PHP

class JoDES {
  
    private static $_instance = NULL;
    /**
     * @return JoDES
     */
    public static function share() {
        if (is_null(self::$_instance)) {
            self::$_instance = new JoDES();
        }
        return self::$_instance;
    }
  
    /**
     * 加密
     * @param string $str 要處理的字符串
     * @param string $key 加密Key，為8個(gè)字節(jié)長度
     * @return string
     */
    public function encode($str, $key) {
        $size = mcrypt_get_block_size(MCRYPT_DES, MCRYPT_MODE_CBC);
        $str = $this->pkcs5Pad($str, $size);
        $aaa = mcrypt_cbc(MCRYPT_DES, $key, $str, MCRYPT_ENCRYPT, $key);
        $ret = base64_encode($aaa);
        return $ret;
    }
  
    /**
     * 解密
     * @param string $str 要處理的字符串
     * @param string $key 解密Key，為8個(gè)字節(jié)長度
     * @return string
     */
    public function decode($str, $key) {
        $strBin = base64_decode($str);
        $str = mcrypt_cbc(MCRYPT_DES, $key, $strBin, MCRYPT_DECRYPT, $key);
        $str = $this->pkcs5Unpad($str);
        return $str;
    }
  
    function hex2bin($hexData) {
        $binData = "";
        for ($i = 0; $i < strlen($hexData); $i += 2) {
            $binData .= chr(hexdec(substr($hexData, $i, 2)));
        }
        return $binData;
    }
  
    function pkcs5Pad($text, $blocksize) {
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text . str_repeat(chr($pad), $pad);
    }
  
    function pkcs5Unpad($text) {
        $pad = ord($text {strlen($text) - 1});
        if ($pad > strlen($text))
            return false;
  
        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad)
            return false;
  
        return substr($text, 0, - 1 * $pad);
    }
  
}

C#

public class MyDes
  {
        /// <summary>
        /// DES加密方法
        /// </summary>
        /// <param name="strPlain">明文</param>
        /// <param name="strDESKey">密鑰</param>
        /// <param name="strDESIV">向量</param>
        /// <returns>密文</returns>
        public static string Encode(string source, string _DESKey)
        {
            StringBuilder sb = new StringBuilder();
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                byte[] key = ASCIIEncoding.ASCII.GetBytes(_DESKey);
                byte[] iv = ASCIIEncoding.ASCII.GetBytes(_DESKey);
                byte[] dataByteArray = Encoding.UTF8.GetBytes(source);
                des.Mode = System.Security.Cryptography.CipherMode.CBC;
                des.Key = key;
                des.IV = iv;
                string encrypt = "";
                using (MemoryStream ms = new MemoryStream())
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(dataByteArray, 0, dataByteArray.Length);
                    cs.FlushFinalBlock();
                    encrypt = Convert.ToBase64String(ms.ToArray());
                }
                return encrypt;
            }
        }
 
        /// <summary>
        /// 進(jìn)行DES解密。
        /// </summary>
        /// <param name="pToDecrypt">要解密的base64串</param>
        /// <param name="sKey">密鑰，且必須為8位。</param>
        /// <returns>已解密的字符串。</returns>
        public static string Decode(string source, string sKey)
        {
            byte[] inputByteArray = System.Convert.FromBase64String(source);//Encoding.UTF8.GetBytes(source);
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Encoding.UTF8.GetString(ms.ToArray());
                ms.Close();
                return str;
            }
        }
    }