802 lines
25 KiB
C
802 lines
25 KiB
C
/*
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* Public Key abstraction layer
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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 "mbedtls/pk.h"
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#include "pk_wrap.h"
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#include "pkwrite.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#if defined(MBEDTLS_RSA_C)
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#include "mbedtls/rsa.h"
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#endif
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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_ECDSA_C)
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#include "mbedtls/ecdsa.h"
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#endif
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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#include "mbedtls/psa_util.h"
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#endif
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#include <limits.h>
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#include <stdint.h>
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/* Parameter validation macros based on platform_util.h */
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#define PK_VALIDATE_RET( cond ) \
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MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_PK_BAD_INPUT_DATA )
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#define PK_VALIDATE( cond ) \
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MBEDTLS_INTERNAL_VALIDATE( cond )
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/*
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* Initialise a mbedtls_pk_context
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*/
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void mbedtls_pk_init( mbedtls_pk_context *ctx )
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{
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PK_VALIDATE( ctx != NULL );
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ctx->pk_info = NULL;
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ctx->pk_ctx = NULL;
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}
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/*
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* Free (the components of) a mbedtls_pk_context
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*/
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void mbedtls_pk_free( mbedtls_pk_context *ctx )
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{
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if( ctx == NULL )
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return;
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if ( ctx->pk_info != NULL )
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ctx->pk_info->ctx_free_func( ctx->pk_ctx );
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mbedtls_platform_zeroize( ctx, sizeof( mbedtls_pk_context ) );
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}
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#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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/*
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* Initialize a restart context
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*/
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void mbedtls_pk_restart_init( mbedtls_pk_restart_ctx *ctx )
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{
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PK_VALIDATE( ctx != NULL );
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ctx->pk_info = NULL;
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ctx->rs_ctx = NULL;
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}
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/*
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* Free the components of a restart context
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*/
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void mbedtls_pk_restart_free( mbedtls_pk_restart_ctx *ctx )
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{
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if( ctx == NULL || ctx->pk_info == NULL ||
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ctx->pk_info->rs_free_func == NULL )
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{
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return;
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}
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ctx->pk_info->rs_free_func( ctx->rs_ctx );
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ctx->pk_info = NULL;
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ctx->rs_ctx = NULL;
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}
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#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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/*
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* Get pk_info structure from type
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*/
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const mbedtls_pk_info_t * mbedtls_pk_info_from_type( mbedtls_pk_type_t pk_type )
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{
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switch( pk_type ) {
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#if defined(MBEDTLS_RSA_C)
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case MBEDTLS_PK_RSA:
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return( &mbedtls_rsa_info );
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#endif
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#if defined(MBEDTLS_ECP_C)
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case MBEDTLS_PK_ECKEY:
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return( &mbedtls_eckey_info );
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case MBEDTLS_PK_ECKEY_DH:
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return( &mbedtls_eckeydh_info );
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#endif
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#if defined(MBEDTLS_ECDSA_C)
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case MBEDTLS_PK_ECDSA:
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return( &mbedtls_ecdsa_info );
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#endif
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/* MBEDTLS_PK_RSA_ALT omitted on purpose */
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default:
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return( NULL );
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}
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}
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/*
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* Initialise context
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*/
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int mbedtls_pk_setup( mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info )
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{
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PK_VALIDATE_RET( ctx != NULL );
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if( info == NULL || ctx->pk_info != NULL )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
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return( MBEDTLS_ERR_PK_ALLOC_FAILED );
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ctx->pk_info = info;
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return( 0 );
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}
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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/*
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* Initialise a PSA-wrapping context
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*/
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int mbedtls_pk_setup_opaque( mbedtls_pk_context *ctx,
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const mbedtls_svc_key_id_t key )
