375 lines
9.6 KiB
C
375 lines
9.6 KiB
C
/*
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* Public Key abstraction layer
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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://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.h"
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#include "polarssl/pk_wrap.h"
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#if defined(POLARSSL_RSA_C)
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#include "polarssl/rsa.h"
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#endif
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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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/* 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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/*
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* Initialise a pk_context
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*/
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void pk_init( pk_context *ctx )
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{
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if( ctx == NULL )
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return;
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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 pk_context
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*/
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void pk_free( pk_context *ctx )
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{
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if( ctx == NULL || ctx->pk_info == NULL )
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return;
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ctx->pk_info->ctx_free_func( ctx->pk_ctx );
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polarssl_zeroize( ctx, sizeof( pk_context ) );
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}
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/*
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* Get pk_info structure from type
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*/
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const pk_info_t * pk_info_from_type( pk_type_t pk_type )
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{
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switch( pk_type ) {
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#if defined(POLARSSL_RSA_C)
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case POLARSSL_PK_RSA:
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return( &rsa_info );
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#endif
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#if defined(POLARSSL_ECP_C)
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case POLARSSL_PK_ECKEY:
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return( &eckey_info );
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case POLARSSL_PK_ECKEY_DH:
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return( &eckeydh_info );
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#endif
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#if defined(POLARSSL_ECDSA_C)
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case POLARSSL_PK_ECDSA:
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return( &ecdsa_info );
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#endif
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/* POLARSSL_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 pk_init_ctx( pk_context *ctx, const pk_info_t *info )
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{
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if( ctx == NULL || info == NULL || ctx->pk_info != NULL )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
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return( POLARSSL_ERR_PK_MALLOC_FAILED );
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ctx->pk_info = info;
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return( 0 );
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}
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/*
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* Initialize an RSA-alt context
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*/
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int pk_init_ctx_rsa_alt( pk_context *ctx, void * key,
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pk_rsa_alt_decrypt_func decrypt_func,
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pk_rsa_alt_sign_func sign_func,
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pk_rsa_alt_key_len_func key_len_func )
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{
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rsa_alt_context *rsa_alt;
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const pk_info_t *info = &rsa_alt_info;
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if( ctx == NULL || ctx->pk_info != NULL )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
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return( POLARSSL_ERR_PK_MALLOC_FAILED );
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ctx->pk_info = info;
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rsa_alt = (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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/*
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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 pk_can_do( pk_context *ctx, pk_type_t type )
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{
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/* null or NONE context can't do anything */
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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 pk_sign and pk_verify
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*/
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static inline int pk_hashlen_helper( md_type_t md_alg, size_t *hash_len )
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{
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const 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 = md_info_from_type( md_alg ) ) == NULL )
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return( -1 );
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*hash_len = md_info->size;
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return( 0 );
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}
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/*
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* Verify a signature
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*/
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int pk_verify( pk_context *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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if( ctx == NULL || ctx->pk_info == NULL ||
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pk_hashlen_helper( md_alg, &hash_len ) != 0 )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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if( ctx->pk_info->verify_func == NULL )
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return( POLARSSL_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 with options
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*/
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int pk_verify_ext( pk_type_t type, const void *options,
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pk_context *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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if( ctx == NULL || ctx->pk_info == NULL )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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if( ! pk_can_do( ctx, type ) )
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return( POLARSSL_ERR_PK_TYPE_MISMATCH );
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if( type == POLARSSL_PK_RSASSA_PSS )
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{
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#if defined(POLARSSL_RSA_C) && defined(POLARSSL_PKCS1_V21)
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int ret;
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const pk_rsassa_pss_options *pss_opts;
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if( options == NULL )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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pss_opts = (const pk_rsassa_pss_options *) options;
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if( sig_len < pk_get_len( ctx ) )
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return( POLARSSL_ERR_RSA_VERIFY_FAILED );
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ret = rsa_rsassa_pss_verify_ext( pk_rsa( *ctx ),
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NULL, NULL, 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 > pk_get_len( ctx ) )
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return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );
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return( 0 );
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#else
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return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
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#endif
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}
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/* General case: no options */
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if( options != NULL )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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return( 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
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*/
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int pk_sign( pk_context *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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if( ctx == NULL || ctx->pk_info == NULL ||
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pk_hashlen_helper( md_alg, &hash_len ) != 0 )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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if( ctx->pk_info->sign_func == NULL )
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return( POLARSSL_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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* Decrypt message
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*/
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int pk_decrypt( 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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if( ctx == NULL || ctx->pk_info == NULL )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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if( ctx->pk_info->decrypt_func == NULL )
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return( POLARSSL_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 pk_encrypt( 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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if( ctx == NULL || ctx->pk_info == NULL )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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if( ctx->pk_info->encrypt_func == NULL )
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return( POLARSSL_ERR_PK_TYPE_MISMATCH );
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return( ctx->pk_info->encrypt_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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* Check public-private key pair
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*/
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int pk_check_pair( const pk_context *pub, const pk_context *prv )
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{
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if( pub == NULL || pub->pk_info == NULL ||
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prv == NULL || prv->pk_info == NULL ||
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prv->pk_info->check_pair_func == NULL )
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{
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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}
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if( prv->pk_info->type == POLARSSL_PK_RSA_ALT )
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{
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if( pub->pk_info->type != POLARSSL_PK_RSA )
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return( POLARSSL_ERR_PK_TYPE_MISMATCH );
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}
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else
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{
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if( pub->pk_info != prv->pk_info )
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return( POLARSSL_ERR_PK_TYPE_MISMATCH );
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}
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return( prv->pk_info->check_pair_func( pub->pk_ctx, prv->pk_ctx ) );
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}
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/*
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* Get key size in bits
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*/
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size_t pk_get_size( const pk_context *ctx )
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{
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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->get_size( ctx->pk_ctx ) );
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}
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/*
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* Export debug information
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*/
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int pk_debug( const pk_context *ctx, pk_debug_item *items )
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{
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if( ctx == NULL || ctx->pk_info == NULL )
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return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
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if( ctx->pk_info->debug_func == NULL )
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return( POLARSSL_ERR_PK_TYPE_MISMATCH );
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ctx->pk_info->debug_func( ctx->pk_ctx, items );
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return( 0 );
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}
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/*
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* Access the PK type name
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*/
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const char * pk_get_name( const pk_context *ctx )
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{
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if( ctx == NULL || ctx->pk_info == NULL )
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return( "invalid PK" );
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return( ctx->pk_info->name );
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}
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/*
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* Access the PK type
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*/
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pk_type_t pk_get_type( const pk_context *ctx )
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{
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if( ctx == NULL || ctx->pk_info == NULL )
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return( POLARSSL_PK_NONE );
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return( ctx->pk_info->type );
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}
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#endif /* POLARSSL_PK_C */
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