C# DES加密字符串加密类模块

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//***********************************************************************//类模块名称：encryptDES//版权所有：米特仪表公司版权所有//开发作者：段利庆(Lee)// QQ:14035344// http://www.duanliqing.kudo.cn// http://leek.woku.com//创建日期：2010-08-19//功能描述：DES加密字符串加密类模块//***********************************************************************using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;//using System.Windows.Forms;using System.Security.Cryptography;using System.IO;namespace Ex04_47{ /// <summary> /// DES加密字符串加密类模块 /// </summary> class encryptDES { /// <summary> /// 加密 /// </summary> /// <param name="key">密码只可以为单字节字符（0..9 a..z） </param> /// <returns></returns> public string Encrypt(string skey,string str) { try { DESCryptoServiceProvider descsp = new DESCryptoServiceProvider(); byte[] key = Encoding.Unicode.GetBytes(skey); byte[] data = Encoding.Unicode.GetBytes(str.Trim()); MemoryStream MStream = new MemoryStream(); CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write); CStream.Write(data, 0, data.Length); CStream.FlushFinalBlock(); return Convert.ToBase64String(MStream.ToArray()); } catch (Exception ex) { //MessageBox.Show(ex.Message, "信息", MessageBoxButtons.OK, MessageBoxIcon.Information); return ""; } } /// <summary> /// 解密 /// </summary> /// <param name="key">密码只可以为单字节字符（0..9 a..z）</param> /// <returns></returns> public string Decrypt(string skey, string str) { try { DESCryptoServiceProvider descsp = new DESCryptoServiceProvider(); byte[] key = Encoding.Unicode.GetBytes(skey); byte[] data = Convert.FromBase64String(str.Trim()); MemoryStream MStream = new MemoryStream(); CryptoStream CStream = new CryptoStream(MStream, descsp.CreateDecryptor(key, key), CryptoStreamMode.Write); CStream.Write(data, 0, data.Length); CStream.FlushFinalBlock(); return Encoding.Unicode.GetString(MStream.ToArray()); } catch (Exception ex) { //MessageBox.Show(ex.Message, "信息", MessageBoxButtons.OK, MessageBoxIcon.Information); return ""; } } }}