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, 0, 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, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 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, IV), CryptoStreamMode.Write); 
cs.Write(inputByteArray, 0, 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; 
} 
} 
} 
}