_SHA_1:
|
|
mbedtls_sha1_free( &operation->ctx.sha1 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
case PSA_ALG_SHA_224:
|
|
case PSA_ALG_SHA_256:
|
|
mbedtls_sha256_free( &operation->ctx.sha256 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
#if !defined(MBEDTLS_SHA512_NO_SHA384)
|
|
case PSA_ALG_SHA_384:
|
|
#endif
|
|
case PSA_ALG_SHA_512:
|
|
mbedtls_sha512_free( &operation->ctx.sha512 );
|
|
break;
|
|
#endif
|
|
default:
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
operation->alg = 0;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_hash_setup( psa_hash_operation_t *operation,
|
|
psa_algorithm_t alg )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
/* A context must be freshly initialized before it can be set up. */
|
|
if( operation->alg != 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
switch( alg )
|
|
{
|
|
#if defined(MBEDTLS_MD2_C)
|
|
case PSA_ALG_MD2:
|
|
mbedtls_md2_init( &operation->ctx.md2 );
|
|
ret = mbedtls_md2_starts_ret( &operation->ctx.md2 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD4_C)
|
|
case PSA_ALG_MD4:
|
|
mbedtls_md4_init( &operation->ctx.md4 );
|
|
ret = mbedtls_md4_starts_ret( &operation->ctx.md4 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD5_C)
|
|
case PSA_ALG_MD5:
|
|
mbedtls_md5_init( &operation->ctx.md5 );
|
|
ret = mbedtls_md5_starts_ret( &operation->ctx.md5 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_RIPEMD160_C)
|
|
case PSA_ALG_RIPEMD160:
|
|
mbedtls_ripemd160_init( &operation->ctx.ripemd160 );
|
|
ret = mbedtls_ripemd160_starts_ret( &operation->ctx.ripemd160 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C)
|
|
case PSA_ALG_SHA_1:
|
|
mbedtls_sha1_init( &operation->ctx.sha1 );
|
|
ret = mbedtls_sha1_starts_ret( &operation->ctx.sha1 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
case PSA_ALG_SHA_224:
|
|
mbedtls_sha256_init( &operation->ctx.sha256 );
|
|
ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 1 );
|
|
break;
|
|
case PSA_ALG_SHA_256:
|
|
mbedtls_sha256_init( &operation->ctx.sha256 );
|
|
ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 0 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
#if !defined(MBEDTLS_SHA512_NO_SHA384)
|
|
case PSA_ALG_SHA_384:
|
|
mbedtls_sha512_init( &operation->ctx.sha512 );
|
|
ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 1 );
|
|
break;
|
|
#endif
|
|
case PSA_ALG_SHA_512:
|
|
mbedtls_sha512_init( &operation->ctx.sha512 );
|
|
ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 0 );
|
|
break;
|
|
#endif
|
|
default:
|
|
return( PSA_ALG_IS_HASH( alg ) ?
|
|
PSA_ERROR_NOT_SUPPORTED :
|
|
PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
if( ret == 0 )
|
|
operation->alg = alg;
|
|
else
|
|
psa_hash_abort( operation );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
|
|
psa_status_t psa_hash_update( psa_hash_operation_t *operation,
|
|
const uint8_t *input,
|
|
size_t input_length )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
/* Don't require hash implementations to behave correctly on a
|
|
* zero-length input, which may have an invalid pointer. */
|
|
if( input_length == 0 )
|
|
return( PSA_SUCCESS );
|
|
|
|
switch( operation->alg )
|
|
{
|
|
#if defined(MBEDTLS_MD2_C)
|
|
case PSA_ALG_MD2:
|
|
ret = mbedtls_md2_update_ret( &operation->ctx.md2,
|
|
input, input_length );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD4_C)
|
|
case PSA_ALG_MD4:
|
|
ret = mbedtls_md4_update_ret( &operation->ctx.md4,
|
|
input, input_length );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD5_C)
|
|
case PSA_ALG_MD5:
|
|
ret = mbedtls_md5_update_ret( &operation->ctx.md5,
|
|
input, input_length );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_RIPEMD160_C)
|
|
case PSA_ALG_RIPEMD160:
|
|
ret = mbedtls_ripemd160_update_ret( &operation->ctx.ripemd160,
|
|
input, input_length );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C)
|
|
case PSA_ALG_SHA_1:
|
|
ret = mbedtls_sha1_update_ret( &operation->ctx.sha1,
|
|
input, input_length );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
case PSA_ALG_SHA_224:
|
|
case PSA_ALG_SHA_256:
|
|
ret = mbedtls_sha256_update_ret( &operation->ctx.sha256,
|
|
input, input_length );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
#if !defined(MBEDTLS_SHA512_NO_SHA384)
|
|
case PSA_ALG_SHA_384:
|
|
#endif
|
|
case PSA_ALG_SHA_512:
|
|
ret = mbedtls_sha512_update_ret( &operation->ctx.sha512,
|
|
input, input_length );
|
|
break;
|
|
#endif
|
|
default:
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( ret != 0 )
|
|
psa_hash_abort( operation );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
|
|
psa_status_t psa_hash_finish( psa_hash_operation_t *operation,
|
|
uint8_t *hash,
|
|
size_t hash_size,
|
|
size_t *hash_length )
|
|
{
|
|
psa_status_t status;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t actual_hash_length = PSA_HASH_SIZE( operation->alg );
|
|
|
|
/* Fill the output buffer with something that isn't a valid hash
|
|
* (barring an attack on the hash and deliberately-crafted input),
|
|
* in case the caller doesn't check the return status properly. */
|
|
*hash_length = hash_size;
|
|
/* If hash_size is 0 then hash may be NULL and then the
|
|
* call to memset would have undefined behavior. */
|
|
if( hash_size != 0 )
|
|
memset( hash, '!', hash_size );
|
|
|
|
if( hash_size < actual_hash_length )
|
|
{
|
|
status = PSA_ERROR_BUFFER_TOO_SMALL;
|
|
goto exit;
|
|
}
|
|
|
|
switch( operation->alg )
|
|
{
|
|
#if defined(MBEDTLS_MD2_C)
|
|
case PSA_ALG_MD2:
|
|
ret = mbedtls_md2_finish_ret( &operation->ctx.md2, hash );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD4_C)
|
|
case PSA_ALG_MD4:
|
|
ret = mbedtls_md4_finish_ret( &operation->ctx.md4, hash );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD5_C)
|
|
case PSA_ALG_MD5:
|
|
ret = mbedtls_md5_finish_ret( &operation->ctx.md5, hash );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_RIPEMD160_C)
|
|
case PSA_ALG_RIPEMD160:
|
|
ret = mbedtls_ripemd160_finish_ret( &operation->ctx.ripemd160, hash );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C)
|
|
case PSA_ALG_SHA_1:
|
|
ret = mbedtls_sha1_finish_ret( &operation->ctx.sha1, hash );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
case PSA_ALG_SHA_224:
|
|
case PSA_ALG_SHA_256:
|
|
ret = mbedtls_sha256_finish_ret( &operation->ctx.sha256, hash );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
#if !defined(MBEDTLS_SHA512_NO_SHA384)
|
|
case PSA_ALG_SHA_384:
|
|
#endif
|
|
case PSA_ALG_SHA_512:
|
|
ret = mbedtls_sha512_finish_ret( &operation->ctx.sha512, hash );
|
|
break;
|
|
#endif
|
|
default:
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
status = mbedtls_to_psa_error( ret );
|
|
|
|
exit:
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
*hash_length = actual_hash_length;
|
|
return( psa_hash_abort( operation ) );
|
|
}
|
|
else
|
|
{
|
|
psa_hash_abort( operation );
|
|
return( status );
|
|
}
|
|
}
|
|
|
|
psa_status_t psa_hash_verify( psa_hash_operation_t *operation,
|
|
const uint8_t *hash,
|
|
size_t hash_length )
|
|
{
|
|
uint8_t actual_hash[MBEDTLS_MD_MAX_SIZE];
|
|
size_t actual_hash_length;
|
|
psa_status_t status = psa_hash_finish( operation,
|
|
actual_hash, sizeof( actual_hash ),
|
|
&actual_hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
if( actual_hash_length != hash_length )
|
|
return( PSA_ERROR_INVALID_SIGNATURE );
|
|
if( safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 )
|
|
return( PSA_ERROR_INVALID_SIGNATURE );
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_hash_compute( psa_algorithm_t alg,
|
|
const uint8_t *input, size_t input_length,
|
|
uint8_t *hash, size_t hash_size,
|
|
size_t *hash_length )
|
|
{
|
|
psa_hash_operation_t operation = PSA_HASH_OPERATION_INIT;
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
*hash_length = hash_size;
|
|
status = psa_hash_setup( &operation, alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
status = psa_hash_update( &operation, input, input_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
status = psa_hash_finish( &operation, hash, hash_size, hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
exit:
|
|
if( status == PSA_SUCCESS )
|
|
status = psa_hash_abort( &operation );
|
|
else
|
|
psa_hash_abort( &operation );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_hash_compare( psa_algorithm_t alg,
|
|
const uint8_t *input, size_t input_length,
|
|
const uint8_t *hash, size_t hash_length )
|
|
{
|
|
psa_hash_operation_t operation = PSA_HASH_OPERATION_INIT;
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
status = psa_hash_setup( &operation, alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
status = psa_hash_update( &operation, input, input_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
status = psa_hash_verify( &operation, hash, hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
exit:
|
|
if( status == PSA_SUCCESS )
|
|
status = psa_hash_abort( &operation );
|
|
else
|
|
psa_hash_abort( &operation );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_hash_clone( const psa_hash_operation_t *source_operation,
|
|
psa_hash_operation_t *target_operation )
|
|
{
|
|
if( target_operation->alg != 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
switch( source_operation->alg )
|
|
{
|
|
case 0:
|
|
return( PSA_ERROR_BAD_STATE );
|
|
#if defined(MBEDTLS_MD2_C)
|
|
case PSA_ALG_MD2:
|
|
mbedtls_md2_clone( &target_operation->ctx.md2,
|
|
&source_operation->ctx.md2 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD4_C)
|
|
case PSA_ALG_MD4:
|
|
mbedtls_md4_clone( &target_operation->ctx.md4,
|
|
&source_operation->ctx.md4 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_MD5_C)
|
|
case PSA_ALG_MD5:
|
|
mbedtls_md5_clone( &target_operation->ctx.md5,
|
|
&source_operation->ctx.md5 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_RIPEMD160_C)
|
|
case PSA_ALG_RIPEMD160:
|
|
mbedtls_ripemd160_clone( &target_operation->ctx.ripemd160,
|
|
&source_operation->ctx.ripemd160 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C)
|
|
case PSA_ALG_SHA_1:
|
|
mbedtls_sha1_clone( &target_operation->ctx.sha1,
|
|
&source_operation->ctx.sha1 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
case PSA_ALG_SHA_224:
|
|
case PSA_ALG_SHA_256:
|
|
mbedtls_sha256_clone( &target_operation->ctx.sha256,
|
|
&source_operation->ctx.sha256 );
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
#if !defined(MBEDTLS_SHA512_NO_SHA384)
|
|
case PSA_ALG_SHA_384:
|
|
#endif
|
|
case PSA_ALG_SHA_512:
|
|
mbedtls_sha512_clone( &target_operation->ctx.sha512,
|
|
&source_operation->ctx.sha512 );
|
|
break;
|
|
#endif
|
|
default:
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
target_operation->alg = source_operation->alg;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
|
|
/****************************************************************/
|
|
/* MAC */
|
|
/****************************************************************/
|
|
|
|
static const mbedtls_cipher_info_t *mbedtls_cipher_info_from_psa(
|
|
psa_algorithm_t alg,
|
|
psa_key_type_t key_type,
|
|
size_t key_bits,
|
|
mbedtls_cipher_id_t* cipher_id )
|
|
{
|
|
mbedtls_cipher_mode_t mode;
|
|
mbedtls_cipher_id_t cipher_id_tmp;
|
|
|
|
if( PSA_ALG_IS_AEAD( alg ) )
|
|
alg = PSA_ALG_AEAD_WITH_TAG_LENGTH( alg, 0 );
|
|
|
|
if( PSA_ALG_IS_CIPHER( alg ) || PSA_ALG_IS_AEAD( alg ) )
|
|
{
|
|
switch( alg )
|
|
{
|
|
case PSA_ALG_ARC4:
|
|
case PSA_ALG_CHACHA20:
|
|
mode = MBEDTLS_MODE_STREAM;
|
|
break;
|
|
case PSA_ALG_CTR:
|
|
mode = MBEDTLS_MODE_CTR;
|
|
break;
|
|
case PSA_ALG_CFB:
|
|
mode = MBEDTLS_MODE_CFB;
|
|
break;
|
|
case PSA_ALG_OFB:
|
|
mode = MBEDTLS_MODE_OFB;
|
|
break;
|
|
case PSA_ALG_ECB_NO_PADDING:
|
|
mode = MBEDTLS_MODE_ECB;
|
|
break;
|
|
case PSA_ALG_CBC_NO_PADDING:
|
|
mode = MBEDTLS_MODE_CBC;
|
|
break;
|
|
case PSA_ALG_CBC_PKCS7:
|
|
mode = MBEDTLS_MODE_CBC;
|
|
break;
|
|
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_CCM, 0 ):
|
|
mode = MBEDTLS_MODE_CCM;
|
|
break;
|
|
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_GCM, 0 ):
|
|
mode = MBEDTLS_MODE_GCM;
|
|
break;
|
|
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_CHACHA20_POLY1305, 0 ):
|
|
mode = MBEDTLS_MODE_CHACHAPOLY;
|
|
break;
|
|
default:
|
|
return( NULL );
|
|
}
|
|
}
|
|
else if( alg == PSA_ALG_CMAC )
|
|
mode = MBEDTLS_MODE_ECB;
|
|
else
|
|
return( NULL );
|
|
|
|
switch( key_type )
|
|
{
|
|
case PSA_KEY_TYPE_AES:
|
|
cipher_id_tmp = MBEDTLS_CIPHER_ID_AES;
|
|
break;
|
|
case PSA_KEY_TYPE_DES:
|
|
/* key_bits is 64 for Single-DES, 128 for two-key Triple-DES,
|
|
* and 192 for three-key Triple-DES. */
|
|
if( key_bits == 64 )
|
|
cipher_id_tmp = MBEDTLS_CIPHER_ID_DES;
|
|
else
|
|
cipher_id_tmp = MBEDTLS_CIPHER_ID_3DES;
|
|
/* mbedtls doesn't recognize two-key Triple-DES as an algorithm,
|
|
* but two-key Triple-DES is functionally three-key Triple-DES
|
|
* with K1=K3, so that's how we present it to mbedtls. */
|
|
if( key_bits == 128 )
|
|
key_bits = 192;
|
|
break;
|
|
case PSA_KEY_TYPE_CAMELLIA:
|
|
cipher_id_tmp = MBEDTLS_CIPHER_ID_CAMELLIA;
|
|
break;
|
|
case PSA_KEY_TYPE_ARC4:
|
|
cipher_id_tmp = MBEDTLS_CIPHER_ID_ARC4;
|
|
break;
|
|
case PSA_KEY_TYPE_CHACHA20:
|
|
cipher_id_tmp = MBEDTLS_CIPHER_ID_CHACHA20;
|
|
break;
|
|
default:
|
|
return( NULL );
|
|
}
|
|
if( cipher_id != NULL )
|
|
*cipher_id = cipher_id_tmp;
|
|
|
|
return( mbedtls_cipher_info_from_values( cipher_id_tmp,
|
|
(int) key_bits, mode ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_MD_C)
|
|
static size_t psa_get_hash_block_size( psa_algorithm_t alg )
|
|
{
|
|
switch( alg )
|
|
{
|
|
case PSA_ALG_MD2:
|
|
return( 16 );
|
|
case PSA_ALG_MD4:
|
|
return( 64 );
|
|
case PSA_ALG_MD5:
|
|
return( 64 );
|
|
case PSA_ALG_RIPEMD160:
|
|
return( 64 );
|
|
case PSA_ALG_SHA_1:
|
|
return( 64 );
|
|
case PSA_ALG_SHA_224:
|
|
return( 64 );
|
|
case PSA_ALG_SHA_256:
|
|
return( 64 );
|
|
case PSA_ALG_SHA_384:
|
|
return( 128 );
|
|
case PSA_ALG_SHA_512:
|
|
return( 128 );
|
|
default:
|
|
return( 0 );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_MD_C */
|
|
|
|
/* Initialize the MAC operation structure. Once this function has been
|
|
* called, psa_mac_abort can run and will do the right thing. */
|
|
static psa_status_t psa_mac_init( psa_mac_operation_t *operation,
|
|
psa_algorithm_t alg )
|
|
{
|
|
psa_status_t status = PSA_ERROR_NOT_SUPPORTED;
|
|
|
|
operation->alg = alg;
|
|
operation->key_set = 0;
|
|
operation->iv_set = 0;
|
|
operation->iv_required = 0;
|
|
operation->has_input = 0;
|
|
operation->is_sign = 0;
|
|
|
|
#if defined(MBEDTLS_CMAC_C)
|
|
if( alg == PSA_ALG_CMAC )
|
|
{
|
|
operation->iv_required = 0;
|
|
mbedtls_cipher_init( &operation->ctx.cmac );
|
|
status = PSA_SUCCESS;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CMAC_C */
|
|
#if defined(MBEDTLS_MD_C)
|
|
if( PSA_ALG_IS_HMAC( operation->alg ) )
|
|
{
|
|
/* We'll set up the hash operation later in psa_hmac_setup_internal. */
|
|
operation->ctx.hmac.hash_ctx.alg = 0;
|
|
status = PSA_SUCCESS;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_MD_C */
|
|
{
|
|
if( ! PSA_ALG_IS_MAC( alg ) )
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
}
|
|
|
|
if( status != PSA_SUCCESS )
|
|
memset( operation, 0, sizeof( *operation ) );
|
|
return( status );
|
|
}
|
|
|
|
#if defined(MBEDTLS_MD_C)
|
|
static psa_status_t psa_hmac_abort_internal( psa_hmac_internal_data *hmac )
|
|
{
|
|
mbedtls_platform_zeroize( hmac->opad, sizeof( hmac->opad ) );
|
|
return( psa_hash_abort( &hmac->hash_ctx ) );
|
|
}
|
|
#endif /* MBEDTLS_MD_C */
|
|
|
|
psa_status_t psa_mac_abort( psa_mac_operation_t *operation )
|
|
{
|
|
if( operation->alg == 0 )
|
|
{
|
|
/* The object has (apparently) been initialized but it is not
|
|
* in use. It's ok to call abort on such an object, and there's
|
|
* nothing to do. */
|
|
return( PSA_SUCCESS );
|
|
}
|
|
else
|
|
#if defined(MBEDTLS_CMAC_C)
|
|
if( operation->alg == PSA_ALG_CMAC )
|
|
{
|
|
mbedtls_cipher_free( &operation->ctx.cmac );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CMAC_C */
|
|
#if defined(MBEDTLS_MD_C)
|
|
if( PSA_ALG_IS_HMAC( operation->alg ) )
|
|
{
|
|
psa_hmac_abort_internal( &operation->ctx.hmac );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_MD_C */
|
|
{
|
|
/* Sanity check (shouldn't happen: operation->alg should
|
|
* always have been initialized to a valid value). */
|
|
goto bad_state;
|
|
}
|
|
|
|
operation->alg = 0;
|
|
operation->key_set = 0;
|
|
operation->iv_set = 0;
|
|
operation->iv_required = 0;
|
|
operation->has_input = 0;
|
|
operation->is_sign = 0;
|
|
|
|
return( PSA_SUCCESS );
|
|
|
|
bad_state:
|
|
/* If abort is called on an uninitialized object, we can't trust
|
|
* anything. Wipe the object in case it contains confidential data.
