JS Crypto Encryption Service

nodejs-crypto-encryption-service.txt

'use strict'
// use the following online tool for encryption and decryption testing
// https://www.javainuse.com/aesgenerator

const CryptoJS = require('crypto-js');

class EncryptionService {
  /**
   * Encrypts a plain-text string using AES-256 cipher with the following settings
   * Mode: CBC, Key Size: 256, Output Format: Base64
   * Intialization Vector (from config)
   * Secret Key (from config)
   * 
   * @param {*} plainTextToken 
   * @param {*} configData Reference to location of config data
   * @returns Encrypted Token string
   */
  encryptAES256Token(plainTextToken, configData) {
    const encryptionKey = CryptoJS.enc.Utf8.parse(configData.encryptionKey);
    const iv = CryptoJS.enc.Utf8.parse(configData.initializationVector);

    const encryptedToken = CryptoJS.AES.encrypt(CryptoJS.enc.Utf8.parse(plainTextToken), encryptionKey, {
      iv,
      mode: CryptoJS.mode.CBC
    })

    return encryptedToken.toString();
  }

  /**
   * Decrypts an AES-256 encrypted string with the following settings
   * Mode: CBC, Key Size: 256, Output Format: Base64
   * Intialization Vector (from config)
   * Secret Key (from config)
   * 
   * @param {string} token Encrypted token
   * @param {*} configData Reference to location of config data
   * @returns Decrypted Token string
   */
  decryptAES256Token(token, configData) {
    const encryptionKey = CryptoJS.enc.Utf8.parse(configData.encryptionKey);
    const iv = CryptoJS.enc.Utf8.parse(configData.initializationVector);

    const decrypted = CryptoJS.AES.decrypt(token, encryptionKey, { 
      iv, 
      mode: CryptoJS.mode.CBC
    })
    
    return decrypted.toString(CryptoJS.enc.Utf8);
  }
}

module.exports = {
  encryptionService: new EncryptionService()
}