5478 lines
190 KiB
C
5478 lines
190 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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#if defined(MBEDTLS_PSA_CRYPTO_CONFIG)
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#include "check_crypto_config.h"
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#endif
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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_cipher.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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#include "psa_crypto_ecp.h"
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#include "psa_crypto_hash.h"
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#include "psa_crypto_mac.h"
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#include "psa_crypto_rsa.h"
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#include "psa_crypto_ecp.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 "psa_crypto_random_impl.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/aes.h"
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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/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 "md_wrap.h"
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#include "mbedtls/pk.h"
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#include "pk_wrap.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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/****************************************************************/
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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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mbedtls_psa_random_context_t rng;
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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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#if !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
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mbedtls_psa_drbg_context_t *const mbedtls_psa_random_state =
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&global_data.rng.drbg;
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#endif
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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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/* Mbed TLS error codes can combine a high-level error code and a
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* low-level error code. The low-level error usually reflects the
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* root cause better, so dispatch on that preferably. */
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int low_level_ret = - ( -ret & 0x007f );
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switch( low_level_ret != 0 ? low_level_ret : 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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return( PSA_ERROR_NOT_SUPPORTED );
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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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#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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#if defined(MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA)
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case MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA:
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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_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_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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#if !( defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) || \
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defined(MBEDTLS_PSA_HMAC_DRBG_MD_TYPE) )
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/* Only check CTR_DRBG error codes if underlying mbedtls_xxx
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* functions are passed a CTR_DRBG instance. */
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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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#endif
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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_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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#if !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) && \
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defined(MBEDTLS_PSA_HMAC_DRBG_MD_TYPE)
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/* Only check HMAC_DRBG error codes if underlying mbedtls_xxx
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* functions are passed a HMAC_DRBG instance. */
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case MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED:
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return( PSA_ERROR_INSUFFICIENT_ENTROPY );
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case MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG:
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case MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG:
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return( PSA_ERROR_NOT_SUPPORTED );
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case MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR:
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return( PSA_ERROR_INSUFFICIENT_ENTROPY );
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#endif
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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_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_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_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_ENTROPY );
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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_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_RANDOM_FAILED:
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return( PSA_ERROR_INSUFFICIENT_ENTROPY );
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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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/* For now the MBEDTLS_PSA_ACCEL_ guards are also used here since the
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* current test driver in key_management.c is using this function
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* when accelerators are used for ECC key pair and public key.
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* Once that dependency is resolved these guards can be removed.
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*/
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#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
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defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) || \
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defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_KEY_PAIR) || \
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defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_PUBLIC_KEY)
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mbedtls_ecp_group_id mbedtls_ecc_group_of_psa( psa_ecc_family_t curve,
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size_t bits,
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int bits_is_sloppy )
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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( bits )
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{
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#if defined(PSA_WANT_ECC_SECP_R1_192)
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case 192:
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return( MBEDTLS_ECP_DP_SECP192R1 );
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#endif
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#if defined(PSA_WANT_ECC_SECP_R1_224)
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case 224:
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return( MBEDTLS_ECP_DP_SECP224R1 );
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#endif
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#if defined(PSA_WANT_ECC_SECP_R1_256)
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case 256:
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return( MBEDTLS_ECP_DP_SECP256R1 );
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#endif
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#if defined(PSA_WANT_ECC_SECP_R1_384)
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case 384:
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return( MBEDTLS_ECP_DP_SECP384R1 );
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#endif
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#if defined(PSA_WANT_ECC_SECP_R1_521)
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case 521:
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return( MBEDTLS_ECP_DP_SECP521R1 );
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case 528:
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if( bits_is_sloppy )
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return( MBEDTLS_ECP_DP_SECP521R1 );
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break;
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#endif
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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( bits )
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{
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#if defined(PSA_WANT_ECC_BRAINPOOL_P_R1_256)
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case 256:
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return( MBEDTLS_ECP_DP_BP256R1 );
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#endif
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#if defined(PSA_WANT_ECC_BRAINPOOL_P_R1_384)
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case 384:
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return( MBEDTLS_ECP_DP_BP384R1 );
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#endif
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#if defined(PSA_WANT_ECC_BRAINPOOL_P_R1_512)
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case 512:
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return( MBEDTLS_ECP_DP_BP512R1 );
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#endif
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}
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break;
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case PSA_ECC_FAMILY_MONTGOMERY:
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switch( bits )
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{
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#if defined(PSA_WANT_ECC_MONTGOMERY_255)
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case 255:
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return( MBEDTLS_ECP_DP_CURVE25519 );
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case 256:
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if( bits_is_sloppy )
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return( MBEDTLS_ECP_DP_CURVE25519 );
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break;
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#endif
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#if defined(PSA_WANT_ECC_MONTGOMERY_448)
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case 448:
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return( MBEDTLS_ECP_DP_CURVE448 );
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#endif
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}
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break;
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case PSA_ECC_FAMILY_SECP_K1:
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switch( bits )
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{
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#if defined(PSA_WANT_ECC_SECP_K1_192)
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case 192:
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return( MBEDTLS_ECP_DP_SECP192K1 );
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#endif
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#if defined(PSA_WANT_ECC_SECP_K1_224)
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case 224:
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|
return( MBEDTLS_ECP_DP_SECP224K1 );
|
|
#endif
|
|
#if defined(PSA_WANT_ECC_SECP_K1_256)
|
|
case 256:
|
|
return( MBEDTLS_ECP_DP_SECP256K1 );
|
|
#endif
|
|
}
|
|
break;
|
|
}
|
|
|
|
(void) bits_is_sloppy;
|
|
return( MBEDTLS_ECP_DP_NONE );
|
|
}
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) ||
|
|
* defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_KEY_PAIR) ||
|
|
* defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_PUBLIC_KEY) */
|
|
|
|
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:
|
|
case PSA_KEY_TYPE_HMAC:
|
|
case PSA_KEY_TYPE_DERIVE:
|
|
break;
|
|
#if defined(PSA_WANT_KEY_TYPE_AES)
|
|
case PSA_KEY_TYPE_AES:
|
|
if( bits != 128 && bits != 192 && bits != 256 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
break;
|
|
#endif
|
|
#if defined(PSA_WANT_KEY_TYPE_CAMELLIA)
|
|
case PSA_KEY_TYPE_CAMELLIA:
|
|
if( bits != 128 && bits != 192 && bits != 256 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
break;
|
|
#endif
|
|
#if defined(PSA_WANT_KEY_TYPE_DES)
|
|
case PSA_KEY_TYPE_DES:
|
|
if( bits != 64 && bits != 128 && bits != 192 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
break;
|
|
#endif
|
|
#if defined(PSA_WANT_KEY_TYPE_ARC4)
|
|
case PSA_KEY_TYPE_ARC4:
|
|
if( bits < 8 || bits > 2048 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
break;
|
|
#endif
|
|
#if defined(PSA_WANT_KEY_TYPE_CHACHA20)
|
|
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 );
|
|
}
|
|
|
|
/** Check whether a given key type is valid for use with a given MAC algorithm
|
|
*
|
|
* Upon successful return of this function, the behavior of #PSA_MAC_LENGTH
|
|
* when called with the validated \p algorithm and \p key_type is well-defined.
|
|
*
|
|
* \param[in] algorithm The specific MAC algorithm (can be wildcard).
|
|
* \param[in] key_type The key type of the key to be used with the
|
|
* \p algorithm.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* The \p key_type is valid for use with the \p algorithm
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
* The \p key_type is not valid for use with the \p algorithm
|
|
*/
|
|
MBEDTLS_STATIC_TESTABLE psa_status_t psa_mac_key_can_do(
|
|
psa_algorithm_t algorithm,
|
|
psa_key_type_t key_type )
|
|
{
|
|
if( PSA_ALG_IS_HMAC( algorithm ) )
|
|
{
|
|
if( key_type == PSA_KEY_TYPE_HMAC )
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
if( PSA_ALG_IS_BLOCK_CIPHER_MAC( algorithm ) )
|
|
{
|
|
/* Check that we're calling PSA_BLOCK_CIPHER_BLOCK_LENGTH with a cipher
|
|
* key. */
|
|
if( ( key_type & PSA_KEY_TYPE_CATEGORY_MASK ) ==
|
|
PSA_KEY_TYPE_CATEGORY_SYMMETRIC )
|
|
{
|
|
/* PSA_BLOCK_CIPHER_BLOCK_LENGTH returns 1 for stream ciphers and
|
|
* the block length (larger than 1) for block ciphers. */
|
|
if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type ) > 1 )
|
|
return( PSA_SUCCESS );
|
|
}
|
|
}
|
|
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
|
|
psa_status_t psa_allocate_buffer_to_slot( psa_key_slot_t *slot,
|
|
size_t buffer_length )
|
|
{
|
|
if( slot->key.data != NULL )
|
|
return( PSA_ERROR_ALREADY_EXISTS );
|
|
|
|
slot->key.data = mbedtls_calloc( 1, buffer_length );
|
|
if( slot->key.data == NULL )
|
|
return( PSA_ERROR_INSUFFICIENT_MEMORY );
|
|
|
|
slot->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->key.data, data, data_length );
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_import_key_into_slot(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *data, size_t data_length,
|
|
uint8_t *key_buffer, size_t key_buffer_size,
|
|
size_t *key_buffer_length, size_t *bits )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_type_t type = attributes->core.type;
|
|
|
|
/* zero-length keys are never supported. */
|
|
if( data_length == 0 )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
if( key_type_is_raw_bytes( type ) )
|
|
{
|
|
*bits = 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( ( *bits ) > PSA_MAX_KEY_BITS )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
status = validate_unstructured_key_bit_size( type, *bits );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
/* Copy the key material. */
|
|
memcpy( key_buffer, data, data_length );
|
|
*key_buffer_length = data_length;
|
|
(void)key_buffer_size;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
else if( PSA_KEY_TYPE_IS_ASYMMETRIC( type ) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY)
|
|
if( PSA_KEY_TYPE_IS_ECC( type ) )
|
|
{
|
|
return( mbedtls_psa_ecp_import_key( attributes,
|
|
data, data_length,
|
|
key_buffer, key_buffer_size,
|
|
key_buffer_length,
|
|
bits ) );
|
|
}
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
|
|
if( PSA_KEY_TYPE_IS_RSA( type ) )
|
|
{
|
|
return( mbedtls_psa_rsa_import_key( attributes,
|
|
data, data_length,
|
|
key_buffer, key_buffer_size,
|
|
key_buffer_length,
|
|
bits ) );
|
|
}
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
|
|
}
|
|
|
|
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_key_type_t key_type,
|
|
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 from the same AEAD family, check whether
|
|
* one of them is a minimum-tag-length wildcard. Calculate the most
|
|
* restrictive tag length. */
|
|
if( PSA_ALG_IS_AEAD( alg1 ) && PSA_ALG_IS_AEAD( alg2 ) &&
|
|
( PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg1, 0 ) ==
|
|
PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg2, 0 ) ) )
|
|
{
|
|
size_t alg1_len = PSA_ALG_AEAD_GET_TAG_LENGTH( alg1 );
|
|
size_t alg2_len = PSA_ALG_AEAD_GET_TAG_LENGTH( alg2 );
|
|
size_t restricted_len = alg1_len > alg2_len ? alg1_len : alg2_len;
|
|
|
|
/* If both are wildcards, return most restrictive wildcard */
|
|
if( ( ( alg1 & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) &&
|
|
( ( alg2 & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) )
|
|
{
|
|
return( PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG(
|
|
alg1, restricted_len ) );
|
|
}
|
|
/* If only one is a wildcard, return specific algorithm if compatible. */
|
|
if( ( ( alg1 & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) &&
|
|
( alg1_len <= alg2_len ) )
|
|
{
|
|
return( alg2 );
|
|
}
|
|
if( ( ( alg2 & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) &&
|
|
( alg2_len <= alg1_len ) )
|
|
{
|
|
return( alg1 );
|
|
}
|
|
}
|
|
/* If the policies are from the same MAC family, check whether one
|
|
* of them is a minimum-MAC-length policy. Calculate the most
|
|
* restrictive tag length. */
|
|
if( PSA_ALG_IS_MAC( alg1 ) && PSA_ALG_IS_MAC( alg2 ) &&
|
|
( PSA_ALG_FULL_LENGTH_MAC( alg1 ) ==
|
|
PSA_ALG_FULL_LENGTH_MAC( alg2 ) ) )
|
|
{
|
|
/* Validate the combination of key type and algorithm. Since the base
|
|
* algorithm of alg1 and alg2 are the same, we only need this once. */
|
|
if( PSA_SUCCESS != psa_mac_key_can_do( alg1, key_type ) )
|
|
return( 0 );
|
|
|
|
/* Get the (exact or at-least) output lengths for both sides of the
|
|
* requested intersection. None of the currently supported algorithms
|
|
* have an output length dependent on the actual key size, so setting it
|
|
* to a bogus value of 0 is currently OK.
