/**
* Sign the document.
*
* @param DOMElement $signature Signature element to sign
* @param Key $keyForSignature Key used to sign data
* @param string $canonicalizationAlgorithm Canonicalization algorithm
*
* @return DOMElement
*/
public static function signDocument(DOMElement $signature, Key $keyForSignature, $canonicalizationAlgorithm)
{
$doc = $signature->ownerDocument;
$signedInfo = $signature->getElementsByTagNameNS(self::NS_XMLDSIG, 'SignedInfo')->item(0);
if (!is_null($signedInfo)) {
$canonicalizedData = self::canonicalizeData($signedInfo, $canonicalizationAlgorithm);
$signatureValueString = base64_encode($keyForSignature->signData($canonicalizedData));
$signatureValue = $doc->createElementNS(self::NS_XMLDSIG, self::PFX_XMLDSIG . ':SignatureValue', $signatureValueString);
$keyInfo = $signature->getElementsByTagNameNS(self::NS_XMLDSIG, 'KeyInfo')->item(0);
$signature->insertBefore($signatureValue, $keyInfo);
}
return $signatureValue;
}
