core-bundle/src/Resources/contao/forms/FormCaptcha.php
protected function generateHashes($sum)
	{
		// Round the time to 30 minutes
		$time = (int) round(time() / 60 / 30);

		return array_map(
			function ($hashTime) use ($sum)
			{
				return hash_hmac('sha256', $sum . "\0" . $hashTime, System::getContainer()->getParameter('kernel.secret'));
			},
			array($time, $time - 1)
		);
	}
protected function generateHashes($sum)
	{
		// Round the time to 30 minutes
		$time = (int) round(time() / 60 / 30);

		return array_map(
			function ($hashTime) use ($sum)
			{
				return hash_hmac('sha256', $sum . "\0" . $hashTime, System::getContainer()->getParameter('kernel.secret'));
			},
			array($time, $time - 1)
		);
	}
protected function generateHashes ( $ sum ) { // Round the time to 30 minutes $ time = ( int ) round ( time ( ) / 60 / 30 ) ; return array_map ( function ( $ hashTime ) use ( $ sum ) { return hash_hmac ( 'sha256' , $ sum . "\0" . $ hashTime , System :: getContainer ( ) -> getParameter ( 'kernel.secret' ) ) ; } , array ( $ time , $ time - 1 ) ) ; }
Generate hashes for the current time and the specified sum

@param integer $sum

@return array
Generate hashes for the current time and the specified sum