java&c# dec 加密，通用

java 

/**
     * 解密DES
     * @param key 密钥，长度必须是8的倍数
     * @param data 数据源
     * @return 解密内容
     */
    public final static String decoderDES(String key,String data) throws Exception{
        // DES算法要求有一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
        // 从原始密匙数据创建一个DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key.getBytes("utf-8"));
        // 创建一个密匙工厂，然后用它把DESKeySpec对象转换成一个SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey securekey = keyFactory.generateSecret(dks);
        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance("DES");
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
        // 正式执行解密操作
        return new String(cipher.doFinal(hexStr2ByteArr(data)));
    }
    /**
     * 加密DES
     * @param key 加密key
     * @param data 加密内容
     * @return 加密串
     */
    public final static String encodeDES(String key,String data) throws Exception{
        // DES算法要求有一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
        // 从原始密匙数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key.getBytes("utf-8"));
        // 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey securekey = keyFactory.generateSecret(dks);
        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance("DES");
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
        // 执行加密操作
        byte[] buf = cipher.doFinal(data.getBytes("utf-8"));
        return byteArr2HexStr(buf);
    }

　　

Net

 public static string DES(string str)
        {

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(str);

            //建立加密对象的密钥和偏移量    
            //原文使用ASCIIEncoding.ASCII方法的GetBytes方法    
            //使得输入密码必须输入英文文本  
            des.Mode = CipherMode.ECB;
            des.Key = ASCIIEncoding.UTF8.GetBytes(key);
            des.IV = ASCIIEncoding.UTF8.GetBytes(key);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString().ToLower();   


          
        }


        public static string DESDeCode(string pToDecrypt)
        {
            //    HttpContext.Current.Response.Write(pToDecrypt + "<br>" + sKey);   
            //    HttpContext.Current.Response.End();   
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            //des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
          //  des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

            des.Mode = CipherMode.ECB;
            des.Key = ASCIIEncoding.UTF8.GetBytes(key);
            des.IV = ASCIIEncoding.UTF8.GetBytes(key);

            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();

            // return HttpContext.Current.Server.UrlDecode(System.Text.Encoding.Default.GetString(ms.ToArray()));
            return System.Text.Encoding.UTF8.GetString(ms.ToArray());
        }