const crypto = require('crypto');
const fs = require('fs');
const child_process = require('child_process');

const keyPath = 'HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Cryptography';
const keyValue   = 'MachineGuid';
const passPath = 'HKEY_CURRENT_USER\\SOFTWARE\\HwaSmart';
const passValue   = 'BDAuthorization';

function cryptMD5(GUID) {
  let md5 = crypto.createHash('md5');
  let ciphertext = md5.update(GUID).digest('hex')
  return ciphertext.slice(0,8)+'-'+ciphertext.slice(8,12)+'-'+ciphertext.slice(12,16)+'-'+ciphertext.slice(16,20)+'-'+ciphertext.slice(20,32);
}

fs.readFile('./KeyWord.txt', 'utf-8', (err, key) => {
  if (err) {
    if (err.code === 'ENOENT') {
      console.error('file not exist');
      return;
    }
    console.error(err, 'open');
    return;
  }
  child_process.exec(`REG QUERY ${keyPath} /v ${keyValue}`,function(error,stdout,stderr){
    console.log('stderr:'+stderr);
      if(error != null){
        console.log('exec error:'+error);
        return
      }
      child_process.exec(`reg add ${passPath} /v ${passValue} /t REG_SZ /d ${cryptMD5(stdout.slice(83,119) + key)} /f`);
  }); 
});