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Add hmac_drbg_set_entropy_len()

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This commit is contained in:
Manuel Pégourié-Gonnard 2014-01-30 18:06:08 +01:00
parent 6801f39397
commit 4e669c614d
2 changed files with 19 additions and 1 deletions
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12
include/polarssl/hmac_drbg.h
View File

@ -96,7 +96,7 @@ int hmac_drbg_init( hmac_drbg_context *ctx,
size_t len ); size_t len );
/** /**
* \brief Simplified HMAC_DRBG initialisation. * \brief Initilisation of simpified HMAC_DRBG (never reseeds).
* (For use with deterministic ECDSA.) * (For use with deterministic ECDSA.)
* *
* \param ctx HMAC_DRBG context to be initialised * \param ctx HMAC_DRBG context to be initialised
@ -112,6 +112,16 @@ int hmac_drbg_init_buf( hmac_drbg_context *ctx,
const md_info_t * md_info, const md_info_t * md_info,
const unsigned char *data, size_t data_len ); const unsigned char *data, size_t data_len );
/**
* \brief Set the amount of entropy grabbed on each reseed
* (Default: HMAC_DRBG_ENTROPY_LEN)
*
* \param ctx HMAC_DRBG context
* \param len Amount of entropy to grab
*/
void hmac_drbg_set_entropy_len( hmac_drbg_context *ctx,
size_t len );
/** /**
* \brief HMAC_DRBG update state * \brief HMAC_DRBG update state
* *

8
library/hmac_drbg.c
View File

@ -156,6 +156,14 @@ int hmac_drbg_init( hmac_drbg_context *ctx,
return( 0 ); return( 0 );
} }
/*
* Set entropy length grabbed for reseeds
*/
void hmac_drbg_set_entropy_len( hmac_drbg_context *ctx, size_t len )
{
ctx->entropy_len = len;
}
/* /*
* HMAC_DRBG random function with optional additional data (10.1.2.5) * HMAC_DRBG random function with optional additional data (10.1.2.5)
*/ */