mirror of
https://github.com/yuzu-emu/mbedtls
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501 lines
13 KiB
C
501 lines
13 KiB
C
/*
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* Public Key abstraction layer: wrapper functions
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*
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* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://www.polarssl.org)
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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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#if !defined(POLARSSL_CONFIG_FILE)
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#include "polarssl/config.h"
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#else
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#include POLARSSL_CONFIG_FILE
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#endif
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#if defined(POLARSSL_PK_C)
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#include "polarssl/pk_wrap.h"
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/* Even if RSA not activated, for the sake of RSA-alt */
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#include "polarssl/rsa.h"
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#if defined(POLARSSL_ECP_C)
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#include "polarssl/ecp.h"
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#endif
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#if defined(POLARSSL_ECDSA_C)
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#include "polarssl/ecdsa.h"
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#endif
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#if defined(POLARSSL_PLATFORM_C)
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#include "polarssl/platform.h"
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#else
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#include <stdlib.h>
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#define polarssl_malloc malloc
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#define polarssl_free free
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#endif
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/* Implementation that should never be optimized out by the compiler */
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static void polarssl_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = v; while( n-- ) *p++ = 0;
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}
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#if defined(POLARSSL_RSA_C)
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static int rsa_can_do( pk_type_t type )
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{
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return( type == POLARSSL_PK_RSA ||
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type == POLARSSL_PK_RSASSA_PSS );
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}
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static size_t rsa_get_size( const void *ctx )
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{
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return( 8 * ((const rsa_context *) ctx)->len );
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}
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static int rsa_verify_wrap( void *ctx, 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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if( sig_len < ((rsa_context *) ctx)->len )
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return( POLARSSL_ERR_RSA_VERIFY_FAILED );
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if( ( ret = rsa_pkcs1_verify( (rsa_context *) ctx, NULL, NULL,
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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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if( sig_len > ((rsa_context *) ctx)->len )
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return( POLARSSL_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, 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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*sig_len = ((rsa_context *) ctx)->len;
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return( rsa_pkcs1_sign( (rsa_context *) ctx, f_rng, p_rng, 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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if( ilen != ((rsa_context *) ctx)->len )
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return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
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return( rsa_pkcs1_decrypt( (rsa_context *) ctx, f_rng, p_rng,
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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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*olen = ((rsa_context *) ctx)->len;
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if( *olen > osize )
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return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
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return( rsa_pkcs1_encrypt( (rsa_context *) ctx,
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f_rng, p_rng, RSA_PUBLIC, 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( rsa_check_pub_priv( (const rsa_context *) pub,
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(const 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 = polarssl_malloc( sizeof( rsa_context ) );
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if( ctx != NULL )
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rsa_init( (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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rsa_free( (rsa_context *) ctx );
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polarssl_free( ctx );
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}
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static void rsa_debug( const void *ctx, pk_debug_item *items )
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{
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items->type = POLARSSL_PK_DEBUG_MPI;
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items->name = "rsa.N";
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items->value = &( ((rsa_context *) ctx)->N );
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items++;
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items->type = POLARSSL_PK_DEBUG_MPI;
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items->name = "rsa.E";
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items->value = &( ((rsa_context *) ctx)->E );
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}
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const pk_info_t rsa_info = {
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POLARSSL_PK_RSA,
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"RSA",
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rsa_get_size,
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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 /* POLARSSL_RSA_C */
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#if defined(POLARSSL_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( pk_type_t type )
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{
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return( type == POLARSSL_PK_ECKEY ||
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type == POLARSSL_PK_ECKEY_DH ||
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type == POLARSSL_PK_ECDSA );
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}
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static size_t eckey_get_size( const void *ctx )
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{
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return( ((ecp_keypair *) ctx)->grp.pbits );
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}
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#if defined(POLARSSL_ECDSA_C)
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/* Forward declarations */
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static int ecdsa_verify_wrap( void *ctx, 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, 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, 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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ecdsa_context ecdsa;
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ecdsa_init( &ecdsa );
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if( ( ret = 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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ecdsa_free( &ecdsa );
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return( ret );
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}
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static int eckey_sign_wrap( void *ctx, 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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ecdsa_context ecdsa;
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ecdsa_init( &ecdsa );
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if( ( ret = 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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ecdsa_free( &ecdsa );
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return( ret );
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}
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#endif /* POLARSSL_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( ecp_check_pub_priv( (const ecp_keypair *) pub,
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(const 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 = polarssl_malloc( sizeof( ecp_keypair ) );
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if( ctx != NULL )
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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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ecp_keypair_free( (ecp_keypair *) ctx );
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polarssl_free( ctx );
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}
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static void eckey_debug( const void *ctx, pk_debug_item *items )
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{
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items->type = POLARSSL_PK_DEBUG_ECP;
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items->name = "eckey.Q";
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items->value = &( ((ecp_keypair *) ctx)->Q );
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}
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const pk_info_t eckey_info = {
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POLARSSL_PK_ECKEY,
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"EC",
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eckey_get_size,
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eckey_can_do,
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#if defined(POLARSSL_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( pk_type_t type )
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{
