CS文件：
Rijndael算法//App_Code
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace DataCrypto
{
/**//// <summary>
/// DataCrypto 的摘要說明
/// </summary>
public class SymmetricMethod
{
private SymmetricAlgorithm mobjCryptoService;
private string Key;
/**//// <summary>
/// 對稱加密類的構造函數
/// </summary>
public SymmetricMethod()
{
mobjCryptoService = new RijndaelManaged();
Key = "lijianfufaicaixiaoke";
}
/**//// <summary>
/// 獲得密鑰
/// </summary>
/// <returns>密鑰</returns>
private byte[] GetLegalKey()
{
string sTemp = Key;
mobjCryptoService.GenerateKey();
byte[] bytTemp = mobjCryptoService.Key;
int KeyLength = bytTemp.Length;
if (sTemp.Length > KeyLength)
sTemp = sTemp.Substring(0, KeyLength);
else if (sTemp.Length < KeyLength)
sTemp = sTemp.PadRight(KeyLength, ' ');
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}
/**//// <summary>
/// 獲得初始向量IV
/// </summary>
/// <returns>初試向量IV</returns>
private byte[] GetLegalIV()
{
string sTemp = "caoxiaokeailijianfu";
mobjCryptoService.GenerateIV();
byte[] bytTemp = mobjCryptoService.IV;
int IVLength = bytTemp.Length;
if (sTemp.Length > IVLength)
sTemp = sTemp.Substring(0, IVLength);
else if (sTemp.Length < IVLength)
sTemp = sTemp.PadRight(IVLength, ' ');
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}
/**//// <summary>
/// 加密方法
/// </summary>
/// <param name="Source">待加密的串</param>
/// <returns>經過加密的串</returns>
public string Encrypto(string Source)
{
byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
MemoryStream ms = new MemoryStream();
mobjCryptoService.Key = GetLegalKey();
mobjCryptoService.IV = GetLegalIV();
ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
cs.Write(bytIn, 0, bytIn.Length);
cs.FlushFinalBlock();
ms.Close();
byte[] bytOut = ms.ToArray();
return Convert.ToBase64String(bytOut);
}
/**//// <summary>
/// 解密方法
/// </summary>
/// <param name="Source">待解密的串</param>
/// <returns>經過解密的串</returns>
public string Decrypto(string Source)
{
byte[] bytIn = Convert.FromBase64String(Source);
MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
mobjCryptoService.Key = GetLegalKey();
mobjCryptoService.IV = GetLegalIV();
ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cs);
return sr.ReadToEnd();
}
}
}前臺顯示： protected void Page_Load(object sender, EventArgs e)
{
DataCrypto.SymmetricMethod sm = new DataCrypto.SymmetricMethod();
string a = sm.Encrypto("asdf").ToString().Trim();
string b = sm.Decrypto(a).ToString();
Response.Write(a+"<br>"+b);
}