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vendor/symfony/password-hasher/Hasher/Pbkdf2PasswordHasher.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\PasswordHasher\Hasher;
+
+use Symfony\Component\PasswordHasher\Exception\InvalidPasswordException;
+use Symfony\Component\PasswordHasher\Exception\LogicException;
+use Symfony\Component\PasswordHasher\LegacyPasswordHasherInterface;
+
+/**
+ * Pbkdf2PasswordHasher uses the PBKDF2 (Password-Based Key Derivation Function 2).
+ *
+ * Providing a high level of Cryptographic security,
+ *  PBKDF2 is recommended by the National Institute of Standards and Technology (NIST).
+ *
+ * But also warrants a warning, using PBKDF2 (with a high number of iterations) slows down the process.
+ * PBKDF2 should be used with caution and care.
+ *
+ * @author Sebastiaan Stok <s.stok@rollerscapes.net>
+ * @author Andrew Johnson
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+final class Pbkdf2PasswordHasher implements LegacyPasswordHasherInterface
+{
+    use CheckPasswordLengthTrait;
+
+    private $algorithm;
+    private $encodeHashAsBase64;
+    private $iterations = 1;
+    private $length;
+    private $encodedLength = -1;
+
+    /**
+     * @param string $algorithm          The digest algorithm to use
+     * @param bool   $encodeHashAsBase64 Whether to base64 encode the password hash
+     * @param int    $iterations         The number of iterations to use to stretch the password hash
+     * @param int    $length             Length of derived key to create
+     */
+    public function __construct(string $algorithm = 'sha512', bool $encodeHashAsBase64 = true, int $iterations = 1000, int $length = 40)
+    {
+        $this->algorithm = $algorithm;
+        $this->encodeHashAsBase64 = $encodeHashAsBase64;
+        $this->length = $length;
+
+        try {
+            $this->encodedLength = \strlen($this->hash('', 'salt'));
+        } catch (\LogicException $e) {
+            // ignore unsupported algorithm
+        }
+
+        $this->iterations = $iterations;
+    }
+
+    public function hash(string $plainPassword, string $salt = null): string
+    {
+        if ($this->isPasswordTooLong($plainPassword)) {
+            throw new InvalidPasswordException();
+        }
+
+        if (!\in_array($this->algorithm, hash_algos(), true)) {
+            throw new LogicException(sprintf('The algorithm "%s" is not supported.', $this->algorithm));
+        }
+
+        $digest = hash_pbkdf2($this->algorithm, $plainPassword, $salt, $this->iterations, $this->length, true);
+
+        return $this->encodeHashAsBase64 ? base64_encode($digest) : bin2hex($digest);
+    }
+
+    public function verify(string $hashedPassword, string $plainPassword, string $salt = null): bool
+    {
+        if (\strlen($hashedPassword) !== $this->encodedLength || false !== strpos($hashedPassword, '$')) {
+            return false;
+        }
+
+        return !$this->isPasswordTooLong($plainPassword) && hash_equals($hashedPassword, $this->hash($plainPassword, $salt));
+    }
+
+    public function needsRehash(string $hashedPassword): bool
+    {
+        return false;
+    }
+}