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Provide no info from entropy_func() on future entropy

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This commit is contained in:
Paul Bakker 2014-03-26 12:51:25 +01:00
parent 66ff70dd48
commit b13d3ffb80
1 changed files with 9 additions and 9 deletions
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18
library/entropy.c
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@ -269,24 +269,19 @@ int entropy_func( void *data, unsigned char *output, size_t len )
#if defined(POLARSSL_ENTROPY_SHA512_ACCUMULATOR) #if defined(POLARSSL_ENTROPY_SHA512_ACCUMULATOR)
sha512_finish( &ctx->accumulator, buf ); sha512_finish( &ctx->accumulator, buf );
/*
* Perform second SHA-512 on entropy
*/
sha512( buf, ENTROPY_BLOCK_SIZE, buf, 0 );
/* /*
* Reset accumulator and counters and recycle existing entropy * Reset accumulator and counters and recycle existing entropy
*/ */
memset( &ctx->accumulator, 0, sizeof( sha512_context ) ); memset( &ctx->accumulator, 0, sizeof( sha512_context ) );
sha512_starts( &ctx->accumulator, 0 ); sha512_starts( &ctx->accumulator, 0 );
sha512_update( &ctx->accumulator, buf, ENTROPY_BLOCK_SIZE ); sha512_update( &ctx->accumulator, buf, ENTROPY_BLOCK_SIZE );
#else /* POLARSSL_ENTROPY_SHA512_ACCUMULATOR */
sha256_finish( &ctx->accumulator, buf );
/* /*
* Perform second SHA-256 on entropy * Perform second SHA-512 on entropy
*/ */
sha256( buf, ENTROPY_BLOCK_SIZE, buf, 0 ); sha512( buf, ENTROPY_BLOCK_SIZE, buf, 0 );
#else /* POLARSSL_ENTROPY_SHA512_ACCUMULATOR */
sha256_finish( &ctx->accumulator, buf );
/* /*
* Reset accumulator and counters and recycle existing entropy * Reset accumulator and counters and recycle existing entropy
@ -294,6 +289,11 @@ int entropy_func( void *data, unsigned char *output, size_t len )
memset( &ctx->accumulator, 0, sizeof( sha256_context ) ); memset( &ctx->accumulator, 0, sizeof( sha256_context ) );
sha256_starts( &ctx->accumulator, 0 ); sha256_starts( &ctx->accumulator, 0 );
sha256_update( &ctx->accumulator, buf, ENTROPY_BLOCK_SIZE ); sha256_update( &ctx->accumulator, buf, ENTROPY_BLOCK_SIZE );
/*
* Perform second SHA-256 on entropy
*/
sha256( buf, ENTROPY_BLOCK_SIZE, buf, 0 );
#endif /* POLARSSL_ENTROPY_SHA512_ACCUMULATOR */ #endif /* POLARSSL_ENTROPY_SHA512_ACCUMULATOR */
for( i = 0; i < ctx->source_count; i++ ) for( i = 0; i < ctx->source_count; i++ )