使用AES/CBC/NoPadding算法解密字符串

我想AES/CBC/Nopadding在c#Windows Phone 8应用程序中解密加密Sting .我的字符串在IsolatedSorage.我粘贴了垃圾桶HERE.

从这篇文章我使用AesManaged类来解密.但是如何设置填充,NoPadding因为默认情况下填充设置为PKCS7从这里开始.

        string fileName = "titlepage.xhtml";

        if (fileStorage.FileExists(fileName))
        {
            IsolatedStorageFileStream someStream = fileStorage.OpenFile(fileName, System.IO.FileMode.Open, FileAccess.Read);
            using (StreamReader reader = new StreamReader(someStream))
            {
                str1 = reader.ReadToEnd();

                MessageBox.Show(str1);

                try
                {
                    string text = Decrypt(str1, "****************", "****************");

                    MessageBox.Show(text);
                }
                catch (CryptographicException cryptEx)
                {
                    MessageBox.Show(cryptEx.Message, "Encryption Error", MessageBoxButton.OK);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "General Error", MessageBoxButton.OK);
                }
            }
        }

    public string Decrypt(string dataToDecrypt, string password, string salt)
    {
        AesManaged aes = null;
        MemoryStream memoryStream = null;

        try
        {
            //Generate a Key based on a Password and HMACSHA1 pseudo-random number generator
            //Salt must be at least 8 bytes long
            //Use an iteration count of at least 1000
            Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(password, Encoding.UTF8.GetBytes(salt), 10000);               

            //Create AES algorithm
            aes = new AesManaged();
            //Key derived from byte array with 32 pseudo-random key bytes
            aes.Key = rfc2898.GetBytes(32);
            //IV derived from byte array with 16 pseudo-random key bytes
            aes.IV = rfc2898.GetBytes(16);

            //Create Memory and Crypto Streams
            memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, aes.CreateDecryptor(), CryptoStreamMode.Write);

            byte[] data = Convert.FromBase64String(dataToDecrypt);
            cryptoStream.Write(data, 0, data.Length);
            cryptoStream.FlushFinalBlock();

            //Return Decrypted String
            byte[] decryptBytes = memoryStream.ToArray();

            //Dispose
            if (cryptoStream != null)
                cryptoStream.Dispose();

            //Retval
            return Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length);
        }
        finally
        {
            if (memoryStream != null)
                memoryStream.Dispose();

            if (aes != null)
                aes.Clear();
        }            
    }

编辑1:

当我在最后一行解密我的加密字符串时

 byte[] data = Convert.FromBase64String(dataToDecrypt);

转移Finally block并获得例外The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters in decrypted string.

这有点混乱,这是在Windows Phone中支持Decrypt的类.

如果我完全错误,请向我建议关于Windows Phone中算法的文章

编辑2:

如下面的答案所示"我将cyperText作为字节获得,它在解密方面很好.但它给出了描述的例外

       [Cryptography_SSD_InvalidDataSize]
    Arguments: 
    Debugging resource strings are unavailable. Often the key and arguments provide 
sufficient information to diagnose the problem

我认为问题是IV [盐键]或设置填充到AesManged.但是我无法在Windows Phone 中将填充属性更改为AesManaged.默认情况下,填充到AesManged是PKCS7.我想换到NoPadding.因为我的cyperText使用AES/CBC/NoPadding算法加密"