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Add ctr_drbg_free()

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This commit is contained in:
Paul Bakker 2014-06-18 16:21:25 +02:00
parent 14e8be4d33
commit fff0366bba
2 changed files with 21 additions and 0 deletions
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7
include/polarssl/ctr_drbg.h
View file

@ -130,6 +130,13 @@ int ctr_drbg_init( ctr_drbg_context *ctx,
const unsigned char *custom, const unsigned char *custom,
size_t len ); size_t len );
/**
* \brief Clear CTR_CRBG context data
*
* \param ctx CTR_DRBG context to clear
*/
void ctr_drbg_free( ctr_drbg_context *ctx );
/** /**
* \brief Enable / disable prediction resistance (Default: Off) * \brief Enable / disable prediction resistance (Default: Off)
* *

14
library/ctr_drbg.c
View file

@ -48,6 +48,11 @@
#define polarssl_printf printf #define polarssl_printf printf
#endif #endif
/* Implementation that should never be optimized out by the compiler */
static void polarssl_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
/* /*
* Non-public function wrapped by ctr_crbg_init(). Necessary to allow NIST * Non-public function wrapped by ctr_crbg_init(). Necessary to allow NIST
* tests to succeed (which require known length fixed entropy) * tests to succeed (which require known length fixed entropy)
@ -95,6 +100,15 @@ int ctr_drbg_init( ctr_drbg_context *ctx,
CTR_DRBG_ENTROPY_LEN ) ); CTR_DRBG_ENTROPY_LEN ) );
} }
void ctr_drbg_free( ctr_drbg_context *ctx )
{
if( ctx == NULL )
return;
aes_free( &ctx->aes_ctx );
polarssl_zeroize( ctx, sizeof( ctr_drbg_context ) );
}
void ctr_drbg_set_prediction_resistance( ctr_drbg_context *ctx, int resistance ) void ctr_drbg_set_prediction_resistance( ctr_drbg_context *ctx, int resistance )
{ {
ctx->prediction_resistance = resistance; ctx->prediction_resistance = resistance;