DES_FLAGS
IMPLEMENT_des_cipher(des, ecb, ECB, DES_FLAGS, 64, 64, 0, block);
IMPLEMENT_des_cipher(des, cbc, CBC, DES_FLAGS, 64, 64, 64, block);
IMPLEMENT_des_cipher(des, ofb64, OFB, DES_FLAGS, 64, 8, 64, stream);
IMPLEMENT_des_cipher(des, cfb64, CFB, DES_FLAGS, 64, 8, 64, stream);
IMPLEMENT_des_cipher(des, cfb1, CFB, DES_FLAGS, 64, 8, 64, stream);
IMPLEMENT_des_cipher(des, cfb8, CFB, DES_FLAGS, 64, 8, 64, stream);