C# DES加密解密

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 /// <summary>        /// 使用配置中的KEY，進行DES加密。        /// </summary>        /// <param name="pToEncrypt">要加密的字串。</param>        /// <returns>以Base64格式返回的加密字串。</returns>        public static string Encrypt(string pToEncrypt)        {            return Encrypt(pToEncrypt, ConfigurationManager.AppSettings["DESKey"] ?? "88888888");        }        /// <summary>        /// 使用配置中的KEY，進行DES解密。        /// </summary>        /// <param name="pToDecrypt">要解密的以Base64</param>        /// <returns>已解密的字串。</returns>        public static string Decrypt(string pToDecrypt)        {            return Decrypt(pToDecrypt, ConfigurationManager.AppSettings["DESKey"] ?? "88888888");        }        /// <summary>        /// 進行DES加密。        /// </summary>        /// <param name="pToEncrypt">要加密的字串。</param>        /// <param name="sKey">密鑰，且必須為8位。</param>        /// <returns>以Base64格式返回的加密字串。</returns>        public static string Encrypt(string pToEncrypt, string sKey)        {            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())            {                byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);                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.CreateEncryptor(), CryptoStreamMode.Write))                {                    cs.Write(inputByteArray, 0, inputByteArray.Length);                    cs.FlushFinalBlock();                    cs.Close();                }                string str = Convert.ToBase64String(ms.ToArray());                ms.Close();                return str;            }        }        /**/        /// <summary>        /// 進行DES解密。        /// </summary>        /// <param name="pToDecrypt">要解密的以Base64</param>        /// <param name="sKey">密鑰，且必須為8位。</param>        /// <returns>已解密的字串。</returns>        public static string Decrypt(string pToDecrypt, string sKey)        {            byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);            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;            }        }    }