using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace EAS.Explorer
{
    /// <summary>
    /// 用户密码提供者接口。
    /// </summary>
    public interface IPasswordProvider
    {
        /// <summary>
        /// 加密指定的密码。
        /// </summary>
        /// <param name="password">要加密的密码。</param>
        ///<returns>加载后的密码。</returns>
        byte[] Encrypt(string password);

        /// <summary>
        /// 验证给定的密码是否和指定的密钥匹配。
        /// </summary>
        /// <param name="password">要验证的密码。</param>
        /// <param name="key">要验证的密钥。密钥的长度为64个字节。</param>
        /// <returns>如果可以通过指定的密钥生成和key相匹配的密钥，则返回true；否则返回false。</returns>
        bool Verify(string password, byte[] key);
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using EAS.Explorer;
using System.Security.Cryptography;
using System.Text;
using System.IO;
using System.Text;

namespace My.Passwords
{
    public class MD5Password : IPasswordProvider
    {
        #region IPasswordProvider 成员

        public byte[] Encrypt(string password)
        {
            byte[] result = Encoding.Default.GetBytes(password.Trim());
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] output = md5.ComputeHash(result);
            byte[] buffer = new byte[64];
            Buffer.BlockCopy(output, 0, buffer, 0, 16);
            return buffer;
        }

        public bool Verify(string password, byte[] key)
        {
            byte[] result = Encoding.Default.GetBytes(password.Trim());
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] output = md5.ComputeHash(result);
            byte[] buffer = new byte[64];
            Buffer.BlockCopy(output, 0, buffer, 0, 16);
            return EAS.Security.Bytes.Equals(buffer, key);
        }

        #endregion
    }
}

<!--密码算法-->
      <object name="PasswordProvider" assembly="My.Passwords" type="My.Passwords.MD5Password" LifestyleType="Singleton" />