CryptoStream不会解密内存流并且什么也不打印

Question

我正在尝试对内存流进行解密算法，但是我遇到的问题是，解密后生成的内存流始终为空

这是我的代码：

private MemoryStream Encrypt()
{
    byte[] toEncrypt = new byte[] { 1, 2, 3, 4, 5, 6 };

    int keySize = 256;
    int blockSize = 128;

    byte[] passwordBytes = generateRandomBytes();
    byte[] ivBytes = new byte[blockSize / 8];

    Buffer.BlockCopy(passwordBytes, 0, ivBytes, 0, ivBytes.Length);
    MemoryStream fsOut = new MemoryStream();

    using (RijndaelManaged AES = new RijndaelManaged())
    {
        AES.BlockSize = blockSize;
        AES.KeySize = keySize;
        AES.Mode = CipherMode.CFB;
        AES.FeedbackSize = 8;
        AES.Padding = PaddingMode.None;

        AES.Key = passwordBytes;
        AES.IV = ivBytes;

        using (var encryptor = AES.CreateEncryptor())
        using (var cs = new CryptoStream(new MemoryStream(toEncrypt, 0, toEncrypt.Length), encryptor, CryptoStreamMode.Read))
        {
            cs.CopyTo(fsOut);
        }
    }

    return fsOut;
}

private MemoryStream FileDecrypt(MemoryStream memStream)
{
    int keySize = 256;
    int blockSize = 128;

    byte[] passwordBytes = generateRandomBytes();
    byte[] ivBytes = new byte[blockSize / 8];

    Buffer.BlockCopy(passwordBytes, 0, ivBytes, 0, ivBytes.Length);
    MemoryStream fsOut = new MemoryStream();

    using (RijndaelManaged AES = new RijndaelManaged())
    {
        AES.BlockSize = blockSize;
        AES.KeySize = keySize;
        AES.Mode = CipherMode.CFB;
        AES.FeedbackSize = 8;
        AES.Padding = PaddingMode.None;

        AES.Key = passwordBytes;
        AES.IV = ivBytes;

        using (var decryptor = AES.CreateDecryptor())
        using (var cs = new CryptoStream(memStream, decryptor, CryptoStreamMode.Read))
        {
            cs.CopyTo(fsOut);
        }
    }

    /*
    RijndaelManaged AES = new RijndaelManaged();
    AES.KeySize = keySize;
    AES.BlockSize = blockSize;
    AES.Key = passwordBytes;
    AES.IV = ivBytes;
    AES.Padding = PaddingMode.None;
    AES.Mode = CipherMode.CFB;
    AES.FeedbackSize = 8;

    CryptoStream cs = new CryptoStream(memStream, AES.CreateDecryptor(), CryptoStreamMode.Read);
    MemoryStream fsOut = new MemoryStream();

    try
    {
        cs.CopyTo(fsOut);
    }
    catch (CryptographicException ex_CryptographicException)
    {
        Console.WriteLine("CryptographicException error: " + ex_CryptographicException.Message);
    }
    catch (Exception ex)
    {
        Console.WriteLine("Error: " + ex.Message);
    }

    try
    {
        cs.Close();
    }
    catch (Exception ex)
    {
        Console.WriteLine("Error by closing streams: " + ex.Message);
    }
    */

    return fsOut;
}

MemoryStream encrypted = Encrypt();
MemoryStream decrypted = FileDecrypt(encrypted);
Console.WriteLine("Decrypted: ", bytesToString(decrypted.GetBuffer()));

由于真正的问题在于从tcp连接接收到的文件创建的内存流，因此我尝试对阵列（1,2,3,4,5,6）进行测试加密。最后，我还要打印（1,2,3,4,5,6）。但是最后它只显示“ Decrypted：”，并且我没有收到任何错误或异常，执行过程很顺利。我在做什么错了？