c# DESEncrypt 加密、解密算法

 

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using System; using System.Security.Cryptography; using System.Text;   namespace AttendService {     public static class DESEncrypt     {         #region ========加密========           private static string txtKey = "PatrickpanP=";         private static string txtIV = "LiuJineagel=";            /// <summary>         /// 加密数据         /// </summary>         /// <param name="Text"></param>         /// <param name="sKey"></param>         /// <returns></returns>         public static string Encrypt(string Text)         {             DESCryptoServiceProvider des = new DESCryptoServiceProvider();             byte[] inputByteArray;             inputByteArray = Encoding.Default.GetBytes(Text);             //des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));             //des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));             des.Key = Convert.FromBase64String(txtKey);             des.IV = Convert.FromBase64String(txtIV);             System.IO.MemoryStream ms = new System.IO.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);             }             return ret.ToString();         }           #endregion           #region ========解密========             /// <summary>         /// 解密数据         /// </summary>         /// <param name="Text"></param>         /// <param name="sKey"></param>         /// <returns></returns>         public static string Decrypt(string Text)         {             DESCryptoServiceProvider des = new DESCryptoServiceProvider();             int len;             len = Text.Length / 2;             byte[] inputByteArray = new byte[len];             int x, i;             for (x = 0; x < len; x++)             {                 i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);                 inputByteArray[x] = (byte)i;             }             //des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));             //des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));             des.Key = Convert.FromBase64String(txtKey);             des.IV = Convert.FromBase64String(txtIV);             System.IO.MemoryStream ms = new System.IO.MemoryStream();             CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);             cs.Write(inputByteArray, 0, inputByteArray.Length);             cs.FlushFinalBlock();             return Encoding.Default.GetString(ms.ToArray());         }           #endregion     } }