node-google-signature

Generate a HMAC-SHA1 signature for "Google Maps API for Business" in node.js

Generate a signature from a private key and a string:

 var signature = require('node-google-signature');

 var key    = '-2qtbstr8='       // safe for the web modified base64 format
 var string = '/maps/api/etc..'  // The URL string to sign

 signature.generate(key, string, function(hash){
        console.log(hash) // { signature : 'me50L1BneaefWlbvb_XpsaIclo' }
 })

URL Signing Debugger

https://m4b-url-signer.appspot.com/