S3 List Objects request on a bucket to get additional keys (> 1000)

By default, an S3 List Objects (Get Bucket) request returns 1000 keys. According to S3 documentation, if I want to list more objects, then I have to pass a marker query string along with my request with the value of the marker set to be the last key from the pr开发者_运维问答evious list of objects.

For some reason this doesn't work for me ... I seem to be missing something obvious and I'm trying to find out what.

This is what the REST request is supposed to look like:

GET ?marker=LAST-KEY HTTP/1.1
Host: quotes.s3.amazonaws.com
Date: Wed, 01 Mar  2009 12:00:00 GMT
Authorization: AWS ACCESS_KEY_ID:SIGNATURE

My PHP code looks something like this:

...
// this is where I'm getting the value of the last key
$marker=$arrObjects["Contents"][999]["Key"];
...
//this is where I'm signing my request
$canonicalizedResources = "/".$bucketName."/".(($marker=="")?"":"?marker=".rawurlencode($marker));
// $contentMD5 and $contentType are both empty strings ""
$stringToSign = utf8_encode("GET"."\n".$contentMD5."\n".$contentType."\n".$timestamp."\n".$canonicalizedAmzHeaders.$canonicalizedResources);
$signature = base64_encode(hash_hmac("sha1",$stringToSign,$customerSecretKey,true));
...

This code works perfectly if I'm listing the objects in a bucket which number less than 1000. But whenever I pass a marker to the request, I get a "Signature Does Not Match" error.

Anyone know where I'm going wrong?

To follow up on @Skyler's comment, using the SDK your code could look like this (minus the authorization bits):

// Instantiate the class
$s3 = new AmazonS3();

$response = $s3->list_objects('my-bucket');

More in the AWS docs.