password_verify

(PHP 5 >= 5.5.0, PHP 7)

password_verifyパスワードがハッシュにマッチするかどうかを調べる

説明

boolean password_verify ( string $password , string $hash )

指定したハッシュがパスワードにマッチするかどうかを調べます。

password_hash() は、 アルゴリズムやコスト、ソルトといった情報もハッシュに含めて返すことに注意しましょう。 したがって、ハッシュの検証に必要な情報はすべてそこに含まれていることになります。 これで、検証関数がハッシュの検証をするときに、ソルトやアルゴリズム情報を別の場所から取得する必要がなくなります。

この関数は、タイミング攻撃に対して安全です。

パラメータ

password

ユーザーのパスワード。

hash

password_hash() が作ったハッシュ。

返り値

パスワードとハッシュがマッチする場合に TRUE、それ以外の場合に FALSE を返します。

例1 password_verify() の例

<?php
// これをどうやって作ったのかは、password_hash() の例を参照ください
$hash '$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq';

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

上の例の出力は以下となります。

Password is valid!

参考

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User Contributed Notes 6 notes

up
180
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', $hash)) {
    echo
'Password is valid!';
} else {
    echo
'Invalid password.';
}
?>
up
15
chris at weeone dot de
1 year ago
The function password_verify() uses constant time. This makes it safe against timing attacks. Don't use crypt($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
31
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
1
omidbahrami1990 at gmail dot com
10 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
2
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
-9
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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