1566 lines
48 KiB
C
1566 lines
48 KiB
C
/*
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* Public Key abstraction layer: wrapper functions
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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_PK_C)
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#include "pk_wrap.h"
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#include "mbedtls/error.h"
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/* Even if RSA not activated, for the sake of RSA-alt */
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#include "mbedtls/rsa.h"
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#include <string.h>
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#if defined(MBEDTLS_ECP_C)
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#include "mbedtls/ecp.h"
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#endif
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#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECP_C)
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#include "pkwrite.h"
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#endif
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#if defined(MBEDTLS_ECDSA_C)
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#include "mbedtls/ecdsa.h"
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#include "mbedtls/asn1write.h"
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#endif
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#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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#include "mbedtls/platform_util.h"
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#include "psa/crypto.h"
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#include "mbedtls/psa_util.h"
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#include "mbedtls/asn1.h"
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdlib.h>
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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 <limits.h>
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#include <stdint.h>
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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int mbedtls_pk_error_from_psa( psa_status_t status )
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{
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switch( status )
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{
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case PSA_SUCCESS:
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return( 0 );
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case PSA_ERROR_INVALID_HANDLE:
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return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
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case PSA_ERROR_NOT_PERMITTED:
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return( MBEDTLS_ERR_ERROR_GENERIC_ERROR );
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case PSA_ERROR_BUFFER_TOO_SMALL:
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return( MBEDTLS_ERR_PK_BUFFER_TOO_SMALL );
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case PSA_ERROR_NOT_SUPPORTED:
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return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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case PSA_ERROR_INVALID_ARGUMENT:
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return( MBEDTLS_ERR_PK_INVALID_ALG );
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case PSA_ERROR_INSUFFICIENT_MEMORY:
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return( MBEDTLS_ERR_PK_ALLOC_FAILED );
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case PSA_ERROR_BAD_STATE:
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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case PSA_ERROR_COMMUNICATION_FAILURE:
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case PSA_ERROR_HARDWARE_FAILURE:
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return( MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED );
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case PSA_ERROR_DATA_CORRUPT:
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case PSA_ERROR_DATA_INVALID:
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case PSA_ERROR_STORAGE_FAILURE:
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return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
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case PSA_ERROR_CORRUPTION_DETECTED:
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return( MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED );
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default:
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return( MBEDTLS_ERR_ERROR_GENERIC_ERROR );
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}
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}
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#if defined(PSA_WANT_KEY_TYPE_RSA_PUBLIC_KEY)
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int mbedtls_pk_error_from_psa_rsa( psa_status_t status )
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{
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switch( status )
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{
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case PSA_ERROR_NOT_PERMITTED:
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case PSA_ERROR_INVALID_ARGUMENT:
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case PSA_ERROR_INVALID_HANDLE:
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return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
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case PSA_ERROR_BUFFER_TOO_SMALL:
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return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
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case PSA_ERROR_INSUFFICIENT_ENTROPY:
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return( MBEDTLS_ERR_RSA_RNG_FAILED );
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case PSA_ERROR_INVALID_SIGNATURE:
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return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
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case PSA_ERROR_INVALID_PADDING:
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return( MBEDTLS_ERR_RSA_INVALID_PADDING );
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default:
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return( mbedtls_pk_error_from_psa( status ) );
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}
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}
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#endif
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#endif /* MBEDTLS_PSA_CRYPTO_C */
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#if defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY)
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int mbedtls_pk_error_from_psa_ecdsa( psa_status_t status )
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{
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switch( status )
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{
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case PSA_ERROR_NOT_PERMITTED:
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case PSA_ERROR_INVALID_ARGUMENT:
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return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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case PSA_ERROR_INVALID_HANDLE:
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return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
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case PSA_ERROR_BUFFER_TOO_SMALL:
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return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
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case PSA_ERROR_INSUFFICIENT_ENTROPY:
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return( MBEDTLS_ERR_ECP_RANDOM_FAILED );
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case PSA_ERROR_INVALID_SIGNATURE:
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return( MBEDTLS_ERR_ECP_VERIFY_FAILED );
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default:
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return( mbedtls_pk_error_from_psa( status ) );
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}
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}
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#endif /* PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY */
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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#if defined(MBEDTLS_RSA_C)
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static int rsa_can_do( mbedtls_pk_type_t type )
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{
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return( type == MBEDTLS_PK_RSA ||
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type == MBEDTLS_PK_RSASSA_PSS );
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}
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static size_t rsa_get_bitlen( const void *ctx )
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{
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const mbedtls_rsa_context * rsa = (const mbedtls_rsa_context *) ctx;
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return( 8 * mbedtls_rsa_get_len( rsa ) );
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}
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
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const unsigned char *sig, size_t sig_len )
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{
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mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
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psa_status_t status;
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mbedtls_pk_context key;
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int key_len;
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unsigned char buf[MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES];
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psa_algorithm_t psa_alg_md =
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PSA_ALG_RSA_PKCS1V15_SIGN( mbedtls_psa_translate_md( md_alg ) );
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size_t rsa_len = mbedtls_rsa_get_len( rsa );
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#if SIZE_MAX > UINT_MAX
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if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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#endif /* SIZE_MAX > UINT_MAX */
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if( sig_len < rsa_len )
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return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
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/* mbedtls_pk_write_pubkey_der() expects a full PK context;
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* re-construct one to make it happy */
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key.pk_info = &mbedtls_rsa_info;
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key.pk_ctx = ctx;
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key_len = mbedtls_pk_write_pubkey_der( &key, buf, sizeof( buf ) );
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if( key_len <= 0 )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_VERIFY_HASH );
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psa_set_key_algorithm( &attributes, psa_alg_md );
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psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_PUBLIC_KEY );
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status = psa_import_key( &attributes,
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buf + sizeof( buf ) - key_len, key_len,
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&key_id );
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if( status != PSA_SUCCESS )
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{
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ret = mbedtls_pk_error_from_psa( status );
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goto cleanup;
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}
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status = psa_verify_hash( key_id, psa_alg_md, hash, hash_len,
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sig, sig_len );
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if( status != PSA_SUCCESS )
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{
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ret = mbedtls_pk_error_from_psa_rsa( status );
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goto cleanup;
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}
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ret = 0;
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cleanup:
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status = psa_destroy_key( key_id );
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if( ret == 0 && status != PSA_SUCCESS )
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ret = mbedtls_pk_error_from_psa( status );
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return( ret );
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}
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#else
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static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
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const unsigned char *sig, size_t sig_len )
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
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size_t rsa_len = mbedtls_rsa_get_len( rsa );
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#if SIZE_MAX > UINT_MAX
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if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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#endif /* SIZE_MAX > UINT_MAX */
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if( sig_len < rsa_len )
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return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
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if( ( ret = mbedtls_rsa_pkcs1_verify( rsa, md_alg,
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(unsigned int) hash_len,
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hash, sig ) ) != 0 )
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return( ret );
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/* The buffer contains a valid signature followed by extra data.
