使用ASP.Net加密Cookie

 {   //定義DES的Provider
    DESCryptoServiceProvider desprovider =
    new DESCryptoServiceProvider();
    //轉換解密的字符串為二進制
    byte[] buffer = Convert.FromBase64String(valueString);
    //定義內存流
    MemoryStream memoryStream = new MemoryStream();
    //定義加密流
    CryptoStream cryptoStream = new CryptoStream(memoryStream,
    desprovider.CreateEncryptor(Key64,IV64),
    CryptoStreamMode.Read);
    //定義讀IO流
    StreamReader readerStream = new StreamReader(cryptoStream);
    //返回解密后的字符串
    return(readerStream.ReadToEnd());
    }
    return(null);
    }
    public static String EncryptTripleDES(String valueString)
    {
    if(valueString != "")
    {   //定義TripleDES的Provider
    TripleDESCryptoServiceProvider triprovider =
    new TripleDESCryptoServiceProvider();
    //定義內存流
    MemoryStream memoryStream = new MemoryStream();
    //定義加密流
    CryptoStream cryptoStream = new CryptoStream(memoryStream,
    triprovider.CreateEncryptor(Key192,IV192),
    CryptoStreamMode.Write);
    //定義寫IO流
    StreamWriter writerStream = new StreamWriter(cryptoStream);
    //寫入加密后的字符流
    writerStream.Write(valueString);
    writerStream.Flush();
    cryptoStream.FlushFinalBlock();
    memoryStream.Flush();
    //返回加密后的字符串
    return(Convert.ToBase64String(memoryStream.GetBuffer(),0,
    (int)memoryStream.Length));
    }
    return(null);
    }
    public static String DecryptTripleDES(String valueString)
    {
    if(valueString != "")
    {   //定義TripleDES的Provider
    TripleDESCryptoServiceProvider triprovider =
    new TripleDESCryptoServiceProvider();
    //轉換解密的字符串為二進制
    byte[] buffer = Convert.FromBase64String(valueString);
    //定義內存流
    MemoryStream memoryStream = new MemoryStream();
    //定義加密流

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