|
|
*
|
|
* Note that for at-least-this-length wildcard algorithms, the output
|
|
* length is set to the shortest allowed length, which allows us to
|
|
* calculate the most restrictive tag length for the intersection. */
|
|
size_t alg1_len = PSA_MAC_LENGTH( key_type, 0, alg1 );
|
|
size_t alg2_len = PSA_MAC_LENGTH( key_type, 0, alg2 );
|
|
size_t restricted_len = alg1_len > alg2_len ? alg1_len : alg2_len;
|
|
|
|
/* If both are wildcards, return most restrictive wildcard */
|
|
if( ( ( alg1 & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) &&
|
|
( ( alg2 & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) )
|
|
{
|
|
return( PSA_ALG_AT_LEAST_THIS_LENGTH_MAC( alg1, restricted_len ) );
|
|
}
|
|
|
|
/* If only one is an at-least-this-length policy, the intersection would
|
|
* be the other (fixed-length) policy as long as said fixed length is
|
|
* equal to or larger than the shortest allowed length. */
|
|
if( ( alg1 & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 )
|
|
{
|
|
return( ( alg1_len <= alg2_len ) ? alg2 : 0 );
|
|
}
|
|
if( ( alg2 & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 )
|
|
{
|
|
return( ( alg2_len <= alg1_len ) ? alg1 : 0 );
|
|
}
|
|
|
|
/* If none of them are wildcards, check whether they define the same tag
|
|
* length. This is still possible here when one is default-length and
|
|
* the other specific-length. Ensure to always return the
|
|
* specific-length version for the intersection. */
|
|
if( alg1_len == alg2_len )
|
|
return( PSA_ALG_TRUNCATED_MAC( alg1, alg1_len ) );
|
|
}
|
|
/* If the policies are incompatible, allow nothing. */
|
|
return( 0 );
|
|
}
|
|
|
|
static int psa_key_algorithm_permits( psa_key_type_t key_type,
|
|
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 wildcard AEAD algorithm of the same base as
|
|
* the requested algorithm, check the requested tag length to be
|
|
* equal-length or longer than the wildcard-specified length. */
|
|
if( PSA_ALG_IS_AEAD( policy_alg ) &&
|
|
PSA_ALG_IS_AEAD( requested_alg ) &&
|
|
( PSA_ALG_AEAD_WITH_SHORTENED_TAG( policy_alg, 0 ) ==
|
|
PSA_ALG_AEAD_WITH_SHORTENED_TAG( requested_alg, 0 ) ) &&
|
|
( ( policy_alg & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) )
|
|
{
|
|
return( PSA_ALG_AEAD_GET_TAG_LENGTH( policy_alg ) <=
|
|
PSA_ALG_AEAD_GET_TAG_LENGTH( requested_alg ) );
|
|
}
|
|
/* If policy_alg is a MAC algorithm of the same base as the requested
|
|
* algorithm, check whether their MAC lengths are compatible. */
|
|
if( PSA_ALG_IS_MAC( policy_alg ) &&
|
|
PSA_ALG_IS_MAC( requested_alg ) &&
|
|
( PSA_ALG_FULL_LENGTH_MAC( policy_alg ) ==
|
|
PSA_ALG_FULL_LENGTH_MAC( requested_alg ) ) )
|
|
{
|
|
/* Validate the combination of key type and algorithm. Since the policy
|
|
* and requested algorithms are the same, we only need this once. */
|
|
if( PSA_SUCCESS != psa_mac_key_can_do( policy_alg, key_type ) )
|
|
return( 0 );
|
|
|
|
/* Get both the requested output length for the algorithm which is to be
|
|
* verified, and the default output length for the base algorithm.
|
|
* Note that none of the currently supported algorithms have an output
|
|
* length dependent on actual key size, so setting it to a bogus value
|
|
* of 0 is currently OK. */
|
|
size_t requested_output_length = PSA_MAC_LENGTH(
|
|
key_type, 0, requested_alg );
|
|
size_t default_output_length = PSA_MAC_LENGTH(
|
|
key_type, 0,
|
|
PSA_ALG_FULL_LENGTH_MAC( requested_alg ) );
|
|
|
|
/* If the policy is default-length, only allow an algorithm with
|
|
* a declared exact-length matching the default. */
|
|
if( PSA_MAC_TRUNCATED_LENGTH( policy_alg ) == 0 )
|
|
return( requested_output_length == default_output_length );
|
|
|
|
/* If the requested algorithm is default-length, allow it if the policy
|
|
* length exactly matches the default length. */
|
|
if( PSA_MAC_TRUNCATED_LENGTH( requested_alg ) == 0 &&
|
|
PSA_MAC_TRUNCATED_LENGTH( policy_alg ) == default_output_length )
|
|
{
|
|
return( 1 );
|
|
}
|
|
|
|
/* If policy_alg is an at-least-this-length wildcard MAC algorithm,
|
|
* check for the requested MAC length to be equal to or longer than the
|
|
* minimum allowed length. */
|
|
if( ( policy_alg & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 )
|
|
{
|
|
return( PSA_MAC_TRUNCATED_LENGTH( policy_alg ) <=
|
|
requested_output_length );
|
|
}
|
|
}
|
|
/* 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 explicitly permitted, it's forbidden. */
|
|
return( 0 );
|
|
}
|
|
|
|
/** Test whether a policy permits an algorithm.
|
|
*
|
|
* The caller must test usage flags separately.
|
|
*
|
|
* \note This function requires providing the key type for which the policy is
|
|
* being validated, since some algorithm policy definitions (e.g. MAC)
|
|
* have different properties depending on what kind of cipher it is
|
|
* combined with.
|
|
*
|
|
* \retval PSA_SUCCESS When \p alg is a specific algorithm
|
|
* allowed by the \p policy.
|
|
* \retval PSA_ERROR_INVALID_ARGUMENT When \p alg is not a specific algorithm
|
|
* \retval PSA_ERROR_NOT_PERMITTED When \p alg is a specific algorithm, but
|
|
* the \p policy does not allow it.
|
|
*/
|
|
static psa_status_t psa_key_policy_permits( const psa_key_policy_t *policy,
|
|
psa_key_type_t key_type,
|
|
psa_algorithm_t alg )
|
|
{
|
|
/* '0' is not a valid algorithm */
|
|
if( alg == 0 )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
/* A requested algorithm cannot be a wildcard. */
|
|
if( PSA_ALG_IS_WILDCARD( alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
if( psa_key_algorithm_permits( key_type, policy->alg, alg ) ||
|
|
psa_key_algorithm_permits( key_type, policy->alg2, alg ) )
|
|
return( PSA_SUCCESS );
|
|
else
|
|
return( PSA_ERROR_NOT_PERMITTED );
|
|
}
|
|
|
|
/** Restrict a key policy based on a constraint.
|
|
*
|
|
* \note This function requires providing the key type for which the policy is
|
|
* being restricted, since some algorithm policy definitions (e.g. MAC)
|
|
* have different properties depending on what kind of cipher it is
|
|
* combined with.
|
|
*
|
|
* \param[in] key_type The key type for which to restrict the policy
|
|
* \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 key_type, \c *policy and \c *constraint are incompatible.
|
|
* \c *policy is unchanged.
|
|
*/
|
|
static psa_status_t psa_restrict_key_policy(
|
|
psa_key_type_t key_type,
|
|
psa_key_policy_t *policy,
|
|
const psa_key_policy_t *constraint )
|
|
{
|
|
psa_algorithm_t intersection_alg =
|
|
psa_key_policy_algorithm_intersection( key_type, policy->alg,
|
|
constraint->alg );
|
|
psa_algorithm_t intersection_alg2 =
|
|
psa_key_policy_algorithm_intersection( key_type, 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 );
|
|
}
|
|
|
|
/** Get the description of a key given its identifier and policy constraints
|
|
* and lock it.
|
|
*
|
|
* 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. If \p alg is
|
|
* zero, the algorithm is not checked.
|
|
*
|
|
* In case of a persistent key, the function loads the description of the key
|
|
* into a key slot if not already done.
|
|
*
|
|
* On success, the returned key slot is locked. It is the responsibility of
|
|
* the caller to unlock the key slot when it does not access it anymore.
|
|
*/
|
|
static psa_status_t psa_get_and_lock_key_slot_with_policy(
|
|
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_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
status = psa_get_and_lock_key_slot( key, p_slot );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
slot = *p_slot;
|
|
|
|
/* 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 )
|
|
{
|
|
status = PSA_ERROR_NOT_PERMITTED;
|
|
goto error;
|
|
}
|
|
|
|
/* Enforce that the usage policy permits the requested algortihm. */
|
|
if( alg != 0 )
|
|
{
|
|
status = psa_key_policy_permits( &slot->attr.policy,
|
|
slot->attr.type,
|
|
alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto error;
|
|
}
|
|
|
|
return( PSA_SUCCESS );
|
|
|
|
error:
|
|
*p_slot = NULL;
|
|
psa_unlock_key_slot( slot );
|
|
|
|
return( status );
|
|
}
|
|
|
|
/** Get a key slot containing a transparent key and lock it.
|
|
*
|
|
* 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_and_lock_key_slot_with_policy() until secure element support is
|
|
* fully implemented.
|
|
*
|
|
* On success, the returned key slot is locked. It is the responsibility of the
|
|
* caller to unlock the key slot when it does not access it anymore.
