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)
password_verify — Überprüft, ob ein Passwort und ein Hash zusammenpassen
Beschreibung
boolean password_verify
( string
$password
, string $hash
)Überprüft, ob ein Passwort und ein Hash zusammenpassen.
Beachte, dass password_hash() den Algorithmus, den Aufwand und den Salt als Teil des Hashes zurückgibt. Somit sind alle benötigten Informationen im Hash enthalten, was der Funktion erlaubt den Hash zu prüfen, ohne dass Informationen über den Salt oder den Algorithmus an anderer Stelle gespeichert werden müssen.
Parameter-Liste
-
password -
Das Passwort des Benutzers.
-
hash -
Ein Hash, der durch password_hash() erzeugt wurde.
Rückgabewerte
Gibt TRUE zurück, falls Password und Hash zusammenpassen, sonst FALSE.
Beispiele
Beispiel #1 password_verify()-Beispiel
<?php
// Siehe auch das password_hash() Beispiel in diesem Kontext
$hash = '$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq';
if (password_verify('rasmuslerdorf', $hash)) {
echo 'Valides Passwort!';
} else {
echo 'Invalides Passwort.';
}
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
Valides Passwort!
add a note
User Contributed Notes 5 notes
Anonymous ¶
3 years ago
chris at weeone dot de ¶
1 year ago
The function password_verify() uses constant time. This makes it safe against timing attacks. Don't use crypt($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.
Vasil Toshkov ¶
3 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!
?>
gorgonz at web dot de ¶
3 days 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)
suit at rebell dot at ¶
3 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.
