526 lines
15 KiB
C
526 lines
15 KiB
C
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/*
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* Public Key abstraction layer: wrapper functions
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: GPL-2.0
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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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* This file is part of mbed TLS (https://tls.mbed.org)
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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_internal.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_ECDSA_C)
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#include "mbedtls/ecdsa.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_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_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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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;
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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, NULL, NULL,
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MBEDTLS_RSA_PUBLIC, md_alg,
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(unsigned int) hash_len, 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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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_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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return( mbedtls_rsa_pkcs1_sign( rsa, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
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md_alg, (unsigned int) hash_len, hash, sig ) );
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}
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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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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,
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MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
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}
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static int rsa_encrypt_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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*olen = mbedtls_rsa_get_len( rsa );
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if( *olen > osize )
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return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
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return( mbedtls_rsa_pkcs1_encrypt( rsa, f_rng, p_rng, MBEDTLS_RSA_PUBLIC,
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ilen, input, output ) );
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}
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static int rsa_check_pair_wrap( const void *pub, const void *prv )
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{
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return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub,
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(const mbedtls_rsa_context *) prv ) );
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}
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static void *rsa_alloc_wrap( void )
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{
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void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) );
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if( ctx != NULL )
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mbedtls_rsa_init( (mbedtls_rsa_context *) ctx, 0, 0 );
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return( ctx );
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}
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static void rsa_free_wrap( void *ctx )
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{
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mbedtls_rsa_free( (mbedtls_rsa_context *) ctx );
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mbedtls_free( ctx );
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}
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static void rsa_debug( const void *ctx, mbedtls_pk_debug_item *items )
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{
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items->type = MBEDTLS_PK_DEBUG_MPI;
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items->name = "rsa.N";
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items->value = &( ((mbedtls_rsa_context *) ctx)->N );
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items++;
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items->type = MBEDTLS_PK_DEBUG_MPI;
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items->name = "rsa.E";
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items->value = &( ((mbedtls_rsa_context *) ctx)->E );
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}
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const mbedtls_pk_info_t mbedtls_rsa_info = {
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MBEDTLS_PK_RSA,
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"RSA",
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rsa_get_bitlen,
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rsa_can_do,
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rsa_verify_wrap,
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rsa_sign_wrap,
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rsa_decrypt_wrap,
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rsa_encrypt_wrap,
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rsa_check_pair_wrap,
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rsa_alloc_wrap,
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rsa_free_wrap,
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rsa_debug,
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};
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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/*
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* Generic EC key
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*/
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static int eckey_can_do( mbedtls_pk_type_t type )
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{
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return( type == MBEDTLS_PK_ECKEY ||
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type == MBEDTLS_PK_ECKEY_DH ||
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type == MBEDTLS_PK_ECDSA );
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}
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static size_t eckey_get_bitlen( const void *ctx )
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{
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return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits );
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}
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#if defined(MBEDTLS_ECDSA_C)
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/* Forward declarations */
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static int ecdsa_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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static int ecdsa_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_len,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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static int eckey_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;
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mbedtls_ecdsa_context ecdsa;
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mbedtls_ecdsa_init( &ecdsa );
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if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
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ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );
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mbedtls_ecdsa_free( &ecdsa );
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return( ret );
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}
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static int eckey_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_len,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
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{
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int ret;
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mbedtls_ecdsa_context ecdsa;
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mbedtls_ecdsa_init( &ecdsa );
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if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
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ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,
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f_rng, p_rng );
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mbedtls_ecdsa_free( &ecdsa );
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return( ret );
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}
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#endif /* MBEDTLS_ECDSA_C */
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static int eckey_check_pair( const void *pub, const void *prv )
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{
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return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub,
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(const mbedtls_ecp_keypair *) prv ) );
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}
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static void *eckey_alloc_wrap( void )
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{
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void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
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if( ctx != NULL )
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mbedtls_ecp_keypair_init( ctx );
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return( ctx );
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}
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static void eckey_free_wrap( void *ctx )
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{
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mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx );
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mbedtls_free( ctx );
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}
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static void eckey_debug( const void *ctx, mbedtls_pk_debug_item *items )
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{
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items->type = MBEDTLS_PK_DEBUG_ECP;
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items->name = "eckey.Q";
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items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q );
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}
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const mbedtls_pk_info_t mbedtls_eckey_info = {
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MBEDTLS_PK_ECKEY,
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"EC",
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eckey_get_bitlen,
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eckey_can_do,
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#if defined(MBEDTLS_ECDSA_C)
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eckey_verify_wrap,
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eckey_sign_wrap,
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#else
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NULL,
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NULL,
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#endif
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NULL,
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NULL,
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eckey_check_pair,
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eckey_alloc_wrap,
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eckey_free_wrap,
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eckey_debug,
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};
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/*
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* EC key restricted to ECDH
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*/
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static int eckeydh_can_do( mbedtls_pk_type_t type )
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{
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return( type == MBEDTLS_PK_ECKEY ||
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type == MBEDTLS_PK_ECKEY_DH );
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}
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const mbedtls_pk_info_t mbedtls_eckeydh_info = {
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MBEDTLS_PK_ECKEY_DH,
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"EC_DH",
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eckey_get_bitlen, /* Same underlying key structure */
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eckeydh_can_do,
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NULL,
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NULL,
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NULL,
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NULL,
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eckey_check_pair,
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eckey_alloc_wrap, /* Same underlying key structure */
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eckey_free_wrap, /* Same underlying key structure */
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eckey_debug, /* Same underlying key structure */
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};
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#endif /* MBEDTLS_ECP_C */
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#if defined(MBEDTLS_ECDSA_C)
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static int ecdsa_can_do( mbedtls_pk_type_t type )
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{
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return( type == MBEDTLS_PK_ECDSA );
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}
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static int ecdsa_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;
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((void) md_alg);
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ret = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx,
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hash, hash_len, sig, sig_len );
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if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
|
||
|
|
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
|
||
|
|
|
||
|
|
return( ret );
|
||
|
|
}
|
||
|
|
|
||
|
|
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_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_len, f_rng, p_rng ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
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 );
|
||
|
|
}
|
||
|
|
|
||
|
|
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,
|
||
|
|
NULL,
|
||
|
|
NULL,
|
||
|
|
eckey_check_pair, /* Compatible key structures */
|
||
|
|
ecdsa_alloc_wrap,
|
||
|
|
ecdsa_free_wrap,
|
||
|
|
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_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 );
|
||
|
|
|
||
|
|
return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
|
||
|
|
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,
|
||
|
|
MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined(MBEDTLS_RSA_C)
|
||
|
|
static int rsa_alt_check_pair( const void *pub, const void *prv )
|
||
|
|
{
|
||
|
|
unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
|
||
|
|
unsigned char hash[32];
|
||
|
|
size_t sig_len = 0;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
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, &sig_len, NULL, NULL ) ) != 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,
|
||
|
|
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,
|
||
|
|
NULL,
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
|
||
|
|
|
||
|
|
#endif /* MBEDTLS_PK_C */
|