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* We have a special error code for that so that so that callers can
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* use mbedtls_pk_verify() to check "Does the buffer start with a
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* valid signature?" and not just "Does the buffer contain a valid
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* signature?". */
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if( sig_len > rsa_len )
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return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
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return( 0 );
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}
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#endif
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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int mbedtls_pk_psa_rsa_sign_ext( psa_algorithm_t alg,
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mbedtls_rsa_context *rsa_ctx,
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const unsigned char *hash, size_t hash_len,
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unsigned char *sig, size_t sig_size,
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size_t *sig_len )
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
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psa_status_t status;
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mbedtls_pk_context key;
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int key_len;
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unsigned char buf[MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES];
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mbedtls_pk_info_t pk_info = mbedtls_rsa_info;
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*sig_len = mbedtls_rsa_get_len( rsa_ctx );
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if( sig_size < *sig_len )
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return( MBEDTLS_ERR_PK_BUFFER_TOO_SMALL );
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/* mbedtls_pk_write_key_der() expects a full PK context;
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* re-construct one to make it happy */
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key.pk_info = &pk_info;
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key.pk_ctx = rsa_ctx;
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key_len = mbedtls_pk_write_key_der( &key, buf, sizeof( buf ) );
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if( key_len <= 0 )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH );
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psa_set_key_algorithm( &attributes, alg );
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psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_KEY_PAIR );
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status = psa_import_key( &attributes,
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buf + sizeof( buf ) - key_len, key_len,
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&key_id );
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if( status != PSA_SUCCESS )
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{
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ret = mbedtls_pk_error_from_psa( status );
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goto cleanup;
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}
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status = psa_sign_hash( key_id, alg, hash, hash_len,
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sig, sig_size, sig_len );
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if( status != PSA_SUCCESS )
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{
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ret = mbedtls_pk_error_from_psa_rsa( status );
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goto cleanup;
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}
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ret = 0;
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cleanup:
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status = psa_destroy_key( key_id );
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if( ret == 0 && status != PSA_SUCCESS )
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ret = mbedtls_pk_error_from_psa( status );
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return( ret );
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}
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#endif /* MBEDTLS_PSA_CRYPTO_C */
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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static int rsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
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unsigned char *sig, size_t sig_size, size_t *sig_len,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
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{
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((void) f_rng);
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((void) p_rng);
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psa_algorithm_t psa_md_alg;
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psa_md_alg = mbedtls_psa_translate_md( md_alg );
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if( psa_md_alg == 0 )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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return( mbedtls_pk_psa_rsa_sign_ext( PSA_ALG_RSA_PKCS1V15_SIGN(
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psa_md_alg ),
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ctx, hash, hash_len,
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sig, sig_size, sig_len ) );
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}
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#else
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static int rsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
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unsigned char *sig, size_t sig_size, size_t *sig_len,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
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{
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mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
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#if SIZE_MAX > UINT_MAX
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if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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#endif /* SIZE_MAX > UINT_MAX */
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*sig_len = mbedtls_rsa_get_len( rsa );
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if( sig_size < *sig_len )
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return( MBEDTLS_ERR_PK_BUFFER_TOO_SMALL );
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return( mbedtls_rsa_pkcs1_sign( rsa, f_rng, p_rng,
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md_alg, (unsigned int) hash_len,
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hash, sig ) );
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}
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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static int rsa_decrypt_wrap( void *ctx,
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const unsigned char *input, size_t ilen,
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unsigned char *output, size_t *olen, size_t osize,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
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{
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mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
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psa_status_t status;
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mbedtls_pk_context key;
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int key_len;
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unsigned char buf[MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES];
|
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|
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((void) f_rng);
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((void) p_rng);
|
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|
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#if !defined(MBEDTLS_RSA_ALT)
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if( rsa->padding != MBEDTLS_RSA_PKCS_V15 )
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return( MBEDTLS_ERR_RSA_INVALID_PADDING );
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#endif /* !MBEDTLS_RSA_ALT */
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|
