Encrypt（加密解密）

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, "litianping");
    }

    /// <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, "litianping");
    }

    /// <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;
        for (x = 0; x < len; x++)
        {
            i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
            inputByteArray[x] = (byte)i;
        }
        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.CreateDecryptor(), CryptoStreamMode.Write);
        cs.Write(inputByteArray, 0, inputByteArray.Length);
        cs.FlushFinalBlock();
        return Encoding.Default.GetString(ms.ToArray());
    }
    #endregion

    #region TripleDES加密
    /// <summary>
    /// TripleDES加密
    /// </summary>
    public static string TripleDESEncrypting(string strSource)
    {
        try
        {
            byte[] bytIn = Encoding.Default.GetBytes(strSource);
            byte[] key = { 42, 16, 93, 156, 78, 4, 218, 32, 15, 167, 44, 80, 26, 20, 155, 112, 2, 94, 11, 204, 119, 35, 184, 197 }; //定义密钥
            byte[] IV = { 55, 103, 246, 79, 36, 99, 167, 3 };  //定义偏移量
            TripleDESCryptoServiceProvider TripleDES = new TripleDESCryptoServiceProvider();
            TripleDES.IV = IV;
            TripleDES.Key = key;
            ICryptoTransform encrypto = TripleDES.CreateEncryptor();
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
            cs.Write(bytIn, 0, bytIn.Length);
            cs.FlushFinalBlock();
            byte[] bytOut = ms.ToArray();
            return System.Convert.ToBase64String(bytOut);
        }
        catch (Exception ex)
        {
            throw new Exception("加密时候出现错误!错误提示: " + ex.Message);
        }
    }
    #endregion

    #region TripleDES解密
    /// <summary>
    /// TripleDES解密
    /// </summary>
    public static string TripleDESDecrypting(string Source)
    {
        try
        {
            byte[] bytIn = System.Convert.FromBase64String(Source);
            byte[] key = { 42, 16, 93, 156, 78, 4, 218, 32, 15, 167, 44, 80, 26, 20, 155, 112, 2, 94, 11, 204, 119, 35, 184, 197 }; //定义密钥
            byte[] IV = { 55, 103, 246, 79, 36, 99, 167, 3 };   //定义偏移量
            TripleDESCryptoServiceProvider TripleDES = new TripleDESCryptoServiceProvider();
            TripleDES.IV = IV;
            TripleDES.Key = key;
            ICryptoTransform encrypto = TripleDES.CreateDecryptor();
            System.IO.MemoryStream ms = new System.IO.MemoryStream(bytIn, 0, bytIn.Length);
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
            StreamReader strd = new StreamReader(cs, Encoding.Default);
            return strd.ReadToEnd();
        }
        catch (Exception ex)
        {
            throw new Exception("解密时候出现错误!错误提示: " + ex.Message);
        }
    }
    #endregion
}