用C#实现DES加密解密封装

using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;

namespace Common
... {
/**////<summary>
///DESEncrypt加密解密算法。
///</summary>
publicsealedclassDESEncrypt
...{
privateDESEncrypt()
...{
//
//TODO:在此处添加构造函数逻辑
//
}

privatestaticstringkey="zhoufoxcn";

/**////<summary>
///对称加密解密的密钥
///</summary>
publicstaticstringKey
...{
get
...{
returnkey;
}
set
...{
key=value;
}
}

/**////<summary>
///DES加密
///</summary>
///<paramname="encryptString"></param>
///<returns></returns>
publicstaticstringDesEncrypt(stringencryptString)
...{
byte[]keyBytes=Encoding.UTF8.GetBytes(key.Substring(0,8));
byte[]keyIV=keyBytes;
byte[]inputByteArray=Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProviderprovider=newDESCryptoServiceProvider();
MemoryStreammStream=newMemoryStream();
CryptoStreamcStream=newCryptoStream(mStream,provider.CreateEncryptor(keyBytes,keyIV),CryptoStreamMode.Write);
cStream.Write(inputByteArray,0,inputByteArray.Length);
cStream.FlushFinalBlock();
returnConvert.ToBase64String(mStream.ToArray());
}

/**////<summary>
///DES解密
///</summary>
///<paramname="decryptString"></param>
///<returns></returns>
publicstaticstringDesDecrypt(stringdecryptString)
...{
byte[]keyBytes=Encoding.UTF8.GetBytes(key.Substring(0,8));
byte[]keyIV=keyBytes;
byte[]inputByteArray=Convert.FromBase64String(decryptString);
DESCryptoServiceProviderprovider=newDESCryptoServiceProvider();
MemoryStreammStream=newMemoryStream();
CryptoStreamcStream=newCryptoStream(mStream,provider.CreateDecryptor(keyBytes,keyIV),CryptoStreamMode.Write);
cStream.Write(inputByteArray,0,inputByteArray.Length);
cStream.FlushFinalBlock();
returnEncoding.UTF8.GetString(mStream.ToArray());
}
}
}