Csharp 为什么我的解密方法会抛出要解密的数据长度无效加密异常

这是一个非常常见的例外，但显然我找到的解决方案都没有解决我的问题.

我有一个加密和解密方法；我加密字符串并将其写入文件，然后从文件中读取字符串并解密(理论上).实际上，我得到了一个

CryptographicException:要解密的数据长度无效

在进程的解密端.

以下是完成所有工作的Main()种方法:

public static void Main()
{
    var filename = "test.encrypted";
    var plainText = "Lorem Ipsum is simply dummy text of the printing and typesetting industry.";

    string password = "A better password than this";
    string salt = "Sodium Chloride";

    var padding = PaddingMode.Zeros; // I have tried every padding mode to no avail

    var encrypted = Encrypt<AesManaged>(plainText, password, salt, padding);
    File.WriteAllBytes(filename, encrypted);

    var fileBytes = File.ReadAllBytes(filename);
    var decrypted = Decrypt<AesManaged>(fileBytes, password, salt, padding);

    Console.ReadLine();
}

加密端:

static byte[] Encrypt<T>(string plainText, string password, string salt, PaddingMode padding)
    where T : Symmetric算法rithm, new()
{
    var saltBytes = Encoding.Unicode.GetBytes(salt);
    var derivedBytes = new Rfc2898DeriveBytes(password, saltBytes);

    using (var algorithm = new T())
    {
        algorithm.Padding = padding;

        var key = derivedBytes.GetBytes(algorithm.KeySize >> 3);
        byte[] iv = new byte[algorithm.BlockSize >> 3];
        RNGCryptoServiceProvider.Create().GetNonZeroBytes(iv);

        var transform = algorithm.CreateEncryptor(key, iv);


        using (MemoryStream buffer = new MemoryStream())
        using (CryptoStream cryptoStream = new CryptoStream(buffer, transform, CryptoStreamMode.Write))
        using (StreamWriter writer = new StreamWriter(cryptoStream, Encoding.Unicode))
        {
            writer.Write(plainText);
            writer.Flush();  
             
            // cryptoStream.FlushFinalBlock() is called after writer.Flush()
            // or as part of the Dispose().
            // Calling it here causes a "you can't call that twice" exception.

            // prepend IV to the data
            return iv.Concat(buffer.ToArray()).ToArray();
        }
    }
}

... 还有另一面

static byte[] Decrypt<T>(byte[] encryptedData, string password, string salt, PaddingMode padding)
      where T : Symmetric算法rithm, new()
{
    var saltBytes = Encoding.Unicode.GetBytes(salt);

    var derivedBytes = new Rfc2898DeriveBytes(password, saltBytes);

    using (var algorithm = new T())
    {
        algorithm.Padding = padding;

        var key = derivedBytes.GetBytes(algorithm.KeySize >> 3);

        //IV is at the beginning of the data
        var iv = encryptedData.Take(algorithm.BlockSize >> 3).ToArray();
        encryptedData = encryptedData.Skip(iv.Length).ToArray();

        var transform = algorithm.CreateDecryptor(key, iv);

        using (MemoryStream buffer = new MemoryStream())
        using (CryptoStream stream = new CryptoStream(buffer, transform, CryptoStreamMode.Write))
        using (StreamWriter writer = new StreamWriter(stream, Encoding.Unicode))
        {
            writer.Write(encryptedData);
            writer.Flush();
            return buffer.ToArray();
        }
    }
}