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mbedtls/library/md.c

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8.1 KiB
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/**
* \file md.c
*
* \brief Generic message digest wrapper for mbed TLS
*
* \author Adriaan de Jong <dejong@fox-it.com>
*
* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://polarssl.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#if defined(POLARSSL_MD_C)
#include "polarssl/md.h"
#include "polarssl/md_wrap.h"
#include <stdlib.h>
#include <string.h>
#if defined(_MSC_VER) && !defined strcasecmp && !defined(EFIX64) && \
!defined(EFI32)
#define strcasecmp _stricmp
#endif
/* Implementation that should never be optimized out by the compiler */
static void polarssl_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
static const int supported_digests[] = {
#if defined(POLARSSL_SHA512_C)
POLARSSL_MD_SHA512,
POLARSSL_MD_SHA384,
#endif
#if defined(POLARSSL_SHA256_C)
POLARSSL_MD_SHA256,
POLARSSL_MD_SHA224,
#endif
#if defined(POLARSSL_SHA1_C)
POLARSSL_MD_SHA1,
#endif
#if defined(POLARSSL_RIPEMD160_C)
POLARSSL_MD_RIPEMD160,
#endif
#if defined(POLARSSL_MD5_C)
POLARSSL_MD_MD5,
#endif
#if defined(POLARSSL_MD4_C)
POLARSSL_MD_MD4,
#endif
#if defined(POLARSSL_MD2_C)
POLARSSL_MD_MD2,
#endif
POLARSSL_MD_NONE
};
const int *md_list( void )
{
return( supported_digests );
}
const md_info_t *md_info_from_string( const char *md_name )
{
if( NULL == md_name )
return( NULL );
/* Get the appropriate digest information */
#if defined(POLARSSL_MD2_C)
if( !strcasecmp( "MD2", md_name ) )
return md_info_from_type( POLARSSL_MD_MD2 );
#endif
#if defined(POLARSSL_MD4_C)
if( !strcasecmp( "MD4", md_name ) )
return md_info_from_type( POLARSSL_MD_MD4 );
#endif
#if defined(POLARSSL_MD5_C)
if( !strcasecmp( "MD5", md_name ) )
return md_info_from_type( POLARSSL_MD_MD5 );
#endif
#if defined(POLARSSL_RIPEMD160_C)
if( !strcasecmp( "RIPEMD160", md_name ) )
return md_info_from_type( POLARSSL_MD_RIPEMD160 );
#endif
#if defined(POLARSSL_SHA1_C)
if( !strcasecmp( "SHA1", md_name ) || !strcasecmp( "SHA", md_name ) )
return md_info_from_type( POLARSSL_MD_SHA1 );
#endif
#if defined(POLARSSL_SHA256_C)
if( !strcasecmp( "SHA224", md_name ) )
return md_info_from_type( POLARSSL_MD_SHA224 );
if( !strcasecmp( "SHA256", md_name ) )
return md_info_from_type( POLARSSL_MD_SHA256 );
#endif
#if defined(POLARSSL_SHA512_C)
if( !strcasecmp( "SHA384", md_name ) )
return md_info_from_type( POLARSSL_MD_SHA384 );
if( !strcasecmp( "SHA512", md_name ) )
return md_info_from_type( POLARSSL_MD_SHA512 );
#endif
return( NULL );
}
const md_info_t *md_info_from_type( md_type_t md_type )
{
switch( md_type )
{
#if defined(POLARSSL_MD2_C)
case POLARSSL_MD_MD2:
return( &md2_info );
#endif
#if defined(POLARSSL_MD4_C)
case POLARSSL_MD_MD4:
return( &md4_info );
#endif
#if defined(POLARSSL_MD5_C)
case POLARSSL_MD_MD5:
return( &md5_info );
#endif
#if defined(POLARSSL_RIPEMD160_C)
case POLARSSL_MD_RIPEMD160:
return( &ripemd160_info );
#endif
#if defined(POLARSSL_SHA1_C)
case POLARSSL_MD_SHA1:
return( &sha1_info );
#endif
#if defined(POLARSSL_SHA256_C)
case POLARSSL_MD_SHA224:
return( &sha224_info );
case POLARSSL_MD_SHA256:
return( &sha256_info );
#endif
#if defined(POLARSSL_SHA512_C)
case POLARSSL_MD_SHA384:
return( &sha384_info );
case POLARSSL_MD_SHA512:
return( &sha512_info );
