c# - 加密字节数组，从字符串转换为8位整数数组

Question

我正在尝试在 python 中记录音频原始数据，加密数据并将其发送到 .NET 服务器，在该服务器中我解密接收到的数据并转换为字节数组。当我将接收到的数据转换为字节数组时，像这样 Encoding.ASCII.GetBytes(decryptedData) 一切都几乎正常。但发送数据的最大字节值为63，发送数据的最大字节值为255。发送和接收数据示例:

发送数据

3, 0, 3, 0, 3, 0, 4, 0, 4, 0, 2, 0, 252, 255, 1, 0, 255, 255, 1, 0, 0, 0...

收到数据

3, 0, 3, 0, 3, 0, 4, 0, 4, 0, 2, 0, 63, 63, 1, 0, 63, 63, 1, 0, 0, 0...

当我将接收到的数据转换为字节数组时，像这样 Encoding.UTF8.GetBytes(DecryptData(aes, data)) 一切都几乎正常。但高值(value)就不一样了。发送和接收数据的示例:

发送数据

6, 0, 8, 0, 250, 255, 255, 255, 3, 0, 6, 0, 2, 0, 4, 0, 3, 0, 6, 0, 3, 0...

收到数据

6, 0, 8, 0, 239, 191, 189, 239, 191, 189, 239, 191, 189, 239, 191, 189, 3, 0, 6, 0, 2, 0, 4, 0 , 3, 0, 6, 3, 0...

似乎转换会产生更多变量。我不知道。

这里是记录、加密和发送数据的python代码:

import pyaudio
import sys
import socket
import struct
import base64
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad

key = b"bpjAqrgO2N8q7Rfj8IHzeRxmP1W4HwUTWCRi7DQgyDc="
iv = b"Ta6e1cZAWQMM0QI66JC74w=="

UDP_IP = "127.0.0.1"
UDP_PORT = 5005

chunk = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
RECORD_SECONDS = 5

pya = pyaudio.PyAudio()

stream = pya.open(format=FORMAT, channels=CHANNELS, rate=RATE, input=True, output=True, frames_per_buffer=chunk)

print ("recording")
for i in range(0, 44100 // chunk * RECORD_SECONDS):
    data = stream.read(chunk)
    print (struct.unpack('{}B'.format(len(data)), data))
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    cipher_suite = AES.new(base64.urlsafe_b64decode(key), AES.MODE_CBC, base64.urlsafe_b64decode(iv))
    cipher_text = cipher_suite.encrypt(pad(data, 16))
    sock.sendto(cipher_text, (UDP_IP, UDP_PORT))
    input ()
    # check for silence here by comparing the level with 0 (or some threshold) for 
    # the contents of data.
    # then write data or not to a file

print ("done")

stream.stop_stream()
stream.close()
pya.terminate()

这里是接收、解密和转换数据的C#代码:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace DOTNETServer
{
    class Program
    {
        private static string IP = "127.0.0.1";
        private static int Port = 5005;
        private static string Key = "bpjAqrgO2N8q7Rfj8IHzeRxmP1W4HwUTWCRi7DQgyDc=";
        private static string IV = "Ta6e1cZAWQMM0QI66JC74w==";

        static void Main(string[] args)
        {
            UDPServer(IPAddress.Parse(IP), Port);
            Console.ReadKey();
        }

        private static void UDPServer(IPAddress IP, int Port)
        {
            byte[] data = new byte[32768];
            IPEndPoint endPoint = new IPEndPoint(IP, Port);
            UdpClient client = new UdpClient(endPoint);

            SymmetricAlgorithm aes = new AesManaged();
            aes.KeySize = 256;
            aes.Key = Convert.FromBase64String(Key);
            aes.IV = Convert.FromBase64String(IV);

            while (true)
            {
                Console.WriteLine("Waiting for data.");
                data = client.Receive(ref endPoint);
                var convertedReceivedData = Encoding.ASCII.GetBytes(DecryptData(aes, data));
                Console.Write("(");
                foreach(var item in convertedReceivedData)
                {
                    Console.Write(item + ", ");
                }
                Console.Write(")");
            }
        }

        static byte[] EncryptText(SymmetricAlgorithm aesAlgorithm, string text)
        {
            ICryptoTransform encryptor = aesAlgorithm.CreateEncryptor(aesAlgorithm.Key, aesAlgorithm.IV);
            byte[] data = new byte[32768];
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter writer = new StreamWriter(cs))
                    {
                        writer.Write(text);
                    }
                }
                data = ms.ToArray();
            }

            return data;
        }

        static string DecryptData(SymmetricAlgorithm aes, byte[] data)
        {
            ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
            byte[] encryptedDataBuffer = data;
            string plainText = "";
            using (MemoryStream ms = new MemoryStream(encryptedDataBuffer))
            {
                using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
                {
                    using (StreamReader reader = new StreamReader(cs))
                    {
                        plainText = reader.ReadToEnd();
                    }
                }
            }

            return plainText;
        }
    }
}

Answer 1

好的，我根据 elgonzo 的建议解决了我的问题。当然，我从数据中打印每个字节的数据字节，而无需在 python 中进行任何转换或解包，如下所示:

data = stream.read(chunk)
for item in data:
    print (item)

在 .NET 应用程序中，只需使用 Rijndael 使用输入 byte[] 进行加密和解密，并将 byte[] 作为输出，如下所示:

public static byte[] Decrypt(byte[] cipherData, byte[] Key, byte[] IV)
{
    MemoryStream ms = new MemoryStream();
    Rijndael alg = Rijndael.Create();

    alg.Key = Key;
    alg.IV = IV;

    CryptoStream cs = new CryptoStream(ms, alg.CreateDecryptor(), CryptoStreamMode.Write);            
    cs.Write(cipherData, 0, cipherData.Length);
    cs.Close();

    return ms.ToArray();
}

再次感谢您，祝您有美好的一天:)