|
|
*/
|
|
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
|
|
static psa_status_t psa_get_and_lock_transparent_key_slot_with_policy(
|
|
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_and_lock_key_slot_with_policy( key, p_slot,
|
|
usage, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
if( psa_key_slot_is_external( *p_slot ) )
|
|
{
|
|
psa_unlock_key_slot( *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_and_lock_transparent_key_slot_with_policy( key, p_slot, usage, alg ) \
|
|
psa_get_and_lock_key_slot_with_policy( key, p_slot, usage, alg )
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
psa_status_t psa_remove_key_data_from_memory( psa_key_slot_t *slot )
|
|
{
|
|
/* Data pointer will always be either a valid pointer or NULL in an
|
|
* initialized slot, so we can just free it. */
|
|
if( slot->key.data != NULL )
|
|
mbedtls_platform_zeroize( slot->key.data, slot->key.bytes);
|
|
|
|
mbedtls_free( slot->key.data );
|
|
slot->key.data = NULL;
|
|
slot->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 );
|
|
|
|
/*
|
|
* As the return error code may not be handled in case of multiple errors,
|
|
* do our best to report an unexpected lock counter: if available
|
|
* call MBEDTLS_PARAM_FAILED that may terminate execution (if called as
|
|
* part of the execution of a test suite this will stop the test suite
|
|
* execution).
|
|
*/
|
|
if( slot->lock_count != 1 )
|
|
{
|
|
#ifdef MBEDTLS_CHECK_PARAMS
|
|
MBEDTLS_PARAM_FAILED( slot->lock_count == 1 );
|
|
#endif
|
|
status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
}
|
|
|
|
/* 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 );
|
|
|
|
/*
|
|
* Get the description of the key in a key slot. In case of a persistent
|
|
* key, this will load the key description from persistent memory if not
|
|
* done yet. We cannot avoid this loading as without it we don't know if
|
|
* the key is operated by an SE or not and this information is needed by
|
|
* the current implementation.
|
|
*/
|
|
status = psa_get_and_lock_key_slot( key, &slot );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
/*
|
|
* If the key slot containing the key description is under access by the
|
|
* library (apart from the present access), the key cannot be destroyed
|
|
* yet. For the time being, just return in error. Eventually (to be
|
|
* implemented), the key should be destroyed when all accesses have
|
|
* stopped.
|
|
*/
|
|
if( slot->lock_count > 1 )
|
|
{
|
|
psa_unlock_key_slot( slot );
|
|
return( PSA_ERROR_GENERIC_ERROR );
|
|
}
|
|
|
|
#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 = psa_key_slot_get_slot_number( slot );
|
|
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,
|
|
psa_key_slot_get_slot_number( slot ) );
|
|
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 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
|
|
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 /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
|
|
|
|
/** 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_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
psa_reset_key_attributes( attributes );
|
|
|
|
status = psa_get_and_lock_key_slot_with_policy( 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,
|
|
psa_key_slot_get_slot_number( slot ) );
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
switch( slot->attr.type )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
|
|
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 = mbedtls_psa_rsa_load_representation(
|
|
slot->attr.type,
|
|
slot->key.data,
|
|
slot->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 /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
|
|
default:
|
|
/* Nothing else to do. */
|
|
break;
|
|
}
|
|
|
|
if( status != PSA_SUCCESS )
|
|
psa_reset_key_attributes( attributes );
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : 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_export_key_buffer_internal( const uint8_t *key_buffer,
|
|
size_t key_buffer_size,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length )
|
|
{
|
|
if( key_buffer_size > data_size )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
memcpy( data, key_buffer, key_buffer_size );
|
|
memset( data + key_buffer_size, 0,
|
|
data_size - key_buffer_size );
|
|
*data_length = key_buffer_size;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_export_key_internal(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer, size_t key_buffer_size,
|
|
uint8_t *data, size_t data_size, size_t *data_length )
|
|
{
|
|
psa_key_type_t type = attributes->core.type;
|
|
|
|
if( key_type_is_raw_bytes( type ) ||
|
|
PSA_KEY_TYPE_IS_RSA( type ) ||
|
|
PSA_KEY_TYPE_IS_ECC( type ) )
|
|
{
|
|
return( psa_export_key_buffer_internal(
|
|
key_buffer, key_buffer_size,
|
|
data, data_size, data_length ) );
|
|
}
|
|
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_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
/* 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 );
|
|
|
|
/* 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_and_lock_key_slot_with_policy() takes care of this.
|
|
*/
|
|
status = psa_get_and_lock_key_slot_with_policy( key, &slot,
|
|
PSA_KEY_USAGE_EXPORT, 0 );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
status = psa_driver_wrapper_export_key( &attributes,
|
|
slot->key.data, slot->key.bytes,
|
|
data, data_size, data_length );
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
|
|
}
|
|
|
|
psa_status_t psa_export_public_key_internal(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer,
|
|
size_t key_buffer_size,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length )
|
|
{
|
|
psa_key_type_t type = attributes->core.type;
|
|
|
|
if( PSA_KEY_TYPE_IS_RSA( type ) || PSA_KEY_TYPE_IS_ECC( type ) )
|
|
{
|
|
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) )
|
|
{
|
|
/* Exporting public -> public */
|
|
return( psa_export_key_buffer_internal(
|
|
key_buffer, key_buffer_size,
|
|
data, data_size, data_length ) );
|
|
}
|
|
|
|
if( PSA_KEY_TYPE_IS_RSA( type ) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
|
|
return( mbedtls_psa_rsa_export_public_key( attributes,
|
|
key_buffer,
|
|
key_buffer_size,
|
|
data,
|
|
data_size,
|
|
data_length ) );
|
|
#else
|
|
/* We don't know how to convert a private RSA key to public. */
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
|
|
}
|
|
else
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY)
|
|
return( mbedtls_psa_ecp_export_public_key( attributes,
|
|
key_buffer,
|
|
key_buffer_size,
|
|
data,
|
|
data_size,
|
|
data_length ) );
|
|
#else
|
|
/* We don't know how to convert a private ECC key to public */
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) */
|
|
}
|
|
}
|
|
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_public_key( mbedtls_svc_key_id_t key,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
/* 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 );
|
|
|
|
/* 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_and_lock_key_slot_with_policy( key, &slot, 0, 0 );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
if( ! PSA_KEY_TYPE_IS_ASYMMETRIC( slot->attr.type ) )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
status = psa_driver_wrapper_export_public_key(
|
|
&attributes, slot->key.data, slot->key.bytes,
|
|
data, data_size, data_length );
|
|
|
|
exit:
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
|
|
}
|
|
|
|
#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_MESSAGE |
|
|
PSA_KEY_USAGE_VERIFY_MESSAGE |
|
|
PSA_KEY_USAGE_SIGN_HASH |
|
|
PSA_KEY_USAGE_VERIFY_HASH |
|
|
PSA_KEY_USAGE_VERIFY_DERIVATION |
|
|
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
|
|
{
|
|
if( !psa_is_valid_key_id( psa_get_key_id( attributes ), 0 ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
|
|
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().
|
|
*
|
|
* On success, the key slot is locked. It is the responsibility of the caller
|
|
* to unlock the key slot when it does not access it anymore.
|
|
*
|
|
* \param method An identification of the calling function.
|
|
* \param[in] attributes Key attributes for the new key.
|
|
* \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,
|
|
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 )
|
|
{
|
|
psa_key_slot_number_t slot_number;
|
|
status = psa_find_se_slot_for_key( attributes, method, *p_drv,
|
|
&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_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 );
|
|
}
|
|
}
|
|
|
|
status = psa_copy_key_material_into_slot(
|
|
slot, (uint8_t *)( &slot_number ), sizeof( slot_number ) );
|
|
}
|
|
|
|
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 */
|
|
|
|
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.
|
|
*
|
|
* If the finalization succeeds, the function unlocks the key slot (it was
|
|
* locked by psa_start_key_creation()) and the key slot cannot be accessed
|
|
* anymore as part of the key creation process.
|
|
*
|
|
* \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.
|
|
* \param[out] key On success, identifier of the key. Note that the
|
|
* key identifier is also stored in the key slot.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* The key was successfully created.
|
|
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
|
|
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
|
|
* \retval #PSA_ERROR_ALREADY_EXISTS
|
|
* \retval #PSA_ERROR_DATA_INVALID
|
|
* \retval #PSA_ERROR_DATA_CORRUPT
|
|
* \retval #PSA_ERROR_STORAGE_FAILURE
|
|
*
|
|
* \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,
|
|
mbedtls_svc_key_id_t *key)
|
|
{
|
|
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;
|
|
psa_key_slot_number_t slot_number =
|
|
psa_key_slot_get_slot_number( slot ) ;
|
|
|
|
#if defined(static_assert)
|
|
static_assert( sizeof( slot_number ) ==
|
|
sizeof( data.slot_number ),
|
|
"Slot number size does not match psa_se_key_data_storage_t" );
|
|
#endif
|
|
memcpy( &data.slot_number, &slot_number, sizeof( 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->key.data,
|
|
slot->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( );
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
|
|
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
*key = slot->attr.id;
|
|
status = psa_unlock_key_slot( slot );
|
|
if( status != PSA_SUCCESS )
|
|
*key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
}
|
|
|
|
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_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
|
|
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 = mbedtls_psa_rsa_load_representation(
|
|
slot->attr.type,
|
|
slot->key.data,
|
|
slot->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 /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
|
|
{
|
|
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;
|
|
size_t bits;
|
|
|
|
*key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
|
|
/* 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,
|
|
&slot, &driver );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* In the case of a transparent key or an opaque key stored in local
|
|
* storage (thus not in the case of generating a key in a secure element
|
|
* or cryptoprocessor with storage), we have to allocate a buffer to
|
|
* hold the generated key material. */
|
|
if( slot->key.data == NULL )
|
|
{
|
|
status = psa_allocate_buffer_to_slot( slot, data_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
}
|
|
|
|
bits = slot->attr.bits;
|
|
status = psa_driver_wrapper_import_key( attributes,
|
|
data, data_length,
|
|
slot->key.data,
|
|
slot->key.bytes,
|
|
&slot->key.bytes, &bits );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
if( slot->attr.bits == 0 )
|
|
slot->attr.bits = (psa_key_bits_t) bits;
|
|
else if( bits != slot->attr.bits )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_validate_optional_attributes( slot, attributes );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_finish_key_creation( slot, driver, key );
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
psa_fail_key_creation( slot, driver );
|
|
|
|
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,
|
|
&slot, &driver );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_finish_key_creation( slot, driver, &key );
|
|
|
|
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->key.data,
|
|
source->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_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
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;
|
|
|
|
*target_key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
|
|
status = psa_get_and_lock_transparent_key_slot_with_policy(
|
|
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( source_slot->attr.type,
|
|
&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_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 */
|
|
|
|
if( psa_key_lifetime_is_external( actual_attributes.core.lifetime ) )
|
|
{
|
|
/*
|
|
* Copying through an opaque driver is not implemented yet, consider
|
|
* a lifetime with an external location as an invalid parameter for
|
|
* now.
