hash_equals() alternative for PHP 5.5.9

Question

My webhost doesn't allow usage of PHP 5.5.9 and I need to use the hash_equals() function.

Is there any alternative to this?

The user contributed note by asphp at dsgml dot com on the hash_equals() PHP Docs page provides code that can be used with earlier versions of PHP — Mark Baker
– Mark Baker, Commented Sep 19, 2015 at 18:44

Rizier123 · Accepted Answer · 2015-09-19 18:50:14Z

6

Maybe try:

if(!function_exists('hash_equals')) { function hash_equals($str1, $str2) { if(strlen($str1) != strlen($str2)) { return false; } else { $res = $str1 ^ $str2; $ret = 0; for($i = strlen($res) - 1; $i >= 0; $i--) $ret |= ord($res[$i]); return !$ret; } } }

Code from: asphp at dsgml dot com

Copied from the PHP comments.

edited Sep 19, 2015 at 18:50

Rizier123

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answered Sep 19, 2015 at 18:42

Max

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5 Comments

Rizier123 Over a year ago

Maybe you want to say from where you have this: php.net/manual/en/function.hash-equals.php#115635

Alexander O'Mara Over a year ago

Remember to cite where you copied the code from, unless you are the original author.

Max Over a year ago

Sure, sorry for that. I changed comment and added information where user can see original post.

DigiLive Over a year ago

@Erminesoft Shouldn't it be if(function_exists) (without !)? Seems to me now it says, if function hash_equals does not exists, do hash_equals, else...

ddofborg Over a year ago

The comment is removed from PHP site. Is the function actually correct?

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