/* * Checkup routine */ int mbedtls_ctr_drbg_self_test( int verbose ) { mbedtls_ctr_drbg_context ctx; unsigned char buf[16]; mbedtls_ctr_drbg_init( &ctx ); /* * Based on a NIST CTR_DRBG test vector (PR = True) */ if( verbose != 0 ) mbedtls_printf( " CTR_DRBG (PR = TRUE) : " ); test_offset = 0; CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy, (void *) entropy_source_pr, nonce_pers_pr, 16, 32 ) ); mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON ); CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) ); CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) ); CHK( memcmp( buf, result_pr, MBEDTLS_CTR_DRBG_BLOCKSIZE ) ); mbedtls_ctr_drbg_free( &ctx ); if( verbose != 0 ) mbedtls_printf( "passed\n" ); /* * Based on a NIST CTR_DRBG test vector (PR = FALSE) */ if( verbose != 0 ) mbedtls_printf( " CTR_DRBG (PR = FALSE): " ); mbedtls_ctr_drbg_init( &ctx ); test_offset = 0; CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy, (void *) entropy_source_nopr, nonce_pers_nopr, 16, 32 ) ); CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) ); CHK( mbedtls_ctr_drbg_reseed( &ctx, NULL, 0 ) ); CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) ); CHK( memcmp( buf, result_nopr, 16 ) ); mbedtls_ctr_drbg_free( &ctx ); if( verbose != 0 ) mbedtls_printf( "passed\n" ); if( verbose != 0 ) mbedtls_printf( "\n" ); return( 0 ); }
int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context *ctx, int (*f_entropy)(void *, unsigned char *, size_t), void *p_entropy, const unsigned char *custom, size_t len ) { return( mbedtls_ctr_drbg_seed_entropy_len( ctx, f_entropy, p_entropy, custom, len, MBEDTLS_CTR_DRBG_ENTROPY_LEN ) ); }
void rand_bytes(byte* pb, size_t cb){ mbedtls_ctr_drbg_context ctx; // unsigned char buf[16]; mbedtls_ctr_drbg_init( &ctx ); mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy, (void *) entropy_source_pr, nonce_pers_pr, 16, 32 ); //mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON ); mbedtls_ctr_drbg_random( &ctx, pb, cb ); //mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ); //memcmp( buf, result_pr, MBEDTLS_CTR_DRBG_BLOCKSIZE ) ); mbedtls_ctr_drbg_free( &ctx ); }