CODEWITHSUNDEEP
php
Jacky Shek
Jacky Shek

Reputation: 955

BCrypt of PHP cannot verify the password

I have tested the password_verify of PHP that does not verify correctly. I am using centOS and PHP version 5.3.3. I know the 5.3.3 version of PHP does not provide the password_hash function, so i have used the https://github.com/ircmaxell/password_compat

However, it is always to return true with different passwords when i verify it. Is my code has bug?

Here is my code:

    $password = 'k32AlGOPqvCzoh*Sp(Hdrr26]M=lQb00R&W=hew|-|([(03vp==A8%m?l=eA2^bs_|\qVV3WZ';

    $verify_pw = 'k32AlGOPqvCzoh*Sp(Hdrr26]M=lQb00R&W=hew|-|([(03vp==A8%m?l=eA2^bs_|\qVV3WZasdasdasdasdqweqa13123';

    $options = array(
                'cost' => 15
            );

    $hash = password_hash($password, PASSWORD_BCRYPT,$options);

    var_dump(password_verify($verify_pw ,$hash)); // always true

Upvotes: 0

Views: 174

Answers (1)

ins0
ins0

Reputation: 3928

The problem is not your code. Bcrypt has a string limit from 56 bytes e.g. 55 Chars

https://www.usenix.org/legacy/events/usenix99/provos/provos_html/node4.html

the key argument is a secret encryption key, which can be a user-chosen password of up to 56 bytes (including a terminating zero byte when the key is an ASCII string).

So your string gets truncated and is the reason why your password_verify returns allways true as the truncated strings are identical.

Upvotes: 2

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