TripleDES加密、解密算法

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

namespace WindowsFormsApplication1
{
#region TripleDES算法

    public class ClassTripleDES
    {
        public ClassTripleDES()
        {
        }

        //加密，使用密碼產生加密算法的公鑰，並使用TripleDES對密碼進行加密。
        public static string Encrypt(string pass)
        {
            try
            {
                byte[] bt = (new System.Text.UnicodeEncoding()).GetBytes(pass);
                PasswordDeriveBytes pdb = new PasswordDeriveBytes(pass, null);
                byte[] key = pdb.GetBytes(24);
                byte[] iv = pdb.GetBytes(8);
                MemoryStream ms = new MemoryStream();
                TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
                CryptoStream cs = new CryptoStream(ms, tdesc.CreateEncryptor(key, iv),
CryptoStreamMode.Write);
                cs.Write(bt, 0, bt.Length);
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray());
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        //解密，使用密碼產生加密算法的公鑰，並使用TripleDES對加密數據進行解密。

        public static string Decrypt(string str, string pass)
        {
            try
            {
                byte[] bt = Convert.FromBase64String(str);
                PasswordDeriveBytes pdb = new PasswordDeriveBytes(pass, null);
                byte[] key = pdb.GetBytes(24);
                byte[] iv = pdb.GetBytes(8);
                MemoryStream ms = new MemoryStream();
                TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
                CryptoStream cs = new CryptoStream(ms, tdesc.CreateDecryptor(key, iv),
CryptoStreamMode.Write);
                cs.Write(bt, 0, bt.Length);
                cs.FlushFinalBlock();
                return (new System.Text.UnicodeEncoding()).GetString(ms.ToArray());
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        //使用：
        //string str = Encrypt("bbb");
        //Console.WriteLine(Decrypt(str, "bbb"));

        //加密，使用密碼產生加密算法的公鑰，並使用TripleDES對密碼進行加密。

        public static string EncryptWithKey(string pass, string p_key)
        {
            try
            {
                byte[] bt = (new System.Text.UnicodeEncoding()).GetBytes(pass);
                PasswordDeriveBytes pdb = new PasswordDeriveBytes(p_key, null);
                byte[] key = pdb.GetBytes(24);
                byte[] iv = pdb.GetBytes(8);
                MemoryStream ms = new MemoryStream();
                TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
                CryptoStream cs = new CryptoStream(ms, tdesc.CreateEncryptor(key, iv),
CryptoStreamMode.Write);
                cs.Write(bt, 0, bt.Length);
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray());
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        //解密，使用密碼產生加密算法的公鑰，並使用TripleDES對加密數據進行解密。

        public static string DecryptWithKey(string str, string p_key)
        {
            try
            {
                byte[] bt = Convert.FromBase64String(str);
                PasswordDeriveBytes pdb = new PasswordDeriveBytes(p_key, null);
                byte[] key = pdb.GetBytes(24);
                byte[] iv = pdb.GetBytes(8);
                MemoryStream ms = new MemoryStream();
                TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
                CryptoStream cs = new CryptoStream(ms, tdesc.CreateDecryptor(key, iv),
CryptoStreamMode.Write);
                cs.Write(bt, 0, bt.Length);
                cs.FlushFinalBlock();
                return (new System.Text.UnicodeEncoding()).GetString(ms.ToArray());
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }
    #endregion