Encrypt.cs

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

public class Encrypt
{
    public Encrypt()
    { }

    #region MD5加密
    /// <summary>
    ///  MD5加密
    /// </summary>
    public static string MD5Encrypt(string Text)
    {
        return MD5Encrypt(Text, "");
    }

    /// <summary> 
    ///  MD5加密 
    /// </summary> 
    public static string MD5Encrypt(string Text, string sKey)
    {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        byte[] inputByteArray = Encoding.Default.GetBytes(Text);
        //des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
        //des.IV =  ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
        cs.Write(inputByteArray, 0, inputByteArray.Length);
        cs.FlushFinalBlock();
        StringBuilder ret = new StringBuilder();
        foreach (byte b in ms.ToArray())
        {
            ret.AppendFormat("{0:X2}", b);
        }
        return ret.ToString();
    }
    #endregion

    #region MD5解密
    /// <summary>
    ///  MD5解密
    /// </summary>
    public static string MD5Decrypt(string Text)
    {
        return MD5Decrypt(Text, "");
    }

    /// <summary> 
    ///  MD5解密
    /// </summary>  
    public static string MD5Decrypt(string Text, string sKey)
    {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        int len;
        len = Text.Length / 2;
        byte[] inputByteArray = new byte[len];
        int x, i;