|
|
* This may result in a memory leak if a pointer gets overwritten,
|
|
* but it's too late to do anything about this. */
|
|
memset( operation, 0, sizeof( *operation ) );
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
#if defined(MBEDTLS_CMAC_C)
|
|
static int psa_cmac_setup( psa_mac_operation_t *operation,
|
|
size_t key_bits,
|
|
psa_key_slot_t *slot,
|
|
const mbedtls_cipher_info_t *cipher_info )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
operation->mac_size = cipher_info->block_size;
|
|
|
|
ret = mbedtls_cipher_setup( &operation->ctx.cmac, cipher_info );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
ret = mbedtls_cipher_cmac_starts( &operation->ctx.cmac,
|
|
slot->data.key.data,
|
|
key_bits );
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_CMAC_C */
|
|
|
|
#if defined(MBEDTLS_MD_C)
|
|
static psa_status_t psa_hmac_setup_internal( psa_hmac_internal_data *hmac,
|
|
const uint8_t *key,
|
|
size_t key_length,
|
|
psa_algorithm_t hash_alg )
|
|
{
|
|
uint8_t ipad[PSA_HMAC_MAX_HASH_BLOCK_SIZE];
|
|
size_t i;
|
|
size_t hash_size = PSA_HASH_SIZE( hash_alg );
|
|
size_t block_size = psa_get_hash_block_size( hash_alg );
|
|
psa_status_t status;
|
|
|
|
/* Sanity checks on block_size, to guarantee that there won't be a buffer
|
|
* overflow below. This should never trigger if the hash algorithm
|
|
* is implemented correctly. */
|
|
/* The size checks against the ipad and opad buffers cannot be written
|
|
* `block_size > sizeof( ipad ) || block_size > sizeof( hmac->opad )`
|
|
* because that triggers -Wlogical-op on GCC 7.3. */
|
|
if( block_size > sizeof( ipad ) )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
if( block_size > sizeof( hmac->opad ) )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
if( block_size < hash_size )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
if( key_length > block_size )
|
|
{
|
|
status = psa_hash_compute( hash_alg, key, key_length,
|
|
ipad, sizeof( ipad ), &key_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
}
|
|
/* A 0-length key is not commonly used in HMAC when used as a MAC,
|
|
* but it is permitted. It is common when HMAC is used in HKDF, for
|
|
* example. Don't call `memcpy` in the 0-length because `key` could be
|
|
* an invalid pointer which would make the behavior undefined. */
|
|
else if( key_length != 0 )
|
|
memcpy( ipad, key, key_length );
|
|
|
|
/* ipad contains the key followed by garbage. Xor and fill with 0x36
|
|
* to create the ipad value. */
|
|
for( i = 0; i < key_length; i++ )
|
|
ipad[i] ^= 0x36;
|
|
memset( ipad + key_length, 0x36, block_size - key_length );
|
|
|
|
/* Copy the key material from ipad to opad, flipping the requisite bits,
|
|
* and filling the rest of opad with the requisite constant. */
|
|
for( i = 0; i < key_length; i++ )
|
|
hmac->opad[i] = ipad[i] ^ 0x36 ^ 0x5C;
|
|
memset( hmac->opad + key_length, 0x5C, block_size - key_length );
|
|
|
|
status = psa_hash_setup( &hmac->hash_ctx, hash_alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
|
|
status = psa_hash_update( &hmac->hash_ctx, ipad, block_size );
|
|
|
|
cleanup:
|
|
mbedtls_platform_zeroize( ipad, sizeof( ipad ) );
|
|
|
|
return( status );
|
|
}
|
|
#endif /* MBEDTLS_MD_C */
|
|
|
|
static psa_status_t psa_mac_setup( psa_mac_operation_t *operation,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
int is_sign )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_slot_t *slot;
|
|
size_t key_bits;
|
|
psa_key_usage_t usage =
|
|
is_sign ? PSA_KEY_USAGE_SIGN_HASH : PSA_KEY_USAGE_VERIFY_HASH;
|
|
uint8_t truncated = PSA_MAC_TRUNCATED_LENGTH( alg );
|
|
psa_algorithm_t full_length_alg = PSA_ALG_FULL_LENGTH_MAC( alg );
|
|
|
|
/* A context must be freshly initialized before it can be set up. */
|
|
if( operation->alg != 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
status = psa_mac_init( operation, full_length_alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
if( is_sign )
|
|
operation->is_sign = 1;
|
|
|
|
status = psa_get_transparent_key( key, &slot, usage, alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
key_bits = psa_get_key_slot_bits( slot );
|
|
|
|
#if defined(MBEDTLS_CMAC_C)
|
|
if( full_length_alg == PSA_ALG_CMAC )
|
|
{
|
|
const mbedtls_cipher_info_t *cipher_info =
|
|
mbedtls_cipher_info_from_psa( full_length_alg,
|
|
slot->attr.type, key_bits, NULL );
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
if( cipher_info == NULL )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
operation->mac_size = cipher_info->block_size;
|
|
ret = psa_cmac_setup( operation, key_bits, slot, cipher_info );
|
|
status = mbedtls_to_psa_error( ret );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CMAC_C */
|
|
#if defined(MBEDTLS_MD_C)
|
|
if( PSA_ALG_IS_HMAC( full_length_alg ) )
|
|
{
|
|
psa_algorithm_t hash_alg = PSA_ALG_HMAC_GET_HASH( alg );
|
|
if( hash_alg == 0 )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
|
|
operation->mac_size = PSA_HASH_SIZE( hash_alg );
|
|
/* Sanity check. This shouldn't fail on a valid configuration. */
|
|
if( operation->mac_size == 0 ||
|
|
operation->mac_size > sizeof( operation->ctx.hmac.opad ) )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
|
|
if( slot->attr.type != PSA_KEY_TYPE_HMAC )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_hmac_setup_internal( &operation->ctx.hmac,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
hash_alg );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_MD_C */
|
|
{
|
|
(void) key_bits;
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
}
|
|
|
|
if( truncated == 0 )
|
|
{
|
|
/* The "normal" case: untruncated algorithm. Nothing to do. */
|
|
}
|
|
else if( truncated < 4 )
|
|
{
|
|
/* A very short MAC is too short for security since it can be
|
|
* brute-forced. Ancient protocols with 32-bit MACs do exist,
|
|
* so we make this our minimum, even though 32 bits is still
|
|
* too small for security. */
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
}
|
|
else if( truncated > operation->mac_size )
|
|
{
|
|
/* It's impossible to "truncate" to a larger length. */
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
}
|
|
else
|
|
operation->mac_size = truncated;
|
|
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
psa_mac_abort( operation );
|
|
}
|
|
else
|
|
{
|
|
operation->key_set = 1;
|
|
}
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_mac_sign_setup( psa_mac_operation_t *operation,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg )
|
|
{
|
|
return( psa_mac_setup( operation, key, alg, 1 ) );
|
|
}
|
|
|
|
psa_status_t psa_mac_verify_setup( psa_mac_operation_t *operation,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg )
|
|
{
|
|
return( psa_mac_setup( operation, key, alg, 0 ) );
|
|
}
|
|
|
|
psa_status_t psa_mac_update( psa_mac_operation_t *operation,
|
|
const uint8_t *input,
|
|
size_t input_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_BAD_STATE;
|
|
if( ! operation->key_set )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
if( operation->iv_required && ! operation->iv_set )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
operation->has_input = 1;
|
|
|
|
#if defined(MBEDTLS_CMAC_C)
|
|
if( operation->alg == PSA_ALG_CMAC )
|
|
{
|
|
int ret = mbedtls_cipher_cmac_update( &operation->ctx.cmac,
|
|
input, input_length );
|
|
status = mbedtls_to_psa_error( ret );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CMAC_C */
|
|
#if defined(MBEDTLS_MD_C)
|
|
if( PSA_ALG_IS_HMAC( operation->alg ) )
|
|
{
|
|
status = psa_hash_update( &operation->ctx.hmac.hash_ctx, input,
|
|
input_length );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_MD_C */
|
|
{
|
|
/* This shouldn't happen if `operation` was initialized by
|
|
* a setup function. */
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( status != PSA_SUCCESS )
|
|
psa_mac_abort( operation );
|
|
return( status );
|
|
}
|
|
|
|
#if defined(MBEDTLS_MD_C)
|
|
static psa_status_t psa_hmac_finish_internal( psa_hmac_internal_data *hmac,
|
|
uint8_t *mac,
|
|
size_t mac_size )
|
|
{
|
|
uint8_t tmp[MBEDTLS_MD_MAX_SIZE];
|
|
psa_algorithm_t hash_alg = hmac->hash_ctx.alg;
|
|
size_t hash_size = 0;
|
|
size_t block_size = psa_get_hash_block_size( hash_alg );
|
|
psa_status_t status;
|
|
|
|
status = psa_hash_finish( &hmac->hash_ctx, tmp, sizeof( tmp ), &hash_size );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
/* From here on, tmp needs to be wiped. */
|
|
|
|
status = psa_hash_setup( &hmac->hash_ctx, hash_alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_hash_update( &hmac->hash_ctx, hmac->opad, block_size );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_hash_update( &hmac->hash_ctx, tmp, hash_size );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_hash_finish( &hmac->hash_ctx, tmp, sizeof( tmp ), &hash_size );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
memcpy( mac, tmp, mac_size );
|
|
|
|
exit:
|
|
mbedtls_platform_zeroize( tmp, hash_size );
|
|
return( status );
|
|
}
|
|
#endif /* MBEDTLS_MD_C */
|
|
|
|
static psa_status_t psa_mac_finish_internal( psa_mac_operation_t *operation,
|
|
uint8_t *mac,
|
|
size_t mac_size )
|
|
{
|
|
if( ! operation->key_set )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
if( operation->iv_required && ! operation->iv_set )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( mac_size < operation->mac_size )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
|
|
#if defined(MBEDTLS_CMAC_C)
|
|
if( operation->alg == PSA_ALG_CMAC )
|
|
{
|
|
uint8_t tmp[PSA_MAX_BLOCK_CIPHER_BLOCK_SIZE];
|
|
int ret = mbedtls_cipher_cmac_finish( &operation->ctx.cmac, tmp );
|
|
if( ret == 0 )
|
|
memcpy( mac, tmp, operation->mac_size );
|
|
mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CMAC_C */
|
|
#if defined(MBEDTLS_MD_C)
|
|
if( PSA_ALG_IS_HMAC( operation->alg ) )
|
|
{
|
|
return( psa_hmac_finish_internal( &operation->ctx.hmac,
|
|
mac, operation->mac_size ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_MD_C */
|
|
{
|
|
/* This shouldn't happen if `operation` was initialized by
|
|
* a setup function. */
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
}
|
|
|
|
psa_status_t psa_mac_sign_finish( psa_mac_operation_t *operation,
|
|
uint8_t *mac,
|
|
size_t mac_size,
|
|
size_t *mac_length )
|
|
{
|
|
psa_status_t status;
|
|
|
|
if( operation->alg == 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
/* Fill the output buffer with something that isn't a valid mac
|
|
* (barring an attack on the mac and deliberately-crafted input),
|
|
* in case the caller doesn't check the return status properly. */
|
|
*mac_length = mac_size;
|
|
/* If mac_size is 0 then mac may be NULL and then the
|
|
* call to memset would have undefined behavior. */
|
|
if( mac_size != 0 )
|
|
memset( mac, '!', mac_size );
|
|
|
|
if( ! operation->is_sign )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
status = psa_mac_finish_internal( operation, mac, mac_size );
|
|
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
status = psa_mac_abort( operation );
|
|
if( status == PSA_SUCCESS )
|
|
*mac_length = operation->mac_size;
|
|
else
|
|
memset( mac, '!', mac_size );
|
|
}
|
|
else
|
|
psa_mac_abort( operation );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_mac_verify_finish( psa_mac_operation_t *operation,
|
|
const uint8_t *mac,
|
|
size_t mac_length )
|
|
{
|
|
uint8_t actual_mac[PSA_MAC_MAX_SIZE];
|
|
psa_status_t status;
|
|
|
|
if( operation->alg == 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( operation->is_sign )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
if( operation->mac_size != mac_length )
|
|
{
|
|
status = PSA_ERROR_INVALID_SIGNATURE;
|
|
goto cleanup;
|
|
}
|
|
|
|
status = psa_mac_finish_internal( operation,
|
|
actual_mac, sizeof( actual_mac ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
|
|
if( safer_memcmp( mac, actual_mac, mac_length ) != 0 )
|
|
status = PSA_ERROR_INVALID_SIGNATURE;
|
|
|
|
cleanup:
|
|
if( status == PSA_SUCCESS )
|
|
status = psa_mac_abort( operation );
|
|
else
|
|
psa_mac_abort( operation );
|
|
|
|
mbedtls_platform_zeroize( actual_mac, sizeof( actual_mac ) );
|
|
|
|
return( status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Asymmetric cryptography */
|
|
/****************************************************************/
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
/* Decode the hash algorithm from alg and store the mbedtls encoding in
|
|
* md_alg. Verify that the hash length is acceptable. */
|
|
static psa_status_t psa_rsa_decode_md_type( psa_algorithm_t alg,
|
|
size_t hash_length,
|
|
mbedtls_md_type_t *md_alg )
|
|
{
|
|
psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH( alg );
|
|
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg );
|
|
*md_alg = mbedtls_md_get_type( md_info );
|
|
|
|
/* The Mbed TLS RSA module uses an unsigned int for hash length
|
|
* parameters. Validate that it fits so that we don't risk an
|
|
* overflow later. */
|
|
#if SIZE_MAX > UINT_MAX
|
|
if( hash_length > UINT_MAX )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_PKCS1_V15)
|
|
/* For PKCS#1 v1.5 signature, if using a hash, the hash length
|
|
* must be correct. */
|
|
if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) &&
|
|
alg != PSA_ALG_RSA_PKCS1V15_SIGN_RAW )
|
|
{
|
|
if( md_info == NULL )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
if( mbedtls_md_get_size( md_info ) != hash_length )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
#endif /* MBEDTLS_PKCS1_V15 */
|
|
|
|
#if defined(MBEDTLS_PKCS1_V21)
|
|
/* PSS requires a hash internally. */
|
|
if( PSA_ALG_IS_RSA_PSS( alg ) )
|
|
{
|
|
if( md_info == NULL )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
#endif /* MBEDTLS_PKCS1_V21 */
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
static psa_status_t psa_rsa_sign( mbedtls_rsa_context *rsa,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *hash,
|
|
size_t hash_length,
|
|
uint8_t *signature,
|
|
size_t signature_size,
|
|
size_t *signature_length )
|
|
{
|
|
psa_status_t status;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_md_type_t md_alg;
|
|
|
|
status = psa_rsa_decode_md_type( alg, hash_length, &md_alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
if( signature_size < mbedtls_rsa_get_len( rsa ) )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
|
|
#if defined(MBEDTLS_PKCS1_V15)
|
|
if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) )
|
|
{
|
|
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V15,
|
|
MBEDTLS_MD_NONE );
|
|
ret = mbedtls_rsa_pkcs1_sign( rsa,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg,
|
|
MBEDTLS_RSA_PRIVATE,
|
|
md_alg,
|
|
(unsigned int) hash_length,
|
|
hash,
|
|
signature );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PKCS1_V15 */
|
|
#if defined(MBEDTLS_PKCS1_V21)
|
|
if( PSA_ALG_IS_RSA_PSS( alg ) )
|
|
{
|
|
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg );
|
|
ret = mbedtls_rsa_rsassa_pss_sign( rsa,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg,
|
|
MBEDTLS_RSA_PRIVATE,
|
|
MBEDTLS_MD_NONE,
|
|
(unsigned int) hash_length,
|
|
hash,
|
|
signature );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PKCS1_V21 */
|
|
{
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
|
|
if( ret == 0 )
|
|
*signature_length = mbedtls_rsa_get_len( rsa );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
|
|
