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Make ipad/opad dynamic and more opaque

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This commit is contained in:
Manuel Pégourié-Gonnard 2015-03-25 11:49:07 +01:00
parent 80c988ba79
commit dfb3dc8b53
2 changed files with 46 additions and 16 deletions
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5
include/mbedtls/md.h
View file

@ -79,9 +79,8 @@ typedef struct {
/** Digest-specific context */
void *md_ctx;
/** HMAC part of the context (WIP: fixed size) */
unsigned char ipad[128];
unsigned char opad[128];
/** HMAC part of the context */
void *hmac_ctx;
} md_context_t;
#define MD_CONTEXT_T_INIT { \

57
library/md.c
View file

@ -35,7 +35,14 @@
#include "mbedtls/md.h"
#include "mbedtls/md_wrap.h"
#if defined(POLARSSL_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#define polarssl_malloc malloc
#define polarssl_free free
#endif
#include <string.h>
#if defined(_MSC_VER) && !defined strcasecmp && !defined(EFIX64) && \
@ -177,12 +184,18 @@ void md_init( md_context_t *ctx )
void md_free( md_context_t *ctx )
{
if( ctx == NULL )
if( ctx == NULL || ctx->md_info == NULL )
return;
if( ctx->md_ctx )
if( ctx->md_ctx != NULL )
ctx->md_info->ctx_free_func( ctx->md_ctx );
if( ctx->hmac_ctx != NULL )
{
polarssl_zeroize( ctx->hmac_ctx, 2 * ctx->md_info->block_size );
polarssl_free( ctx->hmac_ctx );
}
polarssl_zeroize( ctx, sizeof( md_context_t ) );
}
@ -196,6 +209,13 @@ int md_init_ctx( md_context_t *ctx, const md_info_t *md_info )
if( ( ctx->md_ctx = md_info->ctx_alloc_func() ) == NULL )
return( POLARSSL_ERR_MD_ALLOC_FAILED );
ctx->hmac_ctx = polarssl_malloc( 2 * md_info->block_size );
if( ctx->hmac_ctx == NULL )
{
md_info->ctx_free_func( ctx->md_ctx );
return( POLARSSL_ERR_MD_ALLOC_FAILED );
}
ctx->md_info = md_info;
md_info->starts_func( ctx->md_ctx );
@ -270,9 +290,10 @@ int md_file( const md_info_t *md_info, const char *path, unsigned char *output )
int md_hmac_starts( md_context_t *ctx, const unsigned char *key, size_t keylen )
{
unsigned char sum[POLARSSL_MD_MAX_SIZE];
unsigned char *ipad, *opad;
size_t i;
if( ctx == NULL || ctx->md_info == NULL )
if( ctx == NULL || ctx->md_info == NULL || ctx->hmac_ctx == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
if( keylen > (size_t) ctx->md_info->block_size )
@ -285,26 +306,29 @@ int md_hmac_starts( md_context_t *ctx, const unsigned char *key, size_t keylen )
key = sum;
}
memset( ctx->ipad, 0x36, 128 );
memset( ctx->opad, 0x5C, 128 );
ipad = (unsigned char *) ctx->hmac_ctx;
opad = (unsigned char *) ctx->hmac_ctx + ctx->md_info->block_size;
memset( ipad, 0x36, ctx->md_info->block_size );
memset( opad, 0x5C, ctx->md_info->block_size );
for( i = 0; i < keylen; i++ )
{
ctx->ipad[i] = (unsigned char)( ctx->ipad[i] ^ key[i] );
ctx->opad[i] = (unsigned char)( ctx->opad[i] ^ key[i] );
ipad[i] = (unsigned char)( ipad[i] ^ key[i] );
opad[i] = (unsigned char)( opad[i] ^ key[i] );
}
polarssl_zeroize( sum, sizeof( sum ) );
ctx->md_info->starts_func( ctx->md_ctx );
ctx->md_info->update_func( ctx->md_ctx, ctx->ipad, ctx->md_info->block_size );
ctx->md_info->update_func( ctx->md_ctx, ipad, ctx->md_info->block_size );
return( 0 );
}
int md_hmac_update( md_context_t *ctx, const unsigned char *input, size_t ilen )
{
if( ctx == NULL || ctx->md_info == NULL )
if( ctx == NULL || ctx->md_info == NULL || ctx->hmac_ctx == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->update_func( ctx->md_ctx, input, ilen );
@ -315,13 +339,16 @@ int md_hmac_update( md_context_t *ctx, const unsigned char *input, size_t ilen )
int md_hmac_finish( md_context_t *ctx, unsigned char *output )
{
unsigned char tmp[POLARSSL_MD_MAX_SIZE];
unsigned char *opad;
if( ctx == NULL || ctx->md_info == NULL )
if( ctx == NULL || ctx->md_info == NULL || ctx->hmac_ctx == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
opad = (unsigned char *) ctx->hmac_ctx + ctx->md_info->block_size;
ctx->md_info->finish_func( ctx->md_ctx, tmp );
ctx->md_info->starts_func( ctx->md_ctx );
ctx->md_info->update_func( ctx->md_ctx, ctx->opad, ctx->md_info->block_size );
ctx->md_info->update_func( ctx->md_ctx, opad, ctx->md_info->block_size );
ctx->md_info->update_func( ctx->md_ctx, tmp, ctx->md_info->size );
ctx->md_info->finish_func( ctx->md_ctx, output );
@ -330,11 +357,15 @@ int md_hmac_finish( md_context_t *ctx, unsigned char *output )
int md_hmac_reset( md_context_t *ctx )
{
if( ctx == NULL || ctx->md_info == NULL )
unsigned char *ipad;
if( ctx == NULL || ctx->md_info == NULL || ctx->hmac_ctx == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ipad = (unsigned char *) ctx->hmac_ctx;
ctx->md_info->starts_func( ctx->md_ctx );
ctx->md_info->update_func( ctx->md_ctx, ctx->ipad, ctx->md_info->block_size );
ctx->md_info->update_func( ctx->md_ctx, ipad, ctx->md_info->block_size );
return( 0 );
}