<ds:Object Id="ts-text">
    Wed Jun  4 12:11:06 EDT
</ds:Object>

<ds:Reference URI="#ts-text">
    <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
    <ds:DigestValue>pN3j2OeC0+/kCatpvy1dYfG1g68=</ds:DigestValue>
</ds:Reference>

<?php
$digest = base64_encode(hash('SHA1', $contents, true));

public function testCreateDigest(DOMDocument $request, $expectedDigest) {

    $ns = $request->documentElement->namespaceURI;
    $body = $request
            ->getElementsByTagNameNS($ns, 'Body')
            ->item(0);

    $firstElement = '';
    foreach($body->childNodes as $node){
        if ($node->nodeType === XML_ELEMENT_NODE) {
            $firstElement = $node;
            break;
        }
    }


    $content = $firstElement->C14N(false, true);


    $actualDigest = base64_encode(hash('SHA1', $content, true));

    $this->assertEquals($expectedDigest, $actualDigest);

}

public function testCreateDigest(DOMDocument $request, $expectedDigest) {

    $ns = $request->documentElement->namespaceURI;
    $body = $request
        ->getElementsByTagNameNS($ns, 'Body')
        ->item(0);

    $content = $body->C14N(true, true); // <-- exclusive, with comments

    $actualDigest = base64_encode(hash('SHA1', $content, true));

    $this->assertEquals($expectedDigest, $actualDigest);

}