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 — Comprueba que la contraseña coincida con un hash
Descripción
Comprueba que el hash proporcionado coincida con la contraseña facilitada. password_verify() es compatible con crypt(). Por lo tanto, los hashes de contraseñas creados por crypt() pueden utilizarse con password_verify().
Observe que password_hash() devuelve el algoritmo, el coste y el salt como parte del hash devuelto. Por lo tanto, toda la información que es necesaria para verificar el hash está incluida. Esto permite a la función de verificación comprobar el hash sin la necesidad de almacenar por separado la información del salt o del algoritmo.
Esta función es segura contra ataques basado en tiempo.
Parámetros
-
password -
La contraseña del usuario.
-
hash -
Un hash creado por password_hash().
Valores devueltos
Devuelve true si la contraseña y el hash coinciden, o false de lo contrario.
Ejemplos
Ejemplo #1 Ejemplo de password_verify()
<?php
// Ver el ejemplo de password_hash() para ver de dónde viene este hash.
$hash = '$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq';
if (password_verify('rasmuslerdorf', $hash)) {
echo 'La contraseña es válida!';
} else {
echo 'La contraseña no es válida.';
}
?>El resultado del ejemplo sería:
¡La contraseña es válida!
Ver también
- password_hash() - Crea un hash de contraseña
- » implementación en el espacio de usuario
- 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 ¶
7 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.
