加密解密工具

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

namespace 加密解密工具
{
    class 加密解密
    {
        public static string EncryptDES3(string original, string password)
        {
            if ((original == null) || (original == ""))
            {
                return "";
            }
            if ((password == null) || (password == ""))
            {
                password = "secretpassword1!";
            }
            byte[] buffer = new MD5CryptoServiceProvider().ComputeHash(Encoding.Unicode.GetBytes(password));
            TripleDESCryptoServiceProvider provider = new TripleDESCryptoServiceProvider
            {
                Key = buffer,
                Mode = CipherMode.ECB
            };
            byte[] bytes = Encoding.Unicode.GetBytes(original);
            string str = Convert.ToBase64String(provider.CreateEncryptor().TransformFinalBlock(bytes, 0, bytes.Length));
            provider = null;
            return str;
        }

        public static string DecryptDES3(string original, string password)
        {
            if ((original == null) || (original == ""))
            {
                return "";
            }
            if ((password == null) || (password == ""))
            {
                password = "secretpassword1!";
            }
            byte[] buffer = new MD5CryptoServiceProvider().ComputeHash(Encoding.Unicode.GetBytes(password));
            TripleDESCryptoServiceProvider provider = new TripleDESCryptoServiceProvider
            {
                Key = buffer,
                Mode = CipherMode.ECB
            };
            try
            {
                byte[] inputBuffer = Convert.FromBase64String(original);
                string str = Encoding.Unicode.GetString(provider.CreateDecryptor().TransformFinalBlock(inputBuffer, 0, inputBuffer.Length));
                provider = null;
                return str;
            }
            catch
            {
                MessageBox.Show("请输入正确的解密字符串！");
                return "";
            }
        }

    }
}