99 lines
3.1 KiB
PHP
99 lines
3.1 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\PasswordHasher\Hasher;
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use Symfony\Component\PasswordHasher\Exception\InvalidPasswordException;
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use Symfony\Component\PasswordHasher\Exception\LogicException;
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use Symfony\Component\PasswordHasher\LegacyPasswordHasherInterface;
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/**
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* MessageDigestPasswordHasher uses a message digest algorithm.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class MessageDigestPasswordHasher implements LegacyPasswordHasherInterface
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{
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use CheckPasswordLengthTrait;
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private $algorithm;
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private $encodeHashAsBase64;
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private $iterations = 1;
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private $hashLength = -1;
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/**
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* @param string $algorithm The digest algorithm to use
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* @param bool $encodeHashAsBase64 Whether to base64 encode the password hash
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* @param int $iterations The number of iterations to use to stretch the password hash
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*/
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public function __construct(string $algorithm = 'sha512', bool $encodeHashAsBase64 = true, int $iterations = 5000)
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{
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$this->algorithm = $algorithm;
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$this->encodeHashAsBase64 = $encodeHashAsBase64;
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try {
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$this->hashLength = \strlen($this->hash('', 'salt'));
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} catch (\LogicException $e) {
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// ignore algorithm not supported
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}
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$this->iterations = $iterations;
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}
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public function hash(string $plainPassword, string $salt = null): string
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{
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if ($this->isPasswordTooLong($plainPassword)) {
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throw new InvalidPasswordException();
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}
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if (!\in_array($this->algorithm, hash_algos(), true)) {
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throw new LogicException(sprintf('The algorithm "%s" is not supported.', $this->algorithm));
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}
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$salted = $this->mergePasswordAndSalt($plainPassword, $salt);
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$digest = hash($this->algorithm, $salted, true);
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// "stretch" hash
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for ($i = 1; $i < $this->iterations; ++$i) {
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$digest = hash($this->algorithm, $digest.$salted, true);
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}
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return $this->encodeHashAsBase64 ? base64_encode($digest) : bin2hex($digest);
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}
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public function verify(string $hashedPassword, string $plainPassword, string $salt = null): bool
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{
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if (\strlen($hashedPassword) !== $this->hashLength || false !== strpos($hashedPassword, '$')) {
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return false;
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}
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return !$this->isPasswordTooLong($plainPassword) && hash_equals($hashedPassword, $this->hash($plainPassword, $salt));
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}
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public function needsRehash(string $hashedPassword): bool
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{
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return false;
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}
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private function mergePasswordAndSalt(string $password, ?string $salt): string
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{
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if (!$salt) {
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return $password;
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}
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if (false !== strrpos($salt, '{') || false !== strrpos($salt, '}')) {
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throw new \InvalidArgumentException('Cannot use { or } in salt.');
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}
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return $password.'{'.$salt.'}';
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}
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}
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