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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Security; |
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/** |
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* PasswordHasher allows generating password hash and verifying passwords against a hash. |
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*/ |
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final class PasswordHasher |
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{ |
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private ?string $algorithm; |
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private array $parameters; |
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private const SAFE_PARAMETERS = [ |
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PASSWORD_BCRYPT => [ |
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'cost' => 13, |
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], |
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]; |
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/** |
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* @param string|null $algorithm Algorithm to use. If not specified, PHP chooses safest algorithm available in the |
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* current version of PHP. |
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* @param array|null $parameters Algorithm parameters. If not specified, safe defaults are used. |
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* @see https://www.php.net/manual/en/function.password-hash.php |
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*/ |
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public function __construct(?string $algorithm = PASSWORD_DEFAULT, array $parameters = null) |
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{ |
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$this->algorithm = $algorithm; |
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if ($parameters === null) { |
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$this->parameters = self::SAFE_PARAMETERS[$algorithm] ?? []; |
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} else { |
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$this->parameters = $parameters; |
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} |
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} |
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/** |
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* Generates a secure hash from a password and a random salt. |
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* |
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* The generated hash can be stored in database. |
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* Later when a password needs to be validated, the hash can be fetched and passed |
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* to {@see validate()}. For example, |
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* |
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* ```php |
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* // generates the hash (usually done during user registration or when the password is changed) |
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* $hash = (new PasswordHasher())->hash($password); |
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* // ...save $hash in database... |
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* |
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* // during login, validate if the password entered is correct using $hash fetched from database |
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* if ((new PasswordHasher())->validate($password, $hash)) { |
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* // password is good |
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* } else { |
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* // password is bad |
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* } |
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* ``` |
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* |
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* @param string $password The password to be hashed. |
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* @return string The password hash string. The output length might increase |
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* in future versions of PHP (http://php.net/manual/en/function.password-hash.php) |
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* @see validate() |
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*/ |
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public function hash(string $password): string |
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{ |
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$result = password_hash($password, $this->algorithm, $this->parameters); |
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if ($result === null) { |
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throw new \InvalidArgumentException('Algorithm "' . (string)$this->algorithm . '" is invalid.'); |
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} |
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if ($result === false) { |
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throw new \RuntimeException('Failed to hash password.'); |
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} |
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return $result; |
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} |
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/** |
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* Verifies a password against a hash. |
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* @param string $password The password to verify. |
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* @param string $hash The hash to verify the password against. |
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* @return bool whether the password is correct. |
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* @throws \InvalidArgumentException on bad password/hash parameters or if crypt() with Blowfish hash is not |
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* available. |
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* @see hash() |
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*/ |
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public function validate(string $password, string $hash): bool |
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{ |
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if ($password === '') { |
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throw new \InvalidArgumentException('Password must be a string and cannot be empty.'); |
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} |
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return password_verify($password, $hash); |
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} |
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} |
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yiisoft /
security
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