DES_ARG_INPLACE
DES_ARG_INPLACE(plaintext, ciphertext);
DES_ARG_INPLACE(ciphertext, plaintext);
DES_ARG_INPLACE(plaintext, ciphertext);
DES_ARG_INPLACE(ciphertext, plaintext);
DES_ARG_INPLACE(plaintext, ciphertext);
DES_ARG_INPLACE(ciphertext, plaintext);