static psa_status_t psa_rsa_verify( mbedtls_rsa_context *rsa,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *hash,
|
|
size_t hash_length,
|
|
const uint8_t *signature,
|
|
size_t signature_length )
|
|
{
|
|
psa_status_t status;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_md_type_t md_alg;
|
|
|
|
status = psa_rsa_decode_md_type( alg, hash_length, &md_alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
if( signature_length != mbedtls_rsa_get_len( rsa ) )
|
|
return( PSA_ERROR_INVALID_SIGNATURE );
|
|
|
|
#if defined(MBEDTLS_PKCS1_V15)
|
|
if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) )
|
|
{
|
|
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V15,
|
|
MBEDTLS_MD_NONE );
|
|
ret = mbedtls_rsa_pkcs1_verify( rsa,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg,
|
|
MBEDTLS_RSA_PUBLIC,
|
|
md_alg,
|
|
(unsigned int) hash_length,
|
|
hash,
|
|
signature );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PKCS1_V15 */
|
|
#if defined(MBEDTLS_PKCS1_V21)
|
|
if( PSA_ALG_IS_RSA_PSS( alg ) )
|
|
{
|
|
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg );
|
|
ret = mbedtls_rsa_rsassa_pss_verify( rsa,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg,
|
|
MBEDTLS_RSA_PUBLIC,
|
|
MBEDTLS_MD_NONE,
|
|
(unsigned int) hash_length,
|
|
hash,
|
|
signature );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PKCS1_V21 */
|
|
{
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
|
|
/* Mbed TLS distinguishes "invalid padding" from "valid padding but
|
|
* the rest of the signature is invalid". This has little use in
|
|
* practice and PSA doesn't report this distinction. */
|
|
if( ret == MBEDTLS_ERR_RSA_INVALID_PADDING )
|
|
return( PSA_ERROR_INVALID_SIGNATURE );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
|
|
/* `ecp` cannot be const because `ecp->grp` needs to be non-const
|
|
* for mbedtls_ecdsa_sign() and mbedtls_ecdsa_sign_det()
|
|
* (even though these functions don't modify it). */
|
|
static psa_status_t psa_ecdsa_sign( mbedtls_ecp_keypair *ecp,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *hash,
|
|
size_t hash_length,
|
|
uint8_t *signature,
|
|
size_t signature_size,
|
|
size_t *signature_length )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_mpi r, s;
|
|
size_t curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
|
|
mbedtls_mpi_init( &r );
|
|
mbedtls_mpi_init( &s );
|
|
|
|
if( signature_size < 2 * curve_bytes )
|
|
{
|
|
ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
|
|
goto cleanup;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
|
|
if( PSA_ALG_DSA_IS_DETERMINISTIC( alg ) )
|
|
{
|
|
psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH( alg );
|
|
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg );
|
|
mbedtls_md_type_t md_alg = mbedtls_md_get_type( md_info );
|
|
MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det_ext( &ecp->grp, &r, &s,
|
|
&ecp->d, hash,
|
|
hash_length, md_alg,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg ) );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
|
|
{
|
|
(void) alg;
|
|
MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ecp->grp, &r, &s, &ecp->d,
|
|
hash, hash_length,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg ) );
|
|
}
|
|
|
|
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &r,
|
|
signature,
|
|
curve_bytes ) );
|
|
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &s,
|
|
signature + curve_bytes,
|
|
curve_bytes ) );
|
|
|
|
cleanup:
|
|
mbedtls_mpi_free( &r );
|
|
mbedtls_mpi_free( &s );
|
|
if( ret == 0 )
|
|
*signature_length = 2 * curve_bytes;
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
|
|
static psa_status_t psa_ecdsa_verify( mbedtls_ecp_keypair *ecp,
|
|
const uint8_t *hash,
|
|
size_t hash_length,
|
|
const uint8_t *signature,
|
|
size_t signature_length )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_mpi r, s;
|
|
size_t curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
|
|
mbedtls_mpi_init( &r );
|
|
mbedtls_mpi_init( &s );
|
|
|
|
if( signature_length != 2 * curve_bytes )
|
|
return( PSA_ERROR_INVALID_SIGNATURE );
|
|
|
|
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r,
|
|
signature,
|
|
curve_bytes ) );
|
|
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &s,
|
|
signature + curve_bytes,
|
|
curve_bytes ) );
|
|
|
|
/* Check whether the public part is loaded. If not, load it. */
|
|
if( mbedtls_ecp_is_zero( &ecp->Q ) )
|
|
{
|
|
MBEDTLS_MPI_CHK(
|
|
mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
|
|
mbedtls_ctr_drbg_random, &global_data.ctr_drbg ) );
|
|
}
|
|
|
|
ret = mbedtls_ecdsa_verify( &ecp->grp, hash, hash_length,
|
|
&ecp->Q, &r, &s );
|
|
|
|
cleanup:
|
|
mbedtls_mpi_free( &r );
|
|
mbedtls_mpi_free( &s );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA */
|
|
|
|
psa_status_t psa_sign_hash( mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *hash,
|
|
size_t hash_length,
|
|
uint8_t *signature,
|
|
size_t signature_size,
|
|
size_t *signature_length )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
|
|
*signature_length = signature_size;
|
|
/* Immediately reject a zero-length signature buffer. This guarantees
|
|
* that signature must be a valid pointer. (On the other hand, the hash
|
|
* buffer can in principle be empty since it doesn't actually have
|
|
* to be a hash.) */
|
|
if( signature_size == 0 )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
|
|
status = psa_get_key_from_slot( key, &slot, PSA_KEY_USAGE_SIGN_HASH, alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
if( ! PSA_KEY_TYPE_IS_KEY_PAIR( slot->attr.type ) )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
/* Try any of the available accelerators first */
|
|
status = psa_driver_wrapper_sign_hash( slot,
|
|
alg,
|
|
hash,
|
|
hash_length,
|
|
signature,
|
|
signature_size,
|
|
signature_length );
|
|
if( status != PSA_ERROR_NOT_SUPPORTED ||
|
|
psa_key_lifetime_is_external( slot->attr.lifetime ) )
|
|
goto exit;
|
|
|
|
/* If the operation was not supported by any accelerator, try fallback. */
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if( slot->attr.type == PSA_KEY_TYPE_RSA_KEY_PAIR )
|
|
{
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
|
|
status = psa_load_rsa_representation( slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&rsa );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_rsa_sign( rsa,
|
|
alg,
|
|
hash, hash_length,
|
|
signature, signature_size,
|
|
signature_length );
|
|
|
|
mbedtls_rsa_free( rsa );
|
|
mbedtls_free( rsa );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_RSA_C) */
|
|
#if defined(MBEDTLS_ECP_C)
|
|
if( PSA_KEY_TYPE_IS_ECC( slot->attr.type ) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA)
|
|
if(
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
|
|
PSA_ALG_IS_ECDSA( alg )
|
|
#else
|
|
PSA_ALG_IS_RANDOMIZED_ECDSA( alg )
|
|
#endif
|
|
)
|
|
{
|
|
mbedtls_ecp_keypair *ecp = NULL;
|
|
status = psa_load_ecp_representation( slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&ecp );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
status = psa_ecdsa_sign( ecp,
|
|
alg,
|
|
hash, hash_length,
|
|
signature, signature_size,
|
|
signature_length );
|
|
mbedtls_ecp_keypair_free( ecp );
|
|
mbedtls_free( ecp );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) */
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
}
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_ECP_C) */
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
}
|
|
|
|
exit:
|
|
/* Fill the unused part of the output buffer (the whole buffer on error,
|
|
* the trailing part on success) with something that isn't a valid mac
|
|
* (barring an attack on the mac and deliberately-crafted input),
|
|
* in case the caller doesn't check the return status properly. */
|
|
if( status == PSA_SUCCESS )
|
|
memset( signature + *signature_length, '!',
|
|
signature_size - *signature_length );
|
|
else
|
|
memset( signature, '!', signature_size );
|
|
/* If signature_size is 0 then we have nothing to do. We must not call
|
|
* memset because signature may be NULL in this case. */
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_verify_hash( mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *hash,
|
|
size_t hash_length,
|
|
const uint8_t *signature,
|
|
size_t signature_length )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
|
|
status = psa_get_key_from_slot( key, &slot,
|
|
PSA_KEY_USAGE_VERIFY_HASH, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
/* Try any of the available accelerators first */
|
|
status = psa_driver_wrapper_verify_hash( slot,
|
|
alg,
|
|
hash,
|
|
hash_length,
|
|
signature,
|
|
signature_length );
|
|
if( status != PSA_ERROR_NOT_SUPPORTED ||
|
|
psa_key_lifetime_is_external( slot->attr.lifetime ) )
|
|
return status;
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
|
|
{
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
|
|
status = psa_load_rsa_representation( slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&rsa );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
status = psa_rsa_verify( rsa,
|
|
alg,
|
|
hash, hash_length,
|
|
signature, signature_length );
|
|
mbedtls_rsa_free( rsa );
|
|
mbedtls_free( rsa );
|
|
return( status );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_RSA_C) */
|
|
#if defined(MBEDTLS_ECP_C)
|
|
if( PSA_KEY_TYPE_IS_ECC( slot->attr.type ) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
|
|
if( PSA_ALG_IS_ECDSA( alg ) )
|
|
{
|
|
mbedtls_ecp_keypair *ecp = NULL;
|
|
status = psa_load_ecp_representation( slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&ecp );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
status = psa_ecdsa_verify( ecp,
|
|
hash, hash_length,
|
|
signature, signature_length );
|
|
mbedtls_ecp_keypair_free( ecp );
|
|
mbedtls_free( ecp );
|
|
return( status );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
|
|
{
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_ECP_C) */
|
|
{
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
}
|
|
|
|
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21)
|
|
static void psa_rsa_oaep_set_padding_mode( psa_algorithm_t alg,
|
|
mbedtls_rsa_context *rsa )
|
|
{
|
|
psa_algorithm_t hash_alg = PSA_ALG_RSA_OAEP_GET_HASH( alg );
|
|
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg );
|
|
mbedtls_md_type_t md_alg = mbedtls_md_get_type( md_info );
|
|
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg );
|
|
}
|
|
#endif /* defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21) */
|
|
|
|
psa_status_t psa_asymmetric_encrypt( mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *input,
|
|
size_t input_length,
|
|
const uint8_t *salt,
|
|
size_t salt_length,
|
|
uint8_t *output,
|
|
size_t output_size,
|
|
size_t *output_length )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
|
|
(void) input;
|
|
(void) input_length;
|
|
(void) salt;
|
|
(void) output;
|
|
(void) output_size;
|
|
|
|
*output_length = 0;
|
|
|
|
if( ! PSA_ALG_IS_RSA_OAEP( alg ) && salt_length != 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
status = psa_get_transparent_key( key, &slot, PSA_KEY_USAGE_ENCRYPT, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
if( ! ( PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->attr.type ) ||
|
|
PSA_KEY_TYPE_IS_KEY_PAIR( slot->attr.type ) ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
|
|
{
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
status = psa_load_rsa_representation( slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&rsa );
|
|
if( status != PSA_SUCCESS )
|
|
goto rsa_exit;
|
|
|
|
if( output_size < mbedtls_rsa_get_len( rsa ) )
|
|
{
|
|
status = PSA_ERROR_BUFFER_TOO_SMALL;
|
|
goto rsa_exit;
|
|
}
|
|
#if defined(MBEDTLS_PKCS1_V15)
|
|
if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_rsa_pkcs1_encrypt( rsa,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg,
|
|
MBEDTLS_RSA_PUBLIC,
|
|
input_length,
|
|
input,
|
|
output ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PKCS1_V15 */
|
|
#if defined(MBEDTLS_PKCS1_V21)
|
|
if( PSA_ALG_IS_RSA_OAEP( alg ) )
|
|
{
|
|
psa_rsa_oaep_set_padding_mode( alg, rsa );
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_rsa_rsaes_oaep_encrypt( rsa,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg,
|
|
MBEDTLS_RSA_PUBLIC,
|
|
salt, salt_length,
|
|
input_length,
|
|
input,
|
|
output ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PKCS1_V21 */
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto rsa_exit;
|
|
}
|
|
rsa_exit:
|
|
if( status == PSA_SUCCESS )
|
|
*output_length = mbedtls_rsa_get_len( rsa );
|
|
|
|
mbedtls_rsa_free( rsa );
|
|
mbedtls_free( rsa );
|
|
return( status );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_RSA_C) */
|
|
{
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
}
|
|
|
|
psa_status_t psa_asymmetric_decrypt( mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *input,
|
|
size_t input_length,
|
|
const uint8_t *salt,
|
|
size_t salt_length,
|
|
uint8_t *output,
|
|
size_t output_size,
|
|
size_t *output_length )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
|
|
(void) input;
|
|
(void) input_length;
|
|
(void) salt;
|
|
(void) output;
|
|
(void) output_size;
|
|
|
|
*output_length = 0;
|
|
|
|
if( ! PSA_ALG_IS_RSA_OAEP( alg ) && salt_length != 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
status = psa_get_transparent_key( key, &slot, PSA_KEY_USAGE_DECRYPT, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
if( ! PSA_KEY_TYPE_IS_KEY_PAIR( slot->attr.type ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if( slot->attr.type == PSA_KEY_TYPE_RSA_KEY_PAIR )
|
|
{
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
status = psa_load_rsa_representation( slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes,
|
|
&rsa );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
if( input_length != mbedtls_rsa_get_len( rsa ) )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto rsa_exit;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PKCS1_V15)
|
|
if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_rsa_pkcs1_decrypt( rsa,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg,
|
|
MBEDTLS_RSA_PRIVATE,
|
|
output_length,
|
|
input,
|
|
output,
|
|
output_size ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PKCS1_V15 */
|
|
#if defined(MBEDTLS_PKCS1_V21)
|
|
if( PSA_ALG_IS_RSA_OAEP( alg ) )
|
|
{
|
|
psa_rsa_oaep_set_padding_mode( alg, rsa );
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_rsa_rsaes_oaep_decrypt( rsa,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg,
|
|
MBEDTLS_RSA_PRIVATE,
|
|
salt, salt_length,
|
|
output_length,
|
|
input,
|
|
output,
|
|
output_size ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PKCS1_V21 */
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
}
|
|
|
|
rsa_exit:
|
|
mbedtls_rsa_free( rsa );
|
|
mbedtls_free( rsa );
|
|
return( status );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_RSA_C) */
|
|
{
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Symmetric cryptography */
|
|
/****************************************************************/
|
|
|
|
static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
mbedtls_operation_t cipher_operation )
|
|
{
|
|
int ret = 0;
|
|
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
|
|
psa_key_slot_t *slot;
|
|
size_t key_bits;
|
|
const mbedtls_cipher_info_t *cipher_info = NULL;
|
|
psa_key_usage_t usage = ( cipher_operation == MBEDTLS_ENCRYPT ?
