C#DES加密

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using System;

using  System.Collections.Generic; using  System.ComponentModel; using  System.Data; using  System.Text; using  System.Windows.Forms; using  System.Security.Cryptography; //加密部分 using  System.IO;   namespace  WindowsFormsApplication1 {      public  partial  class  Form1 : Form      {          public  Form1()          {              InitializeComponent();          }            private  static  byte [] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };          private  static  string  keyUse = "12345678" ;          private  static  string  keyDe = "12345678" ;          /// <summary>          /// DES加密字串          /// </summary>          /// <param name="encryptString">待加密的字串          /// <param name="encryptKey">加密金鑰,要求為8位          /// <returns>加密成功返回加密後的字串，失敗返回源串</returns>          public  static  string  EncryptDES( string  encryptString, string  encryptKey)          {              try              {                  byte [] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));                  byte [] rgbIV = Keys;                  byte [] inputByteArray = Encoding.UTF8.GetBytes(encryptString);                  DESCryptoServiceProvider dCSP = new  DESCryptoServiceProvider();                  MemoryStream mStream = new  MemoryStream();                  CryptoStream cStream = new  CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);                  cStream.Write(inputByteArray, 0, inputByteArray.Length);                  cStream.FlushFinalBlock();                  return  Convert.ToBase64String(mStream.ToArray());              }              catch              {                  return  encryptString;              }          }            /// <summary>          /// DES解密字串          /// </summary>          /// <param name="decryptString">待解密的字串          /// <param name="decryptKey">解密密鑰,要求為8位,和加密金鑰相同          /// <returns>解密成功返回解密後的字串，失敗返源串</returns>          public  static  string  DecryptDES( string  decryptString, string  decryptKey)          {              try              {                  byte [] rgbKey = Encoding.UTF8.GetBytes(decryptKey);                  byte [] rgbIV = Keys;                  byte [] inputByteArray = Convert.FromBase64String(decryptString);                  DESCryptoServiceProvider DCSP = new  DESCryptoServiceProvider();                  MemoryStream mStream = new  MemoryStream();                  CryptoStream cStream = new  CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);                  cStream.Write(inputByteArray, 0, inputByteArray.Length);                  cStream.FlushFinalBlock();                  return  Encoding.UTF8.GetString(mStream.ToArray());              }              catch              {                  return  decryptString;              }          }            private  void  button1_Click( object  sender, EventArgs e)          {              string  strOrg = TB_ORG.Text;              string  tmp = System.Text.Encoding.Default.GetString(Keys); //[].ToString();//BitConverter.ToString(Keys).Replace("-", string.Empty);// Keys.ToString();              string  strEp = EncryptDES(strOrg, keyUse);              TB_EP.Text = strEp;          }            private  void  button2_Click( object  sender, EventArgs e)          {              string  strEp = TB_EP.Text;              string  tmp = System.Text.Encoding.Default.GetString(Keys); //BitConverter.ToString(Keys).Replace("-", string.Empty);// Keys.ToString();              string  strDe = DecryptDES(strEp, keyDe);              TB_DE.Text = strDe;          }      } }

C#DES加密