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{
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const mbedtls_pk_info_t *info = NULL;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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mbedtls_svc_key_id_t *pk_ctx;
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psa_key_type_t type;
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if( ctx == NULL || ctx->pk_info != NULL )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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if( PSA_SUCCESS != psa_get_key_attributes( key, &attributes ) )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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type = psa_get_key_type( &attributes );
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psa_reset_key_attributes( &attributes );
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if( PSA_KEY_TYPE_IS_ECC_KEY_PAIR( type ) )
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info = &mbedtls_pk_ecdsa_opaque_info;
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else if( type == PSA_KEY_TYPE_RSA_KEY_PAIR )
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info = &mbedtls_pk_rsa_opaque_info;
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else
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return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
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return( MBEDTLS_ERR_PK_ALLOC_FAILED );
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ctx->pk_info = info;
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pk_ctx = (mbedtls_svc_key_id_t *) ctx->pk_ctx;
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*pk_ctx = key;
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return( 0 );
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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/*
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* Initialize an RSA-alt context
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*/
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int mbedtls_pk_setup_rsa_alt( mbedtls_pk_context *ctx, void * key,
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mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
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mbedtls_pk_rsa_alt_sign_func sign_func,
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mbedtls_pk_rsa_alt_key_len_func key_len_func )
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{
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mbedtls_rsa_alt_context *rsa_alt;
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const mbedtls_pk_info_t *info = &mbedtls_rsa_alt_info;
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PK_VALIDATE_RET( ctx != NULL );
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if( ctx->pk_info != NULL )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
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return( MBEDTLS_ERR_PK_ALLOC_FAILED );
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ctx->pk_info = info;
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rsa_alt = (mbedtls_rsa_alt_context *) ctx->pk_ctx;
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rsa_alt->key = key;
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rsa_alt->decrypt_func = decrypt_func;
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rsa_alt->sign_func = sign_func;
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rsa_alt->key_len_func = key_len_func;
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return( 0 );
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}
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#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
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/*
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* Tell if a PK can do the operations of the given type
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*/
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int mbedtls_pk_can_do( const mbedtls_pk_context *ctx, mbedtls_pk_type_t type )
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{
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/* A context with null pk_info is not set up yet and can't do anything.
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* For backward compatibility, also accept NULL instead of a context
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* pointer. */
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if( ctx == NULL || ctx->pk_info == NULL )
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return( 0 );
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return( ctx->pk_info->can_do( type ) );
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}
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/*
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* Helper for mbedtls_pk_sign and mbedtls_pk_verify
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*/
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static inline int pk_hashlen_helper( mbedtls_md_type_t md_alg, size_t *hash_len )
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{
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const mbedtls_md_info_t *md_info;
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if( *hash_len != 0 )
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return( 0 );
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if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL )
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return( -1 );
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*hash_len = mbedtls_md_get_size( md_info );
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return( 0 );
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}
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#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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/*
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* Helper to set up a restart context if needed
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*/
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static int pk_restart_setup( mbedtls_pk_restart_ctx *ctx,
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const mbedtls_pk_info_t *info )
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{
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/* Don't do anything if already set up or invalid */
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if( ctx == NULL || ctx->pk_info != NULL )
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return( 0 );
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/* Should never happen when we're called */
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if( info->rs_alloc_func == NULL || info->rs_free_func == NULL )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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if( ( ctx->rs_ctx = info->rs_alloc_func() ) == NULL )
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return( MBEDTLS_ERR_PK_ALLOC_FAILED );
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ctx->pk_info = info;
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return( 0 );
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}
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#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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/*
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* Verify a signature (restartable)
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*/
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int mbedtls_pk_verify_restartable( mbedtls_pk_context *ctx,
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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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mbedtls_pk_restart_ctx *rs_ctx )
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{
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PK_VALIDATE_RET( ctx != NULL );
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PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) ||
