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Entropy collector and CTR-DRBG now also work on SHA-256 if SHA-512 not available

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This commit is contained in:
Paul Bakker
2013-08-27 15:06:26 +02:00
parent 0a20171d52
commit fb08fd2e23
6 changed files with 65 additions and 5 deletions
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17
include/polarssl/entropy.h
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@ -31,7 +31,16 @@
#include "config.h"
#if defined(POLARSSL_SHA512_C)
#include "sha512.h"
#define POLARSSL_ENTROPY_SHA512_ACCUMULATOR
#else
#if defined(POLARSSL_SHA256_C)
#define POLARSSL_ENTROPY_SHA256_ACCUMULATOR
#include "sha256.h"
#endif
#endif
#if defined(POLARSSL_HAVEGE_C)
#include "havege.h"
#endif
@ -45,7 +54,11 @@
#define ENTROPY_MAX_GATHER 128 /**< Maximum amount requested from entropy sources */
#endif /* !POLARSSL_CONFIG_OPTIONS */
#if defined(POLARSSL_ENTROPY_SHA512_ACCUMULATOR)
#define ENTROPY_BLOCK_SIZE 64 /**< Block size of entropy accumulator (SHA-512) */
#else
#define ENTROPY_BLOCK_SIZE 32 /**< Block size of entropy accumulator (SHA-256) */
#endif
#define ENTROPY_SOURCE_MANUAL ENTROPY_MAX_SOURCES
@ -83,7 +96,11 @@ source_state;
*/
typedef struct
{
#if defined(POLARSSL_ENTROPY_SHA512_ACCUMULATOR)
sha512_context accumulator;
#else
sha256_context accumulator;
#endif
int source_count;
source_state source[ENTROPY_MAX_SOURCES];
#if defined(POLARSSL_HAVEGE_C)