Encrypt and Decrypt in nodejs using crypto module

encrypt_decrypt.js

// https://gist.github.com/vlucas/2bd40f62d20c1d49237a109d491974eb
"use strict";

const { errorLog } = require("./logger");

const crypto = require("crypto");

const ENCRYPTION_KEY =
  process.env.ENCRYPTION_KEY || "Dw-3]v,#FX@1gerbSAC4Jhn2=$!q/K.Z"; // Must be 256 bits (32 characters)
const IV_LENGTH = 16; // For AES, this is always 16

function encrypt(text, key = ENCRYPTION_KEY) {
  if (typeof text == "undefined" || text == null) {
    errorLog.error(new Error("no input given for encrypt function"));
    return false;
  }
  if (typeof text != "string") {
    text = text + "";
  }

  if (text == "") {
    return "";
  }

  try {
    let iv = crypto.randomBytes(IV_LENGTH);
    let cipher = crypto.createCipheriv("aes-256-cbc", new Buffer(key), iv);
    let encrypted = cipher.update(text);

    encrypted = Buffer.concat([encrypted, cipher.final()]);

    return iv.toString("hex") + ":" + encrypted.toString("hex");
  } catch (err) {
    errorLog.debug ? errorLog.error(err) : errorLog.error(new Error(err));
    return false;
  }
}

function decrypt(text, key = ENCRYPTION_KEY) {
  if (typeof text == "undefined" || text == null) {
    errorLog.error(new Error("no input given for decrypt function"));
    return false;
  }

  if (typeof text != "string") {
    text = text + "";
  }

  if (text == "") {
    return "";
  }
  try {
    let textParts = text.split(":");
    let iv = new Buffer(textParts.shift(), "hex");
    let encryptedText = new Buffer(textParts.join(":"), "hex");
    let decipher = crypto.createDecipheriv(
      "aes-256-cbc",
      new Buffer(ENCRYPTION_KEY),
      iv
    );
    let decrypted = decipher.update(encryptedText);

    decrypted = Buffer.concat([decrypted, decipher.final()]);

    return decrypted.toString();
  } catch (err) {
    errorLog.debug ? errorLog.error(err) : errorLog.error(new Error(err));
    return false;
  }
}

/**
 * @link https://gist.github.com/csanz/1181250/351ea1a7363c8a80944d572c70b769931ee94994
 */
function simpleEncrypt(text, key = process.env.simpleEncryptKey) {
  if (typeof text == "undefined" || text == null) {
    errorLog.error(new Error("no input given for simple encrypt function"));
    return false;
  }

  if (typeof text != "string") {
    text = text + "";
  }

  if (text == "") {
    return "";
  }

  try {
    var cipher = crypto.createCipher("aes-256-cbc", key);
    var crypted = cipher.update(text, "utf8", "hex");
    crypted += cipher.final("hex");
    return crypted;
  } catch (err) {
    errorLog.debug ? errorLog.error(err) : errorLog.error(new Error(err));
    errorLog.error(err + "  " + text);
    return false;
  }
}

function simpleDecrypt(text, key = process.env.simpleEncryptKey) {
  if (typeof text == "undefined" || text == null) {
    errorLog.error(new Error("no input given for simple decrypt function"));
    return false;
  }
  if (typeof text != "string") {
    text = text + "";
  }
  if (text == "") {
    return "";
  }
  try {
    var decipher = crypto.createDecipher("aes-256-cbc", key);
    var dec = decipher.update(text, "hex", "utf8");
    dec += decipher.final("utf8");
    return dec;
  } catch (err) {
    errorLog.debug ? errorLog.error(err) : errorLog.error(new Error(err));
    errorLog.error(err + "  " + text);
    return false;
  }
}

module.exports = { decrypt, encrypt, simpleEncrypt, simpleDecrypt };