|
|
*/
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_copy_key_material( source_slot, target_slot );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_finish_key_creation( target_slot, driver, target_key );
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
psa_fail_key_creation( target_slot, driver );
|
|
|
|
unlock_status = psa_unlock_key_slot( source_slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Message digests */
|
|
/****************************************************************/
|
|
|
|
psa_status_t psa_hash_abort( psa_hash_operation_t *operation )
|
|
{
|
|
/* Aborting a non-active operation is allowed */
|
|
if( operation->id == 0 )
|
|
return( PSA_SUCCESS );
|
|
|
|
psa_status_t status = psa_driver_wrapper_hash_abort( operation );
|
|
operation->id = 0;
|
|
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_hash_setup( psa_hash_operation_t *operation,
|
|
psa_algorithm_t alg )
|
|
{
|
|
/* A context must be freshly initialized before it can be set up. */
|
|
if( operation->id != 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( !PSA_ALG_IS_HASH( alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
/* Ensure all of the context is zeroized, since PSA_HASH_OPERATION_INIT only
|
|
* directly zeroes the int-sized dummy member of the context union. */
|
|
memset( &operation->ctx, 0, sizeof( operation->ctx ) );
|
|
|
|
return( psa_driver_wrapper_hash_setup( operation, alg ) );
|
|
}
|
|
|
|
psa_status_t psa_hash_update( psa_hash_operation_t *operation,
|
|
const uint8_t *input,
|
|
size_t input_length )
|
|
{
|
|
if( operation->id == 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
/* 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 );
|
|
|
|
psa_status_t status = psa_driver_wrapper_hash_update( operation,
|
|
input, input_length );
|
|
if( status != PSA_SUCCESS )
|
|
psa_hash_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
psa_status_t psa_hash_finish( psa_hash_operation_t *operation,
|
|
uint8_t *hash,
|
|
size_t hash_size,
|
|
size_t *hash_length )
|
|
{
|
|
*hash_length = 0;
|
|
if( operation->id == 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
psa_status_t status = psa_driver_wrapper_hash_finish(
|
|
operation, hash, hash_size, hash_length );
|
|
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( mbedtls_psa_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 )
|
|
{
|
|
*hash_length = 0;
|
|
if( !PSA_ALG_IS_HASH( alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
return( psa_driver_wrapper_hash_compute( alg, input, input_length,
|
|
hash, hash_size, hash_length ) );
|
|
}
|
|
|
|
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 )
|
|
{
|
|
uint8_t actual_hash[MBEDTLS_MD_MAX_SIZE];
|
|
size_t actual_hash_length;
|
|
|
|
if( !PSA_ALG_IS_HASH( alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
psa_status_t status = psa_driver_wrapper_hash_compute(
|
|
alg, input, input_length,
|
|
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( mbedtls_psa_safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 )
|
|
return( PSA_ERROR_INVALID_SIGNATURE );
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_hash_clone( const psa_hash_operation_t *source_operation,
|
|
psa_hash_operation_t *target_operation )
|
|
{
|
|
if( source_operation->id == 0 ||
|
|
target_operation->id != 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
psa_status_t status = psa_driver_wrapper_hash_clone( source_operation,
|
|
target_operation );
|
|
if( status != PSA_SUCCESS )
|
|
psa_hash_abort( target_operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
|
|
/****************************************************************/
|
|
/* MAC */
|
|
/****************************************************************/
|
|
|
|
psa_status_t psa_mac_abort( psa_mac_operation_t *operation )
|
|
{
|
|
/* Aborting a non-active operation is allowed */
|
|
if( operation->id == 0 )
|
|
return( PSA_SUCCESS );
|
|
|
|
psa_status_t status = psa_driver_wrapper_mac_abort( operation );
|
|
operation->mac_size = 0;
|
|
operation->is_sign = 0;
|
|
operation->id = 0;
|
|
|
|
return( status );
|
|
}
|
|
|
|
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_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
/* A context must be freshly initialized before it can be set up. */
|
|
if( operation->id != 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( ! PSA_ALG_IS_MAC( alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
status = psa_get_and_lock_key_slot_with_policy(
|
|
key,
|
|
&slot,
|
|
is_sign ? PSA_KEY_USAGE_SIGN_HASH : PSA_KEY_USAGE_VERIFY_HASH,
|
|
alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
|
|
/* Validate the combination of key type and algorithm */
|
|
status = psa_mac_key_can_do( alg, psa_get_key_type( &attributes ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
operation->is_sign = is_sign;
|
|
|
|
/* Get the output length for the algorithm and key combination */
|
|
operation->mac_size = PSA_MAC_LENGTH(
|
|
psa_get_key_type( &attributes ),
|
|
psa_get_key_bits( &attributes ),
|
|
alg );
|
|
|
|
if( operation->mac_size < 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;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->mac_size > PSA_MAC_LENGTH( psa_get_key_type( &attributes ),
|
|
psa_get_key_bits( &attributes ),
|
|
PSA_ALG_FULL_LENGTH_MAC( alg ) ) )
|
|
{
|
|
/* It's impossible to "truncate" to a larger length than the full length
|
|
* of the algorithm. */
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
/* Dispatch the MAC setup call with validated input */
|
|
if( is_sign )
|
|
{
|
|
status = psa_driver_wrapper_mac_sign_setup( operation,
|
|
&attributes,
|
|
slot->key.data,
|
|
slot->key.bytes,
|
|
alg );
|
|
}
|
|
else
|
|
{
|
|
status = psa_driver_wrapper_mac_verify_setup( operation,
|
|
&attributes,
|
|
slot->key.data,
|
|
slot->key.bytes,
|
|
alg );
|
|
}
|
|
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
psa_mac_abort( operation );
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : 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 )
|
|
{
|
|
if( operation->id == 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
/* 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 );
|
|
|
|
psa_status_t status = psa_driver_wrapper_mac_update( operation,
|
|
input, input_length );
|
|
if( status != PSA_SUCCESS )
|
|
psa_mac_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
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 = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t abort_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
/* Set the output length and content to a safe default, such that in
|
|
* case the caller misses an error check, the output would be an
|
|
* unachievable MAC. */
|
|
*mac_length = mac_size;
|
|
|
|
if( operation->id == 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( ! operation->is_sign )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
/* Sanity check. This will guarantee that mac_size != 0 (and so mac != NULL)
|
|
* once all the error checks are done. */
|
|
if( operation->mac_size == 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( mac_size < operation->mac_size )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
|
|
status = psa_driver_wrapper_mac_sign_finish( operation,
|
|
mac, operation->mac_size,
|
|
mac_length );
|
|
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
/* Set the excess room in the output buffer to an invalid value, to
|
|
* avoid potentially leaking a longer MAC. */
|
|
if( mac_size > operation->mac_size )
|
|
memset( &mac[operation->mac_size],
|
|
'!',
|
|
mac_size - operation->mac_size );
|
|
}
|
|
else
|
|
{
|
|
/* Set the output length and content to a safe default, such that in
|
|
* case the caller misses an error check, the output would be an
|
|
* unachievable MAC. */
|
|
*mac_length = mac_size;
|
|
memset( mac, '!', mac_size );
|
|
}
|
|
|
|
abort_status = psa_mac_abort( operation );
|
|
|
|
return( status == PSA_SUCCESS ? abort_status : status );
|
|
}
|
|
|
|
psa_status_t psa_mac_verify_finish( psa_mac_operation_t *operation,
|
|
const uint8_t *mac,
|
|
size_t mac_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t abort_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( operation->id == 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_driver_wrapper_mac_verify_finish( operation,
|
|
mac, mac_length );
|
|
|
|
cleanup:
|
|
abort_status = psa_mac_abort( operation );
|
|
|
|
return( status == PSA_SUCCESS ? abort_status : status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Asymmetric cryptography */
|
|
/****************************************************************/
|
|
|
|
static psa_status_t psa_sign_verify_check_alg( int input_is_message,
|
|
psa_algorithm_t alg )
|
|
{
|
|
if( input_is_message )
|
|
{
|
|
if( ! PSA_ALG_IS_SIGN_MESSAGE( alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
if ( PSA_ALG_IS_HASH_AND_SIGN( alg ) )
|
|
{
|
|
if( ! PSA_ALG_IS_HASH( PSA_ALG_SIGN_GET_HASH( alg ) ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if( ! PSA_ALG_IS_HASH_AND_SIGN( alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
static psa_status_t psa_sign_internal( mbedtls_svc_key_id_t key,
|
|
int input_is_message,
|
|
psa_algorithm_t alg,
|
|
const uint8_t * input,
|
|
size_t input_length,
|
|
uint8_t * signature,
|
|
size_t signature_size,
|
|
size_t * signature_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
*signature_length = 0;
|
|
|
|
status = psa_sign_verify_check_alg( input_is_message, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return status;
|
|
|
|
/* Immediately reject a zero-length signature buffer. This guarantees
|
|
* that signature must be a valid pointer. (On the other hand, the input
|
|
* 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_and_lock_key_slot_with_policy(
|
|
key, &slot,
|
|
input_is_message ? PSA_KEY_USAGE_SIGN_MESSAGE :
|
|
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;
|
|
}
|
|
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
|
|
if( input_is_message )
|
|
{
|
|
status = psa_driver_wrapper_sign_message(
|
|
&attributes, slot->key.data, slot->key.bytes,
|
|
alg, input, input_length,
|
|
signature, signature_size, signature_length );
|
|
}
|
|
else
|
|
{
|
|
|
|
status = psa_driver_wrapper_sign_hash(
|
|
&attributes, slot->key.data, slot->key.bytes,
|
|
alg, input, input_length,
|
|
signature, signature_size, signature_length );
|
|
}
|
|
|
|
|
|
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 signature
|
|
* (barring an attack on the signature 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. */
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
|
|
}
|
|
|
|
static psa_status_t psa_verify_internal( mbedtls_svc_key_id_t key,
|
|
int input_is_message,
|
|
psa_algorithm_t alg,
|
|
const uint8_t * input,
|
|
size_t input_length,
|
|
const uint8_t * signature,
|
|
size_t signature_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
status = psa_sign_verify_check_alg( input_is_message, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return status;
|
|
|
|
status = psa_get_and_lock_key_slot_with_policy(
|
|
key, &slot,
|
|
input_is_message ? PSA_KEY_USAGE_VERIFY_MESSAGE :
|
|
PSA_KEY_USAGE_VERIFY_HASH,
|
|
alg );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
|
|
if( input_is_message )
|
|
{
|
|
status = psa_driver_wrapper_verify_message(
|
|
&attributes, slot->key.data, slot->key.bytes,
|
|
alg, input, input_length,
|
|
signature, signature_length );
|
|
}
|
|
else
|
|
{
|
|
status = psa_driver_wrapper_verify_hash(
|
|
&attributes, slot->key.data, slot->key.bytes,
|
|
alg, input, input_length,
|
|
signature, signature_length );
|
|
}
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
|
|
|
|
}
|
|
|
|
psa_status_t psa_sign_message_builtin(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer,
|
|
size_t key_buffer_size,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *input,
|
|
size_t input_length,
|
|
uint8_t *signature,
|
|
size_t signature_size,
|
|
size_t *signature_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if ( PSA_ALG_IS_HASH_AND_SIGN( alg ) )
|
|
{
|
|
size_t hash_length;
|
|
uint8_t hash[PSA_HASH_MAX_SIZE];
|
|
|
|
status = psa_driver_wrapper_hash_compute(
|
|
PSA_ALG_SIGN_GET_HASH( alg ),
|
|
input, input_length,
|
|
hash, sizeof( hash ), &hash_length );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
return status;
|
|
|
|
return psa_driver_wrapper_sign_hash(
|
|
attributes, key_buffer, key_buffer_size,
|
|
alg, hash, hash_length,
|
|
signature, signature_size, signature_length );
|
|
}
|
|
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
psa_status_t psa_sign_message( mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
const uint8_t * input,
|
|
size_t input_length,
|
|
uint8_t * signature,
|
|
size_t signature_size,
|
|
size_t * signature_length )
|
|
{
|
|
return psa_sign_internal(
|
|
key, 1, alg, input, input_length,
|
|
signature, signature_size, signature_length );
|
|
}
|
|
|
|
psa_status_t psa_verify_message_builtin(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer,
|
|
size_t key_buffer_size,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *input,