|
|
PSA_KEY_USAGE_ENCRYPT :
|
|
PSA_KEY_USAGE_DECRYPT );
|
|
|
|
/* A context must be freshly initialized before it can be set up. */
|
|
if( operation->alg != 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
/* The requested algorithm must be one that can be processed by cipher. */
|
|
if( ! PSA_ALG_IS_CIPHER( alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
/* Fetch key material from key storage. */
|
|
status = psa_get_key_from_slot( key, &slot, usage, alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* Initialize the operation struct members, except for alg. The alg member
|
|
* is used to indicate to psa_cipher_abort that there are resources to free,
|
|
* so we only set it after resources have been allocated/initialized. */
|
|
operation->key_set = 0;
|
|
operation->iv_set = 0;
|
|
operation->mbedtls_in_use = 0;
|
|
operation->iv_size = 0;
|
|
operation->block_size = 0;
|
|
if( alg == PSA_ALG_ECB_NO_PADDING )
|
|
operation->iv_required = 0;
|
|
else
|
|
operation->iv_required = 1;
|
|
|
|
/* Try doing the operation through a driver before using software fallback. */
|
|
if( cipher_operation == MBEDTLS_ENCRYPT )
|
|
status = psa_driver_wrapper_cipher_encrypt_setup( &operation->ctx.driver,
|
|
slot,
|
|
alg );
|
|
else
|
|
status = psa_driver_wrapper_cipher_decrypt_setup( &operation->ctx.driver,
|
|
slot,
|
|
alg );
|
|
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
/* Once the driver context is initialised, it needs to be freed using
|
|
* psa_cipher_abort. Indicate this through setting alg. */
|
|
operation->alg = alg;
|
|
}
|
|
|
|
if( status != PSA_ERROR_NOT_SUPPORTED ||
|
|
psa_key_lifetime_is_external( slot->attr.lifetime ) )
|
|
goto exit;
|
|
|
|
/* Proceed with initializing an mbed TLS cipher context if no driver is
|
|
* available for the given algorithm & key. */
|
|
mbedtls_cipher_init( &operation->ctx.cipher );
|
|
|
|
/* Once the cipher context is initialised, it needs to be freed using
|
|
* psa_cipher_abort. Indicate there is something to be freed through setting
|
|
* alg, and indicate the operation is being done using mbedtls crypto through
|
|
* setting mbedtls_in_use. */
|
|
operation->alg = alg;
|
|
operation->mbedtls_in_use = 1;
|
|
|
|
key_bits = psa_get_key_slot_bits( slot );
|
|
cipher_info = mbedtls_cipher_info_from_psa( alg, slot->attr.type, key_bits, NULL );
|
|
if( cipher_info == NULL )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_cipher_setup( &operation->ctx.cipher, cipher_info );
|
|
if( ret != 0 )
|
|
goto exit;
|
|
|
|
#if defined(MBEDTLS_DES_C)
|
|
if( slot->attr.type == PSA_KEY_TYPE_DES && key_bits == 128 )
|
|
{
|
|
/* Two-key Triple-DES is 3-key Triple-DES with K1=K3 */
|
|
uint8_t keys[24];
|
|
memcpy( keys, slot->data.key.data, 16 );
|
|
memcpy( keys + 16, slot->data.key.data, 8 );
|
|
ret = mbedtls_cipher_setkey( &operation->ctx.cipher,
|
|
keys,
|
|
192, cipher_operation );
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
ret = mbedtls_cipher_setkey( &operation->ctx.cipher,
|
|
slot->data.key.data,
|
|
(int) key_bits, cipher_operation );
|
|
}
|
|
if( ret != 0 )
|
|
goto exit;
|
|
|
|
#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
|
|
switch( alg )
|
|
{
|
|
case PSA_ALG_CBC_NO_PADDING:
|
|
ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher,
|
|
MBEDTLS_PADDING_NONE );
|
|
break;
|
|
case PSA_ALG_CBC_PKCS7:
|
|
ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher,
|
|
MBEDTLS_PADDING_PKCS7 );
|
|
break;
|
|
default:
|
|
/* The algorithm doesn't involve padding. */
|
|
ret = 0;
|
|
break;
|
|
}
|
|
if( ret != 0 )
|
|
goto exit;
|
|
#endif //MBEDTLS_CIPHER_MODE_WITH_PADDING
|
|
|
|
operation->block_size = ( PSA_ALG_IS_STREAM_CIPHER( alg ) ? 1 :
|
|
PSA_BLOCK_CIPHER_BLOCK_SIZE( slot->attr.type ) );
|
|
if( ( alg & PSA_ALG_CIPHER_FROM_BLOCK_FLAG ) != 0 &&
|
|
alg != PSA_ALG_ECB_NO_PADDING )
|
|
{
|
|
operation->iv_size = PSA_BLOCK_CIPHER_BLOCK_SIZE( slot->attr.type );
|
|
}
|
|
#if defined(MBEDTLS_CHACHA20_C)
|
|
else
|
|
if( alg == PSA_ALG_CHACHA20 )
|
|
operation->iv_size = 12;
|
|
#endif
|
|
|
|
status = PSA_SUCCESS;
|
|
|
|
exit:
|
|
if( ret != 0 )
|
|
status = mbedtls_to_psa_error( ret );
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
/* Update operation flags for both driver and software implementations */
|
|
operation->key_set = 1;
|
|
}
|
|
else
|
|
psa_cipher_abort( operation );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_cipher_encrypt_setup( psa_cipher_operation_t *operation,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg )
|
|
{
|
|
return( psa_cipher_setup( operation, key, alg, MBEDTLS_ENCRYPT ) );
|
|
}
|
|
|
|
psa_status_t psa_cipher_decrypt_setup( psa_cipher_operation_t *operation,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg )
|
|
{
|
|
return( psa_cipher_setup( operation, key, alg, MBEDTLS_DECRYPT ) );
|
|
}
|
|
|
|
psa_status_t psa_cipher_generate_iv( psa_cipher_operation_t *operation,
|
|
uint8_t *iv,
|
|
size_t iv_size,
|
|
size_t *iv_length )
|
|
{
|
|
psa_status_t status;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
if( operation->iv_set || ! operation->iv_required )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( operation->mbedtls_in_use == 0 )
|
|
{
|
|
status = psa_driver_wrapper_cipher_generate_iv( &operation->ctx.driver,
|
|
iv,
|
|
iv_size,
|
|
iv_length );
|
|
goto exit;
|
|
}
|
|
|
|
if( iv_size < operation->iv_size )
|
|
{
|
|
status = PSA_ERROR_BUFFER_TOO_SMALL;
|
|
goto exit;
|
|
}
|
|
ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg,
|
|
iv, operation->iv_size );
|
|
if( ret != 0 )
|
|
{
|
|
status = mbedtls_to_psa_error( ret );
|
|
goto exit;
|
|
}
|
|
|
|
*iv_length = operation->iv_size;
|
|
status = psa_cipher_set_iv( operation, iv, *iv_length );
|
|
|
|
exit:
|
|
if( status == PSA_SUCCESS )
|
|
operation->iv_set = 1;
|
|
else
|
|
psa_cipher_abort( operation );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_cipher_set_iv( psa_cipher_operation_t *operation,
|
|
const uint8_t *iv,
|
|
size_t iv_length )
|
|
{
|
|
psa_status_t status;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
if( operation->iv_set || ! operation->iv_required )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( operation->mbedtls_in_use == 0 )
|
|
{
|
|
status = psa_driver_wrapper_cipher_set_iv( &operation->ctx.driver,
|
|
iv,
|
|
iv_length );
|
|
goto exit;
|
|
}
|
|
|
|
if( iv_length != operation->iv_size )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
ret = mbedtls_cipher_set_iv( &operation->ctx.cipher, iv, iv_length );
|
|
status = mbedtls_to_psa_error( ret );
|
|
exit:
|
|
if( status == PSA_SUCCESS )
|
|
operation->iv_set = 1;
|
|
else
|
|
psa_cipher_abort( operation );
|
|
return( status );
|
|
}
|
|
|
|
/* Process input for which the algorithm is set to ECB mode. This requires
|
|
* manual processing, since the PSA API is defined as being able to process
|
|
* arbitrary-length calls to psa_cipher_update() with ECB mode, but the
|
|
* underlying mbedtls_cipher_update only takes full blocks. */
|
|
static psa_status_t psa_cipher_update_ecb_internal(
|
|
mbedtls_cipher_context_t *ctx,
|
|
const uint8_t *input,
|
|
size_t input_length,
|
|
uint8_t *output,
|
|
size_t output_size,
|
|
size_t *output_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
size_t block_size = ctx->cipher_info->block_size;
|
|
size_t internal_output_length = 0;
|
|
*output_length = 0;
|
|
|
|
if( input_length == 0 )
|
|
{
|
|
status = PSA_SUCCESS;
|
|
goto exit;
|
|
}
|
|
|
|
if( ctx->unprocessed_len > 0 )
|
|
{
|
|
/* Fill up to block size, and run the block if there's a full one. */
|
|
size_t bytes_to_copy = block_size - ctx->unprocessed_len;
|
|
|
|
if( input_length < bytes_to_copy )
|
|
bytes_to_copy = input_length;
|
|
|
|
memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ),
|
|
input, bytes_to_copy );
|
|
input_length -= bytes_to_copy;
|
|
input += bytes_to_copy;
|
|
ctx->unprocessed_len += bytes_to_copy;
|
|
|
|
if( ctx->unprocessed_len == block_size )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_cipher_update( ctx,
|
|
ctx->unprocessed_data,
|
|
block_size,
|
|
output, &internal_output_length ) );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
output += internal_output_length;
|
|
output_size -= internal_output_length;
|
|
*output_length += internal_output_length;
|
|
ctx->unprocessed_len = 0;
|
|
}
|
|
}
|
|
|
|
while( input_length >= block_size )
|
|
{
|
|
/* Run all full blocks we have, one by one */
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_cipher_update( ctx, input,
|
|
block_size,
|
|
output, &internal_output_length ) );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
input_length -= block_size;
|
|
input += block_size;
|
|
|
|
output += internal_output_length;
|
|
output_size -= internal_output_length;
|
|
*output_length += internal_output_length;
|
|
}
|
|
|
|
if( input_length > 0 )
|
|
{
|
|
/* Save unprocessed bytes for later processing */
|
|
memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ),
|
|
input, input_length );
|
|
ctx->unprocessed_len += input_length;
|
|
}
|
|
|
|
status = PSA_SUCCESS;
|
|
|
|
exit:
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_cipher_update( psa_cipher_operation_t *operation,
|
|
const uint8_t *input,
|
|
size_t input_length,
|
|
uint8_t *output,
|
|
size_t output_size,
|
|
size_t *output_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
size_t expected_output_size;
|
|
if( operation->alg == 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
if( operation->iv_required && ! operation->iv_set )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( operation->mbedtls_in_use == 0 )
|
|
{
|
|
status = psa_driver_wrapper_cipher_update( &operation->ctx.driver,
|
|
input,
|
|
input_length,
|
|
output,
|
|
output_size,
|
|
output_length );
|
|
goto exit;
|
|
}
|
|
|
|
if( ! PSA_ALG_IS_STREAM_CIPHER( operation->alg ) )
|
|
{
|
|
/* Take the unprocessed partial block left over from previous
|
|
* update calls, if any, plus the input to this call. Remove
|
|
* the last partial block, if any. You get the data that will be
|
|
* output in this call. */
|
|
expected_output_size =
|
|
( operation->ctx.cipher.unprocessed_len + input_length )
|
|
/ operation->block_size * operation->block_size;
|
|
}
|
|
else
|
|
{
|
|
expected_output_size = input_length;
|
|
}
|
|
|
|
if( output_size < expected_output_size )
|
|
{
|
|
status = PSA_ERROR_BUFFER_TOO_SMALL;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->alg == PSA_ALG_ECB_NO_PADDING )
|
|
{
|
|
/* mbedtls_cipher_update has an API inconsistency: it will only
|
|
* process a single block at a time in ECB mode. Abstract away that
|
|
* inconsistency here to match the PSA API behaviour. */
|
|
status = psa_cipher_update_ecb_internal( &operation->ctx.cipher,
|
|
input,
|
|
input_length,
|
|
output,
|
|
output_size,
|
|
output_length );
|
|
}
|
|
else
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_cipher_update( &operation->ctx.cipher, input,
|
|
input_length, output, output_length ) );
|
|
}
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
psa_cipher_abort( operation );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_cipher_finish( psa_cipher_operation_t *operation,
|
|
uint8_t *output,
|
|
size_t output_size,
|
|
size_t *output_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
|
|
uint8_t temp_output_buffer[MBEDTLS_MAX_BLOCK_LENGTH];
|
|
if( operation->alg == 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
if( operation->iv_required && ! operation->iv_set )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( operation->mbedtls_in_use == 0 )
|
|
{
|
|
status = psa_driver_wrapper_cipher_finish( &operation->ctx.driver,
|
|
output,
|
|
output_size,
|
|
output_length );
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->ctx.cipher.unprocessed_len != 0 )
|
|
{
|
|
if( operation->alg == PSA_ALG_ECB_NO_PADDING ||
|
|
operation->alg == PSA_ALG_CBC_NO_PADDING )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_cipher_finish( &operation->ctx.cipher,
|
|
temp_output_buffer,
|
|
output_length ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
if( *output_length == 0 )
|
|
; /* Nothing to copy. Note that output may be NULL in this case. */
|
|
else if( output_size >= *output_length )
|
|
memcpy( output, temp_output_buffer, *output_length );
|
|
else
|
|
status = PSA_ERROR_BUFFER_TOO_SMALL;
|
|
|
|
exit:
|
|
if( operation->mbedtls_in_use == 1 )
|
|
mbedtls_platform_zeroize( temp_output_buffer, sizeof( temp_output_buffer ) );
|
|
|
|
if( status == PSA_SUCCESS )
|
|
return( psa_cipher_abort( operation ) );
|
|
else
|
|
{
|
|
*output_length = 0;
|
|
(void) psa_cipher_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
}
|
|
|
|
psa_status_t psa_cipher_abort( psa_cipher_operation_t *operation )
|
|
{
|
|
if( operation->alg == 0 )
|
|
{
|
|
/* The object has (apparently) been initialized but it is not (yet)
|
|
* in use. It's ok to call abort on such an object, and there's
|
|
* nothing to do. */
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/* Sanity check (shouldn't happen: operation->alg should
|
|
* always have been initialized to a valid value). */
|
|
if( ! PSA_ALG_IS_CIPHER( operation->alg ) )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( operation->mbedtls_in_use == 0 )
|
|
psa_driver_wrapper_cipher_abort( &operation->ctx.driver );
|
|
else
|
|
mbedtls_cipher_free( &operation->ctx.cipher );
|
|
|
|
operation->alg = 0;
|
|
operation->key_set = 0;
|
|
operation->iv_set = 0;
|
|
operation->mbedtls_in_use = 0;
|
|
operation->iv_size = 0;
|
|
operation->block_size = 0;
|
|
operation->iv_required = 0;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* AEAD */
|
|
/****************************************************************/
|
|
|
|
typedef struct
|
|
{
|
|
psa_key_slot_t *slot;
|
|
const mbedtls_cipher_info_t *cipher_info;
|
|
union
|
|
{
|
|
#if defined(MBEDTLS_CCM_C)
|
|
mbedtls_ccm_context ccm;
|
|
#endif /* MBEDTLS_CCM_C */
|
|
#if defined(MBEDTLS_GCM_C)
|
|
mbedtls_gcm_context gcm;
|
|
#endif /* MBEDTLS_GCM_C */
|
|
#if defined(MBEDTLS_CHACHAPOLY_C)
|
|
mbedtls_chachapoly_context chachapoly;
|
|
#endif /* MBEDTLS_CHACHAPOLY_C */
|
|
} ctx;
|
|
psa_algorithm_t core_alg;
|
|
uint8_t full_tag_length;
|
|
uint8_t tag_length;
|
|
} aead_operation_t;
|
|
|
|
static void psa_aead_abort_internal( aead_operation_t *operation )
|
|
{
|
|
switch( operation->core_alg )
|
|
{
|
|
#if defined(MBEDTLS_CCM_C)
|
|
case PSA_ALG_CCM:
|
|
mbedtls_ccm_free( &operation->ctx.ccm );
|
|
break;
|
|
#endif /* MBEDTLS_CCM_C */
|
|
#if defined(MBEDTLS_GCM_C)
|
|
case PSA_ALG_GCM:
|
|
mbedtls_gcm_free( &operation->ctx.gcm );
|
|
break;
|
|
#endif /* MBEDTLS_GCM_C */
|
|
}
|
|
}
|
|
|
|
