mirror of
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572 lines
16 KiB
C
Executable File
572 lines
16 KiB
C
Executable File
/*
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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 OR GPL-2.0-or-later
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*
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* This file is provided under the Apache License 2.0, or the
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* GNU General Public License v2.0 or later.
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*
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* **********
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* Apache License 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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* **********
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*
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* **********
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* GNU General Public License v2.0 or later:
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* **********
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PK_C)
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#include "mbedtls/pk.h"
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#include "mbedtls/pk_internal.h"
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#include "mbedtls/platform_util.h"
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#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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#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_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;
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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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#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21)
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int ret;
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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( 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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NULL, NULL, MBEDTLS_RSA_PUBLIC,
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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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#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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/* 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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/*
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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_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 );
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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->sign_rs_func != NULL )
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{
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int ret;
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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->sign_rs_func( ctx->pk_ctx, md_alg,
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hash, hash_len, sig, sig_len, f_rng, p_rng, 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->sign_func == NULL )
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return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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return( ctx->pk_info->sign_func( ctx->pk_ctx, md_alg, hash, hash_len,
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sig, sig_len, f_rng, p_rng ) );
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}
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/*
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* Make a signature
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*/
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int mbedtls_pk_sign( 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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unsigned char *sig, 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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return( mbedtls_pk_sign_restartable( ctx, md_alg, hash, hash_len,
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sig, sig_len, f_rng, p_rng, NULL ) );
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}
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/*
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* Decrypt message
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*/
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int mbedtls_pk_decrypt( mbedtls_pk_context *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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PK_VALIDATE_RET( ctx != NULL );
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PK_VALIDATE_RET( input != NULL || ilen == 0 );
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PK_VALIDATE_RET( output != NULL || osize == 0 );
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PK_VALIDATE_RET( olen != 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_info->decrypt_func == NULL )
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return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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return( ctx->pk_info->decrypt_func( ctx->pk_ctx, input, ilen,
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output, olen, osize, f_rng, p_rng ) );
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}
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/*
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* Encrypt message
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*/
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int mbedtls_pk_encrypt( mbedtls_pk_context *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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PK_VALIDATE_RET( ctx != NULL );
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PK_VALIDATE_RET( input != NULL || ilen == 0 );
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PK_VALIDATE_RET( output != NULL || osize == 0 );
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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 )
|
|
{
|
|
PK_VALIDATE_RET( pub != NULL );
|
|
PK_VALIDATE_RET( prv != NULL );
|
|
|
|
if( pub->pk_info == NULL ||
|
|
prv->pk_info == NULL ||
|
|
prv->pk_info->check_pair_func == NULL )
|
|
{
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
|
|
}
|
|
|
|
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 ) );
|
|
}
|
|
|
|
/*
|
|
* 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 );
|
|
}
|
|
|
|
#endif /* MBEDTLS_PK_C */
|