|
|
size_t input_length,
|
|
const uint8_t *signature,
|
|
size_t signature_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if ( PSA_ALG_IS_HASH_AND_SIGN( alg ) )
|
|
{
|
|
size_t hash_length;
|
|
uint8_t hash[PSA_HASH_MAX_SIZE];
|
|
|
|
status = psa_driver_wrapper_hash_compute(
|
|
PSA_ALG_SIGN_GET_HASH( alg ),
|
|
input, input_length,
|
|
hash, sizeof( hash ), &hash_length );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
return status;
|
|
|
|
return psa_driver_wrapper_verify_hash(
|
|
attributes, key_buffer, key_buffer_size,
|
|
alg, hash, hash_length,
|
|
signature, signature_length );
|
|
}
|
|
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
psa_status_t psa_verify_message( mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg,
|
|
const uint8_t * input,
|
|
size_t input_length,
|
|
const uint8_t * signature,
|
|
size_t signature_length )
|
|
{
|
|
return psa_verify_internal(
|
|
key, 1, alg, input, input_length,
|
|
signature, signature_length );
|
|
}
|
|
|
|
psa_status_t psa_sign_hash_builtin(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer, size_t key_buffer_size,
|
|
psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
|
|
uint8_t *signature, size_t signature_size, size_t *signature_length )
|
|
{
|
|
if( attributes->core.type == PSA_KEY_TYPE_RSA_KEY_PAIR )
|
|
{
|
|
if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) ||
|
|
PSA_ALG_IS_RSA_PSS( alg) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS)
|
|
return( mbedtls_psa_rsa_sign_hash(
|
|
attributes,
|
|
key_buffer, key_buffer_size,
|
|
alg, hash, hash_length,
|
|
signature, signature_size, signature_length ) );
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) */
|
|
}
|
|
else
|
|
{
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
}
|
|
else
|
|
if( PSA_KEY_TYPE_IS_ECC( attributes->core.type ) )
|
|
{
|
|
if( PSA_ALG_IS_ECDSA( alg ) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
|
|
return( mbedtls_psa_ecdsa_sign_hash(
|
|
attributes,
|
|
key_buffer, key_buffer_size,
|
|
alg, hash, hash_length,
|
|
signature, signature_size, signature_length ) );
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
|
|
}
|
|
else
|
|
{
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
}
|
|
|
|
(void)key_buffer;
|
|
(void)key_buffer_size;
|
|
(void)hash;
|
|
(void)hash_length;
|
|
(void)signature;
|
|
(void)signature_size;
|
|
(void)signature_length;
|
|
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
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 )
|
|
{
|
|
return psa_sign_internal(
|
|
key, 0, alg, hash, hash_length,
|
|
signature, signature_size, signature_length );
|
|
}
|
|
|
|
psa_status_t psa_verify_hash_builtin(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer, size_t key_buffer_size,
|
|
psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
|
|
const uint8_t *signature, size_t signature_length )
|
|
{
|
|
if( PSA_KEY_TYPE_IS_RSA( attributes->core.type ) )
|
|
{
|
|
if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) ||
|
|
PSA_ALG_IS_RSA_PSS( alg) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS)
|
|
return( mbedtls_psa_rsa_verify_hash(
|
|
attributes,
|
|
key_buffer, key_buffer_size,
|
|
alg, hash, hash_length,
|
|
signature, signature_length ) );
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) */
|
|
}
|
|
else
|
|
{
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
}
|
|
else
|
|
if( PSA_KEY_TYPE_IS_ECC( attributes->core.type ) )
|
|
{
|
|
if( PSA_ALG_IS_ECDSA( alg ) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
|
|
return( mbedtls_psa_ecdsa_verify_hash(
|
|
attributes,
|
|
key_buffer, key_buffer_size,
|
|
alg, hash, hash_length,
|
|
signature, signature_length ) );
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
|
|
}
|
|
else
|
|
{
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
}
|
|
}
|
|
|
|
(void)key_buffer;
|
|
(void)key_buffer_size;
|
|
(void)hash;
|
|
(void)hash_length;
|
|
(void)signature;
|
|
(void)signature_length;
|
|
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
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 )
|
|
{
|
|
return psa_verify_internal(
|
|
key, 0, alg, hash, hash_length,
|
|
signature, signature_length );
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
|
|
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_PSA_BUILTIN_ALG_RSA_OAEP) */
|
|
|
|
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_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
(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_and_lock_transparent_key_slot_with_policy(
|
|
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 ) ) )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
|
|
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
|
|
{
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
status = mbedtls_psa_rsa_load_representation( slot->attr.type,
|
|
slot->key.data,
|
|
slot->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_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT)
|
|
if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_rsa_pkcs1_encrypt( rsa,
|
|
mbedtls_psa_get_random,
|
|
MBEDTLS_PSA_RANDOM_STATE,
|
|
input_length,
|
|
input,
|
|
output ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
|
|
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_psa_get_random,
|
|
MBEDTLS_PSA_RANDOM_STATE,
|
|
salt, salt_length,
|
|
input_length,
|
|
input,
|
|
output ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP */
|
|
{
|
|
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 );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
}
|
|
|
|
exit:
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
|
|
}
|
|
|
|
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_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
(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_and_lock_transparent_key_slot_with_policy(
|
|
key, &slot, PSA_KEY_USAGE_DECRYPT, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
if( ! PSA_KEY_TYPE_IS_KEY_PAIR( slot->attr.type ) )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
|
|
if( slot->attr.type == PSA_KEY_TYPE_RSA_KEY_PAIR )
|
|
{
|
|
mbedtls_rsa_context *rsa = NULL;
|
|
status = mbedtls_psa_rsa_load_representation( slot->attr.type,
|
|
slot->key.data,
|
|
slot->key.bytes,
|
|
&rsa );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
if( input_length != mbedtls_rsa_get_len( rsa ) )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto rsa_exit;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT)
|
|
if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_rsa_pkcs1_decrypt( rsa,
|
|
mbedtls_psa_get_random,
|
|
MBEDTLS_PSA_RANDOM_STATE,
|
|
output_length,
|
|
input,
|
|
output,
|
|
output_size ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
|
|
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_psa_get_random,
|
|
MBEDTLS_PSA_RANDOM_STATE,
|
|
salt, salt_length,
|
|
output_length,
|
|
input,
|
|
output,
|
|
output_size ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP */
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
}
|
|
|
|
rsa_exit:
|
|
mbedtls_rsa_free( rsa );
|
|
mbedtls_free( rsa );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
}
|
|
|
|
exit:
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* 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 )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
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->id != 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_and_lock_key_slot_with_policy( key, &slot, usage, alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* Initialize the operation struct members, except for id. The id member
|
|
* is used to indicate to psa_cipher_abort that there are resources to free,
|
|
* so we only set it (in the driver wrapper) after resources have been
|
|
* allocated/initialized. */
|
|
operation->iv_set = 0;
|
|
if( alg == PSA_ALG_ECB_NO_PADDING )
|
|
operation->iv_required = 0;
|
|
else
|
|
operation->iv_required = 1;
|
|
operation->default_iv_length = PSA_CIPHER_IV_LENGTH( slot->attr.type, alg );
|
|
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
|
|
/* Try doing the operation through a driver before using software fallback. */
|
|
if( cipher_operation == MBEDTLS_ENCRYPT )
|
|
status = psa_driver_wrapper_cipher_encrypt_setup( operation,
|
|
&attributes,
|
|
slot->key.data,
|
|
slot->key.bytes,
|
|
alg );
|
|
else
|
|
status = psa_driver_wrapper_cipher_decrypt_setup( operation,
|
|
&attributes,
|
|
slot->key.data,
|
|
slot->key.bytes,
|
|
alg );
|
|
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
psa_cipher_abort( operation );
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : 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 = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
*iv_length = 0;
|
|
|
|
if( operation->id == 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( operation->iv_set || ! operation->iv_required )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
if( iv_size < operation->default_iv_length )
|
|
{
|
|
status = PSA_ERROR_BUFFER_TOO_SMALL;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_generate_random( iv, operation->default_iv_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_driver_wrapper_cipher_set_iv( operation,
|
|
iv,
|
|
operation->default_iv_length );
|
|
|
|
exit:
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
operation->iv_set = 1;
|
|
*iv_length = operation->default_iv_length;
|
|
}
|
|
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 = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( operation->id == 0 )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( operation->iv_set || ! operation->iv_required )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( iv_length > PSA_CIPHER_IV_MAX_SIZE )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
status = psa_driver_wrapper_cipher_set_iv( operation,
|
|
iv,
|
|
iv_length );
|
|
|
|
if( status == PSA_SUCCESS )
|
|
operation->iv_set = 1;
|
|
else
|
|
psa_cipher_abort( operation );
|
|
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;
|
|
|
|
if( operation->id == 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
if( operation->iv_required && ! operation->iv_set )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
status = psa_driver_wrapper_cipher_update( operation,
|
|
input,
|
|
input_length,
|
|
output,
|
|
output_size,
|
|
output_length );
|
|
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;
|
|
|
|
if( operation->id == 0 )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
if( operation->iv_required && ! operation->iv_set )
|
|
{
|
|
return( PSA_ERROR_BAD_STATE );
|
|
}
|
|
|
|
status = psa_driver_wrapper_cipher_finish( operation,
|
|
output,
|
|
output_size,
|
|
output_length );
|
|
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->id == 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 );
|
|
}
|
|
|
|
psa_driver_wrapper_cipher_abort( operation );
|
|
|
|
operation->id = 0;
|
|
operation->iv_set = 0;
|
|
operation->iv_required = 0;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/****************************************************************/
|
|
/* AEAD */
|
|
/****************************************************************/
|
|
|
|
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 = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
*ciphertext_length = 0;
|
|
|
|
if( !PSA_ALG_IS_AEAD( alg ) || PSA_ALG_IS_WILDCARD( alg ) )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
status = psa_get_and_lock_key_slot_with_policy(
|
|
key, &slot, PSA_KEY_USAGE_ENCRYPT, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
|
|
status = psa_driver_wrapper_aead_encrypt(
|
|
&attributes, slot->key.data, slot->key.bytes,
|
|
alg,
|
|
nonce, nonce_length,
|
|
additional_data, additional_data_length,
|
|
plaintext, plaintext_length,
|
|
ciphertext, ciphertext_size, ciphertext_length );
|
|
|
|
if( status != PSA_SUCCESS && ciphertext_size != 0 )
|
|
memset( ciphertext, 0, ciphertext_size );
|
|
|
|
psa_unlock_key_slot( slot );
|
|
|
|
return( status );
|
|
}
|
|
|
|
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 = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
*plaintext_length = 0;
|
|
|
|
if( !PSA_ALG_IS_AEAD( alg ) || PSA_ALG_IS_WILDCARD( alg ) )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
status = psa_get_and_lock_key_slot_with_policy(
|
|
key, &slot, PSA_KEY_USAGE_DECRYPT, alg );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
|
|
status = psa_driver_wrapper_aead_decrypt(
|
|
&attributes, slot->key.data, slot->key.bytes,
|
|
alg,
|
|
nonce, nonce_length,
|
|
additional_data, additional_data_length,
|
|
ciphertext, ciphertext_length,
|
|
plaintext, plaintext_size, plaintext_length );
|
|
|
|
if( status != PSA_SUCCESS && plaintext_size != 0 )
|
|
memset( plaintext, 0, plaintext_size );
|
|
|
|
psa_unlock_key_slot( slot );
|
|
|
|
return( status );
|
|
}
|
|
|
|
/* Helper function to get the base algorithm from its variants. */
|
|
static psa_algorithm_t psa_aead_get_base_algorithm( psa_algorithm_t alg )
|
|
{
|
|
return PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG( alg );