static psa_status_t psa_aead_setup( aead_operation_t *operation,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_key_usage_t usage,
|
|
psa_algorithm_t alg )
|
|
{
|
|
psa_status_t status;
|
|
size_t key_bits;
|
|
mbedtls_cipher_id_t cipher_id;
|
|
|
|
status = psa_get_transparent_key( key, &operation->slot, usage, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
key_bits = psa_get_key_slot_bits( operation->slot );
|
|
|
|
operation->cipher_info =
|
|
mbedtls_cipher_info_from_psa( alg, operation->slot->attr.type, key_bits,
|
|
&cipher_id );
|
|
if( operation->cipher_info == NULL )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
switch( PSA_ALG_AEAD_WITH_TAG_LENGTH( alg, 0 ) )
|
|
{
|
|
#if defined(MBEDTLS_CCM_C)
|
|
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_CCM, 0 ):
|
|
operation->core_alg = PSA_ALG_CCM;
|
|
operation->full_tag_length = 16;
|
|
/* CCM allows the following tag lengths: 4, 6, 8, 10, 12, 14, 16.
|
|
* The call to mbedtls_ccm_encrypt_and_tag or
|
|
* mbedtls_ccm_auth_decrypt will validate the tag length. */
|
|
if( PSA_BLOCK_CIPHER_BLOCK_SIZE( operation->slot->attr.type ) != 16 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
mbedtls_ccm_init( &operation->ctx.ccm );
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ccm_setkey( &operation->ctx.ccm, cipher_id,
|
|
operation->slot->data.key.data,
|
|
(unsigned int) key_bits ) );
|
|
if( status != 0 )
|
|
goto cleanup;
|
|
break;
|
|
#endif /* MBEDTLS_CCM_C */
|
|
|
|
#if defined(MBEDTLS_GCM_C)
|
|
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_GCM, 0 ):
|
|
operation->core_alg = PSA_ALG_GCM;
|
|
operation->full_tag_length = 16;
|
|
/* GCM allows the following tag lengths: 4, 8, 12, 13, 14, 15, 16.
|
|
* The call to mbedtls_gcm_crypt_and_tag or
|
|
* mbedtls_gcm_auth_decrypt will validate the tag length. */
|
|
if( PSA_BLOCK_CIPHER_BLOCK_SIZE( operation->slot->attr.type ) != 16 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
mbedtls_gcm_init( &operation->ctx.gcm );
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_gcm_setkey( &operation->ctx.gcm, cipher_id,
|
|
operation->slot->data.key.data,
|
|
(unsigned int) key_bits ) );
|
|
if( status != 0 )
|
|
goto cleanup;
|
|
break;
|
|
#endif /* MBEDTLS_GCM_C */
|
|
|
|
#if defined(MBEDTLS_CHACHAPOLY_C)
|
|
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_CHACHA20_POLY1305, 0 ):
|
|
operation->core_alg = PSA_ALG_CHACHA20_POLY1305;
|
|
operation->full_tag_length = 16;
|
|
/* We only support the default tag length. */
|
|
if( alg != PSA_ALG_CHACHA20_POLY1305 )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
mbedtls_chachapoly_init( &operation->ctx.chachapoly );
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_chachapoly_setkey( &operation->ctx.chachapoly,
|
|
operation->slot->data.key.data ) );
|
|
if( status != 0 )
|
|
goto cleanup;
|
|
break;
|
|
#endif /* MBEDTLS_CHACHAPOLY_C */
|
|
|
|
default:
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
if( PSA_AEAD_TAG_LENGTH( alg ) > operation->full_tag_length )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto cleanup;
|
|
}
|
|
operation->tag_length = PSA_AEAD_TAG_LENGTH( alg );
|
|
|
|
return( PSA_SUCCESS );
|
|
|
|
cleanup:
|
|
psa_aead_abort_internal( operation );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_aead_encrypt( mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *nonce,
|
|
size_t nonce_length,
|
|
const uint8_t *additional_data,
|
|
size_t additional_data_length,
|
|
const uint8_t *plaintext,
|
|
size_t plaintext_length,
|
|
uint8_t *ciphertext,
|
|
size_t ciphertext_size,
|
|
size_t *ciphertext_length )
|
|
{
|
|
psa_status_t status;
|
|
aead_operation_t operation;
|
|
uint8_t *tag;
|
|
|
|
*ciphertext_length = 0;
|
|
|
|
status = psa_aead_setup( &operation, key, PSA_KEY_USAGE_ENCRYPT, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
/* For all currently supported modes, the tag is at the end of the
|
|
* ciphertext. */
|
|
if( ciphertext_size < ( plaintext_length + operation.tag_length ) )
|
|
{
|
|
status = PSA_ERROR_BUFFER_TOO_SMALL;
|
|
goto exit;
|
|
}
|
|
tag = ciphertext + plaintext_length;
|
|
|
|
#if defined(MBEDTLS_GCM_C)
|
|
if( operation.core_alg == PSA_ALG_GCM )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_gcm_crypt_and_tag( &operation.ctx.gcm,
|
|
MBEDTLS_GCM_ENCRYPT,
|
|
plaintext_length,
|
|
nonce, nonce_length,
|
|
additional_data, additional_data_length,
|
|
plaintext, ciphertext,
|
|
operation.tag_length, tag ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_GCM_C */
|
|
#if defined(MBEDTLS_CCM_C)
|
|
if( operation.core_alg == PSA_ALG_CCM )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ccm_encrypt_and_tag( &operation.ctx.ccm,
|
|
plaintext_length,
|
|
nonce, nonce_length,
|
|
additional_data,
|
|
additional_data_length,
|
|
plaintext, ciphertext,
|
|
tag, operation.tag_length ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CCM_C */
|
|
#if defined(MBEDTLS_CHACHAPOLY_C)
|
|
if( operation.core_alg == PSA_ALG_CHACHA20_POLY1305 )
|
|
{
|
|
if( nonce_length != 12 || operation.tag_length != 16 )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_chachapoly_encrypt_and_tag( &operation.ctx.chachapoly,
|
|
plaintext_length,
|
|
nonce,
|
|
additional_data,
|
|
additional_data_length,
|
|
plaintext,
|
|
ciphertext,
|
|
tag ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CHACHAPOLY_C */
|
|
{
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
if( status != PSA_SUCCESS && ciphertext_size != 0 )
|
|
memset( ciphertext, 0, ciphertext_size );
|
|
|
|
exit:
|
|
psa_aead_abort_internal( &operation );
|
|
if( status == PSA_SUCCESS )
|
|
*ciphertext_length = plaintext_length + operation.tag_length;
|
|
return( status );
|
|
}
|
|
|
|
/* Locate the tag in a ciphertext buffer containing the encrypted data
|
|
* followed by the tag. Return the length of the part preceding the tag in
|
|
* *plaintext_length. This is the size of the plaintext in modes where
|
|
* the encrypted data has the same size as the plaintext, such as
|
|
* CCM and GCM. */
|
|
static psa_status_t psa_aead_unpadded_locate_tag( size_t tag_length,
|
|
const uint8_t *ciphertext,
|
|
size_t ciphertext_length,
|
|
size_t plaintext_size,
|
|
const uint8_t **p_tag )
|
|
{
|
|
size_t payload_length;
|
|
if( tag_length > ciphertext_length )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
payload_length = ciphertext_length - tag_length;
|
|
if( payload_length > plaintext_size )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
*p_tag = ciphertext + payload_length;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_aead_decrypt( mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *nonce,
|
|
size_t nonce_length,
|
|
const uint8_t *additional_data,
|
|
size_t additional_data_length,
|
|
const uint8_t *ciphertext,
|
|
size_t ciphertext_length,
|
|
uint8_t *plaintext,
|
|
size_t plaintext_size,
|
|
size_t *plaintext_length )
|
|
{
|
|
psa_status_t status;
|
|
aead_operation_t operation;
|
|
const uint8_t *tag = NULL;
|
|
|
|
*plaintext_length = 0;
|
|
|
|
status = psa_aead_setup( &operation, key, PSA_KEY_USAGE_DECRYPT, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
status = psa_aead_unpadded_locate_tag( operation.tag_length,
|
|
ciphertext, ciphertext_length,
|
|
plaintext_size, &tag );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
#if defined(MBEDTLS_GCM_C)
|
|
if( operation.core_alg == PSA_ALG_GCM )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_gcm_auth_decrypt( &operation.ctx.gcm,
|
|
ciphertext_length - operation.tag_length,
|
|
nonce, nonce_length,
|
|
additional_data,
|
|
additional_data_length,
|
|
tag, operation.tag_length,
|
|
ciphertext, plaintext ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_GCM_C */
|
|
#if defined(MBEDTLS_CCM_C)
|
|
if( operation.core_alg == PSA_ALG_CCM )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ccm_auth_decrypt( &operation.ctx.ccm,
|
|
ciphertext_length - operation.tag_length,
|
|
nonce, nonce_length,
|
|
additional_data,
|
|
additional_data_length,
|
|
ciphertext, plaintext,
|
|
tag, operation.tag_length ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CCM_C */
|
|
#if defined(MBEDTLS_CHACHAPOLY_C)
|
|
if( operation.core_alg == PSA_ALG_CHACHA20_POLY1305 )
|
|
{
|
|
if( nonce_length != 12 || operation.tag_length != 16 )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_chachapoly_auth_decrypt( &operation.ctx.chachapoly,
|
|
ciphertext_length - operation.tag_length,
|
|
nonce,
|
|
additional_data,
|
|
additional_data_length,
|
|
tag,
|
|
ciphertext,
|
|
plaintext ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CHACHAPOLY_C */
|
|
{
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
if( status != PSA_SUCCESS && plaintext_size != 0 )
|
|
memset( plaintext, 0, plaintext_size );
|
|
|
|
exit:
|
|
psa_aead_abort_internal( &operation );
|
|
if( status == PSA_SUCCESS )
|
|
*plaintext_length = ciphertext_length - operation.tag_length;
|
|
return( status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Generators */
|
|
/****************************************************************/
|
|
|
|
#define HKDF_STATE_INIT 0 /* no input yet */
|
|
#define HKDF_STATE_STARTED 1 /* got salt */
|
|
#define HKDF_STATE_KEYED 2 /* got key */
|
|
#define HKDF_STATE_OUTPUT 3 /* output started */
|
|
|
|
static psa_algorithm_t psa_key_derivation_get_kdf_alg(
|
|
const psa_key_derivation_operation_t *operation )
|
|
{
|
|
if ( PSA_ALG_IS_KEY_AGREEMENT( operation->alg ) )
|
|
return( PSA_ALG_KEY_AGREEMENT_GET_KDF( operation->alg ) );
|
|
else
|
|
return( operation->alg );
|
|
}
|
|
|
|
|
|
psa_status_t psa_key_derivation_abort( psa_key_derivation_operation_t *operation )
|
|
{
|
|
psa_status_t status = PSA_SUCCESS;
|
|
psa_algorithm_t kdf_alg = psa_key_derivation_get_kdf_alg( operation );
|
|
if( kdf_alg == 0 )
|
|
{
|
|
/* The object has (apparently) been initialized but it is not
|
|
* in use. It's ok to call abort on such an object, and there's
|
|
* nothing to do. */
|
|
}
|
|
else
|
|
#if defined(MBEDTLS_MD_C)
|
|
if( PSA_ALG_IS_HKDF( kdf_alg ) )
|
|
{
|
|
mbedtls_free( operation->ctx.hkdf.info );
|
|
status = psa_hmac_abort_internal( &operation->ctx.hkdf.hmac );
|
|
}
|
|
else if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
|
|
/* TLS-1.2 PSK-to-MS KDF uses the same core as TLS-1.2 PRF */
|
|
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
|
|
{
|
|
if( operation->ctx.tls12_prf.seed != NULL )
|
|
{
|
|
mbedtls_platform_zeroize( operation->ctx.tls12_prf.seed,
|
|
operation->ctx.tls12_prf.seed_length );
|
|
mbedtls_free( operation->ctx.tls12_prf.seed );
|
|
}
|
|
|
|
if( operation->ctx.tls12_prf.label != NULL )
|
|
{
|
|
mbedtls_platform_zeroize( operation->ctx.tls12_prf.label,
|
|
operation->ctx.tls12_prf.label_length );
|
|
mbedtls_free( operation->ctx.tls12_prf.label );
|
|
}
|
|
|
|
status = psa_hmac_abort_internal( &operation->ctx.tls12_prf.hmac );
|
|
|
|
/* We leave the fields Ai and output_block to be erased safely by the
|
|
* mbedtls_platform_zeroize() in the end of this function. */
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_MD_C */
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
}
|
|
mbedtls_platform_zeroize( operation, sizeof( *operation ) );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_key_derivation_get_capacity(const psa_key_derivation_operation_t *operation,
|
|
size_t *capacity)
|
|
{
|
|
if( operation->alg == 0 )
|
|
{
|
|
/* This is a blank key derivation operation. */
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
*capacity = operation->capacity;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_key_derivation_set_capacity( psa_key_derivation_operation_t *operation,
|
|
size_t capacity )
|
|
{
|
|
if( operation->alg == 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
if( capacity > operation->capacity )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
operation->capacity = capacity;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
#if defined(MBEDTLS_MD_C)
|
|
/* Read some bytes from an HKDF-based operation. This performs a chunk
|
|
* of the expand phase of the HKDF algorithm. */
|
|
static psa_status_t psa_key_derivation_hkdf_read( psa_hkdf_key_derivation_t *hkdf,
|
|
psa_algorithm_t hash_alg,
|
|
uint8_t *output,
|
|
size_t output_length )
|
|
{
|
|
uint8_t hash_length = PSA_HASH_SIZE( hash_alg );
|
|
psa_status_t status;
|
|
|
|
if( hkdf->state < HKDF_STATE_KEYED || ! hkdf->info_set )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
hkdf->state = HKDF_STATE_OUTPUT;
|
|
|
|
while( output_length != 0 )
|
|
{
|
|
/* Copy what remains of the current block */
|
|
uint8_t n = hash_length - hkdf->offset_in_block;
|
|
if( n > output_length )
|
|
n = (uint8_t) output_length;
|
|
memcpy( output, hkdf->output_block + hkdf->offset_in_block, n );
|
|
output += n;
|
|
output_length -= n;
|
|
hkdf->offset_in_block += n;
|
|
if( output_length == 0 )
|
|
break;
|
|
/* We can't be wanting more output after block 0xff, otherwise
|
|
* the capacity check in psa_key_derivation_output_bytes() would have
|
|
* prevented this call. It could happen only if the operation
|
|
* object was corrupted or if this function is called directly
|
|
* inside the library. */
|
|
if( hkdf->block_number == 0xff )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
/* We need a new block */
|
|
++hkdf->block_number;
|
|
hkdf->offset_in_block = 0;
|
|
status = psa_hmac_setup_internal( &hkdf->hmac,
|
|
hkdf->prk, hash_length,
|
|
hash_alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
if( hkdf->block_number != 1 )
|
|
{
|
|
status = psa_hash_update( &hkdf->hmac.hash_ctx,
|
|
hkdf->output_block,
|
|
hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
}
|
|
status = psa_hash_update( &hkdf->hmac.hash_ctx,
|
|
hkdf->info,
|
|
hkdf->info_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
status = psa_hash_update( &hkdf->hmac.hash_ctx,
|
|
&hkdf->block_number, 1 );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
status = psa_hmac_finish_internal( &hkdf->hmac,
|
|
hkdf->output_block,
|
|
sizeof( hkdf->output_block ) );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
}
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
static psa_status_t psa_key_derivation_tls12_prf_generate_next_block(
|
|
psa_tls12_prf_key_derivation_t *tls12_prf,
|
|
psa_algorithm_t alg )
|
|
{
|
|
psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( alg );
|
|
uint8_t hash_length = PSA_HASH_SIZE( hash_alg );
|
|
psa_hash_operation_t backup = PSA_HASH_OPERATION_INIT;
|
|
psa_status_t status, cleanup_status;
|
|
|
|
/* We can't be wanting more output after block 0xff, otherwise
|
|
* the capacity check in psa_key_derivation_output_bytes() would have
|
|
* prevented this call. It could happen only if the operation
|
|
