MD5 is passing checks

Question

MD5 is passing checks

Asked 9 years, 2 months ago

Viewed 91 times

1

I have a problem when I use MD5 in my passwords, I have verification:

if(empty($regPassword)){
    exit('<div class="alert alert-danger margin-top15">&raquo; A <b>senha</b> é necessária e não pode ser vazia.</div>');
}

if(empty($regConfirmpass)){
    exit('<div class="alert alert-danger margin-top15">&raquo; <b>Confirmar a senha</b> é necessário e não pode ser vazio.</div>');        
}

When I use this in my variable:

$regPassword        = trim(strip_tags(md5($_POST['regPassword'])));
$regConfirmpass     = trim(strip_tags(md5($_POST['regConfirmpass'])));

The check doesn’t work someone knows why?

Complete code in: Here

1

Doesn’t work like? Here it worked by putting the same password.

– Rafael Almeida

2015/04/28 at 20:13
It does not work to check if the user leaves the registration empty password field anyway.

– Gabriel

2015/04/28 at 20:14
1

It turns out that the function md5 will generate a hash in the same way, however it is a hash of an empty string.

– Paulo Rodrigues

2015/04/28 at 20:16
2

trim and strip_tags are unnecessary in your code because the md5 will not return white spaces or tags

– Lucas

2015/04/28 at 20:19
I withdrew and even so continues registering even leaving the input empty password, removed the md5 and the check worked, This weird I want it to work with MD5

– Gabriel

2015/04/28 at 20:22
You are checking before or after applying md5?

– Oeslei

2015/04/28 at 20:23
After applying md5 in the method $_POST

– Gabriel

2015/04/28 at 20:24

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1 answer

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by KaduAmaral • **11,472** points · Answer 1 · 2015-04-28T20:25:14+00:00

The function md5 generates a HASH, This is done with mathematical calculations on top of the string past. In case is generating a HASH and checking if it’s empty, sort of like this:

// md5('') == d41d8cd98f00b204e9800998ecf8427e (string)
if(empty('d41d8cd98f00b204e9800998ecf8427e')){

You need to check the user-informed variable:

if(empty($_POST['regPassword'])){
    exit('<div class="alert alert-danger margin-top15">&raquo; A <b>senha</b> é necessária e não pode ser vazia.</div>');
}

if(empty($_POST['regConfirmpass'])){
    exit('<div class="alert alert-danger margin-top15">&raquo; <b>Confirmar a senha</b> é necessário e não pode ser vazio.</div>');        
}