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- Changed entropy accumulator to have per-source thresholds

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This commit is contained in:
Paul Bakker 2011-12-10 17:02:19 +00:00
parent 5cb9db4c5b
commit bd4a9d0cda
3 changed files with 52 additions and 18 deletions
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22
include/polarssl/entropy.h
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@ -34,7 +34,6 @@
#define POLARSSL_ERR_ENTROPY_SOURCE_FAILED -0x003A /**< Critical entropy source failure. */
#define POLARSSL_ERR_ENTROPY_MAX_SOURCES -0x003C /**< No more sources can be added. */
#define ENTROPY_MIN_POOL 128 /**< Minimum amount of pool entropy needed for release */
#define ENTROPY_MAX_SOURCES 20 /**< Maximum number of sources supported */
#define ENTROPY_MAX_GATHER 128 /**< Maximum amount requested from entropy sources */
#define ENTROPY_BLOCK_SIZE 64 /**< Block size of entropy accumulator (SHA-512) */
@ -58,16 +57,26 @@ extern "C" {
*/
typedef int (*f_source_ptr)(void *, unsigned char *, size_t, size_t *);
/**
* \brief Entropy source state
*/
typedef struct
{
f_source_ptr f_source; /**< The entropy source callback */
void * p_source; /**< The callback data pointer */
size_t size; /**< Amount received */
size_t threshold; /**< Minimum level required before release */
}
source_state;
/**
* \brief Entropy context structure
*/
typedef struct
{
sha4_context accumulator;
size_t size;
int source_count;
f_source_ptr f_source[ENTROPY_MAX_SOURCES];
void * p_source[ENTROPY_MAX_SOURCES];
source_state source[ENTROPY_MAX_SOURCES];
}
entropy_context;
@ -84,11 +93,14 @@ void entropy_init( entropy_context *ctx );
* \param ctx Entropy context
* \param f_source Entropy function
* \param p_source Function data
* \param threshold Minimum required from source before entropy is released
* ( with entropy_func() )
*
* \return 0 is successful or POLARSSL_ERR_ENTROPY_MAX_SOURCES
*/
int entropy_add_source( entropy_context *ctx,
f_source_ptr f_source, void *p_source );
f_source_ptr f_source, void *p_source,
size_t threshold );
/**
* \brief Trigger an extra gather poll for the accumulator