#endif
default:
return( NULL );
}
}
void md_init( md_context_t *ctx )
{
memset( ctx, 0, sizeof( md_context_t ) );
}
void md_free( md_context_t *ctx )
{
if( ctx == NULL )
return;
if( ctx->md_ctx )
ctx->md_info->ctx_free_func( ctx->md_ctx );
polarssl_zeroize( ctx, sizeof( md_context_t ) );
}
int md_init_ctx( md_context_t *ctx, const md_info_t *md_info )
{
if( md_info == NULL || ctx == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
memset( ctx, 0, sizeof( md_context_t ) );
if( ( ctx->md_ctx = md_info->ctx_alloc_func() ) == NULL )
return( POLARSSL_ERR_MD_ALLOC_FAILED );
ctx->md_info = md_info;
md_info->starts_func( ctx->md_ctx );
return( 0 );
}
int md_free_ctx( md_context_t *ctx )
{
md_free( ctx );
return( 0 );
}
int md_starts( md_context_t *ctx )
{
if( ctx == NULL || ctx->md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->starts_func( ctx->md_ctx );
return( 0 );
}
int md_update( md_context_t *ctx, const unsigned char *input, size_t ilen )
{
if( ctx == NULL || ctx->md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->update_func( ctx->md_ctx, input, ilen );
return( 0 );
}
int md_finish( md_context_t *ctx, unsigned char *output )
{
if( ctx == NULL || ctx->md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->finish_func( ctx->md_ctx, output );
return( 0 );
}
int md( const md_info_t *md_info, const unsigned char *input, size_t ilen,
unsigned char *output )
{
if( md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
md_info->digest_func( input, ilen, output );
return( 0 );
}
int md_file( const md_info_t *md_info, const char *path, unsigned char *output )
{
#if defined(POLARSSL_FS_IO)
int ret;
#endif
if( md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
#if defined(POLARSSL_FS_IO)
ret = md_info->file_func( path, output );
if( ret != 0 )
return( POLARSSL_ERR_MD_FILE_IO_ERROR + ret );
return( ret );
#else
((void) path);
((void) output);
return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
#endif /* POLARSSL_FS_IO */
}
int md_hmac_starts( md_context_t *ctx, const unsigned char *key, size_t keylen )
{
if( ctx == NULL || ctx->md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->hmac_starts_func( ctx->md_ctx, key, keylen );
return( 0 );
}
int md_hmac_update( md_context_t *ctx, const unsigned char *input, size_t ilen )
{
if( ctx == NULL || ctx->md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->hmac_update_func( ctx->md_ctx, input, ilen );
return( 0 );
}
int md_hmac_finish( md_context_t *ctx, unsigned char *output )
{
if( ctx == NULL || ctx->md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->hmac_finish_func( ctx->md_ctx, output );
return( 0 );
}
int md_hmac_reset( md_context_t *ctx )
{
if( ctx == NULL || ctx->md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->hmac_reset_func( ctx->md_ctx );
return( 0 );
}
int md_hmac( const md_info_t *md_info, const unsigned char *key, size_t keylen,
const unsigned char *input, size_t ilen,
unsigned char *output )
{
if( md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
md_info->hmac_func( key, keylen, input, ilen, output );
return( 0 );
}
int md_process( md_context_t *ctx, const unsigned char *data )
{
if( ctx == NULL || ctx->md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->process_func( ctx->md_ctx, data );
return( 0 );
}
#endif /* POLARSSL_MD_C */
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