public function getSignatureContent(\TYPO3\Flow\Http\Request $httpRequest) {
		$date = $httpRequest->getHeader('Date');
		$dateValue = $date instanceof \DateTime ? $date->format(DATE_RFC2822) : '';
		$signData = $httpRequest->getMethod() . chr(10)
			. sha1($httpRequest->getContent()) . chr(10)
			. $httpRequest->getHeader('Content-Type') . chr(10)
			. $dateValue . chr(10)
			. $httpRequest->getUri();
		return $signData;
	}