C#加解密处理封装源代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;
using System.Xml;

namespace MyQuery.Utils
{
    /// <summary>
    /// 加解密处理方法工具
    /// by 贾世义 2009-3-5
    /// </summary>
    public static class EncryptHelper
    {
        /// <summary>
        /// 获得MD5加密后的字符串（不可逆）
        /// </summary>
        /// <param name="password">明码</param>
        /// <returns></returns>
        public static string GetPassword(string password)
        {
            string result = "";
            MD5 md5 = MD5.Create();//实例化一个md5对像
            // 加密后是一个字节类型的数组，这里要注意编码UTF8/Unicode等的选择　
            byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(password));
            // 通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得
            for (int i = 0; i < s.Length; i++)
            {
                // 将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符
                result = result + s[i].ToString("X");
            }
            return result;
        }
        /// <summary>
        /// 获得Des加密后字符串
        /// </summary>
        /// <param name="data">待加密字符</param>
        /// <param name="keyCode1">密钥</param>
        /// <param name="keyCode2">密钥</param>
        /// <returns></returns>
        public static string DesEncode(string data, string keyCode1, string keyCode2)
        {
            byte[] byKey = GetKey(keyCode1);
            byte[] byIV = GetKey(keyCode2);

            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            int i = cryptoProvider.KeySize;
            MemoryStream ms = new MemoryStream();
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);

            StreamWriter sw = new StreamWriter(cst);
            sw.Write(data);
            sw.Flush();
            cst.FlushFinalBlock();
            sw.Flush();
            return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);

        }

        /// <summary>
        /// 获得Des解密后字符串
        /// </summary>
        /// <param name="data">待解密字符串</param>
        /// <param name="keyCode1">密钥</param>
        /// <param name="keyCode2">密钥</param>
        /// <returns></returns>
        public static string DesDecode(string data, string keyCode1, string keyCode2)
        {
            byte[] byKey = GetKey(keyCode1);
            byte[] byIV = GetKey(keyCode2);

            byte[] byEnc;
            try
            {
                byEnc = Convert.FromBase64String(data);
            }
            catch
            {
                return null;
            }

            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            MemoryStream ms = new MemoryStream(byEnc);
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cst);
            return sr.ReadToEnd();
        }
    }
}

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