|
|
}
|
|
|
|
/* Set the key for a multipart authenticated operation. */
|
|
static psa_status_t psa_aead_setup( psa_aead_operation_t *operation,
|
|
int is_encrypt,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot = NULL;
|
|
psa_key_usage_t key_usage = 0;
|
|
|
|
if( !PSA_ALG_IS_AEAD( alg ) || PSA_ALG_IS_WILDCARD( alg ) )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->id != 0 )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->nonce_set || operation->lengths_set ||
|
|
operation->ad_started || operation->body_started )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
if( is_encrypt )
|
|
key_usage = PSA_KEY_USAGE_ENCRYPT;
|
|
else
|
|
key_usage = PSA_KEY_USAGE_DECRYPT;
|
|
|
|
status = psa_get_and_lock_key_slot_with_policy( key, &slot, key_usage,
|
|
alg );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
|
|
if( is_encrypt )
|
|
status = psa_driver_wrapper_aead_encrypt_setup( operation,
|
|
&attributes,
|
|
slot->key.data,
|
|
slot->key.bytes,
|
|
alg );
|
|
else
|
|
status = psa_driver_wrapper_aead_decrypt_setup( operation,
|
|
&attributes,
|
|
slot->key.data,
|
|
slot->key.bytes,
|
|
alg );
|
|
|
|
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
operation->key_type = psa_get_key_type( &attributes );
|
|
|
|
exit:
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
status = unlock_status;
|
|
operation->alg = psa_aead_get_base_algorithm( alg );
|
|
operation->is_encrypt = is_encrypt;
|
|
}
|
|
else
|
|
psa_aead_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
/* Set the key for a multipart authenticated encryption operation. */
|
|
psa_status_t psa_aead_encrypt_setup( psa_aead_operation_t *operation,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg )
|
|
{
|
|
return( psa_aead_setup( operation, 1, key, alg ) );
|
|
}
|
|
|
|
/* Set the key for a multipart authenticated decryption operation. */
|
|
psa_status_t psa_aead_decrypt_setup( psa_aead_operation_t *operation,
|
|
mbedtls_svc_key_id_t key,
|
|
psa_algorithm_t alg )
|
|
{
|
|
return( psa_aead_setup( operation, 0, key, alg ) );
|
|
}
|
|
|
|
/* Generate a random nonce / IV for multipart AEAD operation */
|
|
psa_status_t psa_aead_generate_nonce( psa_aead_operation_t *operation,
|
|
uint8_t *nonce,
|
|
size_t nonce_size,
|
|
size_t *nonce_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
size_t required_nonce_size;
|
|
|
|
*nonce_length = 0;
|
|
|
|
if( operation->id == 0 )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->nonce_set || !operation->is_encrypt )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
required_nonce_size = PSA_AEAD_NONCE_LENGTH( operation->key_type,
|
|
operation->alg );
|
|
|
|
if( nonce_size < required_nonce_size )
|
|
{
|
|
status = PSA_ERROR_BUFFER_TOO_SMALL;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_generate_random( nonce, required_nonce_size );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_aead_set_nonce( operation, nonce, required_nonce_size );
|
|
|
|
exit:
|
|
|
|
if( status == PSA_SUCCESS )
|
|
*nonce_length = required_nonce_size;
|
|
else
|
|
psa_aead_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
/* Set the nonce for a multipart authenticated encryption or decryption
|
|
operation.*/
|
|
psa_status_t psa_aead_set_nonce( psa_aead_operation_t *operation,
|
|
const uint8_t *nonce,
|
|
size_t nonce_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( operation->id == 0 )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->nonce_set )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
/* Not checking nonce size here as GCM spec allows almost arbitrarily
|
|
* large nonces. Please note that we do not generally recommend the usage
|
|
* of nonces of greater length than PSA_AEAD_NONCE_MAX_SIZE, as large
|
|
* nonces are hashed to a shorter size, which can then lead to collisions
|
|
* if you encrypt a very large number of messages.*/
|
|
|
|
status = psa_driver_wrapper_aead_set_nonce( operation, nonce,
|
|
nonce_length );
|
|
|
|
exit:
|
|
|
|
if( status == PSA_SUCCESS )
|
|
operation->nonce_set = 1;
|
|
else
|
|
psa_aead_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
/* Declare the lengths of the message and additional data for multipart AEAD. */
|
|
psa_status_t psa_aead_set_lengths( psa_aead_operation_t *operation,
|
|
size_t ad_length,
|
|
size_t plaintext_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( operation->id == 0 )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->lengths_set || operation->ad_started ||
|
|
operation->body_started )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_driver_wrapper_aead_set_lengths( operation, ad_length,
|
|
plaintext_length );
|
|
|
|
exit:
|
|
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
operation->ad_remaining = ad_length;
|
|
operation->body_remaining = plaintext_length;
|
|
operation->lengths_set = 1;
|
|
}
|
|
else
|
|
psa_aead_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
/* Pass additional data to an active multipart AEAD operation. */
|
|
psa_status_t psa_aead_update_ad( psa_aead_operation_t *operation,
|
|
const uint8_t *input,
|
|
size_t input_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( operation->id == 0 )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
if( !operation->nonce_set || operation->body_started )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->lengths_set )
|
|
{
|
|
if( operation->ad_remaining < input_length )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
operation->ad_remaining -= input_length;
|
|
}
|
|
|
|
status = psa_driver_wrapper_aead_update_ad( operation, input,
|
|
input_length );
|
|
|
|
exit:
|
|
|
|
if( status == PSA_SUCCESS )
|
|
operation->ad_started = 1;
|
|
else
|
|
psa_aead_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
/* Encrypt or decrypt a message fragment in an active multipart AEAD
|
|
operation.*/
|
|
psa_status_t psa_aead_update( psa_aead_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;
|
|
|
|
*output_length = 0;
|
|
|
|
if( operation->id == 0 )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
if( !operation->nonce_set )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation->lengths_set )
|
|
{
|
|
/* Additional data length was supplied, but not all the additional
|
|
data was supplied.*/
|
|
if( operation->ad_remaining != 0 )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
/* Too much data provided. */
|
|
if( operation->body_remaining < input_length )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
operation->body_remaining -= input_length;
|
|
}
|
|
|
|
status = psa_driver_wrapper_aead_update( operation, input, input_length,
|
|
output, output_size,
|
|
output_length );
|
|
|
|
exit:
|
|
|
|
if( status == PSA_SUCCESS )
|
|
operation->body_started = 1;
|
|
else
|
|
psa_aead_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
static psa_status_t psa_aead_final_checks( psa_aead_operation_t *operation )
|
|
{
|
|
if( operation->id == 0 || !operation->nonce_set )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( operation->lengths_set && ( operation->ad_remaining != 0 ||
|
|
operation->body_remaining != 0 ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
/* Finish encrypting a message in a multipart AEAD operation. */
|
|
psa_status_t psa_aead_finish( psa_aead_operation_t *operation,
|
|
uint8_t *ciphertext,
|
|
size_t ciphertext_size,
|
|
size_t *ciphertext_length,
|
|
uint8_t *tag,
|
|
size_t tag_size,
|
|
size_t *tag_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
*ciphertext_length = 0;
|
|
*tag_length = tag_size;
|
|
|
|
status = psa_aead_final_checks( operation );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
if( !operation->is_encrypt )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_driver_wrapper_aead_finish( operation, ciphertext,
|
|
ciphertext_size,
|
|
ciphertext_length,
|
|
tag, tag_size, tag_length );
|
|
|
|
exit:
|
|
|
|
/* In case the operation fails and the user fails to check for failure or
|
|
* the zero tag size, make sure the tag is set to something impossible.
|
|
* Even if the operation succeeds, make sure we set the rest of the
|
|
* buffer to something impossible to prevent potential leakage of
|
|
* anything previously placed in the same buffer.*/
|
|
if( status != PSA_SUCCESS )
|
|
memset( tag, '!', tag_size );
|
|
else if( *tag_length < tag_size )
|
|
memset( tag + *tag_length, '!', ( tag_size - *tag_length ) );
|
|
|
|
psa_aead_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
/* Finish authenticating and decrypting a message in a multipart AEAD
|
|
operation.*/
|
|
psa_status_t psa_aead_verify( psa_aead_operation_t *operation,
|
|
uint8_t *plaintext,
|
|
size_t plaintext_size,
|
|
size_t *plaintext_length,
|
|
const uint8_t *tag,
|
|
size_t tag_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
*plaintext_length = 0;
|
|
|
|
status = psa_aead_final_checks( operation );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
if( operation->is_encrypt )
|
|
{
|
|
status = PSA_ERROR_BAD_STATE;
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_driver_wrapper_aead_verify( operation, plaintext,
|
|
plaintext_size,
|
|
plaintext_length,
|
|
tag, tag_length );
|
|
|
|
exit:
|
|
|
|
psa_aead_abort( operation );
|
|
|
|
return( status );
|
|
}
|
|
|
|
/* Abort an AEAD operation. */
|
|
psa_status_t psa_aead_abort( psa_aead_operation_t *operation )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( operation->id == 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 );
|
|
}
|
|
|
|
status = psa_driver_wrapper_aead_abort( operation );
|
|
|
|
operation->id = 0;
|
|
operation->nonce_set = 0;
|
|
operation->lengths_set = 0;
|
|
operation->ad_started = 0;
|
|
operation->body_started = 0;
|
|
operation->is_encrypt = 0;
|
|
|
|
return( status );
|
|
}
|
|
|
|
/****************************************************************/
|
|
/* Generators */
|
|
/****************************************************************/
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_HKDF) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
|
|
#define AT_LEAST_ONE_BUILTIN_KDF
|
|
#endif /* At least one builtin KDF */
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_HKDF) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
|
|
static psa_status_t psa_key_derivation_start_hmac(
|
|
psa_mac_operation_t *operation,
|
|
psa_algorithm_t hash_alg,
|
|
const uint8_t *hmac_key,
|
|
size_t hmac_key_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
|
|
psa_set_key_bits( &attributes, PSA_BYTES_TO_BITS( hmac_key_length ) );
|
|
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH );
|
|
|
|
operation->is_sign = 1;
|
|
operation->mac_size = PSA_HASH_LENGTH( hash_alg );
|
|
|
|
status = psa_driver_wrapper_mac_sign_setup( operation,
|
|
&attributes,
|
|
hmac_key, hmac_key_length,
|
|
PSA_ALG_HMAC( hash_alg ) );
|
|
|
|
psa_reset_key_attributes( &attributes );
|
|
return( status );
|
|
}
|
|
#endif /* KDF algorithms reliant on HMAC */
|
|
|
|
#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_PSA_BUILTIN_ALG_HKDF)
|
|
if( PSA_ALG_IS_HKDF( kdf_alg ) )
|
|
{
|
|
mbedtls_free( operation->ctx.hkdf.info );
|
|
status = psa_mac_abort( &operation->ctx.hkdf.hmac );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_HKDF */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
|
|
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.secret != NULL )
|
|
{
|
|
mbedtls_platform_zeroize( operation->ctx.tls12_prf.secret,
|
|
operation->ctx.tls12_prf.secret_length );
|
|
mbedtls_free( operation->ctx.tls12_prf.secret );
|
|
}
|
|
|
|
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_SUCCESS;
|
|
|
|
/* 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 /* defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) ||
|
|
* defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS) */
|
|
{
|
|
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_PSA_BUILTIN_ALG_HKDF)
|
|
/* 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_LENGTH( hash_alg );
|
|
size_t hmac_output_length;
|
|
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_key_derivation_start_hmac( &hkdf->hmac,
|
|
hash_alg,
|
|
hkdf->prk,
|
|
hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
if( hkdf->block_number != 1 )
|
|
{
|
|
status = psa_mac_update( &hkdf->hmac,
|
|
hkdf->output_block,
|
|
hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
}
|
|
status = psa_mac_update( &hkdf->hmac,
|
|
hkdf->info,
|
|
hkdf->info_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
status = psa_mac_update( &hkdf->hmac,
|
|
&hkdf->block_number, 1 );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
status = psa_mac_sign_finish( &hkdf->hmac,
|
|
hkdf->output_block,
|
|
sizeof( hkdf->output_block ),
|
|
&hmac_output_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
}
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_HKDF */
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
|
|
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_LENGTH( hash_alg );
|
|
psa_mac_operation_t hmac = PSA_MAC_OPERATION_INIT;
|
|
size_t hmac_output_length;
|
|
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`.