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hash != NULL );
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PK_VALIDATE_RET( sig != NULL );
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if( ctx->pk_info == NULL ||
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pk_hashlen_helper( md_alg, &hash_len ) != 0 )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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/* optimization: use non-restartable version if restart disabled */
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if( rs_ctx != NULL &&
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mbedtls_ecp_restart_is_enabled() &&
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ctx->pk_info->verify_rs_func != NULL )
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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if( ( ret = pk_restart_setup( rs_ctx, ctx->pk_info ) ) != 0 )
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return( ret );
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ret = ctx->pk_info->verify_rs_func( ctx->pk_ctx,
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md_alg, hash, hash_len, sig, sig_len, rs_ctx->rs_ctx );
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if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
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mbedtls_pk_restart_free( rs_ctx );
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return( ret );
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}
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#else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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(void) rs_ctx;
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#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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if( ctx->pk_info->verify_func == NULL )
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return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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return( ctx->pk_info->verify_func( ctx->pk_ctx, md_alg, hash, hash_len,
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sig, sig_len ) );
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}
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/*
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* Verify a signature
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*/
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int mbedtls_pk_verify( mbedtls_pk_context *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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return( mbedtls_pk_verify_restartable( ctx, md_alg, hash, hash_len,
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sig, sig_len, NULL ) );
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}
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/*
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* Verify a signature with options
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*/
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int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
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mbedtls_pk_context *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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PK_VALIDATE_RET( ctx != NULL );
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PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) ||
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hash != NULL );
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PK_VALIDATE_RET( sig != NULL );
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if( ctx->pk_info == NULL )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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if( ! mbedtls_pk_can_do( ctx, type ) )
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return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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if( type != MBEDTLS_PK_RSASSA_PSS )
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{
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/* General case: no options */
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if( options != NULL )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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return( mbedtls_pk_verify( ctx, md_alg, hash, hash_len, sig, sig_len ) );
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}
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#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21)
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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const mbedtls_pk_rsassa_pss_options *pss_opts;
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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( options == NULL )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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pss_opts = (const mbedtls_pk_rsassa_pss_options *) options;
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if( pss_opts->mgf1_hash_id == md_alg &&
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( (size_t) pss_opts->expected_salt_len == hash_len ||
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pss_opts->expected_salt_len == MBEDTLS_RSA_SALT_LEN_ANY ) )
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{
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/* see RSA_PUB_DER_MAX_BYTES in pkwrite.c */
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unsigned char buf[ 38 + 2 * MBEDTLS_MPI_MAX_SIZE ];
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unsigned char *p;
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int key_len;
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size_t signature_length;
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psa_status_t status = PSA_ERROR_DATA_CORRUPT;
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psa_status_t destruction_status = PSA_ERROR_DATA_CORRUPT;
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psa_algorithm_t psa_md_alg = mbedtls_psa_translate_md( md_alg );
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mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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psa_algorithm_t psa_sig_alg =
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( pss_opts->expected_salt_len == MBEDTLS_RSA_SALT_LEN_ANY ?
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PSA_ALG_RSA_PSS_ANY_SALT(psa_md_alg) :
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PSA_ALG_RSA_PSS(psa_md_alg) );
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p = buf + sizeof( buf );
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key_len = mbedtls_pk_write_pubkey( &p, buf, ctx );
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if( key_len < 0 )
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return( key_len );
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psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_PUBLIC_KEY );
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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_sig_alg );
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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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psa_destroy_key( key_id );
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return( mbedtls_pk_error_from_psa( status ) );
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}
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/* This function requires returning MBEDTLS_ERR_PK_SIG_LEN_MISMATCH
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* on a valid signature with trailing data in a buffer, but
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* mbedtls_psa_rsa_verify_hash requires the sig_len to be exact,
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* so for this reason the passed sig_len is overwritten. Smaller
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* signature lengths should not be accepted for verification. */
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signature_length = sig_len > mbedtls_pk_get_len( ctx ) ?