* object was corrupted or if this function is called directly
|
|
* inside the library. */
|
|
if( tls12_prf->block_number == 0xff )
|
|
return( PSA_ERROR_CORRUPTION_DETECTED );
|
|
|
|
/* We need a new block */
|
|
++tls12_prf->block_number;
|
|
tls12_prf->left_in_block = hash_length;
|
|
|
|
/* Recall the definition of the TLS-1.2-PRF from RFC 5246:
|
|
*
|
|
* PRF(secret, label, seed) = P_<hash>(secret, label + seed)
|
|
*
|
|
* P_hash(secret, seed) = HMAC_hash(secret, A(1) + seed) +
|
|
* HMAC_hash(secret, A(2) + seed) +
|
|
* HMAC_hash(secret, A(3) + seed) + ...
|
|
*
|
|
* A(0) = seed
|
|
* A(i) = HMAC_hash(secret, A(i-1))
|
|
*
|
|
* The `psa_tls12_prf_key_derivation` structure saves the block
|
|
* `HMAC_hash(secret, A(i) + seed)` from which the output
|
|
* is currently extracted as `output_block` and where i is
|
|
* `block_number`.
|
|
*/
|
|
|
|
/* Save the hash context before using it, to preserve the hash state with
|
|
* only the inner padding in it. We need this, because inner padding depends
|
|
* on the key (secret in the RFC's terminology). */
|
|
status = psa_hash_clone( &tls12_prf->hmac.hash_ctx, &backup );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
|
|
/* Calculate A(i) where i = tls12_prf->block_number. */
|
|
if( tls12_prf->block_number == 1 )
|
|
{
|
|
/* A(1) = HMAC_hash(secret, A(0)), where A(0) = seed. (The RFC overloads
|
|
* the variable seed and in this instance means it in the context of the
|
|
* P_hash function, where seed = label + seed.) */
|
|
status = psa_hash_update( &tls12_prf->hmac.hash_ctx,
|
|
tls12_prf->label, tls12_prf->label_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_hash_update( &tls12_prf->hmac.hash_ctx,
|
|
tls12_prf->seed, tls12_prf->seed_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
}
|
|
else
|
|
{
|
|
/* A(i) = HMAC_hash(secret, A(i-1)) */
|
|
status = psa_hash_update( &tls12_prf->hmac.hash_ctx,
|
|
tls12_prf->Ai, hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
}
|
|
|
|
status = psa_hmac_finish_internal( &tls12_prf->hmac,
|
|
tls12_prf->Ai, hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_hash_clone( &backup, &tls12_prf->hmac.hash_ctx );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
|
|
/* Calculate HMAC_hash(secret, A(i) + label + seed). */
|
|
status = psa_hash_update( &tls12_prf->hmac.hash_ctx,
|
|
tls12_prf->Ai, hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_hash_update( &tls12_prf->hmac.hash_ctx,
|
|
tls12_prf->label, tls12_prf->label_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_hash_update( &tls12_prf->hmac.hash_ctx,
|
|
tls12_prf->seed, tls12_prf->seed_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_hmac_finish_internal( &tls12_prf->hmac,
|
|
tls12_prf->output_block, hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_hash_clone( &backup, &tls12_prf->hmac.hash_ctx );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
|
|
|
|
cleanup:
|
|
|
|
cleanup_status = psa_hash_abort( &backup );
|
|
if( status == PSA_SUCCESS && cleanup_status != PSA_SUCCESS )
|
|
status = cleanup_status;
|
|
|
|
return( status );
|
|
}
|
|
|
|
static psa_status_t psa_key_derivation_tls12_prf_read(
|
|
psa_tls12_prf_key_derivation_t *tls12_prf,
|
|
psa_algorithm_t alg,
|
|
uint8_t *output,
|
|
size_t output_length )
|
|
{
|
|
psa_algorithm_t hash_alg = PSA_ALG_TLS12_PRF_GET_HASH( alg );
|
|
uint8_t hash_length = PSA_HASH_SIZE( hash_alg );
|
|
psa_status_t status;
|
|
uint8_t offset, length;
|
|
|
|
while( output_length != 0 )
|
|
{
|
|
/* Check if we have fully processed the current block. */
|
|
if( tls12_prf->left_in_block == 0 )
|
|
{
|
|
status = psa_key_derivation_tls12_prf_generate_next_block( tls12_prf,
|
|
alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
continue;
|
|
}
|
|
|
|
if( tls12_prf->left_in_block > output_length )
|
|
length = (uint8_t) output_length;
|
|
else
|
|
length = tls12_prf->left_in_block;
|
|
|
|
offset = hash_length - tls12_prf->left_in_block;
|
|
memcpy( output, tls12_prf->output_block + offset, length );
|
|
output += length;
|
|
output_length -= length;
|
|
tls12_prf->left_in_block -= length;
|
|
}
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
#endif /* MBEDTLS_MD_C */
|
|
|
|
psa_status_t psa_key_derivation_output_bytes(
|
|
psa_key_derivation_operation_t *operation,
|
|
uint8_t *output,
|
|
size_t output_length )
|
|
{
|
|
psa_status_t status;
|
|
psa_algorithm_t kdf_alg = psa_key_derivation_get_kdf_alg( operation );
|
|
|
|
if( operation->alg == 0 )
|
|
{
|
|
/* This is a blank operation. */
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( output_length > operation->capacity )
|
|
{
|
|
operation->capacity = 0;
|
|
/* Go through the error path to wipe all confidential data now
|
|
* that the operation object is useless. */
|
|
status = PSA_ERROR_INSUFFICIENT_DATA;
|
|
goto exit;
|
|
}
|
|
if( output_length == 0 && operation->capacity == 0 )
|
|
{
|
|
/* Edge case: this is a finished operation, and 0 bytes
|
|
* were requested. The right error in this case could
|
|
* be either INSUFFICIENT_CAPACITY or BAD_STATE. Return
|
|
* INSUFFICIENT_CAPACITY, which is right for a finished
|
|
* operation, for consistency with the case when
|
|
* output_length > 0. */
|
|
return( PSA_ERROR_INSUFFICIENT_DATA );
|
|
}
|
|
operation->capacity -= output_length;
|
|
|
|
#if defined(MBEDTLS_MD_C)
|
|
if( PSA_ALG_IS_HKDF( kdf_alg ) )
|
|
{
|
|
psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( kdf_alg );
|
|
status = psa_key_derivation_hkdf_read( &operation->ctx.hkdf, hash_alg,
|
|
output, output_length );
|
|
}
|
|
else
|
|
if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
|
|
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
|
|
{
|
|
status = psa_key_derivation_tls12_prf_read( &operation->ctx.tls12_prf,
|
|
kdf_alg, output,
|
|
output_length );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_MD_C */
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
/* Preserve the algorithm upon errors, but clear all sensitive state.
|
|
* This allows us to differentiate between exhausted operations and
|
|
* blank operations, so we can return PSA_ERROR_BAD_STATE on blank
|
|
* operations. */
|
|
psa_algorithm_t alg = operation->alg;
|
|
psa_key_derivation_abort( operation );
|
|
operation->alg = alg;
|
|
memset( output, '!', output_length );
|
|
}
|
|
return( status );
|
|
}
|
|
|
|
#if defined(MBEDTLS_DES_C)
|
|
static void psa_des_set_key_parity( uint8_t *data, size_t data_size )
|
|
{
|
|
if( data_size >= 8 )
|
|
mbedtls_des_key_set_parity( data );
|
|
if( data_size >= 16 )
|
|
mbedtls_des_key_set_parity( data + 8 );
|
|
if( data_size >= 24 )
|
|
mbedtls_des_key_set_parity( data + 16 );
|
|
}
|
|
#endif /* MBEDTLS_DES_C */
|
|
|
|
static psa_status_t psa_generate_derived_key_internal(
|
|
psa_key_slot_t *slot,
|
|
size_t bits,
|
|
psa_key_derivation_operation_t *operation )
|
|
{
|
|
uint8_t *data = NULL;
|
|
size_t bytes = PSA_BITS_TO_BYTES( bits );
|
|
psa_status_t status;
|
|
|
|
if( ! key_type_is_raw_bytes( slot->attr.type ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
if( bits % 8 != 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
data = mbedtls_calloc( 1, bytes );
|
|
if( data == NULL )
|
|
return( PSA_ERROR_INSUFFICIENT_MEMORY );
|
|
|
|
status = psa_key_derivation_output_bytes( operation, data, bytes );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
#if defined(MBEDTLS_DES_C)
|
|
if( slot->attr.type == PSA_KEY_TYPE_DES )
|
|
psa_des_set_key_parity( data, bytes );
|
|
#endif /* MBEDTLS_DES_C */
|
|
status = psa_import_key_into_slot( slot, data, bytes );
|
|
|
|
exit:
|
|
mbedtls_free( data );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_key_derivation_output_key( const psa_key_attributes_t *attributes,
|
|
psa_key_derivation_operation_t *operation,
|
|
mbedtls_svc_key_id_t *key )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_slot_t *slot = NULL;
|
|
psa_se_drv_table_entry_t *driver = NULL;
|
|
|
|
/* Reject any attempt to create a zero-length key so that we don't
|
|
* risk tripping up later, e.g. on a malloc(0) that returns NULL. */
|
|
if( psa_get_key_bits( attributes ) == 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
if( ! operation->can_output_key )
|
|
return( PSA_ERROR_NOT_PERMITTED );
|
|
|
|
status = psa_start_key_creation( PSA_KEY_CREATION_DERIVE,
|
|
attributes, key, &slot, &driver );
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
if( driver != NULL )
|
|
{
|
|
/* Deriving a key in a secure element is not implemented yet. */
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
status = psa_generate_derived_key_internal( slot,
|
|
attributes->core.bits,
|
|
operation );
|
|
}
|
|
if( status == PSA_SUCCESS )
|
|
status = psa_finish_key_creation( slot, driver );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
psa_fail_key_creation( slot, driver );
|
|
*key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
}
|
|
return( status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Key derivation */
|
|
/****************************************************************/
|
|
|
|
static psa_status_t psa_key_derivation_setup_kdf(
|
|
psa_key_derivation_operation_t *operation,
|
|
psa_algorithm_t kdf_alg )
|
|
{
|
|
/* Make sure that operation->ctx is properly zero-initialised. (Macro
|
|
* initialisers for this union leave some bytes unspecified.) */
|
|
memset( &operation->ctx, 0, sizeof( operation->ctx ) );
|
|
|
|
/* Make sure that kdf_alg is a supported key derivation algorithm. */
|
|
#if defined(MBEDTLS_MD_C)
|
|
if( PSA_ALG_IS_HKDF( kdf_alg ) ||
|
|
PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
|
|
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
|
|
{
|
|
psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( kdf_alg );
|
|
size_t hash_size = PSA_HASH_SIZE( hash_alg );
|
|
if( hash_size == 0 )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
if( ( PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
|
|
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) ) &&
|
|
! ( hash_alg == PSA_ALG_SHA_256 || hash_alg == PSA_ALG_SHA_384 ) )
|
|
{
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
operation->capacity = 255 * hash_size;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
#endif /* MBEDTLS_MD_C */
|
|
else
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
psa_status_t psa_key_derivation_setup( psa_key_derivation_operation_t *operation,
|
|
psa_algorithm_t alg )
|
|
{
|
|
psa_status_t status;
|
|
|
|
if( operation->alg != 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( PSA_ALG_IS_RAW_KEY_AGREEMENT( alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
else if( PSA_ALG_IS_KEY_AGREEMENT( alg ) )
|
|
{
|
|
psa_algorithm_t kdf_alg = PSA_ALG_KEY_AGREEMENT_GET_KDF( alg );
|
|
status = psa_key_derivation_setup_kdf( operation, kdf_alg );
|
|
}
|
|
else if( PSA_ALG_IS_KEY_DERIVATION( alg ) )
|
|
{
|
|
status = psa_key_derivation_setup_kdf( operation, alg );
|
|
}
|
|
else
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
if( status == PSA_SUCCESS )
|
|
operation->alg = alg;
|
|
return( status );
|
|
}
|
|
|
|
#if defined(MBEDTLS_MD_C)
|
|
static psa_status_t psa_hkdf_input( psa_hkdf_key_derivation_t *hkdf,
|
|
psa_algorithm_t hash_alg,
|
|
psa_key_derivation_step_t step,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
psa_status_t status;
|
|
switch( step )
|
|
{
|
|
case PSA_KEY_DERIVATION_INPUT_SALT:
|
|
if( hkdf->state != HKDF_STATE_INIT )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
status = psa_hmac_setup_internal( &hkdf->hmac,
|
|
data, data_length,
|
|
hash_alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
hkdf->state = HKDF_STATE_STARTED;
|
|
return( PSA_SUCCESS );
|
|
case PSA_KEY_DERIVATION_INPUT_SECRET:
|
|
/* If no salt was provided, use an empty salt. */
|
|
if( hkdf->state == HKDF_STATE_INIT )
|
|
{
|
|
status = psa_hmac_setup_internal( &hkdf->hmac,
|
|
NULL, 0,
|
|
hash_alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
hkdf->state = HKDF_STATE_STARTED;
|
|
}
|
|
if( hkdf->state != HKDF_STATE_STARTED )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
status = psa_hash_update( &hkdf->hmac.hash_ctx,
|
|
data, data_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
status = psa_hmac_finish_internal( &hkdf->hmac,
|
|
hkdf->prk,
|
|
sizeof( hkdf->prk ) );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
hkdf->offset_in_block = PSA_HASH_SIZE( hash_alg );
|
|
hkdf->block_number = 0;
|
|
hkdf->state = HKDF_STATE_KEYED;
|
|
return( PSA_SUCCESS );
|
|
case PSA_KEY_DERIVATION_INPUT_INFO:
|
|
if( hkdf->state == HKDF_STATE_OUTPUT )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
if( hkdf->info_set )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
hkdf->info_length = data_length;
|
|
if( data_length != 0 )
|
|
{
|
|
hkdf->info = mbedtls_calloc( 1, data_length );
|
|
if( hkdf->info == NULL )
|
|
return( PSA_ERROR_INSUFFICIENT_MEMORY );
|
|
memcpy( hkdf->info, data, data_length );
|
|
}
|
|
hkdf->info_set = 1;
|
|
return( PSA_SUCCESS );
|
|
default:
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
}
|
|
|
|
static psa_status_t psa_tls12_prf_set_seed( psa_tls12_prf_key_derivation_t *prf,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
if( prf->state != TLS12_PRF_STATE_INIT )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( data_length != 0 )
|
|
{
|
|
prf->seed = mbedtls_calloc( 1, data_length );
|
|
if( prf->seed == NULL )
|
|
return( PSA_ERROR_INSUFFICIENT_MEMORY );
|
|
|
|
memcpy( prf->seed, data, data_length );
|
|
prf->seed_length = data_length;
|
|
}
|
|
|
|
prf->state = TLS12_PRF_STATE_SEED_SET;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
static psa_status_t psa_tls12_prf_set_key( psa_tls12_prf_key_derivation_t *prf,
|
|
psa_algorithm_t hash_alg,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
psa_status_t status;
|
|
if( prf->state != TLS12_PRF_STATE_SEED_SET )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
status = psa_hmac_setup_internal( &prf->hmac, data, data_length, hash_alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
prf->state = TLS12_PRF_STATE_KEY_SET;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
static psa_status_t psa_tls12_prf_psk_to_ms_set_key(
|
|
psa_tls12_prf_key_derivation_t *prf,
|
|
psa_algorithm_t hash_alg,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
psa_status_t status;
|
|
uint8_t pms[ 4 + 2 * PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN ];
|
|
uint8_t *cur = pms;
|
|
|
|
if( data_length > PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
/* Quoting RFC 4279, Section 2:
|
|
*
|
|
* The premaster secret is formed as follows: if the PSK is N octets
|
|
* long, concatenate a uint16 with the value N, N zero octets, a second
|
|
* uint16 with the value N, and the PSK itself.