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if( ilen != mbedtls_rsa_get_len( rsa ) )
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return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
|
|
|
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/* mbedtls_pk_write_key_der() expects a full PK context;
|
|
* re-construct one to make it happy */
|
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key.pk_info = &mbedtls_rsa_info;
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key.pk_ctx = ctx;
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key_len = mbedtls_pk_write_key_der( &key, buf, sizeof( buf ) );
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if( key_len <= 0 )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
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|
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psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_KEY_PAIR );
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psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_DECRYPT );
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psa_set_key_algorithm( &attributes, PSA_ALG_RSA_PKCS1V15_CRYPT );
|
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|
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status = psa_import_key( &attributes,
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buf + sizeof( buf ) - key_len, key_len,
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&key_id );
|
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if( status != PSA_SUCCESS )
|
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{
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ret = mbedtls_pk_error_from_psa( status );
|
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goto cleanup;
|
|
}
|
|
|
|
status = psa_asymmetric_decrypt( key_id, PSA_ALG_RSA_PKCS1V15_CRYPT,
|
|
input, ilen,
|
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NULL, 0,
|
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output, osize, olen );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
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ret = mbedtls_pk_error_from_psa_rsa( status );
|
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goto cleanup;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
cleanup:
|
|
mbedtls_platform_zeroize( buf, sizeof( buf ) );
|
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status = psa_destroy_key( key_id );
|
|
if( ret == 0 && status != PSA_SUCCESS )
|
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ret = mbedtls_pk_error_from_psa( status );
|
|
|
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return( ret );
|
|
}
|
|
#else
|
|
static int rsa_decrypt_wrap( void *ctx,
|
|
const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen, size_t osize,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
|
|
|
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if( ilen != mbedtls_rsa_get_len( rsa ) )
|
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return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
|
|
|
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return( mbedtls_rsa_pkcs1_decrypt( rsa, f_rng, p_rng,
|
|
olen, input, output, osize ) );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
static int rsa_encrypt_wrap( void *ctx,
|
|
const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen, size_t osize,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
|
|
psa_status_t status;
|
|
mbedtls_pk_context key;
|
|
int key_len;
|
|
unsigned char buf[MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES];
|
|
|
|
((void) f_rng);
|
|
((void) p_rng);
|
|
|
|
#if !defined(MBEDTLS_RSA_ALT)
|
|
if( rsa->padding != MBEDTLS_RSA_PKCS_V15 )
|
|
return( MBEDTLS_ERR_RSA_INVALID_PADDING );
|
|
#endif
|
|
|
|
if( mbedtls_rsa_get_len( rsa ) > osize )
|
|
return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
|
|
|
|
/* mbedtls_pk_write_pubkey_der() expects a full PK context;
|
|
* re-construct one to make it happy */
|
|
key.pk_info = &mbedtls_rsa_info;
|
|
key.pk_ctx = ctx;
|
|
key_len = mbedtls_pk_write_pubkey_der( &key, buf, sizeof( buf ) );
|
|
if( key_len <= 0 )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_ENCRYPT );
|
|
psa_set_key_algorithm( &attributes, PSA_ALG_RSA_PKCS1V15_CRYPT );
|
|
psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_PUBLIC_KEY );
|
|
|
|
status = psa_import_key( &attributes,
|
|
buf + sizeof( buf ) - key_len, key_len,
|
|
&key_id );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = mbedtls_pk_error_from_psa( status );
|
|
goto cleanup;
|
|
}
|
|
|
|
status = psa_asymmetric_encrypt( key_id, PSA_ALG_RSA_PKCS1V15_CRYPT,
|
|
input, ilen,
|
|
NULL, 0,
|
|
output, osize, olen );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = mbedtls_pk_error_from_psa_rsa( status );
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
cleanup:
|
|
status = psa_destroy_key( key_id );
|
|
if( ret == 0 && status != PSA_SUCCESS )
|
|
ret = mbedtls_pk_error_from_psa( status );
|
|
|
|
return( ret );
|
|
}
|
|
#else
|
|
static int rsa_encrypt_wrap( void *ctx,
|
|
const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen, size_t osize,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
|
|
*olen = mbedtls_rsa_get_len( rsa );
|
|
|
|
if( *olen > osize )
|
|
return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
|
|
|
|
return( mbedtls_rsa_pkcs1_encrypt( rsa, f_rng, p_rng,
|
|
ilen, input, output ) );
|
|
}
|
|
#endif
|
|
|
|
static int rsa_check_pair_wrap( const void *pub, const void *prv,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng )
|
|
{
|
|
(void) f_rng;
|
|
(void) p_rng;
|
|
return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub,
|
|
(const mbedtls_rsa_context *) prv ) );
|
|
}
|
|
|
|
static void *rsa_alloc_wrap( void )
|
|
{
|
|
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) );
|
|
|
|
if( ctx != NULL )
|
|
mbedtls_rsa_init( (mbedtls_rsa_context *) ctx );
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void rsa_free_wrap( void *ctx )
|
|
{
|
|
mbedtls_rsa_free( (mbedtls_rsa_context *) ctx );
|
|
mbedtls_free( ctx );
|
|
}
|
|
|
|
static void rsa_debug( const void *ctx, mbedtls_pk_debug_item *items )
|
|
{
|
|
#if defined(MBEDTLS_RSA_ALT)
|
|
/* Not supported */
|
|
(void) ctx;
|
|
(void) items;
|
|
#else
|
|
items->type = MBEDTLS_PK_DEBUG_MPI;
|
|
items->name = "rsa.N";
|
|
items->value = &( ((mbedtls_rsa_context *) ctx)->N );
|
|
|
|
items++;
|
|
|
|
items->type = MBEDTLS_PK_DEBUG_MPI;
|
|
items->name = "rsa.E";
|
|
items->value = &( ((mbedtls_rsa_context *) ctx)->E );
|
|
#endif
|
|
}
|
|
|
|
const mbedtls_pk_info_t mbedtls_rsa_info = {
|
|
MBEDTLS_PK_RSA,
|
|
"RSA",
|
|
rsa_get_bitlen,
|
|
rsa_can_do,
|
|
rsa_verify_wrap,
|
|
rsa_sign_wrap,
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
NULL,
|
|
NULL,
|
|
#endif
|
|
rsa_decrypt_wrap,
|
|
rsa_encrypt_wrap,
|
|
rsa_check_pair_wrap,
|
|
rsa_alloc_wrap,
|
|
rsa_free_wrap,
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
NULL,
|
|
NULL,
|
|
#endif
|
|
rsa_debug,
|
|
};
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
/*
|
|
* Generic EC key
|
|
*/
|
|
static int eckey_can_do( mbedtls_pk_type_t type )
|
|
{
|
|
return( type == MBEDTLS_PK_ECKEY ||
|
|
type == MBEDTLS_PK_ECKEY_DH ||
|
|
type == MBEDTLS_PK_ECDSA );
|
|
}
|
|
|
|
static size_t eckey_get_bitlen( const void *ctx )
|
|
{
|
|
return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits );
|
|
}
|
|
|
|
#if defined(MBEDTLS_ECDSA_C)
|
|
/* Forward declarations */
|
|
static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len );
|
|
|
|
static int ecdsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
|
|
|
|
static int eckey_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_ecdsa_context ecdsa;
|
|
|
|
mbedtls_ecdsa_init( &ecdsa );
|
|
|
|
if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
|
|
ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );
|
|
|
|
mbedtls_ecdsa_free( &ecdsa );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
static int eckey_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_ecdsa_context ecdsa;
|
|
|
|
mbedtls_ecdsa_init( &ecdsa );
|
|
|
|
if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
|
|
ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len,
|
|
sig, sig_size, sig_len,
|
|
f_rng, p_rng );
|
|
|
|
mbedtls_ecdsa_free( &ecdsa );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_ECP_RESTARTABLE)
|
|
/* Forward declarations */
|
|
static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len,
|
|
void *rs_ctx );
|
|
|
|
static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
|
|
void *rs_ctx );
|
|
|
|
/*
|
|
* Restart context for ECDSA operations with ECKEY context
|
|
*
|
|
* We need to store an actual ECDSA context, as we need to pass the same to
|
|
* the underlying ecdsa function, so we can't create it on the fly every time.
