json - 尝试使用 crypto-js 和 nodejs 解密

Question

我在微 Controller 和nodejs tcp服务器之间来回通信。微 Controller 将传感器数据形成一个 json 字符串。然后，微 Controller 将 json 字符串发送到 WiFi 模块。然后WiFi模块使用AES256以32个十六进制字符为 key 对数据进行加密，然后将加密数据发送到nodejs tcp服务器。

nodejs TCP 服务器使用 googlecode Crypto-JS 的 Crypto-JS 模块形式。

出于测试目的，我想将加密数据和解密数据输出到控制台。但是我不确定如何实现这一点。我尝试输出数据，但收到空白数据。例如，控制台应该显示如下内容:192.168.1.14:30001> some-json-string 除了我收到 192.168.1.14:30001>

旧代码:

  // I removed the old code to shrink this post and to remove any confusion.

编辑
我现在使用 NodeJS 提供的内置加密模块。我收到的错误是:

crypto.js:292 var ret = this._binding.final(); ^ TypeError: error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt
at Decipher.Cipher.final (crypto.js:292:27)
at decrypt (C:\Users\joes\Desktop\encrypt\tcp.js:18:24)
at Socket. (C:\Users\joes\Desktop\encrypt\tcp.js:44:23)
at Socket.emit (events.js:95:17)
at Socket. (_stream_readable.js:748:14)
at Socket.emit (events.js:92:17)
at emitReadable_ (_stream_readable.js:410:10)
at emitReadable (_stream_readable.js:406:5)
at readableAddChunk (_stream_readable.js:168:9)
at Socket.Readable.push (_stream_readable.js:130:10)

代码:

// Load the TCP Library
net = require('net');

// Load the Crypto Module
var crypto = require("crypto");

function encrypt(key, data) {
    var cipher = crypto.createCipher('aes256', key);
    var crypted = cipher.update(data, 'utf-8', 'hex');
    crypted += cipher.final('hex');

    return crypted;
}

function decrypt(key, data) {
    var decipher = crypto.createDecipher('aes256', key);
    var decrypted = decipher.update(data, 'hex', 'utf-8');
    decrypted += decipher.final('utf-8');

    return decrypted;
}

// Keep track of the chat clients
var clients = [];

// Start a TCP Server
net.createServer(function (socket) {

// Identify this client
socket.name = socket.remoteAddress + ":" + socket.remotePort

// Put this new client in the list
clients.push(socket);

// Send a nice welcome message and announce
socket.write("Welcome " + socket.name + "\n");
broadcast(socket.name + " joined the chat\n", socket);

// Handle incoming messages from clients.
socket.on('data', function (data) {
  var key = new Buffer('85CE6CCF67FBBAA8BB13479C3A6E084D', 'hex');

  // Attempt to decrypt data with the above key
  var decryptedText = decrypt(key, data);
  //console.log("Decrypted Text: " + decrypt(key, encrypt(key, '{"resTemp":"82.19","roomTemp":98,"ph":58,"ec":700}>')));

  broadcast(socket.name + "> " + decryptedText, socket);
  //console.log(data);
});

// Remove the client from the list when it leaves
socket.on('end', function () {
  clients.splice(clients.indexOf(socket), 1);
  broadcast(socket.name + " left the chat.\n");
});
// Send a message to all clients
function broadcast(message, sender) {
  clients.forEach(function (client) {
  // Don't want to send it to sender
  if (client === sender) return;
  client.write(message);
});
// Log it to the server output too
process.stdout.write(message)
}

}).listen(5000);

// Put a friendly message on the terminal of the server.
console.log("Chat server running at port 5000\n");

data 应该是一个缓冲对象并包含一个 json 字符串，例如:{"resTemp":"82.19","roomTemp":98,"ph":58,"ec":700}>
“>”是为了微 Controller 和wifi模块之间的数据流控制而特意设置的。在处理 json 字符串之前，我将删除“>”。

Answer 1

使用内置crypto模块的代码几乎是正确的。值得注意的是，encrypt() 中存在拼写错误，并且 key 需要是缓冲区。这是我使用的:

var crypto = require('crypto');

function encrypt(key, data) {
    var cipher = crypto.createCipher('aes256', key);
    var crypted = cipher.update(data, 'utf-8', 'hex');
    crypted += cipher.final('hex');

    return crypted;
}

function decrypt(key, data) {
    var decipher = crypto.createDecipher('aes256', key);
    var decrypted = decipher.update(data, 'hex', 'utf-8');
    decrypted += decipher.final('utf-8');

    return decrypted;
}

var key = new Buffer('85CE6CCF67FBBAA8BB13479C3A6E084D', 'hex');

decrypt(key, encrypt(key, 'hello world'));

// outputs: 'hello world'