Some examples of generating HMACs (SHA256)

README.md

Blog 2019/2/1

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Generating HMACs in Python, Node, and PHP

HMACs came up in a discussion at work so I threw together a few quick demos of how to generate them using the built-in API's of a few langs.

demo.js

var crypto = require("crypto");
var message = "a message which needs an hmac";
var key = "keyser soze";
var hmac_hex = crypto.createHmac("sha256", key).update(message).digest("hex");
console.log(hmac_hex);

demo.php

<?
$message = "a message which needs an hmac";
$key = "keyser soze";
$hmac_hex = hash_hmac("sha256", $message, $key);
print_r($hmac_hex);
?>

demo.py

#!/usr/bin/env python

import hmac
import hashlib

message = "a message which needs an hmac"
key = "keyser soze"
hmac_hex = hmac.new(key, message, hashlib.sha256).hexdigest()
print hmac_hex

output.txt

$ ./run.sh 
f42febfb52f8d2853452b1c835947d70b3e92b1da5ba0c9568b50e531b88bc5b
f42febfb52f8d2853452b1c835947d70b3e92b1da5ba0c9568b50e531b88bc5b
f42febfb52f8d2853452b1c835947d70b3e92b1da5ba0c9568b50e531b88bc5b

run.sh

#!/bin/sh

set -e
node demo.js
php demo.php
python demo.py