ASP.NET中DES加密与解密MD5加密帮助类的实现代码

public class TrialHelper
  {    //默认密钥向量
    private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
    /// 

    /// DES加密字符串
    /// 
    /// 待加密的字符串
    /// 加密密钥,要求为8位
    /// 加密成功返回加密后的字符串，失败返回源串
    public static string EncryptDES( string encryptString, string encryptKey = "" )
    {
      try
      {
 if (string.IsNullOrEmpty(encryptKey) || encryptKey.Length < 8)
 {
   encryptKey = "winform01";
 }
 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;
      }
    }
    /// 

    /// DES解密字符串
    /// 
    /// 待解密的字符串
    /// 解密密钥,要求为8位,和加密密钥相同
    /// 解密成功返回解密后的字符串，失败返源串
    public static string DecryptDES( string decryptString, string decryptKey = "" )
    {
      try
      {
 if (string.IsNullOrEmpty(decryptKey) || decryptKey.Length < 8)
 {
   decryptKey = "winform01";
 }
 byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 8));
 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;
      }
    }
    /// 

    /// MD5数据加密
    /// 
    /// 加密字段
    /// 加密后的字符串
    public static string GetMD5( string sDataIn )
    {
      System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
      byte[] bytValue, bytHash;
      bytValue = System.Text.Encoding.UTF8.GetBytes(sDataIn);
      bytHash = md5.ComputeHash(bytValue);
      md5.Clear();
      string sTemp = "";
      for (int i = 0; i < bytHash.Length; i++)
      {
 sTemp += bytHash[i].ToString("x").PadLeft(2, '0');
      }
      return sTemp;
    }
  }

    调用：              

//获取登录信息
 loginRecord.Name = tbName.Text.Trim();
 loginRecord.MD5Pwd = TrialHelper.GetMD5(tbPwd.Password); //保存到数据库MD5加密方式
 loginRecord.Pwd = TrialHelper.EncryptDES(tbPwd.Password);//记住密码des加密方式，保存到本地

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