App_Code/Md5Pw.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Security.Cryptography;

/// <summary>
/// Md5Pw 的摘要说明
/// </summary>
public class Md5Pw
{
    /// <summary>
    /// md5加密，返回第6至13位置中的字符
    /// </summary>
    /// <param name="password">密码明文</param>
    /// <returns></returns>
    public string Md5(string password)
    {
        MD5CryptoServiceProvider hashmd5;
        hashmd5 = new MD5CryptoServiceProvider();
        return BitConverter.ToString(hashmd5.ComputeHash(Encoding.Default.GetBytes(password))).Replace("-", "").Substring(6, 13);
    }
    public string Md5_(string password)
    {
        MD5CryptoServiceProvider hashmd5;
        hashmd5 = new MD5CryptoServiceProvider();
        return BitConverter.ToString(hashmd5.ComputeHash(Encoding.Default.GetBytes(password))).Replace("-", "").ToLower();
    }
}