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Change entropy to use new MD API and check ret code

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This commit is contained in:
Andres Amaya Garcia 2017-06-29 13:28:13 +01:00
parent 8d08c4489e
commit 207cea57f9
1 changed files with 33 additions and 18 deletions
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51
library/entropy.c
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@ -75,9 +75,9 @@ void mbedtls_entropy_init( mbedtls_entropy_context *ctx )
#endif
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
mbedtls_sha512_starts( &ctx->accumulator, 0 );
mbedtls_sha512_starts_ext( &ctx->accumulator, 0 );
#else
mbedtls_sha256_starts( &ctx->accumulator, 0 );
mbedtls_sha256_starts_ext( &ctx->accumulator, 0 );
#endif
#if defined(MBEDTLS_HAVEGE_C)
mbedtls_havege_init( &ctx->havege_data );
@ -172,13 +172,16 @@ static int entropy_update( mbedtls_entropy_context *ctx, unsigned char source_id
unsigned char tmp[MBEDTLS_ENTROPY_BLOCK_SIZE];
size_t use_len = len;
const unsigned char *p = data;
int ret;
if( use_len > MBEDTLS_ENTROPY_BLOCK_SIZE )
{
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
mbedtls_sha512( data, len, tmp, 0 );
if( ( ret = mbedtls_sha512_ext( data, len, tmp, 0 ) ) != 0 )
return( ret );
#else
mbedtls_sha256( data, len, tmp, 0 );
if( ( ret = mbedtls_sha256_ext( data, len, tmp, 0 ) ) != 0 )
return( ret );
#endif
p = tmp;
use_len = MBEDTLS_ENTROPY_BLOCK_SIZE;
@ -188,14 +191,14 @@ static int entropy_update( mbedtls_entropy_context *ctx, unsigned char source_id
header[1] = use_len & 0xFF;
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
mbedtls_sha512_update( &ctx->accumulator, header, 2 );
mbedtls_sha512_update( &ctx->accumulator, p, use_len );
if( ( ret = mbedtls_sha512_update_ext( &ctx->accumulator, header, 2 ) ) != 0 )
return( ret );
return( mbedtls_sha512_update_ext( &ctx->accumulator, p, use_len ) );
#else
mbedtls_sha256_update( &ctx->accumulator, header, 2 );
mbedtls_sha256_update( &ctx->accumulator, p, use_len );
if( ( ret = mbedtls_sha256_update_ext( &ctx->accumulator, header, 2 ) ) != 0 )
return( ret );
return( mbedtls_sha256_update_ext( &ctx->accumulator, p, use_len ) );
#endif
return( 0 );
}
int mbedtls_entropy_update_manual( mbedtls_entropy_context *ctx,
@ -333,33 +336,45 @@ int mbedtls_entropy_func( void *data, unsigned char *output, size_t len )
memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
mbedtls_sha512_finish( &ctx->accumulator, buf );
if( ( ret = mbedtls_sha512_finish_ext( &ctx->accumulator, buf ) ) != 0 )
goto exit;
/*
* Reset accumulator and counters and recycle existing entropy
*/
memset( &ctx->accumulator, 0, sizeof( mbedtls_sha512_context ) );
mbedtls_sha512_starts( &ctx->accumulator, 0 );
mbedtls_sha512_update( &ctx->accumulator, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
if( ( ret = mbedtls_sha512_starts_ext( &ctx->accumulator, 0 ) ) != 0 )
goto exit;
if( ( ret = mbedtls_sha512_update_ext( &ctx->accumulator, buf,
MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
goto exit;
/*
* Perform second SHA-512 on entropy
*/
mbedtls_sha512( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, buf, 0 );
if( ( ret = mbedtls_sha512_ext( buf, MBEDTLS_ENTROPY_BLOCK_SIZE,
buf, 0 ) ) != 0 )
goto exit;
#else /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */
mbedtls_sha256_finish( &ctx->accumulator, buf );
if( ( ret = mbedtls_sha256_finish_ext( &ctx->accumulator, buf ) ) != 0 )
goto exit;
/*
* Reset accumulator and counters and recycle existing entropy
*/
memset( &ctx->accumulator, 0, sizeof( mbedtls_sha256_context ) );
mbedtls_sha256_starts( &ctx->accumulator, 0 );
mbedtls_sha256_update( &ctx->accumulator, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
if( ( ret = mbedtls_sha256_starts_ext( &ctx->accumulator, 0 ) ) != 0 )
goto exit;
if( ( ret = mbedtls_sha256_update_ext( &ctx->accumulator, buf,
MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
goto exit;
/*
* Perform second SHA-256 on entropy
*/
mbedtls_sha256( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, buf, 0 );
if( ( ret = mbedtls_sha256_ext( buf, MBEDTLS_ENTROPY_BLOCK_SIZE,
buf, 0 ) ) != 0 )
goto exit;
#endif /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */
for( i = 0; i < ctx->source_count; i++ )