|
|
*/
|
|
typedef struct
|
|
{
|
|
mbedtls_ecdsa_restart_ctx ecdsa_rs;
|
|
mbedtls_ecdsa_context ecdsa_ctx;
|
|
} eckey_restart_ctx;
|
|
|
|
static void *eckey_rs_alloc( void )
|
|
{
|
|
eckey_restart_ctx *rs_ctx;
|
|
|
|
void *ctx = mbedtls_calloc( 1, sizeof( eckey_restart_ctx ) );
|
|
|
|
if( ctx != NULL )
|
|
{
|
|
rs_ctx = ctx;
|
|
mbedtls_ecdsa_restart_init( &rs_ctx->ecdsa_rs );
|
|
mbedtls_ecdsa_init( &rs_ctx->ecdsa_ctx );
|
|
}
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void eckey_rs_free( void *ctx )
|
|
{
|
|
eckey_restart_ctx *rs_ctx;
|
|
|
|
if( ctx == NULL)
|
|
return;
|
|
|
|
rs_ctx = ctx;
|
|
mbedtls_ecdsa_restart_free( &rs_ctx->ecdsa_rs );
|
|
mbedtls_ecdsa_free( &rs_ctx->ecdsa_ctx );
|
|
|
|
mbedtls_free( ctx );
|
|
}
|
|
|
|
static int eckey_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len,
|
|
void *rs_ctx )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
eckey_restart_ctx *rs = rs_ctx;
|
|
|
|
/* Should never happen */
|
|
if( rs == NULL )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
/* set up our own sub-context if needed (that is, on first run) */
|
|
if( rs->ecdsa_ctx.grp.pbits == 0 )
|
|
MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );
|
|
|
|
MBEDTLS_MPI_CHK( ecdsa_verify_rs_wrap( &rs->ecdsa_ctx,
|
|
md_alg, hash, hash_len,
|
|
sig, sig_len, &rs->ecdsa_rs ) );
|
|
|
|
cleanup:
|
|
return( ret );
|
|
}
|
|
|
|
static int eckey_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
|
|
void *rs_ctx )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
eckey_restart_ctx *rs = rs_ctx;
|
|
|
|
/* Should never happen */
|
|
if( rs == NULL )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
/* set up our own sub-context if needed (that is, on first run) */
|
|
if( rs->ecdsa_ctx.grp.pbits == 0 )
|
|
MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );
|
|
|
|
MBEDTLS_MPI_CHK( ecdsa_sign_rs_wrap( &rs->ecdsa_ctx, md_alg,
|
|
hash, hash_len, sig, sig_size, sig_len,
|
|
f_rng, p_rng, &rs->ecdsa_rs ) );
|
|
|
|
cleanup:
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_ECP_RESTARTABLE */
|
|
#endif /* MBEDTLS_ECDSA_C */
|
|
|
|
static int eckey_check_pair( const void *pub, const void *prv,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng )
|
|
{
|
|
return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub,
|
|
(const mbedtls_ecp_keypair *) prv,
|
|
f_rng, p_rng ) );
|
|
}
|
|
|
|
static void *eckey_alloc_wrap( void )
|
|
{
|
|
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
|
|
|
|
if( ctx != NULL )
|
|
mbedtls_ecp_keypair_init( ctx );
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void eckey_free_wrap( void *ctx )
|
|
{
|
|
mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx );
|
|
mbedtls_free( ctx );
|
|
}
|
|
|
|
static void eckey_debug( const void *ctx, mbedtls_pk_debug_item *items )
|
|
{
|
|
items->type = MBEDTLS_PK_DEBUG_ECP;
|
|
items->name = "eckey.Q";
|
|
items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q );
|
|
}
|
|
|
|
const mbedtls_pk_info_t mbedtls_eckey_info = {
|
|
MBEDTLS_PK_ECKEY,
|
|
"EC",
|
|
eckey_get_bitlen,
|
|
eckey_can_do,
|
|
#if defined(MBEDTLS_ECDSA_C)
|
|
eckey_verify_wrap,
|
|
eckey_sign_wrap,
|
|
#if defined(MBEDTLS_ECP_RESTARTABLE)
|
|
eckey_verify_rs_wrap,
|
|
eckey_sign_rs_wrap,
|
|
#endif
|
|
#else /* MBEDTLS_ECDSA_C */
|
|
NULL,
|
|
NULL,
|
|
#endif /* MBEDTLS_ECDSA_C */
|
|
NULL,
|
|
NULL,
|
|
eckey_check_pair,
|
|
eckey_alloc_wrap,
|
|
eckey_free_wrap,
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
eckey_rs_alloc,
|
|
eckey_rs_free,
|
|
#endif
|
|
eckey_debug,
|
|
};
|
|
|
|
/*
|
|
* EC key restricted to ECDH
|
|
*/
|
|
static int eckeydh_can_do( mbedtls_pk_type_t type )
|
|
{
|
|
return( type == MBEDTLS_PK_ECKEY ||
|
|
type == MBEDTLS_PK_ECKEY_DH );
|
|
}
|
|
|
|
const mbedtls_pk_info_t mbedtls_eckeydh_info = {
|
|
MBEDTLS_PK_ECKEY_DH,
|
|
"EC_DH",
|
|
eckey_get_bitlen, /* Same underlying key structure */
|
|
eckeydh_can_do,
|
|
NULL,
|
|
NULL,
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
NULL,
|
|
NULL,
|
|
#endif
|
|
NULL,
|
|
NULL,
|
|
eckey_check_pair,
|
|
eckey_alloc_wrap, /* Same underlying key structure */
|
|
eckey_free_wrap, /* Same underlying key structure */
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
NULL,
|
|
NULL,
|
|
#endif
|
|
eckey_debug, /* Same underlying key structure */
|
|
};
|
|
#endif /* MBEDTLS_ECP_C */
|
|
|
|
#if defined(MBEDTLS_ECDSA_C)
|
|
static int ecdsa_can_do( mbedtls_pk_type_t type )
|
|
{
|
|
return( type == MBEDTLS_PK_ECDSA );
|
|
}
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
/*
|
|
* An ASN.1 encoded signature is a sequence of two ASN.1 integers. Parse one of
|
|
* those integers and convert it to the fixed-length encoding expected by PSA.
