一个简单实用的字符串加密解密类

using System;


using System.Security.Cryptography;


using System.IO;


using System.Text;




namespace SDSPNDSC.Common




...{




/**////


/// 通过DES对称加密算法,完成对字符串的加密和解密操作。


///


public class Encrypt




...{


private SymmetricAlgorithm mCSP;


private const string CIV ="kXwL7X2+fgM=";//密钥


private const string CKEY ="FwGQWRRgKCI=";//初始化向量




public Encrypt()




...{


mCSP = new DESCryptoServiceProvider();


}




public string EncryptString(string Value)




...{


ICryptoTransform ct;


MemoryStream ms;


CryptoStream cs;


byte[] byt;




ct = mCSP.CreateEncryptor(Convert.FromBase64String(CKEY), Convert.FromBase64String(CIV));




byt = Encoding.UTF8.GetBytes(Value);




ms = new MemoryStream();


cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);


cs.Write(byt, 0, byt.Length);


cs.FlushFinalBlock();




cs.Close();




return Convert.ToBase64String(ms.ToArray());


}




public string DecryptString(string Value)




...{


ICryptoTransform ct;


MemoryStream ms;


CryptoStream cs;


byte[] byt;




ct = mCSP.CreateDecryptor(Convert.FromBase64String(CKEY), Convert.FromBase64String(CIV));




byt = Convert.FromBase64String(Value);




ms = new MemoryStream();


cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);


cs.Write(byt, 0, byt.Length);


cs.FlushFinalBlock();




cs.Close();




return Encoding.UTF8.GetString(ms.ToArray());


}




}


}