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mbedtls_pk_get_len( ctx ) : sig_len;
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status = psa_verify_hash( key_id, psa_sig_alg, hash,
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hash_len, sig, signature_length );
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destruction_status = psa_destroy_key( key_id );
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if( status == PSA_SUCCESS && sig_len > mbedtls_pk_get_len( ctx ) )
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return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
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if( status == PSA_SUCCESS )
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status = destruction_status;
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return( mbedtls_pk_error_from_psa_rsa( status ) );
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}
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else
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#endif
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{
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if( sig_len < mbedtls_pk_get_len( ctx ) )
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return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
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ret = mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_pk_rsa( *ctx ),
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md_alg, (unsigned int) hash_len, hash,
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pss_opts->mgf1_hash_id,
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pss_opts->expected_salt_len,
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sig );
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if( ret != 0 )
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return( ret );
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if( sig_len > mbedtls_pk_get_len( ctx ) )
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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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#else
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return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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#endif /* MBEDTLS_RSA_C && MBEDTLS_PKCS1_V21 */
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}
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/*
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* Make a signature (restartable)
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*/
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int mbedtls_pk_sign_restartable( mbedtls_pk_context *ctx,
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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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mbedtls_pk_restart_ctx *rs_ctx )
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{
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PK_VALIDATE_RET( ctx != NULL );
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PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) ||
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hash != NULL );
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PK_VALIDATE_RET( sig != NULL );
|
|
|
|
if( ctx->pk_info == NULL ||
|
|
pk_hashlen_helper( md_alg, &hash_len ) != 0 )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
|
|
/* optimization: use non-restartable version if restart disabled */
|
|
if( rs_ctx != NULL &&
|
|
mbedtls_ecp_restart_is_enabled() &&
|
|
ctx->pk_info->sign_rs_func != NULL )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( ( ret = pk_restart_setup( rs_ctx, ctx->pk_info ) ) != 0 )
|
|
return( ret );
|
|
|
|
ret = ctx->pk_info->sign_rs_func( ctx->pk_ctx, md_alg,
|
|
hash, hash_len,
|
|
sig, sig_size, sig_len,
|
|
f_rng, p_rng, rs_ctx->rs_ctx );
|
|
|
|
if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
|
|
mbedtls_pk_restart_free( rs_ctx );
|
|
|
|
return( ret );
|
|
}
|
|
#else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
|
|
(void) rs_ctx;
|
|
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
|
|
|
|
if( ctx->pk_info->sign_func == NULL )
|
|
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
|
|
|
return( ctx->pk_info->sign_func( ctx->pk_ctx, md_alg,
|
|
hash, hash_len,
|
|
sig, sig_size, sig_len,
|
|
f_rng, p_rng ) );
|
|
}
|
|
|
|
/*
|
|
* Make a signature
|
|
*/
|
|
int mbedtls_pk_sign( mbedtls_pk_context *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_pk_sign_restartable( ctx, md_alg, hash, hash_len,
|
|
sig, sig_size, sig_len,
|
|
f_rng, p_rng, NULL ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_C)
|
|
/*
|
|
* Make a signature given a signature type.
|
|
*/
|