|
|
*/
|
|
static int extract_ecdsa_sig_int( unsigned char **from, const unsigned char *end,
|
|
unsigned char *to, size_t to_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t unpadded_len, padding_len;
|
|
|
|
if( ( ret = mbedtls_asn1_get_tag( from, end, &unpadded_len,
|
|
MBEDTLS_ASN1_INTEGER ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
while( unpadded_len > 0 && **from == 0x00 )
|
|
{
|
|
( *from )++;
|
|
unpadded_len--;
|
|
}
|
|
|
|
if( unpadded_len > to_len || unpadded_len == 0 )
|
|
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
|
|
|
|
padding_len = to_len - unpadded_len;
|
|
memset( to, 0x00, padding_len );
|
|
memcpy( to + padding_len, *from, unpadded_len );
|
|
( *from ) += unpadded_len;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Convert a signature from an ASN.1 sequence of two integers
|
|
* to a raw {r,s} buffer. Note: the provided sig buffer must be at least
|
|
* twice as big as int_size.
|
|
*/
|
|
static int extract_ecdsa_sig( unsigned char **p, const unsigned char *end,
|
|
unsigned char *sig, size_t int_size )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t tmp_size;
|
|
|
|
if( ( ret = mbedtls_asn1_get_tag( p, end, &tmp_size,
|
|
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
|
|
return( ret );
|
|
|
|
/* Extract r */
|
|
if( ( ret = extract_ecdsa_sig_int( p, end, sig, int_size ) ) != 0 )
|
|
return( ret );
|
|
/* Extract s */
|
|
if( ( ret = extract_ecdsa_sig_int( p, end, sig + int_size, int_size ) ) != 0 )
|
|
return( ret );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ecdsa_verify_wrap( void *ctx_arg, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len )
|
|
{
|
|
mbedtls_ecdsa_context *ctx = ctx_arg;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
|
|
psa_status_t status;
|
|
mbedtls_pk_context key;
|
|
int key_len;
|
|
unsigned char buf[MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES];
|
|
unsigned char *p;
|
|
mbedtls_pk_info_t pk_info = mbedtls_eckey_info;
|
|
psa_algorithm_t psa_sig_md = PSA_ALG_ECDSA_ANY;
|
|
size_t curve_bits;
|
|
psa_ecc_family_t curve =
|
|
mbedtls_ecc_group_to_psa( ctx->grp.id, &curve_bits );
|
|
const size_t signature_part_size = ( ctx->grp.nbits + 7 ) / 8;
|
|
((void) md_alg);
|
|
|
|
if( curve == 0 )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
/* mbedtls_pk_write_pubkey() expects a full PK context;
|
|
* re-construct one to make it happy */
|
|
key.pk_info = &pk_info;
|
|
key.pk_ctx = ctx;
|
|
p = buf + sizeof( buf );
|
|
key_len = mbedtls_pk_write_pubkey( &p, buf, &key );
|
|
if( key_len <= 0 )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
psa_set_key_type( &attributes, PSA_KEY_TYPE_ECC_PUBLIC_KEY( curve ) );
|
|
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_VERIFY_HASH );
|
|
psa_set_key_algorithm( &attributes, psa_sig_md );
|
|
|
|
status = psa_import_key( &attributes,
|
|
buf + sizeof( buf ) - key_len, key_len,
|
|
&key_id );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = mbedtls_pk_error_from_psa( status );
|
|
goto cleanup;
|
|
}
|
|
|
|
/* We don't need the exported key anymore and can
|
|
* reuse its buffer for signature extraction. */
|
|
if( 2 * signature_part_size > sizeof( buf ) )
|
|
{
|
|
ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;
|
|
goto cleanup;
|
|
}
|
|
|
|
p = (unsigned char*) sig;
|
|
if( ( ret = extract_ecdsa_sig( &p, sig + sig_len, buf,
|
|
signature_part_size ) ) != 0 )
|
|
{
|
|
goto cleanup;
|
|
}
|
|
|
|
status = psa_verify_hash( key_id, psa_sig_md,
|
|
hash, hash_len,
|
|
buf, 2 * signature_part_size );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = mbedtls_pk_error_from_psa_ecdsa( status );
|
|
goto cleanup;
|
|
}
|
|
|
|
if( p != sig + sig_len )
|
|
{
|
|
ret = MBEDTLS_ERR_PK_SIG_LEN_MISMATCH;
|
|
goto cleanup;
|
|
}
|
|
ret = 0;
|
|
|
|
cleanup:
|
|
status = psa_destroy_key( key_id );
|
|
if( ret == 0 && status != PSA_SUCCESS )
|
|
ret = mbedtls_pk_error_from_psa( status );
|
|
|
|
return( ret );
|
|
}
|
|
#else /* MBEDTLS_USE_PSA_CRYPTO */
|
|
static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
((void) md_alg);
|
|
|
|
ret = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx,
|
|
hash, hash_len, sig, sig_len );
|
|
|
|
if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
|
|
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
/*
|
|
* Simultaneously convert and move raw MPI from the beginning of a buffer
|
|
* to an ASN.1 MPI at the end of the buffer.
