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，使用密码产生加密算法的公钥，并使用TripleDES对密码进行加密。   

        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，使用密码产生加密算法的公钥，并使用TripleDES对加密数据进行解密。   

        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，使用密码产生加密算法的公钥，并使用TripleDES对密码进行加密。   

        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，使用密码产生加密算法的公钥，并使用TripleDES对加密数据进行解密。   

        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   

}