QR code encryption code for Taiwanese electronic invoice in nodejs (QRCode電子發票AES加密)

QRCodeAESInNodejs.md

Reference:

• 電子發票整合服務平台 加解密 API 使用說明書 版本 : 1.12

• 電子發票證明聯一維及二維條碼規格說明 版本: 1.8

• 財政部電子發票整合平台

QREncrypter.js

const crypto = require('crypto');

const QRCodeAesEncodeKey = Buffer.from(process.env.QRCODE_AES_KEY, 'hex');
const EINVOICE_IV = Buffer.from('Dt8lyToo17X/XkXaQvihuA==', 'base64');
const ALGORITHM = 'aes-128-cbc';

module.exports = {
  qrcodeEncryptor: (str) => {
    const cipher = crypto.createCipheriv(ALGORITHM, QRCodeAesEncodeKey, EINVOICE_IV);
    const encodedDataBuf = Buffer.concat([
      cipher.update(str),
      cipher.final()
    ]);
    return Buffer.from(encodedDataBuf).toString('base64').padEnd(0x18);
  },
  qrcodeDecryptor: (encryptStrWith64) => {
    const encryptdata = Buffer.from(encryptStrWith64, 'base64');
    const decipher = crypto.createDecipheriv(ALGORITHM, QRCodeAesEncodeKey, EINVOICE_IV);
    const decodedBuf = Buffer.concat([
      decipher.update(encryptdata),
      decipher.final()
    ]);
    return Buffer.from(decodedBuf).toString();
  }
};