|
|
* See also mbedtls_asn1_write_mpi().
|
|
*
|
|
* p: pointer to the end of the output buffer
|
|
* start: start of the output buffer, and also of the mpi to write at the end
|
|
* n_len: length of the mpi to read from start
|
|
*/
|
|
static int asn1_write_mpibuf( unsigned char **p, unsigned char *start,
|
|
size_t n_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t len = 0;
|
|
|
|
if( (size_t)( *p - start ) < n_len )
|
|
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
|
|
|
|
len = n_len;
|
|
*p -= len;
|
|
memmove( *p, start, len );
|
|
|
|
/* ASN.1 DER encoding requires minimal length, so skip leading 0s.
|
|
* Neither r nor s should be 0, but as a failsafe measure, still detect
|
|
* that rather than overflowing the buffer in case of a PSA error. */
|
|
while( len > 0 && **p == 0x00 )
|
|
{
|
|
++(*p);
|
|
--len;
|
|
}
|
|
|
|
/* this is only reached if the signature was invalid */
|
|
if( len == 0 )
|
|
return( MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED );
|
|
|
|
/* if the msb is 1, ASN.1 requires that we prepend a 0.
|
|
* Neither r nor s can be 0, so we can assume len > 0 at all times. */
|
|
if( **p & 0x80 )
|
|
{
|
|
if( *p - start < 1 )
|
|
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
|
|
|
|
*--(*p) = 0x00;
|
|
len += 1;
|
|
}
|
|
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
|
|
MBEDTLS_ASN1_INTEGER ) );
|
|
|
|
return( (int) len );
|
|
}
|
|
|
|
/* Transcode signature from PSA format to ASN.1 sequence.
|
|
* See ecdsa_signature_to_asn1 in ecdsa.c, but with byte buffers instead of
|
|
* MPIs, and in-place.
|
|
*
|
|
* [in/out] sig: the signature pre- and post-transcoding
|
|
* [in/out] sig_len: signature length pre- and post-transcoding
|
|
* [int] buf_len: the available size the in/out buffer
|
|
*/
|
|
static int pk_ecdsa_sig_asn1_from_psa( unsigned char *sig, size_t *sig_len,
|
|
size_t buf_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t len = 0;
|
|
const size_t rs_len = *sig_len / 2;
|
|
unsigned char *p = sig + buf_len;
|
|
|
|
MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig + rs_len, rs_len ) );
|
|
MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig, rs_len ) );
|
|
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, sig, len ) );
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, sig,
|
|
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );
|
|
|
|
memmove( sig, p, len );
|
|
*sig_len = len;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/* Locate an ECDSA privateKey in a RFC 5915, or SEC1 Appendix C.4 ASN.1 buffer
|
|
*
|
|
* [in/out] buf: ASN.1 buffer start as input - ECDSA privateKey start as output
|
|
* [in] end: ASN.1 buffer end
|
|
* [out] key_len: the ECDSA privateKey length in bytes
|
|
*/
|
|
static int find_ecdsa_private_key( unsigned char **buf, unsigned char *end,
|
|
size_t *key_len )
|
|
{
|
|
size_t len;
|
|
int ret;
|
|
|
|
/*
|
|
* RFC 5915, or SEC1 Appendix C.4
|
|
*
|
|
* ECPrivateKey ::= SEQUENCE {
|
|
* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
|
|
* privateKey OCTET STRING,
|
|
* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
|
|
* publicKey [1] BIT STRING OPTIONAL
|
|
* }
|
|
*/
|
|
|
|
if( ( ret = mbedtls_asn1_get_tag( buf, end, &len,
|
|
MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
|
|
return( ret );
|
|
|
|
/* version */
|
|
if( ( ret = mbedtls_asn1_get_tag( buf, end, &len,
|
|
MBEDTLS_ASN1_INTEGER ) ) != 0 )
|
|
return( ret );
|
|
|
|
*buf += len;
|
|
|
|
/* privateKey */
|
|
if( ( ret = mbedtls_asn1_get_tag( buf, end, &len,
|
|
MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
|
|
return( ret );
|
|
|
|
*key_len = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ecdsa_sign_wrap( void *ctx_arg, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
mbedtls_ecdsa_context *ctx = ctx_arg;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
|
|
psa_status_t status;
|
|
mbedtls_pk_context key;
|
|
size_t key_len;
|
|
unsigned char buf[MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES];
|
|
unsigned char *p;
|
|
psa_algorithm_t psa_sig_md =
|
|
PSA_ALG_ECDSA( mbedtls_psa_translate_md( md_alg ) );
|
|
size_t curve_bits;
|
|
psa_ecc_family_t curve =
|
|
mbedtls_ecc_group_to_psa( ctx->grp.id, &curve_bits );
|
|
|
|
/* PSA has its own RNG */
|
|
((void) f_rng);
|
|
((void) p_rng);
|
|
|
|
if( curve == 0 )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
/* mbedtls_pk_write_key_der() expects a full PK context;
|
|
* re-construct one to make it happy */
|
|
key.pk_info = &mbedtls_eckey_info;
|
|
key.pk_ctx = ctx;
|
|
key_len = mbedtls_pk_write_key_der( &key, buf, sizeof( buf ) );
|
|
if( key_len <= 0 )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
p = buf + sizeof( buf ) - key_len;
|
|
ret = find_ecdsa_private_key( &p, buf + sizeof( buf ), &key_len );
|
|
if( ret != 0 )
|
|
goto cleanup;
|
|
|
|
