Md5Salt.php

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<?php
namespace TYPO3\CMS\Saltedpasswords\Salt;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class Md5Salt extends AbstractSalt implements SaltInterface
{
    const ITOA64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

    protected static $saltLengthMD5 = 6;

    protected static $saltSuffixMD5 = '$';

    protected static $settingMD5 = '$1$';

    protected function applySettingsToSalt($salt)
    {
        $saltWithSettings = $salt;
        $reqLenBase64 = $this->getLengthBase64FromBytes($this->getSaltLength());
        // Salt without setting
        if (strlen($salt) == $reqLenBase64) {
            $saltWithSettings = $this->getSetting() . $salt . $this->getSaltSuffix();
        }
        return $saltWithSettings;
    }

    public function checkPassword($plainPW, $saltedHashPW)
    {
        $isCorrect = false;
        if ($this->isValidSalt($saltedHashPW)) {
            $isCorrect = crypt($plainPW, $saltedHashPW) == $saltedHashPW;
        }
        return $isCorrect;
    }

    protected function getGeneratedSalt()
    {
        $randomBytes = \TYPO3\CMS\Core\Utility\GeneralUtility::generateRandomBytes($this->getSaltLength());
        return $this->base64Encode($randomBytes, $this->getSaltLength());
    }

    public function getHashedPassword($password, $salt = null)
    {
        $saltedPW = null;
        if (!empty($password)) {
            if (empty($salt) || !$this->isValidSalt($salt)) {
                $salt = $this->getGeneratedSalt();
            }
            $saltedPW = crypt($password, $this->applySettingsToSalt($salt));
        }
        return $saltedPW;
    }

    protected function getItoa64()
    {
        return self::ITOA64;
    }

    public function isAvailable()
    {
        return CRYPT_MD5;
    }

    public function getSaltLength()
    {
        return self::$saltLengthMD5;
    }

    protected function getSaltSuffix()
    {
        return self::$saltSuffixMD5;
    }

    public function getSetting()
    {
        return self::$settingMD5;
    }

    public function isHashUpdateNeeded($passString)
    {
        return false;
    }

    public function isValidSalt($salt)
    {
        $isValid = ($skip = false);
        $reqLenBase64 = $this->getLengthBase64FromBytes($this->getSaltLength());
        if (strlen($salt) >= $reqLenBase64) {
            // Salt with prefixed setting
            if (!strncmp('$', $salt, 1)) {
                if (!strncmp($this->getSetting(), $salt, strlen($this->getSetting()))) {
                    $isValid = true;
                    $salt = substr($salt, strlen($this->getSetting()));
                } else {
                    $skip = true;
                }
            }
            // Checking base64 characters
            if (!$skip && strlen($salt) >= $reqLenBase64) {
                if (preg_match('/^[' . preg_quote($this->getItoa64(), '/') . ']{' . $reqLenBase64 . ',' . $reqLenBase64 . '}$/', substr($salt, 0, $reqLenBase64))) {
                    $isValid = true;
                }
            }
        }
        return $isValid;
    }

    public function isValidSaltedPW($saltedPW)
    {
        $isValid = false;
        $isValid = !strncmp($this->getSetting(), $saltedPW, strlen($this->getSetting()));
        if ($isValid) {
            $isValid = $this->isValidSalt($saltedPW);
        }
        return $isValid;
    }
}