DES加密

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

namespaceSHJ
{
/// <summary>
/// CDESEncrypt 的摘要说明。使用标准64位DES加密
/// </summary>
public class CDES
{
private byte[] FIV ;
private byte[] FKEY ;
public CDES()
{
// TODO: 在此处添加构造函数逻辑
this.DefaultInit();
}

/// <summary>
/// 默认键值和初始向量
/// </summary>
private void DefaultInit()
{
byte[] IV = { 155,103, 246, 8, 36, 99, 234, 36 };
byte[] key ={ 142, 16, 93, 156, 78, 4, 218, 132 };
FIV = IV;
FKEY = key;
}

/// <summary>
/// 采用标准 64位 DES 算法加密
/// </summary>
/// <param name="strText">要加密的字符串</param>
/// <returns>返回加密后的字符串</returns>
public string Encrypt(string strText)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms,des.CreateEncryptor(FKEY,FIV),CryptoStreamMode.Write);
StreamWriter sw = new StreamWriter(cs);
sw.Write(strText);
sw.Flush();
cs.FlushFinalBlock();
ms.Flush();
return Convert.ToBase64String(ms.GetBuffer(),0,Convert.ToInt32(ms.Length));
}


/// <summary>
/// 标准64位DES解密
/// </summary>
/// <param name="strText">要解密的字符串</param>
/// <returns>返回解密后的字符串</returns>
public string Decrypt(string strText)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Convert.FromBase64String(strText);
MemoryStream ms = new MemoryStream(inputByteArray);
CryptoStream cs = new CryptoStream(ms,des.CreateDecryptor(FKEY, FIV),CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cs);
return sr.ReadToEnd();
}

}
}