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return( type == POLARSSL_PK_ECKEY ||
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type == POLARSSL_PK_ECKEY_DH );
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}
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const pk_info_t eckeydh_info = {
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POLARSSL_PK_ECKEY_DH,
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"EC_DH",
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eckey_get_size, /* 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 /* POLARSSL_ECP_C */
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#if defined(POLARSSL_ECDSA_C)
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static int ecdsa_can_do( pk_type_t type )
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{
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return( type == POLARSSL_PK_ECDSA );
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}
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static int ecdsa_verify_wrap( void *ctx, 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 = ecdsa_read_signature( (ecdsa_context *) ctx,
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hash, hash_len, sig, sig_len );
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if( ret == POLARSSL_ERR_ECP_SIG_LEN_MISMATCH )
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return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );
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return( ret );
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}
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static int ecdsa_sign_wrap( void *ctx, 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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/* Use deterministic ECDSA by default if available */
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#if defined(POLARSSL_ECDSA_DETERMINISTIC)
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((void) f_rng);
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((void) p_rng);
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return( ecdsa_write_signature_det( (ecdsa_context *) ctx,
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hash, hash_len, sig, sig_len, md_alg ) );
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#else
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((void) md_alg);
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return( ecdsa_write_signature( (ecdsa_context *) ctx,
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hash, hash_len, sig, sig_len, f_rng, p_rng ) );
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#endif /* POLARSSL_ECDSA_DETERMINISTIC */
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}
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static void *ecdsa_alloc_wrap( void )
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{
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void *ctx = polarssl_malloc( sizeof( ecdsa_context ) );
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if( ctx != NULL )
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ecdsa_init( (ecdsa_context *) ctx );
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return( ctx );
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}
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static void ecdsa_free_wrap( void *ctx )
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{
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ecdsa_free( (ecdsa_context *) ctx );
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polarssl_free( ctx );
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}
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const pk_info_t ecdsa_info = {
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POLARSSL_PK_ECDSA,
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"ECDSA",
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eckey_get_size, /* Compatible key structures */
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ecdsa_can_do,
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ecdsa_verify_wrap,
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ecdsa_sign_wrap,
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NULL,
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NULL,
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eckey_check_pair, /* Compatible key structures */
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ecdsa_alloc_wrap,
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ecdsa_free_wrap,
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eckey_debug, /* Compatible key structures */
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};
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#endif /* POLARSSL_ECDSA_C */
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/*
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* Support for alternative RSA-private implementations
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*/
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static int rsa_alt_can_do( pk_type_t type )
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{
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return( type == POLARSSL_PK_RSA );
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}
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static size_t rsa_alt_get_size( const void *ctx )
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{
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const rsa_alt_context *rsa_alt = (const rsa_alt_context *) ctx;
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return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
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}
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static int rsa_alt_sign_wrap( void *ctx, 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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rsa_alt_context *rsa_alt = (rsa_alt_context *) ctx;
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*sig_len = rsa_alt->key_len_func( rsa_alt->key );
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return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, 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_alt_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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rsa_alt_context *rsa_alt = (rsa_alt_context *) ctx;
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((void) f_rng);
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((void) p_rng);
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if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
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return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
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return( rsa_alt->decrypt_func( rsa_alt->key,
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RSA_PRIVATE, olen, input, output, osize ) );
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}
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#if defined(POLARSSL_RSA_C)
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static int rsa_alt_check_pair( const void *pub, const void *prv )
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{
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unsigned char sig[POLARSSL_MPI_MAX_SIZE];
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unsigned char hash[32];
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size_t sig_len = 0;
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int ret;
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if( rsa_alt_get_size( prv ) != rsa_get_size( pub ) )
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return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
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memset( hash, 0x2a, sizeof( hash ) );
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if( ( ret = rsa_alt_sign_wrap( (void *) prv, POLARSSL_MD_NONE,
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hash, sizeof( hash ),
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sig, &sig_len, NULL, NULL ) ) != 0 )
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{
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return( ret );
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}
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if( rsa_verify_wrap( (void *) pub, POLARSSL_MD_NONE,
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hash, sizeof( hash ), sig, sig_len ) != 0 )
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{
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return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
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}
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return( 0 );
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}
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#endif /* POLARSSL_RSA_C */
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static void *rsa_alt_alloc_wrap( void )
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{
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void *ctx = polarssl_malloc( sizeof( rsa_alt_context ) );
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if( ctx != NULL )
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memset( ctx, 0, sizeof( rsa_alt_context ) );
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return( ctx );
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}
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static void rsa_alt_free_wrap( void *ctx )
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{
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polarssl_zeroize( ctx, sizeof( rsa_alt_context ) );
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polarssl_free( ctx );
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}
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const pk_info_t rsa_alt_info = {
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POLARSSL_PK_RSA_ALT,
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"RSA-alt",
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rsa_alt_get_size,
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rsa_alt_can_do,
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NULL,
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rsa_alt_sign_wrap,
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rsa_alt_decrypt_wrap,
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NULL,
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#if defined(POLARSSL_RSA_C)
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rsa_alt_check_pair,
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#else
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NULL,
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#endif
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rsa_alt_alloc_wrap,
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rsa_alt_free_wrap,
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NULL,
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};
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#endif /* POLARSSL_PK_C */
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