|
|
*/
|
|
|
|
status = psa_key_derivation_start_hmac( &hmac,
|
|
hash_alg,
|
|
tls12_prf->secret,
|
|
tls12_prf->secret_length );
|
|
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_mac_update( &hmac,
|
|
tls12_prf->label,
|
|
tls12_prf->label_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_mac_update( &hmac,
|
|
tls12_prf->seed,
|
|
tls12_prf->seed_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
}
|
|
else
|
|
{
|
|
/* A(i) = HMAC_hash(secret, A(i-1)) */
|
|
status = psa_mac_update( &hmac, tls12_prf->Ai, hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
}
|
|
|
|
status = psa_mac_sign_finish( &hmac,
|
|
tls12_prf->Ai, hash_length,
|
|
&hmac_output_length );
|
|
if( hmac_output_length != hash_length )
|
|
status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
|
|
/* Calculate HMAC_hash(secret, A(i) + label + seed). */
|
|
status = psa_key_derivation_start_hmac( &hmac,
|
|
hash_alg,
|
|
tls12_prf->secret,
|
|
tls12_prf->secret_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_mac_update( &hmac, tls12_prf->Ai, hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_mac_update( &hmac, tls12_prf->label, tls12_prf->label_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_mac_update( &hmac, tls12_prf->seed, tls12_prf->seed_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
status = psa_mac_sign_finish( &hmac,
|
|
tls12_prf->output_block, hash_length,
|
|
&hmac_output_length );
|
|
if( status != PSA_SUCCESS )
|
|
goto cleanup;
|
|
|
|
|
|
cleanup:
|
|
cleanup_status = psa_mac_abort( &hmac );
|
|
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_LENGTH( 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_PSA_BUILTIN_ALG_TLS12_PRF ||
|
|
* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS */
|
|
|
|
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_PSA_BUILTIN_ALG_HKDF)
|
|
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
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_HKDF */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
|
|
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_PSA_BUILTIN_ALG_TLS12_PRF ||
|
|
* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS */
|
|
{
|
|
(void) kdf_alg;
|
|
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_PSA_BUILTIN_KEY_TYPE_DES)
|
|
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_PSA_BUILTIN_KEY_TYPE_DES */
|
|
|
|
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_PSA_BUILTIN_KEY_TYPE_DES)
|
|
if( slot->attr.type == PSA_KEY_TYPE_DES )
|
|
psa_des_set_key_parity( data, bytes );
|
|
#endif /* MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES */
|
|
|
|
status = psa_allocate_buffer_to_slot( slot, bytes );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
slot->attr.bits = (psa_key_bits_t) bits;
|
|
psa_key_attributes_t attributes = {
|
|
.core = slot->attr
|
|
};
|
|
|
|
status = psa_driver_wrapper_import_key( &attributes,
|
|
data, bytes,
|
|
slot->key.data,
|
|
slot->key.bytes,
|
|
&slot->key.bytes, &bits );
|
|
if( bits != slot->attr.bits )
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
|
|
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;
|
|
|
|
*key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
|
|
/* 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,
|
|
&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, key );
|
|
if( status != PSA_SUCCESS )
|
|
psa_fail_key_creation( slot, driver );
|
|
|
|
return( status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Key derivation */
|
|
/****************************************************************/
|
|
|
|
#if defined(AT_LEAST_ONE_BUILTIN_KDF)
|
|
static psa_status_t psa_key_derivation_setup_kdf(
|
|
psa_key_derivation_operation_t *operation,
|
|
psa_algorithm_t kdf_alg )
|
|
{
|
|
int is_kdf_alg_supported;
|
|
|
|
/* 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_PSA_BUILTIN_ALG_HKDF)
|
|
if( PSA_ALG_IS_HKDF( kdf_alg ) )
|
|
is_kdf_alg_supported = 1;
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF)
|
|
if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) )
|
|
is_kdf_alg_supported = 1;
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
|
|
if( PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
|
|
is_kdf_alg_supported = 1;
|
|
else
|
|
#endif
|
|
is_kdf_alg_supported = 0;
|
|
|
|
if( is_kdf_alg_supported )
|
|
{
|
|
psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( kdf_alg );
|
|
size_t hash_size = PSA_HASH_LENGTH( 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 );
|
|
}
|
|
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
#endif /* AT_LEAST_ONE_BUILTIN_KDF */
|
|
|
|
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 ) )
|
|
{
|
|
#if defined(AT_LEAST_ONE_BUILTIN_KDF)
|
|
psa_algorithm_t kdf_alg = PSA_ALG_KEY_AGREEMENT_GET_KDF( alg );
|
|
status = psa_key_derivation_setup_kdf( operation, kdf_alg );
|
|
#else
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
#endif /* AT_LEAST_ONE_BUILTIN_KDF */
|
|
}
|
|
else if( PSA_ALG_IS_KEY_DERIVATION( alg ) )
|
|
{
|
|
#if defined(AT_LEAST_ONE_BUILTIN_KDF)
|
|
status = psa_key_derivation_setup_kdf( operation, alg );
|
|
#else
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
#endif /* AT_LEAST_ONE_BUILTIN_KDF */
|
|
}
|
|
else
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
if( status == PSA_SUCCESS )
|
|
operation->alg = alg;
|
|
return( status );
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_HKDF)
|
|
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 );
|
|
else
|
|
{
|
|
status = psa_key_derivation_start_hmac( &hkdf->hmac,
|
|
hash_alg,
|
|
data, data_length );
|
|
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_key_derivation_start_hmac( &hkdf->hmac,
|
|
hash_alg,
|
|
NULL, 0 );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
hkdf->state = HKDF_STATE_STARTED;
|
|
}
|
|
if( hkdf->state != HKDF_STATE_STARTED )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
status = psa_mac_update( &hkdf->hmac,
|
|
data, data_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
status = psa_mac_sign_finish( &hkdf->hmac,
|
|
hkdf->prk,
|
|
sizeof( hkdf->prk ),
|
|
&data_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
hkdf->offset_in_block = PSA_HASH_LENGTH( 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 );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_HKDF */
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
|
|
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
|
|
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 != PSA_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 = PSA_TLS12_PRF_STATE_SEED_SET;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
static psa_status_t psa_tls12_prf_set_key( psa_tls12_prf_key_derivation_t *prf,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
if( prf->state != PSA_TLS12_PRF_STATE_SEED_SET )
|
|
return( PSA_ERROR_BAD_STATE );
|
|
|
|
if( data_length != 0 )
|
|
{
|
|
prf->secret = mbedtls_calloc( 1, data_length );
|
|
if( prf->secret == NULL )
|
|
return( PSA_ERROR_INSUFFICIENT_MEMORY );
|
|
|
|
memcpy( prf->secret, data, data_length );
|
|
prf->secret_length = data_length;
|
|
}
|
|
|
|
prf->state = PSA_TLS12_PRF_STATE_KEY_SET;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
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 != PSA_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 = PSA_TLS12_PRF_STATE_LABEL_SET;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
static psa_status_t psa_tls12_prf_input( psa_tls12_prf_key_derivation_t *prf,
|
|
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, 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 );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) ||
|
|
* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS */
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
|
|
static psa_status_t psa_tls12_prf_psk_to_ms_set_key(
|
|
psa_tls12_prf_key_derivation_t *prf,
|
|
const uint8_t *data,
|
|
size_t data_length )
|
|
{
|
|
psa_status_t status;
|
|
uint8_t pms[ 4 + 2 * PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE ];
|
|
uint8_t *cur = pms;
|
|
|
|
if( data_length > PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE )
|
|
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, pms, cur - pms );
|
|
|
|
mbedtls_platform_zeroize( pms, sizeof( pms ) );
|
|
return( status );
|
|
}
|
|
|
|
static psa_status_t psa_tls12_prf_psk_to_ms_input(
|
|
psa_tls12_prf_key_derivation_t *prf,
|
|
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,
|
|
data, data_length ) );
|
|
}
|
|
|
|
return( psa_tls12_prf_input( prf, step, data, data_length ) );
|
|
}
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS */
|
|
|
|
/** 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_PSA_BUILTIN_ALG_HKDF)
|
|
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
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_HKDF */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF)
|
|
if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) )
|
|
{
|
|
status = psa_tls12_prf_input( &operation->ctx.tls12_prf,
|
|
step, data, data_length );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
|
|
if( PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
|
|
{
|
|
status = psa_tls12_prf_psk_to_ms_input( &operation->ctx.tls12_prf,
|
|
step, data, data_length );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS */
|
|
{
|
|
/* This can't happen unless the operation object was not initialized */
|
|
(void) data;
|
|
(void) data_length;
|
|
(void) kdf_alg;
|
|
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_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
status = psa_get_and_lock_transparent_key_slot_with_policy(
|
|
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;
|
|
|
|
status = psa_key_derivation_input_internal( operation,
|
|
step, slot->attr.type,
|
|
slot->key.data,
|
|
slot->key.bytes );
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Key agreement */
|
|
/****************************************************************/
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDH)
|
|
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 = mbedtls_psa_ecp_load_representation(
|
|
PSA_KEY_TYPE_ECC_PUBLIC_KEY(curve),
|
|
bits,
|
|
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_psa_get_random,
|
|
MBEDTLS_PSA_RANDOM_STATE ) );
|
|
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_PSA_BUILTIN_ALG_ECDH */
|
|
|
|
#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_PSA_BUILTIN_ALG_ECDH)
|
|
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 = mbedtls_psa_ecp_load_representation(
|
|
private_key->attr.type,
|
|
private_key->attr.bits,
|
|
private_key->key.data,
|
|
private_key->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_PSA_BUILTIN_ALG_ECDH */
|
|
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_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot;
|
|
|
|
if( ! PSA_ALG_IS_KEY_AGREEMENT( operation->alg ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
status = psa_get_and_lock_transparent_key_slot_with_policy(
|
|
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;
|
|
}
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : 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_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_slot_t *slot = NULL;
|
|
|
|
if( ! PSA_ALG_IS_KEY_AGREEMENT( alg ) )
|
|
{
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
status = psa_get_and_lock_transparent_key_slot_with_policy(
|
|
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;
|
|
}
|
|
|
|
unlock_status = psa_unlock_key_slot( slot );
|
|
|
|
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************/
|
|
/* Random generation */
|
|
/****************************************************************/
|
|
|
|
/** Initialize the PSA random generator.
