AES-256-CBC example in Node.js using crypto module

aes-256-cbc-nodejs-crypto.md

AES-256-CBC example in Node.js using crypto module

'use strict';
const crypto = require('crypto');

// get password's md5 hash
let password = 'test';
let password_hash = crypto.createHash('md5').update(password, 'utf-8').digest('hex').toUpperCase();
console.log('key=', password_hash); // 098F6BCD4621D373CADE4E832627B4F6

// our data to encrypt
let data = '06401;0001001;04;15650.05;03';
console.log('data=', data);

// generate initialization vector
let iv = new Buffer.alloc(16); // fill with zeros
console.log('iv=', iv);

// encrypt data
let cipher = crypto.createCipheriv('aes-256-cbc', password_hash, iv);
let encryptedData = cipher.update(data, 'utf8', 'hex') + cipher.final('hex');
console.log('encrypted data=', encryptedData.toUpperCase());

Output:

key= 098F6BCD4621D373CADE4E832627B4F6
data= 06401;0001001;04;15650.05;03
iv= <Buffer 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00>
encrypted data= 67E5FA1AD27759C86EE86A86B9C97A7EAD12273A3DAAB5F408C5B04A1B979350

I'm encrypting my file on the command line using:

openssl aes-256-cbc -e -in test.env -out test.env.encrypted

and then trying to decrypt on node.js with:

crypto    = require('crypto')
algorithm = 'aes-256-cbc'
password  = 'test'

fs = require 'fs'
decrypt = (text) ->
  decipher = crypto.createDecipher(algorithm, password)
  dec = decipher.update(text, 'hex', 'utf8')
  dec += decipher.final('utf8')
  dec

file = fs.readFileSync './test.env.encrypted', 'utf-8'

console.log decrypt file

But i'm getting the following error:

TypeError: Bad input string at Decipher.update (crypto.js:168:26) at decrypt (/Users/h/tmp/encrypt_test/test.coffee:10:18) at Object.<anonymous> (/Users/h/tmp/encrypt_test/test.coffee:16:13) at Object.<anonymous> (/Users/h/tmp/encrypt_test/test.coffee:1:1) at Module._compile (module.js:569:30) at Object.CoffeeScript.run (/usr/local/lib/node_modules/coffeescript/lib/coffeescript/index.js:63:23) at compileScript (/usr/local/lib/node_modules/coffeescript/lib/coffeescript/command.js:265:29) at compilePath (/usr/local/lib/node_modules/coffeescript/lib/coffeescript/command.js:220:14) at Object.exports.run (/usr/local/lib/node_modules/coffeescript/lib/coffeescript/command.js:141:20) at Object.<anonymous> (/usr/local/lib/node_modules/coffeescript/bin/coffee:15:45) at Module._compile (module.js:569:30) at Object.Module._extensions..js (module.js:580:10) at Module.load (module.js:503:32) at tryModuleLoad (module.js:466:12) at Function.Module._load (module.js:458:3) at Function.Module.runMain (module.js:605:10) at startup (bootstrap_node.js:158:16) at bootstrap_node.js:575:3

Any ideas?

Where is your initialization vector?
I thought that CBC required it?
let cipher = crypto.createCipheriv('aes-256-cbc', password_hash, iv);

@KHerron it is indeed initialized:
let iv = new Buffer.alloc(16); // fill with zeros

@KHerron looks like he's using the DEPRECATED crypto.createDecipher rather than crypto.createDecipheriv.