/************************************************** 
* 版權(quán)所有: Mr_Sheng 
* 文 件 名: EncryptHelper.cs 
* 文件描述: 
* 類型說(shuō)明: EncryptHelper 加密幫助類 
* 授權(quán)聲明: 
* 本程序?yàn)樽杂绍浖?nbsp;
* 您可依據(jù)自由軟件基金會(huì)所發(fā)表的GPL v3授權(quán)條款，對(duì)本程序再次發(fā)布和/或修改； 
* 本程序是基于使用目的而加以發(fā)布，然而不負(fù)任何擔(dān)保責(zé)任； 
* 亦無(wú)對(duì)適售性或特定目的適用性所為的默示性擔(dān)保。 
* 詳情請(qǐng)參照GNU通用公共授權(quán) v3（參見(jiàn)license.txt文件）。 
* 版本歷史: 
* v2.0.0 Mr_Sheng 2009-09-09 修改 
* 
***************************************************/ 
using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Security.Cryptography; 

namespace Sheng.Common 
{ 
/// <summary> 
/// 加密幫助類 
/// </summary> 
public class EncryptHelper 
{ 
/// <summary> 
/// MD5加密 
/// </summary> 
/// <param name="str"></param> 
/// <returns></returns> 
public static string MD5DecryptString(string str) 
{ 
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); 
byte[] md5Source = System.Text.Encoding.UTF8.GetBytes(str); 
byte[] md5Out = md5.ComputeHash(md5Source); 
return Convert.ToBase64String(md5Out); 
} 

/// <summary> 
/// DES加密字符串 
/// </summary> 
/// <param name="sInputString">輸入字符</param> 
/// <param name="sKey">Key</param> 
/// <returns>加密結(jié)果</returns> 
public string DESEncryptString(string sInputString, string sKey) 
{ 
try 
{ 
byte[] data = Encoding.Default.GetBytes(sInputString); 
byte[] result; 
DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); 
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey); //密鑰 
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey); //初始化向量 
ICryptoTransform desencrypt = DES.CreateEncryptor(); //加密器對(duì)象 
result = desencrypt.TransformFinalBlock(data, 0, data.Length); //轉(zhuǎn)換指定字節(jié)數(shù)組的指定區(qū)域 
return BitConverter.ToString(result); 
} 
catch (Exception ex) 
{ 
//ex.Message = "DES加密異常"; 
throw ex; 
} 
} 

/// <summary> 
/// DES解密字符串 
/// </summary> 
/// <param name="sInputString">輸入字符</param> 
/// <param name="sKey">Key</param> 
/// <returns>解密結(jié)果</returns> 
public string DESDecryptString(string sInputString, string sKey) 
{ 
try 
{ 
//將字符串轉(zhuǎn)換為字節(jié)數(shù)組 
string[] sInput = sInputString.Split("-".ToCharArray()); 
byte[] data = new byte[sInput.Length]; 
byte[] result; 
for (int i = 0; i < sInput.Length; i++) 
{ 
data[i] = byte.Parse(sInput[i], System.Globalization.NumberStyles.HexNumber); 
} 

DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); 
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey); 
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey); 
ICryptoTransform desencrypt = DES.CreateDecryptor(); 
result = desencrypt.TransformFinalBlock(data, 0, data.Length); 
return Encoding.Default.GetString(result); 
} 
catch (Exception ex) 
{ 
//ex.Message = "DES解密異常"; 
throw ex; 
} 
} 
} 
}