I had problems with my signature validations by the prefix "ds", so I made 
changes to indicate whether the firm is required prefix or not.


Attachment changes made.


require(dirname(__FILE__) . '/../xmlseclibs.php');

if (file_exists(dirname(__FILE__) . '/sign-basic-test.xml')) {
    unlink(dirname(__FILE__) . '/sign-basic-test.xml');
}

$doc = new DOMDocument(); 
$doc->formatOutput = FALSE; 
$doc->preserveWhiteSpace = TRUE;

$semilla = getSeed();
$xml = 
"<getToken>\n\t<item>\n\t\t<Semilla>$semilla</Semilla>\n\t</item>\n</getToken>";

$doc->loadXML($xml);
$objDSig = new XMLSecurityDSig(FALSE);
//die;
$objDSig->setCanonicalMethod(XMLSecurityDSig::C14N);
$options['prefix'] = '';
$options['prefix_ns'] = '';
$options['force_uri'] = TRUE;
$options['id_name'] = 'ID';
$objDSig->addReference($doc, XMLSecurityDSig::SHA1, 
array(XMLSecurityDSig::TR_ENV_SIG), $options);

$objKey = new XMLSecurityKey(XMLSecurityKey::RSA_SHA1, 
array('type'=>'private'));
$pfx = file_get_contents(dirname(__FILE__) . "/file.pfx");
openssl_pkcs12_read($pfx, $key, "pass");
$objKey->loadKey($key["pkey"]);
$objDSig->add509Cert($key["cert"]);
$objDSig->sign($objKey, $doc->documentElement);

$doc->save(dirname(__FILE__) . '/sign-basic-test.xml');