owncloud / core

	 * @param RSA $privateKey

	 * @throws \Exception

	 */

	public function writeAppSignature($path,

									  X509 $certificate,

									  RSA $privateKey) {

		$appInfoDir = $path . '/appinfo';

		$this->fileAccessHelper->assertDirectoryExists($path);

		$this->fileAccessHelper->assertDirectoryExists($appInfoDir);

		$iterator = $this->getFolderIterator($path);

		$hashes = $this->generateHashes($iterator, $path);

		$signature = $this->createSignatureData($hashes, $certificate, $privateKey);

		try {

			$this->fileAccessHelper->file_put_contents(

				$appInfoDir . '/signature.json',

				json_encode($signature, JSON_PRETTY_PRINT)

			);

		} catch (\Exception $e){

			if (!$this->fileAccessHelper->is_writeable($appInfoDir)){

				throw new \Exception($appInfoDir . ' is not writable');

			}

			throw $e;

		}

	}

	/**

	 * Write the signature of core

	 * @param string $path

	 * @throws \Exception

	 */

	public function writeCoreSignature(X509 $certificate,

									   RSA $rsa,

									   $path) {

		$coreDir = $path . '/core';

		$this->fileAccessHelper->assertDirectoryExists($path);

		$this->fileAccessHelper->assertDirectoryExists($coreDir);

		$iterator = $this->getFolderIterator($path, $path);

		$hashes = $this->generateHashes($iterator, $path);

		$signatureData = $this->createSignatureData($hashes, $certificate, $rsa);

		try {

			$this->fileAccessHelper->file_put_contents(

				$coreDir . '/signature.json',

				json_encode($signatureData, JSON_PRETTY_PRINT)

			);

		} catch (\Exception $e){

			if (!$this->fileAccessHelper->is_writeable($coreDir)){

				throw new \Exception($coreDir . ' is not writable');

			}

			throw $e;

		}

	}

	/**

	 * Verifies the signature for the specified path.