asp.net 字符串加密解密技术

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace www
{
public partial class jiami : System.Web.UI.Page
{
protected void Page_Load(object sender,EventArgs e)
{
Bind();
}
private void Bind()
{
//加密
this.Title = DesEncrypt("pwd","abcd1234");
this.Title += DesDecrypt(this.Title,"abcd1234");
Response.Write(DesDecrypt("2ikCw0TqKGo=","abcd1234"));
}
/// <summary>
/// 加密字符串
/// 注意:密钥必须为８位
/// </summary>
/// <param name="strText">字符串</param>
/// <param name="encryptKey">密钥</param>
/// <param name="encryptKey">返回加密后的字符串</param>
public string DesEncrypt(string inputString,string encryptKey)
{
byte[] byKey = null;
byte[] IV = { 0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF };
try
{
byKey = System.Text.Encoding.UTF8.GetBytes(encryptKey.Substring(0,8));
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.UTF8.GetBytes(inputString);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms,des.CreateEncryptor(byKey,IV),CryptoStreamMode.Write);
cs.Write(inputByteArray,inputByteArray.Length);
cs.FlushFinalBlock();
return Convert.ToBase64String(ms.ToArray());
}
catch (System.Exception error)
{
//return error.Message;
return null;
}
}
/// <summary>
/// 解密字符串
/// </summary>
/// <param name="this.inputString">加了密的字符串</param>
/// <param name="decryptKey">密钥</param>
/// <param name="decryptKey">返回解密后的字符串</param>
public string DesDecrypt(string inputString,string decryptKey)
{
byte[] byKey = null;
byte[] IV = { 0x12,0xEF };
byte[] inputByteArray = new Byte[inputString.Length];
try
{
byKey = System.Text.Encoding.UTF8.GetBytes(decryptKey.Substring(0,8));
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
inputByteArray = Convert.FromBase64String(inputString);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms,des.CreateDecryptor(byKey,inputByteArray.Length);
cs.FlushFinalBlock();
System.Text.Encoding encoding = new System.Text.UTF8Encoding();
return encoding.GetString(ms.ToArray());
}
catch (System.Exception error)
{
//return error.Message;
return null;
}
}
}
}