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I'm trying to user CryptoJS under node to decrypt messages. I've got working Python code for decrypting the messages, but I need to run this under nodejs and would rather not call out to python for every message.

from Crypto.Cipher import AES
from Crypto import Random
import base64

encrypted='tBIFLLdvl/Bp8XAwXBYatbJSYkNTl9/dXkHZd4OjbZ0I9Jg6xrAx/bxuQHuZrNSzYZOBEKbyMlTTT8nQEDza8wQ22mrRaZlQqT3aWpdZe6aiWAEIvTHoQPglgVbz1HnYOHfZtGmu3a3cwfpFMK+ouczTWM545nWvG/I4zV4uFgna1rW9sznxumN/3RKSbC1USZ2TM9PrG967M5Mu+riQfh9i/yt6ubwj3kln2+C0WsRRr44ELyDKGdS69YExa535z42bfXTORjvaiMvizvkz55c343s0G4ziT6tLfDCGELsrAu/2NViKxJZZRg8Dmm0FnchB9OQ4ujVCBoDUXvfx3iHjzquC+OftbOovQUecoXb7UfuwIxMekgSJnonLC45S'
key = '22<\\09\\8e.==\\4#{{+!%i=]%Y/upi8!Z'
iv = '{+!%i=]%Y/upi8!Z'

cipher = AES.new(key, AES.MODE_CBC, iv)
print cipher.decrypt(base64.b64decode(encrypted))

This prints out my decrypted string from python. I'm sure my CryptoJS version is completely wrong at this point.

var node_cryptojs = require('node-cryptojs-aes');
var CryptoJS = node_cryptojs.CryptoJS;
var key = CryptoJS.enc.Latin1.parse('22<\\09\\8e.==\\4#{{+!%i=]%Y/upi8!Z');
var iv  = CryptoJS.enc.Latin1.parse('{+!%i=]%Y/upi8!Z');
var encrypted = 'tBIFLLdvl/Bp8XAwXBYatbJSYkNTl9/dXkHZd4OjbZ0I9Jg6xrAx/bxuQHuZrNSzYZOBEKbyMlTTT8nQEDza8wQ22mrRaZlQqT3aWpdZe6aiWAEIvTHoQPglgVbz1HnYOHfZtGmu3a3cwfpFMK+ouczTWM545nWvG/I4zV4uFgna1rW9sznxumN/3RKSbC1USZ2TM9PrG967M5Mu+riQfh9i/yt6ubwj3kln2+C0WsRRr44ELyDKGdS69YExa535z42bfXTORjvaiMvizvkz55c343s0G4ziT6tLfDCGELsrAu/2NViKxJZZRg8Dmm0FnchB9OQ4ujVCBoDUXvfx3iHjzquC+OftbOovQUecoXb7UfuwIxMekgSJnonLC45S';
var plaintextArray = CryptoJS.AES.decrypt({ ciphertext: encrypted }, key, { iv: iv } );
console.log(CryptoJS.enc.Latin1.stringify(plaintextArray));

All I get out of this version is a bunch of garbled text such as

{)¬L¶u[?®º[ «)þd0³(Á¨ÕßgÙä  Þ¨Þêâí99dáb*¦ÿßqf pr£Æ(> þ?C×$ÀM#<o¬_±À¥s=ê,)u<¯XÚîDÊP¢q|f̽^IiaJÂ__NîjbÉâïðp8å.º}ÜucósLÈqÁè&ô£LYLüâÙháë
Clive Cheshire
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    why are you doing the Latin1 stuff in the js? .... (sorry no idea about js in general) – Joran Beasley Feb 09 '15 at 19:56
  • You haven't shown us sample key, IV or ciphertexts. This is almost certainly an encoding issue and not just one. Latin1 seems out of place. `encrypted` is probably Base64 encoded, so it must be decoded before passing it into `decrypt`. – Artjom B. Feb 09 '15 at 20:14

1 Answers1

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Turns out I was one encoding away from correct. The Latin1 parses are correct. It was just the decode from base64 on the input that was missing. Must have missed that combination earlier.

var node_cryptojs = require('node-cryptojs-aes');
var CryptoJS = node_cryptojs.CryptoJS;
var key = CryptoJS.enc.Latin1.parse('22<\\09\\8e.==\\4#{{+!%i=]%Y/upi8!Z');
var iv  = CryptoJS.enc.Latin1.parse('{+!%i=]%Y/upi8!Z');
var encrypted = 'tBIFLLdvl/Bp8XAwXBYatbJSYkNTl9/dXkHZd4OjbZ0I9Jg6xrAx/bxuQHuZrNSzYZOBEKbyMlTTT8nQEDza8wQ22mrRaZlQqT3aWpdZe6aiWAEIvTHoQPglgVbz1HnYOHfZtGmu3a3cwfpFMK+ouczTWM545nWvG/I4zV4uFgna1rW9sznxumN/3RKSbC1USZ2TM9PrG967M5Mu+riQfh9i/yt6ubwj3kln2+C0WsRRr44ELyDKGdS69YExa535z42bfXTORjvaiMvizvkz55c343s0G4ziT6tLfDCGELsrAu/2NViKxJZZRg8Dmm0FnchB9OQ4ujVCBoDUXvfx3iHjzquC+OftbOovQUecoXb7UfuwIxMekgSJnonLC45S';
var plaintextArray = CryptoJS.AES.decrypt({ ciphertext: CryptoJS.enc.Base64.parse(encrypted) }, key, { iv: iv } );
console.log(CryptoJS.enc.Latin1.stringify(plaintextArray));
Clive Cheshire
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