psa_set_key_type( &attributes, PSA_KEY_TYPE_ECC_KEY_PAIR( curve ) );
|
|
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH );
|
|
psa_set_key_algorithm( &attributes, psa_sig_md );
|
|
|
|
status = psa_import_key( &attributes,
|
|
p, key_len,
|
|
&key_id );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = mbedtls_pk_error_from_psa( status );
|
|
goto cleanup;
|
|
}
|
|
|
|
status = psa_sign_hash( key_id, psa_sig_md, hash, hash_len,
|
|
sig, sig_size, sig_len );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = mbedtls_pk_error_from_psa_ecdsa( status );
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = pk_ecdsa_sig_asn1_from_psa( sig, sig_len, sig_size );
|
|
|
|
cleanup:
|
|
mbedtls_platform_zeroize( buf, sizeof( buf ) );
|
|
status = psa_destroy_key( key_id );
|
|
if( ret == 0 && status != PSA_SUCCESS )
|
|
ret = mbedtls_pk_error_from_psa( status );
|
|
|
|
return( ret );
|
|
}
|
|
#else
|
|
static int ecdsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
return( mbedtls_ecdsa_write_signature( (mbedtls_ecdsa_context *) ctx,
|
|
md_alg, hash, hash_len,
|
|
sig, sig_size, sig_len,
|
|
f_rng, p_rng ) );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ECP_RESTARTABLE)
|
|
static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len,
|
|
void *rs_ctx )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
((void) md_alg);
|
|
|
|
ret = mbedtls_ecdsa_read_signature_restartable(
|
|
(mbedtls_ecdsa_context *) ctx,
|
|
hash, hash_len, sig, sig_len,
|
|
(mbedtls_ecdsa_restart_ctx *) rs_ctx );
|
|
|
|
if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
|
|
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
|
|
void *rs_ctx )
|
|
{
|
|
return( mbedtls_ecdsa_write_signature_restartable(
|
|
(mbedtls_ecdsa_context *) ctx,
|
|
md_alg, hash, hash_len, sig, sig_size, sig_len, f_rng, p_rng,
|
|
(mbedtls_ecdsa_restart_ctx *) rs_ctx ) );
|
|
|
|
}
|
|
#endif /* MBEDTLS_ECP_RESTARTABLE */
|
|
|
|
static void *ecdsa_alloc_wrap( void )
|
|
{
|
|
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_context ) );
|
|
|
|
if( ctx != NULL )
|
|
mbedtls_ecdsa_init( (mbedtls_ecdsa_context *) ctx );
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void ecdsa_free_wrap( void *ctx )
|
|
{
|
|
mbedtls_ecdsa_free( (mbedtls_ecdsa_context *) ctx );
|
|
mbedtls_free( ctx );
|
|
}
|
|
|
|
#if defined(MBEDTLS_ECP_RESTARTABLE)
|
|
static void *ecdsa_rs_alloc( void )
|
|
{
|
|
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_restart_ctx ) );
|
|
|
|
if( ctx != NULL )
|
|
mbedtls_ecdsa_restart_init( ctx );
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void ecdsa_rs_free( void *ctx )
|
|
{
|
|
mbedtls_ecdsa_restart_free( ctx );
|
|
mbedtls_free( ctx );
|
|
}
|
|
#endif /* MBEDTLS_ECP_RESTARTABLE */
|
|
|
|
const mbedtls_pk_info_t mbedtls_ecdsa_info = {
|
|
MBEDTLS_PK_ECDSA,
|
|
"ECDSA",
|
|
eckey_get_bitlen, /* Compatible key structures */
|
|
ecdsa_can_do,
|
|
ecdsa_verify_wrap,
|
|
ecdsa_sign_wrap,
|
|
#if defined(MBEDTLS_ECP_RESTARTABLE)
|
|
ecdsa_verify_rs_wrap,
|
|
ecdsa_sign_rs_wrap,
|
|
#endif
|
|
NULL,
|
|
NULL,
|
|
eckey_check_pair, /* Compatible key structures */
|
|
ecdsa_alloc_wrap,
|
|
ecdsa_free_wrap,
|
|
#if defined(MBEDTLS_ECP_RESTARTABLE)
|
|
ecdsa_rs_alloc,
|
|
ecdsa_rs_free,
|
|
#endif
|
|
eckey_debug, /* Compatible key structures */
|
|
};
|
|
#endif /* MBEDTLS_ECDSA_C */
|
|
|
|
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
|
|
/*
|
|
* Support for alternative RSA-private implementations
|
|
*/
|
|
|
|
static int rsa_alt_can_do( mbedtls_pk_type_t type )
|
|
{
|
|
return( type == MBEDTLS_PK_RSA );
|
|
}
|
|
|
|
static size_t rsa_alt_get_bitlen( const void *ctx )
|
|
{
|
|
const mbedtls_rsa_alt_context *rsa_alt = (const mbedtls_rsa_alt_context *) ctx;
|
|
|
|
return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
|
|
}
|
|
|
|
static int rsa_alt_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
|
|
|
|
#if SIZE_MAX > UINT_MAX
|
|
if( UINT_MAX < hash_len )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
#endif /* SIZE_MAX > UINT_MAX */
|
|
|
|
*sig_len = rsa_alt->key_len_func( rsa_alt->key );
|
|
if( *sig_len > MBEDTLS_PK_SIGNATURE_MAX_SIZE )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
if( *sig_len > sig_size )
|
|
return( MBEDTLS_ERR_PK_BUFFER_TOO_SMALL );
|
|
|
|
return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng,
|
|
md_alg, (unsigned int) hash_len, hash, sig ) );
|
|
}
|
|
|
|
static int rsa_alt_decrypt_wrap( void *ctx,
|
|
const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen, size_t osize,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
|
|
|
|
((void) f_rng);
|
|
((void) p_rng);
|
|
|
|
if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
|
|
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
|
|
|
|
return( rsa_alt->decrypt_func( rsa_alt->key,
|
|
