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- Cleaned up and further documented CTR_DRBG code

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This commit is contained in:
Paul Bakker 2011-11-29 10:50:51 +00:00
parent a3d195c41f
commit 2bc7cf16fe
2 changed files with 54 additions and 47 deletions
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13
include/polarssl/ctr_drbg.h
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@ -35,11 +35,15 @@
#define POLARSSL_ERR_CTR_DRBG_REQUEST_TOO_BIG -0x0036 /**< Too many random requested in single call. */
#define POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG -0x0038 /**< Input too large (Entropy + additional). */
#define CTR_DRBG_SEEDLEN 48 /**< The seed length (counter + AES key) */
#define CTR_DRBG_BLOCKSIZE 16 /**< Block size used by the cipher */
#define CTR_DRBG_KEYSIZE 32 /**< Key size used by the cipher */
#define CTR_DRBG_KEYBITS ( CTR_DRBG_KEYSIZE * 8 )
#define CTR_DRBG_SEEDLEN ( CTR_DRBG_KEYSIZE + CTR_DRBG_BLOCKSIZE )
/**< The seed length (counter + AES key) */
#define CTR_DRBG_ENTROPY_LEN 32 /**< Amount of entropy used per seed by default */
#define CTR_DRBG_RESEED_INTERVAL 10000 /**< Interval before reseed is performed by default */
#define CTR_DRBG_MAX_INPUT 256 /**< Maximum number of additional input bytes */
#define CTR_DRBG_MAX_REQUEST 500 /**< Maximum number of requested bytes per call */
#define CTR_DRBG_MAX_REQUEST 1024 /**< Maximum number of requested bytes per call */
#define CTR_DRBG_MAX_SEED_INPUT 384 /**< Maximum size of (re)seed buffer */
#define CTR_DRBG_PR_OFF 0 /**< No prediction resistance */
@ -83,6 +87,7 @@ ctr_drbg_context;
* length)
* \param p_entropy Entropy context
* \param custom Personalization data (Device specific identifiers)
* (Can be NULL)
* \param len Length of personalization data
*
* \return 0 if successful, or
@ -130,7 +135,7 @@ void ctr_drbg_set_reseed_interval( ctr_drbg_context *ctx,
* \brief CTR_DRBG reseeding (extracts data from entropy source)
*
* \param ctx CTR_DRBG context
* \param additional Additional data to add to state
* \param additional Additional data to add to state (Can be NULL)
* \param len Length of additional data
*
* \return 0 if successful, or
@ -158,7 +163,7 @@ int ctr_drbg_update( ctr_drbg_context *ctx,
* \param p_rng CTR_DRBG context
* \param output Buffer to fill
* \param output_len Length of the buffer
* \param additional Additional data to update with
* \param additional Additional data to update with (Can be NULL)
* \param add_len Length of additional data
*
* \return 0 if successful, or