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Implement hmac in the MD layer

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Manuel Pégourié-Gonnard 2015-03-24 16:48:22 +01:00
parent 40fc4155d3
commit 8379a82a76
4 changed files with 65 additions and 5 deletions
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4
include/mbedtls/md.h
View file

@ -78,6 +78,10 @@ typedef struct {
/** Digest-specific context */
void *md_ctx;
/** HMAC part of the context (WIP: fixed size) */
unsigned char ipad[128];
unsigned char opad[128];
} md_context_t;
#define MD_CONTEXT_T_INIT { \

3
include/mbedtls/md_wrap.h
View file

@ -54,6 +54,9 @@ struct _md_info_t {
/** Output length of the digest function */
int size;
/** Block length of the digest function */
int block_size;
/** Digest initialisation function */
void (*starts_func)( void *ctx );

54
library/md.c
View file

@ -269,10 +269,35 @@ 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];
size_t i;
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 );
if( keylen > (size_t) ctx->md_info->block_size )
{
ctx->md_info->starts_func( ctx->md_ctx );
ctx->md_info->update_func( ctx->md_ctx, key, keylen );
ctx->md_info->finish_func( ctx->md_ctx, sum );
keylen = ctx->md_info->size;
key = sum;
}
memset( ctx->ipad, 0x36, 128 );
memset( ctx->opad, 0x5C, 128 );
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] );
}
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 );
return( 0 );
}
@ -282,17 +307,23 @@ 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 );
ctx->md_info->update_func( ctx->md_ctx, input, ilen );
return( 0 );
}
int md_hmac_finish( md_context_t *ctx, unsigned char *output )
{
unsigned char tmp[POLARSSL_MD_MAX_SIZE];
if( ctx == NULL || ctx->md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
ctx->md_info->hmac_finish_func( ctx->md_ctx, output );
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, tmp, ctx->md_info->size );
ctx->md_info->finish_func( ctx->md_ctx, output );
return( 0 );
}
@ -302,7 +333,8 @@ 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 );
ctx->md_info->starts_func( ctx->md_ctx );
ctx->md_info->update_func( ctx->md_ctx, ctx->ipad, ctx->md_info->block_size );
return( 0 );
}
@ -311,10 +343,22 @@ 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 )
{
md_context_t ctx;
int ret;
if( md_info == NULL )
return( POLARSSL_ERR_MD_BAD_INPUT_DATA );
md_info->hmac_func( key, keylen, input, ilen, output );
md_init( &ctx );
if( ( ret = md_init_ctx( &ctx, md_info ) ) != 0 )
return( ret );
md_hmac_starts( &ctx, key, keylen );
md_hmac_update( &ctx, input, ilen );
md_hmac_finish( &ctx, output );
md_free( &ctx );
return( 0 );
}

9
library/md_wrap.c
View file

@ -148,6 +148,7 @@ const md_info_t md2_info = {
POLARSSL_MD_MD2,
"MD2",
16,
16,
md2_starts_wrap,
md2_update_wrap,
md2_finish_wrap,
@ -236,6 +237,7 @@ const md_info_t md4_info = {
POLARSSL_MD_MD4,
"MD4",
16,
64,
md4_starts_wrap,
md4_update_wrap,
md4_finish_wrap,
@ -324,6 +326,7 @@ const md_info_t md5_info = {
POLARSSL_MD_MD5,
"MD5",
16,
64,
md5_starts_wrap,
md5_update_wrap,
md5_finish_wrap,
@ -420,6 +423,7 @@ const md_info_t ripemd160_info = {
POLARSSL_MD_RIPEMD160,
"RIPEMD160",
20,
64,
ripemd160_starts_wrap,
ripemd160_update_wrap,
ripemd160_finish_wrap,
@ -516,6 +520,7 @@ const md_info_t sha1_info = {
POLARSSL_MD_SHA1,
"SHA1",
20,
64,
sha1_starts_wrap,
sha1_update_wrap,
sha1_finish_wrap,
@ -620,6 +625,7 @@ const md_info_t sha224_info = {
POLARSSL_MD_SHA224,
"SHA224",
28,
64,
sha224_starts_wrap,
sha224_update_wrap,
sha224_finish_wrap,
@ -725,6 +731,7 @@ const md_info_t sha256_info = {
POLARSSL_MD_SHA256,
"SHA256",
32,
64,
sha256_starts_wrap,
sha256_update_wrap,
sha256_finish_wrap,
@ -826,6 +833,7 @@ const md_info_t sha384_info = {
POLARSSL_MD_SHA384,
"SHA384",
48,
128,
sha384_starts_wrap,
sha384_update_wrap,
sha384_finish_wrap,
@ -931,6 +939,7 @@ const md_info_t sha512_info = {
POLARSSL_MD_SHA512,
"SHA512",
64,
128,
sha512_starts_wrap,
sha512_update_wrap,
sha512_finish_wrap,