Javascript: Equivalent of PHP's hash_hmac() with RAW BINARY output?

Question

I am connecting to the Amazon Product Advertising API, and to sign my request I need to base64-encode the raw binary output of an HMAC-SHA256 hash.

In the PHP documentation for hash_hmac, the fourth parameter bool $raw_output controls whether the output is raw binary data (true) or lowercase hexits (false). My program works in PHP by simply setting that parameter to true.

However, I am now trying to port this over to Javascript. I tried using the CryptoJS.HmacSHA256() function, but it seems to be returning the lowercase hexits. How can I convert this to binary?

I have tried the following according to the CryptoJS documentation, but both outputs are identical:

var hash = CryptoJS.HmacSHA256("hello", "key");
console.log(hash.toString());
console.log(hash.toString(CryptoJS.enc.Base64));

Answer 1

This is explained in their documentation. Try this:

var hash = CryptoJS.HmacSHA256("Message", "Secret Passphrase");

var base64 = hash.toString(CryptoJS.enc.Base64);

You need to include http://crypto-js.googlecode.com/svn/tags/3.0.2/build/components/enc-base64-min.js for this. If you didn't include this, CryptoJS.enc.Base64 will be undefined and fallback to the default.

Working demo: http://jsfiddle.net/ak5Qm/

Answer 2

PHP:

base64_encode(hash_hmac('sha256', $value, $key, true));

Nodejs equivalent:

const crypto = require('crypto');
let token = crypto.createHmac("sha256", key).update(value).digest().toString('base64');