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 — Verifica se uma senha corresponde a um hash
Descrição
Verifica se o hash fornecido corresponde à senha informada password_verify() é compatível com crypt(). Portanto, hashes de senha criadas por crypt() podem ser usados com password_verify().
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 ataques de sincronismo.
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()
Este é um exemplo simplificado; é recomendável recalcular o hash de uma senha correta se necessário; consulte a página da função password_needs_rehash() para um exemplo.
<?php
// Veja o exemplo de password_hash() para ver de onde veio esta string.
$hash = '$2y$10$.vGA1O9wmRjrwAVXD98HNOgsNpDczlqm3Jq7KnEd1rVAGv3Fykk1a';
if (password_verify('rasmuslerdorf', $hash)) {
echo 'Senha válida!';
} else {
echo 'Senha inválida';
}
?>O exemplo acima produzirá:
Senha válida!
Veja Também
- password_needs_rehash() - Verifica se o hash informado corresponde às opções especificadas
- password_hash() - Cria um hash de senha
- » implementação no espaço de usuário
- sodium_crypto_pwhash_str_verify() - Verifies that a password matches a hash
add a note
User Contributed Notes 5 notes
Anonymous ¶
9 years ago
Vasil Toshkov ¶
10 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 ¶
10 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.