|
|
*/
|
|
|
|
*cur++ = ( data_length >> 8 ) & 0xff;
|
|
*cur++ = ( data_length >> 0 ) & 0xff;
|
|
memset( cur, 0, data_length );
|
|
cur += data_length;
|
|
*cur++ = pms[0];
|
|
*cur++ = pms[1];
|
|
memcpy( cur, data, data_length );
|
|
cur += data_length;
|
|
|
|
status = psa_tls12_prf_set_key( prf, hash_alg, pms, cur - pms );
|
|
|
|
mbedtls_platform_zeroize( pms, sizeof( pms ) );
|
|
return( status );
|
|
}
|
|
|
|
static psa_status_t psa_tls12_prf_set_label( psa_tls12_prf_key_derivation_t *prf,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
if( prf->state != TLS12_PRF_STATE_KEY_SET )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( data_length != 0 )
|
|
{
|
|
prf->label = mbedtls_calloc( 1, data_length );
|
|
if( prf->label == NULL )
|
|
return( PSA_ERROR_INSUFFICIENT_MEMORY );
|
|
|
|
memcpy( prf->label, data, data_length );
|
|
prf->label_length = data_length;
|
|
}
|
|
|
|
prf->state = TLS12_PRF_STATE_LABEL_SET;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
static psa_status_t psa_tls12_prf_input( psa_tls12_prf_key_derivation_t *prf,
|
|
psa_algorithm_t hash_alg,
|
|
psa_key_derivation_step_t step,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
switch( step )
|
|
{
|
|
case PSA_KEY_DERIVATION_INPUT_SEED:
|
|
return( psa_tls12_prf_set_seed( prf, data, data_length ) );
|
|
case PSA_KEY_DERIVATION_INPUT_SECRET:
|
|
return( psa_tls12_prf_set_key( prf, hash_alg, data, data_length ) );
|
|
case PSA_KEY_DERIVATION_INPUT_LABEL:
|
|
return( psa_tls12_prf_set_label( prf, data, data_length ) );
|
|
default:
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
}
|
|
|
|
static psa_status_t psa_tls12_prf_psk_to_ms_input(
|
|
psa_tls12_prf_key_derivation_t *prf,
|
|
psa_algorithm_t hash_alg,
|
|
psa_key_derivation_step_t step,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
if( step == PSA_KEY_DERIVATION_INPUT_SECRET )
|
|
{
|
|
return( psa_tls12_prf_psk_to_ms_set_key( prf, hash_alg,
|
|
data, data_length ) );
|
|
}
|
|
|
|
return( psa_tls12_prf_input( prf, hash_alg, step, data, data_length ) );
|
|
}
|
|
#endif /* MBEDTLS_MD_C */
|
|
|
|
/** Check whether the given key type is acceptable for the given
|
|
* input step of a key derivation.
|
|
*
|
|
* Secret inputs must have the type #PSA_KEY_TYPE_DERIVE.
|
|
* Non-secret inputs must have the type #PSA_KEY_TYPE_RAW_DATA.
|
|
* Both secret and non-secret inputs can alternatively have the type
|
|
* #PSA_KEY_TYPE_NONE, which is never the type of a key object, meaning
|
|
* that the input was passed as a buffer rather than via a key object.
|
|
*/
|
|
static int psa_key_derivation_check_input_type(
|
|
psa_key_derivation_step_t step,
|
|
psa_key_type_t key_type )
|
|
{
|
|
switch( step )
|
|
{
|
|
case PSA_KEY_DERIVATION_INPUT_SECRET:
|
|
if( key_type == PSA_KEY_TYPE_DERIVE )
|
|
return( PSA_SUCCESS );
|
|
if( key_type == PSA_KEY_TYPE_NONE )
|
|
return( PSA_SUCCESS );
|
|
break;
|
|
case PSA_KEY_DERIVATION_INPUT_LABEL:
|
|
case PSA_KEY_DERIVATION_INPUT_SALT:
|
|
case PSA_KEY_DERIVATION_INPUT_INFO:
|
|
case PSA_KEY_DERIVATION_INPUT_SEED:
|
|
if( key_type == PSA_KEY_TYPE_RAW_DATA )
|
|
return( PSA_SUCCESS );
|
|
if( key_type == PSA_KEY_TYPE_NONE )
|
|
return( PSA_SUCCESS );
|
|
break;
|
|
}
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
|
|
static psa_status_t psa_key_derivation_input_internal(
|
|
psa_key_derivation_operation_t *operation,
|
|
psa_key_derivation_step_t step,
|
|
psa_key_type_t key_type,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
psa_status_t status;
|
|
psa_algorithm_t kdf_alg = psa_key_derivation_get_kdf_alg( operation );
|
|
|
|
status = psa_key_derivation_check_input_type( step, key_type );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
#if defined(MBEDTLS_MD_C)
|
|
if( PSA_ALG_IS_HKDF( kdf_alg ) )
|
|
{
|
|
status = psa_hkdf_input( &operation->ctx.hkdf,
|
|
PSA_ALG_HKDF_GET_HASH( kdf_alg ),
|
|
step, data, data_length );
|
|
}
|
|
else if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) )
|
|
{
|
|
status = psa_tls12_prf_input( &operation->ctx.tls12_prf,
|
|
PSA_ALG_HKDF_GET_HASH( kdf_alg ),
|
|
step, data, data_length );
|
|
}
|
|
else if( PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
|
|
{
|
|
status = psa_tls12_prf_psk_to_ms_input( &operation->ctx.tls12_prf,
|
|
PSA_ALG_HKDF_GET_HASH( kdf_alg ),
|
|
step, data, data_length );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_MD_C */
|
|
{
|
|
/* This can't happen unless the operation object was not initialized */
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
psa_key_derivation_abort( operation );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_key_derivation_input_bytes(
|
|
psa_key_derivation_operation_t *operation,
|
|
psa_key_derivation_step_t step,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
return( psa_key_derivation_input_internal( operation, step,
|
|
PSA_KEY_TYPE_NONE,
|
|
data, data_length ) );
|
|
}
|
|
|
|
psa_status_t psa_key_derivation_input_key(
|
|
psa_key_derivation_operation_t *operation,
|
|
psa_key_derivation_step_t step,
|
|
mbedtls_svc_key_id_t key )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
|
|
status = psa_get_transparent_key( key, &slot,
|
|
PSA_KEY_USAGE_DERIVE, operation->alg );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
psa_key_derivation_abort( operation );
|
|
return( status );
|
|
}
|
|
|
|
/* Passing a key object as a SECRET input unlocks the permission
|
|
* to output to a key object. */
|
|
if( step == PSA_KEY_DERIVATION_INPUT_SECRET )
|
|
operation->can_output_key = 1;
|
|
|
|
return( psa_key_derivation_input_internal( operation,
|
|
step, slot->attr.type,
|
|
slot->data.key.data,
|
|
slot->data.key.bytes ) );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Key agreement */
|
|
/****************************************************************/
|
|
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
static psa_status_t psa_key_agreement_ecdh( const uint8_t *peer_key,
|
|
size_t peer_key_length,
|
|
const mbedtls_ecp_keypair *our_key,
|
|
uint8_t *shared_secret,
|
|
size_t shared_secret_size,
|
|
size_t *shared_secret_length )
|
|
{
|
|
mbedtls_ecp_keypair *their_key = NULL;
|
|
mbedtls_ecdh_context ecdh;
|
|
psa_status_t status;
|
|
size_t bits = 0;
|
|
psa_ecc_family_t curve = mbedtls_ecc_group_to_psa( our_key->grp.id, &bits );
|
|
mbedtls_ecdh_init( &ecdh );
|
|
|
|
status = psa_load_ecp_representation( PSA_KEY_TYPE_ECC_PUBLIC_KEY(curve),
|
|
peer_key,
|
|
peer_key_length,
|
|
&their_key );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecdh_get_params( &ecdh, their_key, MBEDTLS_ECDH_THEIRS ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecdh_get_params( &ecdh, our_key, MBEDTLS_ECDH_OURS ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecdh_calc_secret( &ecdh,
|
|
shared_secret_length,
|
|
shared_secret, shared_secret_size,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
if( PSA_BITS_TO_BYTES( bits ) != *shared_secret_length )
|
|
status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
mbedtls_platform_zeroize( shared_secret, shared_secret_size );
|
|
mbedtls_ecdh_free( &ecdh );
|
|
mbedtls_ecp_keypair_free( their_key );
|
|
mbedtls_free( their_key );
|
|
|
|
return( status );
|
|
}
|
|
#endif /* MBEDTLS_ECDH_C */
|
|
|
|
#define PSA_KEY_AGREEMENT_MAX_SHARED_SECRET_SIZE MBEDTLS_ECP_MAX_BYTES
|
|
|
|
static psa_status_t psa_key_agreement_raw_internal( psa_algorithm_t alg,
|
|
psa_key_slot_t *private_key,
|
|
const uint8_t *peer_key,
|
|
size_t peer_key_length,
|
|
uint8_t *shared_secret,
|
|
size_t shared_secret_size,
|
|
size_t *shared_secret_length )
|
|
{
|
|
switch( alg )
|
|
{
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
case PSA_ALG_ECDH:
|
|
if( ! PSA_KEY_TYPE_IS_ECC_KEY_PAIR( private_key->attr.type ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
mbedtls_ecp_keypair *ecp = NULL;
|
|
psa_status_t status = psa_load_ecp_representation(
|
|
private_key->attr.type,
|
|
private_key->data.key.data,
|
|
private_key->data.key.bytes,
|
|
&ecp );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
status = psa_key_agreement_ecdh( peer_key, peer_key_length,
|
|
ecp,
|
|
shared_secret, shared_secret_size,
|
|
shared_secret_length );
|
|
mbedtls_ecp_keypair_free( ecp );
|
|
mbedtls_free( ecp );
|
|
return( status );
|
|
#endif /* MBEDTLS_ECDH_C */
|
|
default:
|
|
(void) private_key;
|
|
(void) peer_key;
|
|
(void) peer_key_length;
|
|
(void) shared_secret;
|
|
(void) shared_secret_size;
|
|
(void) shared_secret_length;
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
}
|
|
|
|
/* Note that if this function fails, you must call psa_key_derivation_abort()
|
|
* to potentially free embedded data structures and wipe confidential data.
