(PHP ActiveX) URL Signing for Google Maps API

Demonstrates how to sign a URL for the Google Maps API.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2')
$crypt = new COM("Chilkat.Crypt2");

// The output will be modified Base64.
// Modified Base64 for URLs replaces the '+' and '/' characters 
// of standard Base64 with '-' and '_' respectively, so that these 
// Base64 signatures no longer need to be URL-encoded.
$crypt->EncodingMode = 'modBase64';

// Set the hash algorithm to sha-1
$crypt->HashAlgorithm = 'sha-1';

// Set the HMAC key (this is the private key provided by Google)
$crypt->SetHmacKeyEncoded('vNIXE0xscrmjlyV-12Nj_BvUPaw=','modBase64');

// Compute the URL signature
$sig = $crypt->hmacStringENC('/maps/api/geocode/json?address=New+York&sensor=false&client=clientID');

// The result should be KrU1TzVQM7Ur0i8i7K3huiw3MsA=
print $sig . "\n";

?>