Question

在使用C＃加密音频文件时，我得到一个例外，即“指定的本地化向量（IV）与算法的块大小不匹配”。我正在使用密码学课程提供的Rijndael算法。我该怎么办才能解决这个异常？我的代码如下：

      public void EncryptFile(string inputFile, string outputFile)
      {

        try
        {
            inputFile = textBox_path.Text;
            String password = "keykey";

            UnicodeEncoding UE = new UnicodeEncoding();
            byte[] key = UE.GetBytes(password);
            string cryptFile = outputFile;
            FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);


            RijndaelManaged RMCrypto = new RijndaelManaged();
            CryptoStream cs = new CryptoStream(fsCrypt, RMCrypto.CreateEncryptor(key, key), CryptoStreamMode.Write);

            FileStream fsIn = new FileStream(inputFile, FileMode.Open);

            int data;
            while ((data = fsIn.ReadByte()) != -1)
                cs.WriteByte((byte)data);
            fsIn.Close();
            cs.Close();
            fsCrypt.Close();
            MessageBox.Show("encryption is completed!!");
        }
        catch(Exception e)
        {
            MessageBox.Show(e.Message);

        }

  }

我的函数调用是：

Answer 1

有一个类似的问题here。

使用Rijndael，您可以选择块大小为128,160,192,224或256位。然后，您必须选择相同长度的初始化向量：

                using (RijndaelManaged rm = new RijndaelManaged())
                {
                    rm.BlockSize = 128;
                    Rfc2898DeriveBytes keyDerivator = new Rfc2898DeriveBytes(password, salt, KeyGenIterationCount); //derive key and IV from password and salt using the PBKDF2 algorithm
                    rm.IV = keyDerivator.GetBytes(16); //16 bytes (128 bits, same as the block size)
                    rm.Key = keyDerivator.GetBytes(32);

                    //(encrypt here)
                }

无论如何，我建议使用AesCryptoServiceProvider类，因为它是FIPS兼容的。点击此处了解有关差异的更多信息：http://blogs.msdn.com/b/shawnfa/archive/2006/10/09/the-differences-between-rijndael-and-aes.aspx

加密音频文件时出现异常

1 个答案: