HMAC SHA1 for Amazon S3

Demonstrates the HMAC SHA1 computation required by the Amazon S3 web service.

Download Chilkat Crypt ActiveX

<?php

//  This example uses sample data from:
//  http://docs.amazonwebservices.com/AmazonS3/2006-03-01/RESTAuthentication.html
$strToSign = 'GET' . "\n" . "\n" . "\n" . 'Tue, 27 Mar 2007 19:36:42 +0000' . "\n" . '/johnsmith/photos/puppy.jpg';

$crypt = new COM("Chilkat.Crypt2");

$success = $crypt->UnlockComponent('Anything for 30-day trial.');
if ($success != true) {
    //  Unlock Failed.
    print $crypt->lastErrorText() . "\n";
    exit;
}

//  We want SHA1 for the HMAC hash algorithm:
$crypt->HashAlgorithm = 'sha1';

$AWSAccessKeyId = '0PN5J17HBGZHT7JJ3X82';
$AWSSecretAccessKey = 'uV3F3YluFJax1cknvbcGwgjvx4QpvB+leU8dUj2o';

//  Set the HMAC secret key:
$crypt->SetHmacKeyString($AWSSecretAccessKey);

//  By setting the charset = "utf-8", the string will be converted
//  to utf-8 (internal to the Chilkat component) prior to signing:
$crypt->Charset = 'utf-8';

//  Indicate that Base64 output is desired:
$crypt->EncodingMode = 'base64';

$signature = $crypt->hmacStringENC($strToSign);
print $crypt->lastErrorText() . "\n";

//  Display the signature as part of the HTTP Authorization header:
print 'Authorization: AWS ' . $AWSAccessKeyId
     . ':' . $signature . "\n";

print 'Expected:      AWS 0PN5J17HBGZHT7JJ3X82:xXjDGYUmKxnwqr5KXNPGldn5LbA=' . "\n";
?>