cfb_test
static int cfb_test(int bits, unsigned char *cfb_cipher);
err+=cfb_test(8,cfb_cipher8);
err+=cfb_test(16,cfb_cipher16);
err+=cfb_test(32,cfb_cipher32);
err+=cfb_test(48,cfb_cipher48);
err+=cfb_test(64,cfb_cipher64);