|
int mbedtls_pk_sign_ext( mbedtls_pk_type_t pk_type,
|
|
mbedtls_pk_context *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_RSA_C)
|
|
psa_algorithm_t psa_md_alg;
|
|
#endif /* MBEDTLS_RSA_C */
|
|
*sig_len = 0;
|
|
|
|
if( ctx->pk_info == NULL )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
if( ! mbedtls_pk_can_do( ctx, pk_type ) )
|
|
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
|
|
|
if( pk_type != MBEDTLS_PK_RSASSA_PSS )
|
|
{
|
|
return( mbedtls_pk_sign( ctx, md_alg, hash, hash_len,
|
|
sig, sig_size, sig_len, f_rng, p_rng ) );
|
|
}
|
|
#if defined(MBEDTLS_RSA_C)
|
|
psa_md_alg = mbedtls_psa_translate_md( md_alg );
|
|
if( psa_md_alg == 0 )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
return( mbedtls_pk_psa_rsa_sign_ext( PSA_ALG_RSA_PSS( psa_md_alg ),
|
|
ctx->pk_ctx, hash, hash_len,
|
|
sig, sig_size, sig_len ) );
|
|
#else /* MBEDTLS_RSA_C */
|
|
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
|
|
#endif /* !MBEDTLS_RSA_C */
|
|
|
|
}
|
|
#endif /* MBEDTLS_PSA_CRYPTO_C */
|
|
|
|
/*
|
|
* Decrypt message
|
|
*/
|
|
int mbedtls_pk_decrypt( mbedtls_pk_context *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 )
|
|
{
|
|
PK_VALIDATE_RET( ctx != NULL );
|
|
PK_VALIDATE_RET( input != NULL || ilen == 0 );
|
|
PK_VALIDATE_RET( output != NULL || osize == 0 );
|
|
PK_VALIDATE_RET( olen != NULL );
|
|
|
|
if( ctx->pk_info == NULL )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
if( ctx->pk_info->decrypt_func == NULL )
|
|
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
|
|
|
return( ctx->pk_info->decrypt_func( ctx->pk_ctx, input, ilen,
|
|
output, olen, osize, f_rng, p_rng ) );
|
|
}
|
|
|
|
/*
|
|
* Encrypt message
|
|
*/
|
|
int mbedtls_pk_encrypt( mbedtls_pk_context *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 )
|
|
{
|
|
PK_VALIDATE_RET( ctx != NULL );
|
|
PK_VALIDATE_RET( input != NULL || ilen == 0 );
|
|
PK_VALIDATE_RET( output != NULL || osize == 0 );
|
|
PK_VALIDATE_RET( olen != NULL );
|
|
|
|
if( ctx->pk_info == NULL )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
if( ctx->pk_info->encrypt_func == NULL )
|
|
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
|
|
|
return( ctx->pk_info->encrypt_func( ctx->pk_ctx, input, ilen,
|
|
output, olen, osize, f_rng, p_rng ) );
|
|
}
|
|
|
|
/*
|
|
* Check public-private key pair
|
|
*/
|
|
int mbedtls_pk_check_pair( const mbedtls_pk_context *pub,
|
|
const mbedtls_pk_context *prv,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng )
|
|
{
|
|
PK_VALIDATE_RET( pub != NULL );
|
|
PK_VALIDATE_RET( prv != NULL );
|
|
|
|
if( pub->pk_info == NULL ||
|
|
prv->pk_info == NULL )
|
|
{
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
}
|
|
|
|
if( f_rng == NULL )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
if( prv->pk_info->check_pair_func == NULL )
|
|
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
|
|
|
|
if( prv->pk_info->type == MBEDTLS_PK_RSA_ALT )
|
|
{
|
|
if( pub->pk_info->type != MBEDTLS_PK_RSA )
|
|
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
|
}
|
|
else
|
|
{
|
|
if( pub->pk_info != prv->pk_info )
|
|
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
|
}
|
|
|
|
return( prv->pk_info->check_pair_func( pub->pk_ctx, prv->pk_ctx, f_rng, p_rng ) );
|
|
}
|
|
|
|
/*
|
|
* Get key size in bits
|
|
*/
|
|
size_t mbedtls_pk_get_bitlen( const mbedtls_pk_context *ctx )
|
|
{
|
|
/* For backward compatibility, accept NULL or a context that
|
|
* isn't set up yet, and return a fake value that should be safe. */
|
|
if( ctx == NULL || ctx->pk_info == NULL )
|
|
return( 0 );
|
|
|
|
return( ctx->pk_info->get_bitlen( ctx->pk_ctx ) );
|
|
}
|
|
|
|
/*
|
|
* Export debug information
|
|
*/
|
|
int mbedtls_pk_debug( const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items )
|
|
{
|
|
PK_VALIDATE_RET( ctx != NULL );
|
|
if( ctx->pk_info == NULL )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
if( ctx->pk_info->debug_func == NULL )
|
|
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
|
|
|
ctx->pk_info->debug_func( ctx->pk_ctx, items );
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Access the PK type name
|
|
*/
|
|
const char *mbedtls_pk_get_name( const mbedtls_pk_context *ctx )
|
|
{
|
|
if( ctx == NULL || ctx->pk_info == NULL )
|
|
return( "invalid PK" );
|
|
|
|
return( ctx->pk_info->name );
|
|
}
|
|
|
|
/*
|
|
* Access the PK type
|
|
*/
|
|
mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx )
|
|
{
|
|
if( ctx == NULL || ctx->pk_info == NULL )
|
|
return( MBEDTLS_PK_NONE );
|
|
|
|
return( ctx->pk_info->type );
|
|
}
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
/*
|
|
* Load the key to a PSA key slot,
|
|
* then turn the PK context into a wrapper for that key slot.
|
|
*
|
|
* Currently only works for EC & RSA private keys.
