C# DES加解密

        /// <summary>
        /// TripleDES 加密
        /// </summary>
        /// <param name="toEncrypt"></param>
        /// <param name="privateKey"></param>
        /// <returns></returns>
        public static string DesEncrypt(string toEncrypt, byte[] privateKey)
        {
            byte[] toEncryptArray = Encoding.UTF8.GetBytes(toEncrypt);

            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider
            {
                Key = privateKey,
                Mode = CipherMode.ECB,
                Padding = PaddingMode.PKCS7
            };

            ICryptoTransform cTransform = tdes.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            tdes.Clear();

            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

        /// <summary>
        /// TripleDES解密
        /// </summary>
        /// <param name="toDecrypt"></param>
        /// <param name="privateKey"></param>
        /// <returns></returns>
        public static string DesDecrypt(string toDecrypt, byte[] privateKey)
        {
            string res = "";
            try
            {
                //先base64解密 因为加密的时候最后走了一道base64加密
                byte[] enBytes = Convert.FromBase64String(toDecrypt);
                TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider
                {
                    Key = privateKey,
                    Mode = CipherMode.ECB,
                    Padding = PaddingMode.PKCS7
                };

                ICryptoTransform cTransform = tdes.CreateDecryptor();
                byte[] resultArray = cTransform.TransformFinalBlock(enBytes, 0, enBytes.Length);
                tdes.Clear();
                res = Encoding.UTF8.GetString(resultArray);
            }
            catch (Exception e)
            {
                Console.WriteLine("解密失败：" + e.Message);
            }
            return res;
        }


        /// <summary>
        /// 获取加密key的 md5 hash，最终DES加密的时候使用这个hash值
        /// </summary>
        /// <param name="key">原始key值</param>
        /// <returns></returns>
        public static byte[] GetKeyMd5Hash(string key)
        {
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            byte[] keyBytes = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
            hashmd5.Clear();

            return keyBytes;
        }

//加密

string res = DesEncrypt("明文", Tool.GetKeyMd5Hash("秘钥"));

//解密：

string res = DesDecrypt("密文", Tool.GetKeyMd5Hash("秘钥"));