详解DES算法原理与实现(6)

/*设置本轮的左数据块*/
        memcpy(lblk, rblk, 4);
        /*设置本轮的右数据块*/
        memcpy(rblk, xblk, 4);
    }

/*将目标正文设置为重新连接的左右两个数据块*/
    memcpy(&target[0], rblk, 4);
    memcpy(&target[4], lblk, 4);

/*执行最终置换*/
    permute(target, DesFinal, 64);

return 0;
}

/*des_encipher DES加密数据*/
void des_encipher(const unsigned char *plaintext, unsigned char *ciphertext, const unsigned char *key)
{
    des_main(plaintext, ciphertext, key, encipher);
    return;
}

/*des_decipher DES解密数据*/
void des_decipher(const unsigned char *ciphertext, unsigned char *plaintext, const unsigned char *key)
{
    des_main(ciphertext, plaintext, key, decipher);
    return;
}

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