|
|
*/
|
|
static psa_status_t psa_key_agreement_internal( psa_key_derivation_operation_t *operation,
|
|
psa_key_derivation_step_t step,
|
|
psa_key_slot_t *private_key,
|
|
const uint8_t *peer_key,
|
|
size_t peer_key_length )
|
|
{
|
|
psa_status_t status;
|
|
uint8_t shared_secret[PSA_KEY_AGREEMENT_MAX_SHARED_SECRET_SIZE];
|
|
size_t shared_secret_length = 0;
|
|
psa_algorithm_t ka_alg = PSA_ALG_KEY_AGREEMENT_GET_BASE( operation->alg );
|
|
|
|
/* Step 1: run the secret agreement algorithm to generate the shared
|
|
* secret. */
|
|
status = psa_key_agreement_raw_internal( ka_alg,
|
|
private_key,
|
|
peer_key, peer_key_length,
|
|
shared_secret,
|
|
sizeof( shared_secret ),
|
|
&shared_secret_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* Step 2: set up the key derivation to generate key material from
|
|
* the shared secret. A shared secret is permitted wherever a key
|
|
* of type DERIVE is permitted. */
|
|
status = psa_key_derivation_input_internal( operation, step,
|
|
PSA_KEY_TYPE_DERIVE,
|
|
shared_secret,
|
|
shared_secret_length );
|
|
exit:
|
|
mbedtls_platform_zeroize( shared_secret, shared_secret_length );
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_key_derivation_key_agreement( psa_key_derivation_operation_t *operation,
|
|
psa_key_derivation_step_t step,
|
|
mbedtls_svc_key_id_t private_key,
|
|
const uint8_t *peer_key,
|
|
size_t peer_key_length )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
if( ! PSA_ALG_IS_KEY_AGREEMENT( operation->alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
status = psa_get_transparent_key( private_key, &slot,
|
|
PSA_KEY_USAGE_DERIVE, operation->alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
status = psa_key_agreement_internal( operation, step,
|
|
slot,
|
|
peer_key, peer_key_length );
|
|
if( status != PSA_SUCCESS )
|
|
psa_key_derivation_abort( operation );
|
|
else
|
|
{
|
|
/* If a private key has been added as SECRET, we allow the derived
|
|
* key material to be used as a key in PSA Crypto. */
|
|
if( step == PSA_KEY_DERIVATION_INPUT_SECRET )
|
|
operation->can_output_key = 1;
|
|
}
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_raw_key_agreement( psa_algorithm_t alg,
|
|
mbedtls_svc_key_id_t private_key,
|
|
const uint8_t *peer_key,
|
|
size_t peer_key_length,
|
|
uint8_t *output,
|
|
size_t output_size,
|
|
size_t *output_length )
|
|
{
|
|
psa_key_slot_t *slot;
|
|
psa_status_t status;
|
|
|
|
if( ! PSA_ALG_IS_KEY_AGREEMENT( alg ) )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
status = psa_get_transparent_key( private_key, &slot,
|
|
PSA_KEY_USAGE_DERIVE, alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_key_agreement_raw_internal( alg, slot,
|
|
peer_key, peer_key_length,
|
|
output, output_size,
|
|
output_length );
|
|
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
/* If an error happens and is not handled properly, the output
|
|
* may be used as a key to protect sensitive data. Arrange for such
|
|
* a key to be random, which is likely to result in decryption or
|
|
* verification errors. This is better than filling the buffer with
|
|
* some constant data such as zeros, which would result in the data
|
|
* being protected with a reproducible, easily knowable key.
|
|
*/
|
|
psa_generate_random( output, output_size );
|
|
*output_length = output_size;
|
|
}
|
|
return( status );
|
|
}
|
|
|
|
|
|
/****************************************************************/
|
|
/* Random generation */
|
|
/****************************************************************/
|
|
|
|
psa_status_t psa_generate_random( uint8_t *output,
|
|
size_t output_size )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
GUARD_MODULE_INITIALIZED;
|
|
|
|
while( output_size > MBEDTLS_CTR_DRBG_MAX_REQUEST )
|
|
{
|
|
ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg,
|
|
output,
|
|
MBEDTLS_CTR_DRBG_MAX_REQUEST );
|
|
if( ret != 0 )
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
output += MBEDTLS_CTR_DRBG_MAX_REQUEST;
|
|
output_size -= MBEDTLS_CTR_DRBG_MAX_REQUEST;
|
|
}
|
|
|
|
ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg, output, output_size );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_INJECT_ENTROPY)
|
|
#include "mbedtls/entropy_poll.h"
|
|
|
|
psa_status_t mbedtls_psa_inject_entropy( const uint8_t *seed,
|
|
size_t seed_size )
|
|
{
|
|
if( global_data.initialized )
|
|
return( PSA_ERROR_NOT_PERMITTED );
|
|
|
|
if( ( ( seed_size < MBEDTLS_ENTROPY_MIN_PLATFORM ) ||
|
|
( seed_size < MBEDTLS_ENTROPY_BLOCK_SIZE ) ) ||
|
|
( seed_size > MBEDTLS_ENTROPY_MAX_SEED_SIZE ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
return( mbedtls_psa_storage_inject_entropy( seed, seed_size ) );
|
|
}
|
|
#endif /* MBEDTLS_PSA_INJECT_ENTROPY */
|
|
|
|
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
|
|
static psa_status_t psa_read_rsa_exponent( const uint8_t *domain_parameters,
|
|
size_t domain_parameters_size,
|
|
int *exponent )
|
|
{
|
|
size_t i;
|
|
uint32_t acc = 0;
|
|
|
|
if( domain_parameters_size == 0 )
|
|
{
|
|
*exponent = 65537;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/* Mbed TLS encodes the public exponent as an int. For simplicity, only
|
|
* support values that fit in a 32-bit integer, which is larger than
|
|
* int on just about every platform anyway. */
|
|
if( domain_parameters_size > sizeof( acc ) )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
for( i = 0; i < domain_parameters_size; i++ )
|
|
acc = ( acc << 8 ) | domain_parameters[i];
|
|
if( acc > INT_MAX )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
*exponent = acc;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
#endif /* MBEDTLS_RSA_C && MBEDTLS_GENPRIME */
|
|
|
|
static psa_status_t psa_generate_key_internal(
|
|
psa_key_slot_t *slot, size_t bits,
|
|
const uint8_t *domain_parameters, size_t domain_parameters_size )
|
|
{
|
|
psa_key_type_t type = slot->attr.type;
|
|
|
|
if( domain_parameters == NULL && domain_parameters_size != 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
if( key_type_is_raw_bytes( type ) )
|
|
{
|
|
psa_status_t status;
|
|
|
|
status = validate_unstructured_key_bit_size( slot->attr.type, bits );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
/* Allocate memory for the key */
|
|
status = psa_allocate_buffer_to_slot( slot, PSA_BITS_TO_BYTES( bits ) );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
status = psa_generate_random( slot->data.key.data,
|
|
slot->data.key.bytes );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
slot->attr.bits = (psa_key_bits_t) bits;
|
|
#if defined(MBEDTLS_DES_C)
|
|
if( type == PSA_KEY_TYPE_DES )
|
|
psa_des_set_key_parity( slot->data.key.data,
|
|
slot->data.key.bytes );
|
|
#endif /* MBEDTLS_DES_C */
|
|
}
|
|
else
|
|
|
|
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
|
|
if ( type == PSA_KEY_TYPE_RSA_KEY_PAIR )
|
|
{
|
|
mbedtls_rsa_context rsa;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
int exponent;
|
|
psa_status_t status;
|
|
if( bits > PSA_VENDOR_RSA_MAX_KEY_BITS )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
/* Accept only byte-aligned keys, for the same reasons as
|
|
* in psa_import_rsa_key(). */
|
|
if( bits % 8 != 0 )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
status = psa_read_rsa_exponent( domain_parameters,
|
|
domain_parameters_size,
|
|
&exponent );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
|
|
ret = mbedtls_rsa_gen_key( &rsa,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg,
|
|
(unsigned int) bits,
|
|
exponent );
|
|
if( ret != 0 )
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
|
|
/* Make sure to always have an export representation available */
|
|
size_t bytes = PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE( bits );
|
|
|
|
status = psa_allocate_buffer_to_slot( slot, bytes );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
mbedtls_rsa_free( &rsa );
|
|
return( status );
|
|
}
|
|
|
|
status = psa_export_rsa_key( type,
|
|
&rsa,
|
|
slot->data.key.data,
|
|
bytes,
|
|
&slot->data.key.bytes );
|
|
mbedtls_rsa_free( &rsa );
|
|
if( status != PSA_SUCCESS )
|
|
psa_remove_key_data_from_memory( slot );
|
|
return( status );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_RSA_C && MBEDTLS_GENPRIME */
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
if ( PSA_KEY_TYPE_IS_ECC( type ) && PSA_KEY_TYPE_IS_KEY_PAIR( type ) )
|
|
{
|
|
psa_ecc_family_t curve = PSA_KEY_TYPE_ECC_GET_FAMILY( type );
|
|
mbedtls_ecp_group_id grp_id =
|
|
mbedtls_ecc_group_of_psa( curve, PSA_BITS_TO_BYTES( bits ) );
|
|
const mbedtls_ecp_curve_info *curve_info =
|
|
mbedtls_ecp_curve_info_from_grp_id( grp_id );
|
|
mbedtls_ecp_keypair ecp;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
if( domain_parameters_size != 0 )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
if( grp_id == MBEDTLS_ECP_DP_NONE || curve_info == NULL )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
mbedtls_ecp_keypair_init( &ecp );
|
|
ret = mbedtls_ecp_gen_key( grp_id, &ecp,
|
|
mbedtls_ctr_drbg_random,
|
|
&global_data.ctr_drbg );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_ecp_keypair_free( &ecp );
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
|
|
|
|
/* Make sure to always have an export representation available */
|
|
size_t bytes = PSA_BITS_TO_BYTES( bits );
|
|
psa_status_t status = psa_allocate_buffer_to_slot( slot, bytes );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
mbedtls_ecp_keypair_free( &ecp );
|
|
return( status );
|
|
}
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecp_write_key( &ecp, slot->data.key.data, bytes ) );
|
|
|
|
mbedtls_ecp_keypair_free( &ecp );
|
|
if( status != PSA_SUCCESS ) {
|
|
memset( slot->data.key.data, 0, bytes );
|
|
psa_remove_key_data_from_memory( slot );
|
|
}
|
|
return( status );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_ECP_C */
|
|
{
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_generate_key( const psa_key_attributes_t *attributes,
|
|
mbedtls_svc_key_id_t *key )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_slot_t *slot = NULL;
|
|
psa_se_drv_table_entry_t *driver = NULL;
|
|
|
|
/* Reject any attempt to create a zero-length key so that we don't
|
|
* risk tripping up later, e.g. on a malloc(0) that returns NULL. */
|
|
if( psa_get_key_bits( attributes ) == 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
status = psa_start_key_creation( PSA_KEY_CREATION_GENERATE,
|
|
attributes, key, &slot, &driver );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_driver_wrapper_generate_key( attributes,
|
|
slot );
|
|
if( status != PSA_ERROR_NOT_SUPPORTED ||
|
|
psa_key_lifetime_is_external( attributes->core.lifetime ) )
|
|
goto exit;
|
|
|
|
status = psa_generate_key_internal(
|
|
slot, attributes->core.bits,
|
|
attributes->domain_parameters, attributes->domain_parameters_size );
|
|
|
|
exit:
|
|
if( status == PSA_SUCCESS )
|
|
status = psa_finish_key_creation( slot, driver );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
psa_fail_key_creation( slot, driver );
|
|
*key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
}
|
|
return( status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Module setup */
|
|
/****************************************************************/
|
|
|
|
psa_status_t mbedtls_psa_crypto_configure_entropy_sources(
|
|
void (* entropy_init )( mbedtls_entropy_context *ctx ),
|
|
void (* entropy_free )( mbedtls_entropy_context *ctx ) )
|
|
{
|
|
if( global_data.rng_state != RNG_NOT_INITIALIZED )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
global_data.entropy_init = entropy_init;
|
|
global_data.entropy_free = entropy_free;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
void mbedtls_psa_crypto_free( void )
|
|
{
|
|
psa_wipe_all_key_slots( );
|
|
if( global_data.rng_state != RNG_NOT_INITIALIZED )
|
|
{
|
|
mbedtls_ctr_drbg_free( &global_data.ctr_drbg );
|
|
global_data.entropy_free( &global_data.entropy );
|
|
}
|
|
/* Wipe all remaining data, including configuration.
|
|
* In particular, this sets all state indicator to the value
|
|
* indicating "uninitialized". */
|
|
mbedtls_platform_zeroize( &global_data, sizeof( global_data ) );
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
/* Unregister all secure element drivers, so that we restart from
|
|
* a pristine state. */
|
|
psa_unregister_all_se_drivers( );
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
}
|
|
|
|
#if defined(PSA_CRYPTO_STORAGE_HAS_TRANSACTIONS)
|
|
/** Recover a transaction that was interrupted by a power failure.
|
|
*
|
|
* This function is called during initialization, before psa_crypto_init()
|
|
* returns. If this function returns a failure status, the initialization
|
|
* fails.
|
|
*/
|
|
static psa_status_t psa_crypto_recover_transaction(
|
|
const psa_crypto_transaction_t *transaction )
|
|
{
|
|
switch( transaction->unknown.type )
|
|
{
|
|
case PSA_CRYPTO_TRANSACTION_CREATE_KEY:
|
|
case PSA_CRYPTO_TRANSACTION_DESTROY_KEY:
|
|
/* TODO - fall through to the failure case until this
|
|
* is implemented.
|
|
* https://github.com/ARMmbed/mbed-crypto/issues/218
|
|
*/
|
|
default:
|
|
/* We found an unsupported transaction in the storage.
|
|
* We don't know what state the storage is in. Give up. */
|
|
return( PSA_ERROR_STORAGE_FAILURE );
|
|
}
|
|
}
|
|
#endif /* PSA_CRYPTO_STORAGE_HAS_TRANSACTIONS */
|
|
|
|
psa_status_t psa_crypto_init( void )
|
|
{
|
|
psa_status_t status;
|
|
const unsigned char drbg_seed[] = "PSA";
|
|
|
|
/* Double initialization is explicitly allowed. */
|
|
if( global_data.initialized != 0 )
|
|
return( PSA_SUCCESS );
|
|
|
|
/* Set default configuration if
|
|
* mbedtls_psa_crypto_configure_entropy_sources() hasn't been called. */
|
|
if( global_data.entropy_init == NULL )
|
|
global_data.entropy_init = mbedtls_entropy_init;
|
|
if( global_data.entropy_free == NULL )
|
|
global_data.entropy_free = mbedtls_entropy_free;
|
|
|
|
/* Initialize the random generator. */
|
|
global_data.entropy_init( &global_data.entropy );
|
|
#if defined(MBEDTLS_PSA_INJECT_ENTROPY) && \
|
|
defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES)
|
|
/* The PSA entropy injection feature depends on using NV seed as an entropy
|
|
* source. Add NV seed as an entropy source for PSA entropy injection. */
|
|
mbedtls_entropy_add_source( &global_data.entropy,
|
|
mbedtls_nv_seed_poll, NULL,
|
|
MBEDTLS_ENTROPY_BLOCK_SIZE,
|
|
MBEDTLS_ENTROPY_SOURCE_STRONG );
|
|
#endif
|
|
mbedtls_ctr_drbg_init( &global_data.ctr_drbg );
|
|
global_data.rng_state = RNG_INITIALIZED;
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ctr_drbg_seed( &global_data.ctr_drbg,
|
|
mbedtls_entropy_func,
|
|
&global_data.entropy,
|
|
drbg_seed, sizeof( drbg_seed ) - 1 ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
global_data.rng_state = RNG_SEEDED;
|
|
|
|
status = psa_initialize_key_slots( );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
status = psa_init_all_se_drivers( );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
#if defined(PSA_CRYPTO_STORAGE_HAS_TRANSACTIONS)
|
|
status = psa_crypto_load_transaction( );
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
status = psa_crypto_recover_transaction( &psa_crypto_transaction );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
status = psa_crypto_stop_transaction( );
|
|
}
|
|
else if( status == PSA_ERROR_DOES_NOT_EXIST )
|
|
{
|
|
/* There's no transaction to complete. It's all good. */
|
|
status = PSA_SUCCESS;
|
|
}
|
|
#endif /* PSA_CRYPTO_STORAGE_HAS_TRANSACTIONS */
|
|
|
|
/* All done. */
|
|
global_data.initialized = 1;
|
|
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
mbedtls_psa_crypto_free( );
|
|
return( status );
|
|
}
|
|
|
|
#endif /* MBEDTLS_PSA_CRYPTO_C */
|