Sample codes for encrypting and decrypting by 3DES using node-forge or built-in crypto module

3des_using_node_builtin_crypto.js

const crypto = require("crypto");

/**
 * Encrypt 3DES using Node.js's crypto module * 
 * @param data A utf8 string
 * @param key Key would be hashed by md5 and shorten to maximum of 192 bits,
 * @returns {*} A base64 string
 */
function encrypt3DES(data, key) {
  const md5Key = crypto.createHash('md5').update(key).digest("hex").substr(0, 24);
  const cipher = crypto.createCipheriv('des-ede3', md5Key, '');

  let encrypted = cipher.update(data, 'utf8', 'base64');
  encrypted += cipher.final('base64');
  return encrypted;
}

/**
 * Decrypt 3DES using Node.js's crypto module 
 * @param data a base64 string
 * @param key Key would be hashed by md5 and shorten to max 192 bits,
 * @returns {*} a utf8 string
 */
function decrypt3DES(data, key) {
  const md5Key = crypto.createHash('md5').update(key).digest("hex").substr(0, 24);
  const decipher = crypto.createDecipheriv('des-ede3', md5Key, '');

  let encrypted = decipher.update(data, 'base64', 'utf8');
  encrypted += decipher.final('utf8');
  return encrypted;
}

3des_using_node_forge.js

/**
 * Encrypt by 3DES using node-forge
 * @param input utf8 string
 * @param key key is hashed by md5 and shorten to maximum 192 bits
 * @returns {String} Output is a base64 string
 */
function encrypt3DES(input, key) {
  var md5Key = forge.md.md5.create();
  md5Key.update(key);
  md5Key = md5Key.digest().toHex();

  var cipher = forge.cipher.createCipher('3DES-ECB', md5Key.substring(0, 24));
  cipher.start();
  cipher.update(forge.util.createBuffer(Buffer.from(input, "utf8").toString("binary")));
  cipher.finish();
  var encrypted = cipher.output;

  return Buffer.from(encrypted.getBytes(), "binary").toString("base64")
}

/**
 * Decrypt by 3DES using node-forge
 * @param input A base64 sring
 * @param key key is hashed by md5 and shorten to maximum 192 bits
 * @returns {String} A utf8 string
 */
function decrypt3DES(input, key) {
  let md5Key = forge.md.md5.create();
  md5Key.update(key);
  md5Key = md5Key.digest().toHex();
  const decipher = forge.cipher.createDecipher('3DES-ECB', md5Key.substring(0, 24));
  decipher.start();

  const inputEx = forge.util.createBuffer(Buffer.from(input, "base64").toString("binary"));
  decipher.update(inputEx);
  decipher.finish();
  const decrypted = decipher.output;
  return Buffer.from(decrypted.getBytes(), "binary").toString("utf8")
}