eden-emu/mbedtls
15
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Implement hmac in the MD layer

Browse source
This commit is contained in:
Manuel Pégourié-Gonnard 2015-03-24 16:48:22 +01:00
parent 40fc4155d3
commit 8379a82a76
4 changed files with 65 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

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 );
}