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Created September 24, 2014 15:32
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Generate HMAC in NodeJS
var crypto = require('crypto');
var SHARED_SECRET = "sup3rs3cr3t!!";
function signString(string_to_sign, shared_secret) {
var hmac = crypto.createHmac('sha512', shared_secret);
var payload = {
'name': 'joe smith',
'category': 'people',
'action': 'transport',
'where': 'pluto',
'timestamp': Math.round(new Date().getTime()/1000)
var json_payload = JSON.stringify(payload);
var signature = signString(json_payload, SHARED_SECRET);
var encoded_json = new Buffer(json_payload).toString('base64');
var encoded_signature = new Buffer(signature).toString('base64');
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