<?php

defined('ABSPATH') || defined('DUPXABSPATH') || exit;
#
# Portable PHP password hashing framework.
#
# Version 0.5 / genuine.
#
# Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
# the public domain.  Revised in subsequent years, still public domain.
#
# There's absolutely no warranty.
#
# The homepage URL for this framework is:
#
#  http://www.openwall.com/phpass/
#
# Please be sure to update the Version line if you edit this file in any way.
# It is suggested that you leave the main version number intact, but indicate
# your project name (after the slash) and add your own revision information.
#
# Please do not change the "private" password hashing method implemented in
# here, thereby making your hashes incompatible.  However, if you must, please
# change the hash type identifier (the "$P$") to something different.
#
# Obviously, since this code is in the public domain, the above are not
# requirements (there can be none), but merely suggestions.
#

// Exit if accessed directly
if (! defined('DUPLICATOR_VERSION')) {
    exit;
}

class DUP_PasswordHash
{
    public $itoa64;
    public $iteration_count_log2;
    public $portable_hashes;
    public $random_state;

    public function __construct($iteration_count_log2, $portable_hashes)
    {
        $this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
        if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31) {
            $iteration_count_log2 = 8;
        }
        $this->iteration_count_log2 = $iteration_count_log2;
        $this->portable_hashes      = $portable_hashes;
        $this->random_state         = microtime();
        if (function_exists('getmypid')) {
            $this->random_state .= getmypid();
        }
    }

    public function PasswordHash($iteration_count_log2, $portable_hashes)
    {
        self::__construct($iteration_count_log2, $portable_hashes);
    }

    public function get_random_bytes($count)
    {
        $output = '';
        if (
            @is_readable('/dev/urandom') &&
            ($fh = @fopen('/dev/urandom', 'rb'))
        ) {
            $output = fread($fh, $count);
            fclose($fh);
        }

        if (strlen($output) < $count) {
            $output = '';
            for ($i = 0; $i < $count; $i += 16) {
                $this->random_state =
                    md5(microtime() . $this->random_state);
                $output            .= md5($this->random_state, true);
            }
            $output = substr($output, 0, $count);
        }

        return $output;
    }

    public function encode64($input, $count)
    {
        $output = '';
        $i      = 0;
        do {
            $value   = ord($input[$i++]);
            $output .= $this->itoa64[$value & 0x3f];
            if ($i < $count) {
                $value |= ord($input[$i]) << 8;
            }
            $output .= $this->itoa64[($value >> 6) & 0x3f];
            if ($i++ >= $count) {
                break;
            }
            if ($i < $count) {
                $value |= ord($input[$i]) << 16;
            }
            $output .= $this->itoa64[($value >> 12) & 0x3f];
            if ($i++ >= $count) {
                break;
            }
            $output .= $this->itoa64[($value >> 18) & 0x3f];
        } while ($i < $count);
        return $output;
    }

    public function gensalt_private($input)
    {
        $output  = '$P$';
        $output .= $this->itoa64[min($this->iteration_count_log2 +
            ((PHP_VERSION >= '5') ? 5 : 3), 30)];
        $output .= $this->encode64($input, 6);
        return $output;
    }

    public function crypt_private($password, $setting)
    {
        $output = '*0';
        if (substr($setting, 0, 2) === $output) {
            $output = '*1';
        }

        $id = substr($setting, 0, 3);
# We use "$P$", phpBB3 uses "$H$" for the same thing
        if ($id !== '$P$' && $id !== '$H$') {
            return $output;
        }

        $count_log2 = strpos($this->itoa64, $setting[3]);
        if ($count_log2 < 7 || $count_log2 > 30) {
            return $output;
        }

        $count = 1 << $count_log2;
        $salt  = substr($setting, 4, 8);
        if (strlen($salt) !== 8) {
            return $output;
        }

        # We were kind of forced to use MD5 here since it's the only
        # cryptographic primitive that was available in all versions
        # of PHP in use.  To implement our own low-level crypto in PHP
        # would have resulted in much worse performance and
        # consequently in lower iteration counts and hashes that are
        # quicker to crack (by non-PHP code).
        $hash = md5($salt . $password, true);
        do {
            $hash = md5($hash . $password, true);
        } while (--$count);
        $output  = substr($setting, 0, 12);
        $output .= $this->encode64($hash, 16);
        return $output;
    }

    public function gensalt_blowfish($input)
    {
        # This one needs to use a different order of characters and a
        # different encoding scheme from the one in encode64() above.
        # We care because the last character in our encoded string will
        # only represent 2 bits.  While two known implementations of
        # bcrypt will happily accept and correct a salt string which
        # has the 4 unused bits set to non-zero, we do not want to take
        # chances and we also do not want to waste an additional byte
        # of entropy.
        $itoa64  = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
        $output  = '$2a$';
        $output .= chr(ord('0') + (int)($this->iteration_count_log2 / 10));
        $output .= chr(ord('0') + $this->iteration_count_log2 % 10);
        $output .= '$';
        $i       = 0;
        do {
            $c1      = ord($input[$i++]);
            $output .= $itoa64[$c1 >> 2];
            $c1      = ($c1 & 0x03) << 4;
            if ($i >= 16) {
                $output .= $itoa64[$c1];
                break;
            }

            $c2      = ord($input[$i++]);
            $c1     |= $c2 >> 4;
            $output .= $itoa64[$c1];
            $c1      = ($c2 & 0x0f) << 2;
            $c2      = ord($input[$i++]);
            $c1     |= $c2 >> 6;
            $output .= $itoa64[$c1];
            $output .= $itoa64[$c2 & 0x3f];
        } while (1);
        return $output;
    }

    public function HashPassword($password)
    {
        $random = '';
        if (CRYPT_BLOWFISH === 1 && !$this->portable_hashes) {
            $random = $this->get_random_bytes(16);
            $hash   =
                crypt($password, $this->gensalt_blowfish($random));
            if (strlen($hash) === 60) {
                return $hash;
            }
        }

        if (strlen($random) < 6) {
            $random = $this->get_random_bytes(6);
        }
        $hash =
            $this->crypt_private(
                $password,
                $this->gensalt_private($random)
            );
        if (strlen($hash) === 34) {
            return $hash;
        }

        # Returning '*' on error is safe here, but would _not_ be safe
        # in a crypt(3)-like function used _both_ for generating new
        # hashes and for validating passwords against existing hashes.
        return '*';
    }

    public function CheckPassword($password, $stored_hash)
    {
        $hash = $this->crypt_private($password, $stored_hash);
        if ($hash[0] === '*') {
            $hash = crypt($password, $stored_hash);
        }

        return $hash === $stored_hash;
    }
}