|
|
*/
|
|
int mbedtls_pk_wrap_as_opaque( mbedtls_pk_context *pk,
|
|
mbedtls_svc_key_id_t *key,
|
|
psa_algorithm_t hash_alg )
|
|
{
|
|
#if !defined(MBEDTLS_ECP_C) && !defined(MBEDTLS_RSA_C)
|
|
((void) pk);
|
|
((void) key);
|
|
((void) hash_alg);
|
|
#else
|
|
#if defined(MBEDTLS_ECP_C)
|
|
if( mbedtls_pk_get_type( pk ) == MBEDTLS_PK_ECKEY )
|
|
{
|
|
const mbedtls_ecp_keypair *ec;
|
|
unsigned char d[MBEDTLS_ECP_MAX_BYTES];
|
|
size_t d_len;
|
|
psa_ecc_family_t curve_id;
|
|
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
psa_key_type_t key_type;
|
|
size_t bits;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
psa_status_t status;
|
|
|
|
/* export the private key material in the format PSA wants */
|
|
ec = mbedtls_pk_ec( *pk );
|
|
d_len = PSA_BITS_TO_BYTES( ec->grp.nbits );
|
|
if( ( ret = mbedtls_mpi_write_binary( &ec->d, d, d_len ) ) != 0 )
|
|
return( ret );
|
|
|
|
curve_id = mbedtls_ecc_group_to_psa( ec->grp.id, &bits );
|
|
key_type = PSA_KEY_TYPE_ECC_KEY_PAIR( curve_id );
|
|
|
|
/* prepare the key attributes */
|
|
psa_set_key_type( &attributes, key_type );
|
|
psa_set_key_bits( &attributes, bits );
|
|
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH |
|
|
PSA_KEY_USAGE_DERIVE);
|
|
psa_set_key_algorithm( &attributes, PSA_ALG_ECDSA( hash_alg ) );
|
|
psa_set_key_enrollment_algorithm( &attributes, PSA_ALG_ECDH );
|
|
|
|
/* import private key into PSA */
|
|
status = psa_import_key( &attributes, d, d_len, key );
|
|
if( status != PSA_SUCCESS )
|
|
return( mbedtls_pk_error_from_psa( status ) );
|
|
|
|
/* make PK context wrap the key slot */
|
|
mbedtls_pk_free( pk );
|
|
mbedtls_pk_init( pk );
|
|
|
|
return( mbedtls_pk_setup_opaque( pk, *key ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_ECP_C */
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if( mbedtls_pk_get_type( pk ) == MBEDTLS_PK_RSA )
|
|
{
|
|
unsigned char buf[MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES];
|
|
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
int key_len;
|
|
psa_status_t status;
|
|
|
|
/* export the private key material in the format PSA wants */
|
|
key_len = mbedtls_pk_write_key_der( pk, buf, sizeof( buf ) );
|
|
if( key_len <= 0 )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
/* prepare the key attributes */
|
|
psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_KEY_PAIR );
|
|
psa_set_key_bits( &attributes, mbedtls_pk_get_bitlen( pk ) );
|
|
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH );
|
|
psa_set_key_algorithm( &attributes,
|
|
PSA_ALG_RSA_PKCS1V15_SIGN( hash_alg ) );
|
|
|
|
/* import private key into PSA */
|
|
status = psa_import_key( &attributes,
|
|
buf + sizeof( buf ) - key_len,
|
|
key_len, key);
|
|
|
|
mbedtls_platform_zeroize( buf, sizeof( buf ) );
|
|
|
|
if( status != PSA_SUCCESS )
|
|
return( mbedtls_pk_error_from_psa( status ) );
|
|
|
|
/* make PK context wrap the key slot */
|
|
mbedtls_pk_free( pk );
|
|
mbedtls_pk_init( pk );
|
|
|
|
return( mbedtls_pk_setup_opaque( pk, *key ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_RSA_C */
|
|
#endif /* !MBEDTLS_ECP_C && !MBEDTLS_RSA_C */
|
|
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
|
|
}
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
#endif /* MBEDTLS_PK_C */
|