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msd2/phpBB3/phpbb/passwords/driver/bcrypt.php

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+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\passwords\driver;
+
+class bcrypt extends base
+{
+	const PREFIX = '$2a$';
+
+	/** @var int Hashing cost factor */
+	protected $cost_factor;
+
+	/**
+	 * Constructor of passwords driver object
+	 *
+	 * @param \phpbb\config\config $config phpBB config
+	 * @param \phpbb\passwords\driver\helper $helper Password driver helper
+	 * @param int $cost_factor Hashing cost factor (optional)
+	 */
+	public function __construct(\phpbb\config\config $config, helper $helper, $cost_factor = 10)
+	{
+		parent::__construct($config, $helper);
+
+		// Don't allow cost factor to be below default setting
+		$this->cost_factor = max(10, $cost_factor);
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function get_prefix()
+	{
+		return self::PREFIX;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function needs_rehash($hash)
+	{
+		preg_match('/^' . preg_quote($this->get_prefix()) . '([0-9]+)\$/', $hash, $matches);
+
+		list(, $cost_factor) = $matches;
+
+		return empty($cost_factor) || $this->cost_factor !== intval($cost_factor);
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function hash($password, $salt = '')
+	{
+		// The 2x and 2y prefixes of bcrypt might not be supported
+		// Revert to 2a if this is the case
+		$prefix = (!$this->is_supported()) ? '$2a$' : $this->get_prefix();
+
+		// Do not support 8-bit characters with $2a$ bcrypt
+		// Also see http://www.php.net/security/crypt_blowfish.php
+		if ($prefix === self::PREFIX)
+		{
+			if (ord($password[strlen($password)-1]) & 128)
+			{
+				return false;
+			}
+		}
+
+		if ($salt == '')
+		{
+			$salt = $prefix . $this->cost_factor . '$' . $this->get_random_salt();
+		}
+
+		$hash = crypt($password, $salt);
+		if (strlen($hash) < 60)
+		{
+			return false;
+		}
+		return $hash;
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function check($password, $hash, $user_row = array())
+	{
+		$salt = substr($hash, 0, 29);
+		if (strlen($salt) != 29)
+		{
+			return false;
+		}
+
+		if ($this->helper->string_compare($hash, $this->hash($password, $salt)))
+		{
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	* Get a random salt value with a length of 22 characters
+	*
+	* @return string Salt for password hashing
+	*/
+	protected function get_random_salt()
+	{
+		return $this->helper->hash_encode64($this->helper->get_random_salt(22), 22);
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function get_settings_only($hash, $full = false)
+	{
+		if ($full)
+		{
+			$pos = stripos($hash, '$', 1) + 1;
+			$length = 22 + (strripos($hash, '$') + 1 - $pos);
+		}
+		else
+		{
+			$pos = strripos($hash, '$') + 1;
+			$length = 22;
+		}
+		return substr($hash, $pos, $length);
+	}
+}