EncryptRule

aes.js

'use strict';
const crypto = require('crypto');

const mac = '00226e2fc269';
const model = 'EVPAD-6P';
const real_mac = '62a6fbce3641';
const real_model = 'ONEPLUS A5000';

function md5hex(str) {
  const md5 = crypto.createHash('md5');
  return md5.update(str, 'binary').digest('hex');
}

function getAlgorithm(keyBase64) {
  const key = Buffer.from(keyBase64, 'utf8');
  switch (key.length) {
    case 16:
      return 'aes-128-cbc';
    case 32:
      return 'aes-256-cbc';
  }
  throw new Error('Invalid key length: ' + key.length);
}

function encrypt(plainText, keyBase64, ivBase64) {
  const key = Buffer.from(keyBase64, 'utf8');
  const iv = Buffer.from(ivBase64, 'utf8');

  const cipher = crypto.createCipheriv(getAlgorithm(keyBase64), key, iv);
  let encrypted = cipher.update(plainText, 'utf8', 'base64');
  encrypted += cipher.final('base64');
  return encrypted;
}

function decrypt(messagebase64, keyBase64, ivBase64) {
  const key = Buffer.from(keyBase64, 'utf8');
  const iv = Buffer.from(ivBase64, 'utf8');

  const decipher = crypto.createDecipheriv(getAlgorithm(keyBase64), key, iv);
  let decrypted = decipher.update(messagebase64, 'base64');
  decrypted += decipher.final();
  return decrypted;
}

function getSoDecrypKey(macAddr = mac, modelName = model) {
  return md5hex(macAddr.substring(4, 10) + '036014a5' + modelName).substring(8, 24);
}

function getSoEncrypKey(macAddr = mac, time) {
  return md5hex(macAddr.substring(4, 10) + '036014a5' + time).substring(8, 24);
}

function getSoEncrypDevKey(time) {
  const table = '0123456789ABCDEF';
  const result = new Array(32);
  const len = time.length;
  for (let i = 0; i < 32; i++) {
    const key = i % len;
    const index = Number(time[key]) + i;
    result[i] = table[index % 16];
  }
  return result.join('');
}

console.log('fake dec key:', getSoDecrypKey(mac, model));
console.log('real dec key:', getSoDecrypKey(real_mac, real_model));

const utctime = '1670638443934';
console.log('fake enc key:', getSoEncrypKey(mac, utctime));
console.log('real enc key:', getSoEncrypKey(real_mac, utctime));
const rawKey = getSoEncrypDevKey(utctime);
console.log('enc dev key:', rawKey.substring(0, 8) + rawKey.slice(-8));
console.log('enc dev iv:', rawKey.substring(8, 24));

说起来不换 esm 么？都 2202 年了（

只是个逆向脚本而已，怎么简单怎么来