Memory leak

[gwynnarth]

Hi,

When doing some performance comparisons I noticed that you extension increasingly consumes more memory with each iteration.

A simple test script:

<?php

for ($i = 0; $i < 10000000; $i++) {
	sha3(rand(), 256);
	if ($i % 1000 === 0) {
		echo memory_get_usage()/1048576 . " MB\n";
	}
}

Produces output as in the attached file: sha3mem.txt

Plotting it reveals that the increase is perfectly linear which indeed suggests a memory leak.

In contrast, when using sha1() hashing method the memory consumption remains constant.
Could you please take a look?

PHP 5.6.27 (cli) (built: Oct 17 2016 01:26:56)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

Thanks,
Artur.

[ghost]

I can confirm this running

PHP 7.1.6-2 (cli) (built: Jun 14 2017 05:31:31) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.1.6-2, Copyright (c) 1999-2017, by Zend Technologies

Output file sha3-memory-leak.log