int ctr_drbg_init( ctr_drbg_context *ctx,
int (*f_entropy)(void *, unsigned char *, size_t),
void *p_entropy,
const unsigned char *custom,
size_t len )
{
return( ctr_drbg_init_entropy_len( ctx, f_entropy, p_entropy, custom, len,
CTR_DRBG_ENTROPY_LEN ) );
}
/*
* Checkup routine
*/
int ctr_drbg_self_test( int verbose )
{
ctr_drbg_context ctx;
unsigned char buf[16];
/*
* Based on a NIST CTR_DRBG test vector (PR = True)
*/
if( verbose != 0 )
polarssl_printf( " CTR_DRBG (PR = TRUE) : " );
test_offset = 0;
CHK( ctr_drbg_init_entropy_len( &ctx, ctr_drbg_self_test_entropy,
entropy_source_pr, nonce_pers_pr, 16, 32 ) );
ctr_drbg_set_prediction_resistance( &ctx, CTR_DRBG_PR_ON );
CHK( ctr_drbg_random( &ctx, buf, CTR_DRBG_BLOCKSIZE ) );
CHK( ctr_drbg_random( &ctx, buf, CTR_DRBG_BLOCKSIZE ) );
CHK( memcmp( buf, result_pr, CTR_DRBG_BLOCKSIZE ) );
if( verbose != 0 )
polarssl_printf( "passed\n" );
/*
* Based on a NIST CTR_DRBG test vector (PR = FALSE)
*/
if( verbose != 0 )
polarssl_printf( " CTR_DRBG (PR = FALSE): " );
test_offset = 0;
CHK( ctr_drbg_init_entropy_len( &ctx, ctr_drbg_self_test_entropy,
entropy_source_nopr, nonce_pers_nopr, 16, 32 ) );
CHK( ctr_drbg_random( &ctx, buf, 16 ) );
CHK( ctr_drbg_reseed( &ctx, NULL, 0 ) );
CHK( ctr_drbg_random( &ctx, buf, 16 ) );
CHK( memcmp( buf, result_nopr, 16 ) );
if( verbose != 0 )
polarssl_printf( "passed\n" );
if( verbose != 0 )
polarssl_printf( "\n" );
return( 0 );
}