password_verify

(PHP 5 >= 5.5.0, PHP 7)

password_verifyVerifica se um password corresponde com um hash

Descrição

boolean password_verify ( string $password , string $hash )

Verifica se o hash fornecido corresponde com o password fornecido.

Perceba que password_hash() retorna o algoritmo, custo e o salt como parte do hash retornado. Por isso, toda a informação necessária para verificar o hash está incluída nele. Isso permite que a função de verificação faça isso sem precisar de um armazenamento separado para a informação do salt ou do algoritmo.

Esta função é segura contra "timing attacks".

Parâmetros

password

A senha do usuário.

hash

Um hash criado por password_hash().

Valor Retornado

Retorna TRUE se o password e o hash corresponderem, ou FALSE caso contrário.

Exemplos

Exemplo #1 Exemplo de password_verify()

<?php
// See the password_hash() example to see where this came from.
$hash '$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq';

if (
password_verify('rasmuslerdorf'$hash)) {
    echo 
'Password is valid!';
} else {
    echo 
'Invalid password.';
}
?>

O exemplo acima irá imprimir:

Password is valid!

Veja Também

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User Contributed Notes 6 notes

up
178
Anonymous
3 years ago
If you get incorrect false responses from password_verify when manually including the hash variable (eg. for testing) and you know it should be correct, make sure you are enclosing the hash variable in single quotes (') and not double quotes (").

PHP parses anything that starts with a $ inside double quotes as a variable:

<?php
// this will result in 'Invalid Password' as the hash is parsed into 3 variables of
// $2y, $07 and $BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq
// due to it being enclosed inside double quotes
$hash = "$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq";

// this will result in 'Password is valid' as variables are not parsed inside single quotes
$hash = '$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq';

if (
password_verify('rasmuslerdorf', $hash)) {
    echo
'Password is valid!';
} else {
    echo
'Invalid password.';
}
?>
up
13
chris at weeone dot de
1 year ago
The function password_verify() uses constant time. This makes it safe against timing attacks. Don't use crypt($password_database) === crypt($password_given_by_login), since there is no protection against timing attacks!

If you don't want to use password_verify(), then have a look at hash_equals(), which also runs a timing attack safe string comparison.
up
30
Vasil Toshkov
4 years ago
This function can be used to verify hashes created with other functions like crypt(). For example:

<?php

$hash
= '$1$toHVx1uW$KIvW9yGZZSU/1YOidHeqJ/';

if (
password_verify('rasmuslerdorf', $hash)) {
    echo
'Password is valid!';
} else {
    echo
'Invalid password.';
}

// Output: Password is valid!

?>
up
3
suit at rebell dot at
4 years ago
As Vasil Toshkov stated, password_verify() can be used to verify a password created by crypt() or password_hash()

That is because passwords created by password_hash() also use the C crypt sheme

If you want to verify older plain MD5-Hashes you just need to prefix them with $1$

See https://en.wikipedia.org/wiki/Crypt_(C) for more information.
up
0
omidbahrami1990 at gmail dot com
7 days ago
This Is The Most Secure Way To Keep Your Password Safe With PHP 7 ,
Even When Your DataBase Has Been Hacked ,
It Will Be Almost Impossible To Retrieve Your Password .
--------------------------------------------------------
--- When A User Wants To Sign Up ---
1 ---> Get Input From User Which Is The User`s Password
1 ---> Hash The Password
2 ---> Store The Hashed Password In Your DataBase
--------------------------------------------------------
<?php
$hashed_password
= password_hash($_POST["password"],PASSWORD_DEFAULT);

// $_POST["password"] ---> Is The User`s Input
// $hashed_password ---> Is The Hashed Password You Can Store In Your DataBase
?>
--------------------------------------------------------
--- When A User Wants To Sign In ---
1 ---> Get Input From User Which Is The User`s Password
2 ---> Fetch The Hashed Password From Your Database
3 ---> Compare The User`s Input And The Hashed Password
--------------------------------------------------------
<?php
   
if(password_verify($_POST["password"],$hashed_password))
    echo
"Welcome";

    else
    echo
"Wrong Password";

// $_POST["password"] ---> Is The User`s Input
// $hashed_password ---> Is The Hashed Password You Have Fetched From DataBase
?>
up
-8
gorgonz at web dot de
2 months ago
just the correct link to the wikipedia, seen in the note of "suit at rebell dot at":

https://en.wikipedia.org/wiki/Crypt_(C)
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