olen, input, output, osize ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
static int rsa_alt_check_pair( const void *pub, const void *prv,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng )
|
|
{
|
|
unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
|
|
unsigned char hash[32];
|
|
size_t sig_len = 0;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( rsa_alt_get_bitlen( prv ) != rsa_get_bitlen( pub ) )
|
|
return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
|
|
|
|
memset( hash, 0x2a, sizeof( hash ) );
|
|
|
|
if( ( ret = rsa_alt_sign_wrap( (void *) prv, MBEDTLS_MD_NONE,
|
|
hash, sizeof( hash ),
|
|
sig, sizeof( sig ), &sig_len,
|
|
f_rng, p_rng ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
if( rsa_verify_wrap( (void *) pub, MBEDTLS_MD_NONE,
|
|
hash, sizeof( hash ), sig, sig_len ) != 0 )
|
|
{
|
|
return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
static void *rsa_alt_alloc_wrap( void )
|
|
{
|
|
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_alt_context ) );
|
|
|
|
if( ctx != NULL )
|
|
memset( ctx, 0, sizeof( mbedtls_rsa_alt_context ) );
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void rsa_alt_free_wrap( void *ctx )
|
|
{
|
|
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_rsa_alt_context ) );
|
|
mbedtls_free( ctx );
|
|
}
|
|
|
|
const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
|
|
MBEDTLS_PK_RSA_ALT,
|
|
"RSA-alt",
|
|
rsa_alt_get_bitlen,
|
|
rsa_alt_can_do,
|
|
NULL,
|
|
rsa_alt_sign_wrap,
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
NULL,
|
|
NULL,
|
|
#endif
|
|
rsa_alt_decrypt_wrap,
|
|
NULL,
|
|
#if defined(MBEDTLS_RSA_C)
|
|
rsa_alt_check_pair,
|
|
#else
|
|
NULL,
|
|
#endif
|
|
rsa_alt_alloc_wrap,
|
|
rsa_alt_free_wrap,
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
NULL,
|
|
NULL,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
|
|
static void *pk_opaque_alloc_wrap( void )
|
|
{
|
|
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_svc_key_id_t ) );
|
|
|
|
/* no _init() function to call, an calloc() already zeroized */
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void pk_opaque_free_wrap( void *ctx )
|
|
{
|
|
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_svc_key_id_t ) );
|
|
mbedtls_free( ctx );
|
|
}
|
|
|
|
static size_t pk_opaque_get_bitlen( const void *ctx )
|
|
{
|
|
const mbedtls_svc_key_id_t *key = (const mbedtls_svc_key_id_t *) ctx;
|
|
size_t bits;
|
|
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
|
|
if( PSA_SUCCESS != psa_get_key_attributes( *key, &attributes ) )
|
|
return( 0 );
|
|
|
|
bits = psa_get_key_bits( &attributes );
|
|
psa_reset_key_attributes( &attributes );
|
|
return( bits );
|
|
}
|
|
|
|
static int pk_opaque_can_do( mbedtls_pk_type_t type )
|
|
{
|
|
/* For now opaque PSA keys can only wrap ECC keypairs,
|
|
* as checked by setup_psa().
|
|
* Also, ECKEY_DH does not really make sense with the current API. */
|
|
return( type == MBEDTLS_PK_ECKEY ||
|
|
type == MBEDTLS_PK_ECDSA );
|
|
}
|
|
|
|
static int pk_opaque_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
#if !defined(MBEDTLS_ECDSA_C)
|
|
((void) ctx);
|
|
((void) md_alg);
|
|
((void) hash);
|
|
((void) hash_len);
|
|
((void) sig);
|
|
((void) sig_size);
|
|
((void) sig_len);
|
|
((void) f_rng);
|
|
((void) p_rng);
|
|
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
|
|
#else /* !MBEDTLS_ECDSA_C */
|
|
const mbedtls_svc_key_id_t *key = (const mbedtls_svc_key_id_t *) ctx;
|
|
psa_algorithm_t alg = PSA_ALG_ECDSA( mbedtls_psa_translate_md( md_alg ) );
|
|
psa_status_t status;
|
|
|
|
/* PSA has its own RNG */
|
|
(void) f_rng;
|
|
(void) p_rng;
|
|
|
|
/* make the signature */
|
|
status = psa_sign_hash( *key, alg, hash, hash_len,
|
|
sig, sig_size, sig_len );
|
|
if( status != PSA_SUCCESS )
|
|
return( mbedtls_pk_error_from_psa_ecdsa( status ) );
|
|
|
|
/* transcode it to ASN.1 sequence */
|
|
return( pk_ecdsa_sig_asn1_from_psa( sig, sig_len, sig_size ) );
|
|
#endif /* !MBEDTLS_ECDSA_C */
|
|
}
|
|
|
|
const mbedtls_pk_info_t mbedtls_pk_opaque_info = {
|
|
MBEDTLS_PK_OPAQUE,
|
|
"Opaque",
|
|
pk_opaque_get_bitlen,
|
|
pk_opaque_can_do,
|
|
NULL, /* verify - will be done later */
|
|
pk_opaque_sign_wrap,
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
NULL, /* restartable verify - not relevant */
|
|
NULL, /* restartable sign - not relevant */
|
|
#endif
|
|
NULL, /* decrypt - will be done later */
|
|
NULL, /* encrypt - will be done later */
|
|
NULL, /* check_pair - could be done later or left NULL */
|
|
pk_opaque_alloc_wrap,
|
|
pk_opaque_free_wrap,
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
NULL, /* restart alloc - not relevant */
|
|
NULL, /* restart free - not relevant */
|
|
#endif
|
|
NULL, /* debug - could be done later, or even left NULL */
|
|
};
|
|
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
#endif /* MBEDTLS_PK_C */
|