答案:using System;
using System.Security ;
using System.Security.Cryptography ;
using System.Diagnostics ;
using System.Web ;
using System.Text ;
namespace Bigeagle.Util
{
/// <summary>
/// 一个加密类
/// <br>Author: Bigeagle@163.net</br>
/// <br>Date: 2001/09/25</br>
/// <br>History: 2001/10/25 finished</br>
/// </summary>
/// <remarks>
/// 封装常用的加密算法
/// </remarks>
public class Cryptography
{
/// <summary>
/// md5加密指定字符串
/// </summary>
/// <param name="a_strValue">要加密的字符串</param>
/// <returns>加密后的字符串</returns>
public static string EncryptMD5String(string a_strValue)
{
#if DEBUG
Debug.Assert(a_strValue.Trim() != "" , "空字符串" , "空字符串不需要加密") ;
#endif//DEBUG
//转换成bytearray
Byte[] hba = ((HashAlgorithm) CryptoConfig.CreateFromName("MD5")).
ComputeHash(StringToByteArray(a_strValue));
return ByteArrayToString(hba) ;
}
/// <summary>
/// 判断两个加密字符串是否相同
/// </summary>
/// <param name="a_str1"></param>
/// <param name="a_str2"></param>
/// <returns>如果相同返回真</returns>
public static bool IsSame(string a_str1 , string a_str2)
{
Byte[] b1 = StringToByteArray(a_str1) ;
Byte[] b2 = StringToByteArray(a_str2) ;
if(b1.Length != b2.Length)
{
return false ;
}
for(int i = 0 ; i < b1.Length ; i ++)
{
if(b1[i] != b2[i])
{
return false ;
}
}
return true ;
}
/// <summary>
/// 转换string到Byte树组
/// </summary>
/// <param name="s">要转换的字符串</param>
/// <returns>转换的Byte数组</returns>
public static Byte[] StringToByteArray(String s)
{
/*
Char[] ca = s.ToCharArray();
Byte[] ba = new Byte[ca.Length];
for(int i=0; i<ba.Length; i++) ba[i] = (Byte)ca[i];
return ba;*/
return Encoding.UTF8.GetBytes(s) ;
}
/// <summary>
/// 转换Byte数组到字符串
/// </summary>
/// <param name="a_arrByte">Byte数组</param>
/// <returns>字符串</returns>
public static string ByteArrayToString(Byte[] a_arrByte)
{
/*
//char[] ca = new char[a_arrByte.Length] ;
for(int i = 0 ; i < a_arrByte.Length ; i ++)
{
result += (char)a_arrByte[i] ;
}*/
return Encoding.UTF8.GetString(a_arrByte) ;
}
/// <summary>
/// 3des加密字符串
/// </summary>
/// <param name="a_strString">要加密的字符串</param>
/// <param name="a_strKey">密钥</param>
/// <returns>加密后并经base64编码的字符串</returns>
/// <remarks>静态方法,采用默认ascii编码</remarks>
public static string Encrypt3DES(string a_strString, string a_strKey)
{
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