|
|
*/
|
|
static void mbedtls_psa_random_init( mbedtls_psa_random_context_t *rng )
|
|
{
|
|
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
|
|
memset( rng, 0, sizeof( *rng ) );
|
|
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
|
|
|
|
/* Set default configuration if
|
|
* mbedtls_psa_crypto_configure_entropy_sources() hasn't been called. */
|
|
if( rng->entropy_init == NULL )
|
|
rng->entropy_init = mbedtls_entropy_init;
|
|
if( rng->entropy_free == NULL )
|
|
rng->entropy_free = mbedtls_entropy_free;
|
|
|
|
rng->entropy_init( &rng->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( &rng->entropy,
|
|
mbedtls_nv_seed_poll, NULL,
|
|
MBEDTLS_ENTROPY_BLOCK_SIZE,
|
|
MBEDTLS_ENTROPY_SOURCE_STRONG );
|
|
#endif
|
|
|
|
mbedtls_psa_drbg_init( MBEDTLS_PSA_RANDOM_STATE );
|
|
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
|
|
}
|
|
|
|
/** Deinitialize the PSA random generator.
|
|
*/
|
|
static void mbedtls_psa_random_free( mbedtls_psa_random_context_t *rng )
|
|
{
|
|
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
|
|
memset( rng, 0, sizeof( *rng ) );
|
|
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
|
|
mbedtls_psa_drbg_free( MBEDTLS_PSA_RANDOM_STATE );
|
|
rng->entropy_free( &rng->entropy );
|
|
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
|
|
}
|
|
|
|
/** Seed the PSA random generator.
|
|
*/
|
|
static psa_status_t mbedtls_psa_random_seed( mbedtls_psa_random_context_t *rng )
|
|
{
|
|
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
|
|
/* Do nothing: the external RNG seeds itself. */
|
|
(void) rng;
|
|
return( PSA_SUCCESS );
|
|
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
|
|
const unsigned char drbg_seed[] = "PSA";
|
|
int ret = mbedtls_psa_drbg_seed( &rng->entropy,
|
|
drbg_seed, sizeof( drbg_seed ) - 1 );
|
|
return mbedtls_to_psa_error( ret );
|
|
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
|
|
}
|
|
|
|
psa_status_t psa_generate_random( uint8_t *output,
|
|
size_t output_size )
|
|
{
|
|
GUARD_MODULE_INITIALIZED;
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
|
|
|
|
size_t output_length = 0;
|
|
psa_status_t status = mbedtls_psa_external_get_random( &global_data.rng,
|
|
output, output_size,
|
|
&output_length );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
/* Breaking up a request into smaller chunks is currently not supported
|
|
* for the extrernal RNG interface. */
|
|
if( output_length != output_size )
|
|
return( PSA_ERROR_INSUFFICIENT_ENTROPY );
|
|
return( PSA_SUCCESS );
|
|
|
|
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
|
|
|
|
while( output_size > 0 )
|
|
{
|
|
size_t request_size =
|
|
( output_size > MBEDTLS_PSA_RANDOM_MAX_REQUEST ?
|
|
MBEDTLS_PSA_RANDOM_MAX_REQUEST :
|
|
output_size );
|
|
int ret = mbedtls_psa_get_random( MBEDTLS_PSA_RANDOM_STATE,
|
|
output, request_size );
|
|
if( ret != 0 )
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
output_size -= request_size;
|
|
output += request_size;
|
|
}
|
|
return( PSA_SUCCESS );
|
|
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
|
|
}
|
|
|
|
/* Wrapper function allowing the classic API to use the PSA RNG.
|
|
*
|
|
* `mbedtls_psa_get_random(MBEDTLS_PSA_RANDOM_STATE, ...)` calls
|
|
* `psa_generate_random(...)`. The state parameter is ignored since the
|
|
* PSA API doesn't support passing an explicit state.
|
|
*
|
|
* In the non-external case, psa_generate_random() calls an
|
|
* `mbedtls_xxx_drbg_random` function which has exactly the same signature
|
|
* and semantics as mbedtls_psa_get_random(). As an optimization,
|
|
* instead of doing this back-and-forth between the PSA API and the
|
|
* classic API, psa_crypto_random_impl.h defines `mbedtls_psa_get_random`
|
|
* as a constant function pointer to `mbedtls_xxx_drbg_random`.
|
|
*/
|
|
#if defined (MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
|
|
int mbedtls_psa_get_random( void *p_rng,
|
|
unsigned char *output,
|
|
size_t output_size )
|
|
{
|
|
/* This function takes a pointer to the RNG state because that's what
|
|
* classic mbedtls functions using an RNG expect. The PSA RNG manages
|
|
* its own state internally and doesn't let the caller access that state.
|
|
* So we just ignore the state parameter, and in practice we'll pass
|
|
* NULL. */
|
|
(void) p_rng;
|
|
psa_status_t status = psa_generate_random( output, output_size );
|
|
if( status == PSA_SUCCESS )
|
|
return( 0 );
|
|
else
|
|
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
|
|
|
|
#if defined(MBEDTLS_PSA_INJECT_ENTROPY)
|
|
#include "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 */
|
|
|
|
/** Validate the key type and size for key generation
|
|
*
|
|
* \param type The key type
|
|
* \param bits The number of bits of the key
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* The key type and size are valid.
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
* The size in bits of the key is not valid.
|
|
* \retval #PSA_ERROR_NOT_SUPPORTED
|
|
* The type and/or the size in bits of the key or the combination of
|
|
* the two is not supported.
|
|
*/
|
|
static psa_status_t psa_validate_key_type_and_size_for_key_generation(
|
|
psa_key_type_t type, size_t bits )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( key_type_is_raw_bytes( type ) )
|
|
{
|
|
status = validate_unstructured_key_bit_size( type, bits );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
}
|
|
else
|
|
#if defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR)
|
|
if( PSA_KEY_TYPE_IS_RSA( type ) && PSA_KEY_TYPE_IS_KEY_PAIR( type ) )
|
|
{
|
|
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 );
|
|
}
|
|
else
|
|
#endif /* defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR) */
|
|
|
|
#if defined(PSA_WANT_KEY_TYPE_ECC_KEY_PAIR)
|
|
if( PSA_KEY_TYPE_IS_ECC( type ) && PSA_KEY_TYPE_IS_KEY_PAIR( type ) )
|
|
{
|
|
/* To avoid empty block, return successfully here. */
|
|
return( PSA_SUCCESS );
|
|
}
|
|
else
|
|
#endif /* defined(PSA_WANT_KEY_TYPE_ECC_KEY_PAIR) */
|
|
{
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t psa_generate_key_internal(
|
|
const psa_key_attributes_t *attributes,
|
|
uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_type_t type = attributes->core.type;
|
|
|
|
if( ( attributes->domain_parameters == NULL ) &&
|
|
( attributes->domain_parameters_size != 0 ) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
if( key_type_is_raw_bytes( type ) )
|
|
{
|
|
status = psa_generate_random( key_buffer, key_buffer_size );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES)
|
|
if( type == PSA_KEY_TYPE_DES )
|
|
psa_des_set_key_parity( key_buffer, key_buffer_size );
|
|
#endif /* MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES */
|
|
}
|
|
else
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) && \
|
|
defined(MBEDTLS_GENPRIME)
|
|
if ( type == PSA_KEY_TYPE_RSA_KEY_PAIR )
|
|
{
|
|
return( mbedtls_psa_rsa_generate_key( attributes,
|
|
key_buffer,
|
|
key_buffer_size,
|
|
key_buffer_length ) );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR)
|
|
* defined(MBEDTLS_GENPRIME) */
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR)
|
|
if ( PSA_KEY_TYPE_IS_ECC( type ) && PSA_KEY_TYPE_IS_KEY_PAIR( type ) )
|
|
{
|
|
return( mbedtls_psa_ecp_generate_key( attributes,
|
|
key_buffer,
|
|
key_buffer_size,
|
|
key_buffer_length ) );
|
|
}
|
|
else
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) */
|
|
{
|
|
(void)key_buffer_length;
|
|
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;
|
|
size_t key_buffer_size;
|
|
|
|
*key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
|
|
/* 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,
|
|
&slot, &driver );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* In the case of a transparent key or an opaque key stored in local
|
|
* storage (thus not in the case of generating a key in a secure element
|
|
* or cryptoprocessor with storage), we have to allocate a buffer to
|
|
* hold the generated key material. */
|
|
if( slot->key.data == NULL )
|
|
{
|
|
if ( PSA_KEY_LIFETIME_GET_LOCATION( attributes->core.lifetime ) ==
|
|
PSA_KEY_LOCATION_LOCAL_STORAGE )
|
|
{
|
|
status = psa_validate_key_type_and_size_for_key_generation(
|
|
attributes->core.type, attributes->core.bits );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
key_buffer_size = PSA_EXPORT_KEY_OUTPUT_SIZE(
|
|
attributes->core.type,
|
|
attributes->core.bits );
|
|
}
|
|
else
|
|
{
|
|
status = psa_driver_wrapper_get_key_buffer_size(
|
|
attributes, &key_buffer_size );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_allocate_buffer_to_slot( slot, key_buffer_size );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_driver_wrapper_generate_key( attributes,
|
|
slot->key.data, slot->key.bytes, &slot->key.bytes );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
psa_remove_key_data_from_memory( slot );
|
|
|
|
exit:
|
|
if( status == PSA_SUCCESS )
|
|
status = psa_finish_key_creation( slot, driver, key );
|
|
if( status != PSA_SUCCESS )
|
|
psa_fail_key_creation( slot, driver );
|
|
|
|
return( status );
|
|
}
|
|
|
|
/****************************************************************/
|
|
/* Module setup */
|
|
/****************************************************************/
|
|
|
|
#if !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
|
|
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.rng.entropy_init = entropy_init;
|
|
global_data.rng.entropy_free = entropy_free;
|
|
return( PSA_SUCCESS );
|
|
}
|
|
#endif /* !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) */
|
|
|
|
void mbedtls_psa_crypto_free( void )
|
|
{
|
|
psa_wipe_all_key_slots( );
|
|
if( global_data.rng_state != RNG_NOT_INITIALIZED )
|
|
{
|
|
mbedtls_psa_random_free( &global_data.rng );
|
|
}
|
|
/* 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_DATA_INVALID );
|
|
}
|
|
}
|
|
#endif /* PSA_CRYPTO_STORAGE_HAS_TRANSACTIONS */
|
|
|
|
psa_status_t psa_crypto_init( void )
|
|
{
|
|
psa_status_t status;
|
|
|
|
/* Double initialization is explicitly allowed. */
|
|
if( global_data.initialized != 0 )
|
|
return( PSA_SUCCESS );
|
|
|
|
/* Initialize and seed the random generator. */
|
|
mbedtls_psa_random_init( &global_data.rng );
|
|
global_data.rng_state = RNG_INITIALIZED;
|
|
status = mbedtls_psa_random_seed( &global_data.rng );
|
|
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 */
|