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.';
}
?>
password_verify
(PHP 5 >= 5.5.0, PHP 7, PHP 8)
password_verify — Vérifie qu'un mot de passe correspond à un hachage
Description
Vérifie que le hachage fourni correspond bien au mot de passe fourni. La fonction password_verify() est compatible avec la fonction crypt(). Ainsi, un mot de passe haché par la fonction crypt() peut être utilisé avec la fonction password_verify().
Notez que la fonction password_hash() retourne l'algorithme, le "cost", et le salt comme parties du hachage retourné. Toutefois, toutes les informations nécessaires pour vérifier le hachage y sont incluses. Ceci permet à la fonction de vérifier le hachage sans avoir besoin d'un stockage séparé pour les informations concernant l'algorithme et le salt.
Cette fonction est sans danger contre les attaques sur le temps.
Liste de paramètres
-
password -
Le mot de passe utilisateur.
-
hash -
Un hachage créé par la fonction password_hash().
Valeurs de retour
Retourne true si le mot de passe et le hachage correspondent,
ou false sinon.
Exemples
Exemple #1 Exemple avec password_verify()
Ceci est un exemple simplifié ; il est recommandé de ré-hacher un mot de passe correct si nécessaire ; voir la fonction password_needs_rehash() pour un exemple.
<?php
// Voir l'exemple fourni sur la page de la fonction password_hash()
// pour savoir d'où cela provient.
$hash = '$2y$10$.vGA1O9wmRjrwAVXD98HNOgsNpDczlqm3Jq7KnEd1rVAGv3Fykk1a';
if (password_verify('rasmuslerdorf', $hash)) {
echo 'Le mot de passe est valide !';
} else {
echo 'Le mot de passe est invalide.';
}
?>L'exemple ci-dessus va afficher :
Le mot de passe est valide !
Voir aussi
- password_needs_rehash() - Vérifie que le hachage fourni est conforme à l'algorithme et aux options spécifiées
- password_hash() - Crée une clé de hachage pour un mot de passe
- » l'implémentation en espace utilisateur
- sodium_crypto_pwhash_str_verify() - Verifies that a password matches a hash
add a note
User Contributed Notes 5 notes
Anonymous ¶
10 years ago
Vasil Toshkov ¶
11 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', $hash)) {
echo 'Password is valid!';
} else {
echo 'Invalid password.';
}
// Output: Password is valid!
?>
chris at weeone dot de ¶
8 years ago
The function password_verify() uses constant time. This makes it safe against timing attacks. Don't use crypt($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.
omidbahrami1990 at gmail dot com ¶
6 years 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
?>
suit at rebell dot at ¶
11 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.
