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[vanilla-miry.git] / library / People / People.Class.PasswordHash.php

<?php
/**
 *  Portable PHP password hashing framework.
 * 
 *  Version 0.1 / genuine.
 * 
 *  Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
 *  the 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.

 * @author  Solar Designer <solar at openwall.com
 * @license none - Public domain
 * @package People
 * @version 1.1.8
 */


/**
 * Phpass - create strong password hash
 * @package People
 */
class PasswordHash {
        var $itoa64;
        var $iteration_count_log2;
        var $portable_hashes;
        var $random_state;

        function PasswordHash($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() . getmypid();
        }

        function get_random_bytes($count)
        {
                $output = '';
                if (($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);
                                $output .=
                                    pack('H*', md5($this->random_state));
                        }
                        $output = substr($output, 0, $count);
                }

                return $output;
        }

        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;
        }

        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;
        }

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

                if (substr($setting, 0, 3) != '$P$')
                        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're kind of forced to use MD5 here since it's the only
                // cryptographic primitive available in all versions of PHP
                // currently in use.  To implement our own low-level crypto
                // in PHP would result in much worse performance and
                // consequently in lower iteration counts and hashes that are
                // quicker to crack (by non-PHP code).
                if (PHP_VERSION >= '5') {
                        $hash = md5($salt . $password, TRUE);
                        do {
                                $hash = md5($hash . $password, TRUE);
                        } while (--$count);
                } else {
                        $hash = pack('H*', md5($salt . $password));
                        do {
                                $hash = pack('H*', md5($hash . $password));
                        } while (--$count);
                }

                $output = substr($setting, 0, 12);
                $output .= $this->encode64($hash, 16);

                return $output;
        }

        function gensalt_extended($input)
        {
                $count_log2 = min($this->iteration_count_log2 + 8, 24);
                // This should be odd to not reveal weak DES keys, and the
                // maximum valid value is (2**24 - 1) which is odd anyway.
                $count = (1 << $count_log2) - 1;

                $output = '_';
                $output .= $this->itoa64[$count & 0x3f];
                $output .= $this->itoa64[($count >> 6) & 0x3f];
                $output .= $this->itoa64[($count >> 12) & 0x3f];
                $output .= $this->itoa64[($count >> 18) & 0x3f];

                $output .= $this->encode64($input, 3);

                return $output;
        }

        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') + $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;
        }

        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 (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
                        if (strlen($random) < 3)
                                $random = $this->get_random_bytes(3);
                        $hash =
                            crypt($password, $this->gensalt_extended($random));
                        if (strlen($hash) == 20)
                                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 '*';
        }

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

                return $hash == $stored_hash;
        }
}

/**
 * Create stronger password hash
 * but still allow to check the password against old password storage has
 * 
 * @package People
 */
class PeoplePasswordHash extends PasswordHash  {
        /**
         * @var Context;
         */
        var $Context;
        
        /**
         * Chech password against stored password
         * 
         * The stored password can be plain, a md5 hash or a phpass hash 
         *
         * @param User $User
         * @param string $Password
         * @return boolean
         */
        function CheckPassword($User, $Password, $RegenerateHash=1) {
                if ($User->Password[0] === '_' || $User->Password[0] === '$') {
                        return parent::CheckPassword($Password, $User->Password);
                } else if ($Password && $User->Password !== '*'
                        && ($Password === $User->Password || md5($Password) === $User->Password)
                ) {
                        if ($RegenerateHash) {
                                $this->SetNewPassword($User, $Password);
                        }
                        return true;
                }
                return false;
        }

        /**
         * Regenerate password
         *
         * @param User $User
         * @param string $Password
         */
        function SetNewPassword($User, $Password) {
                $UserManager = $this->Context->ObjectFactory->NewContextObject(
                        $this->Context, 'UserManager');
                $User->Password = parent::HashPassword($Password);
                return $UserManager->SaveUserCredentials($User);
        }

        /**
         * Constructor
         *
         * @param Context $Context
         * @return PeoplePasswordHash
         */
        function PeoplePasswordHash(&$Context) {
                $this->Context =& $Context;
                parent::PasswordHash(
                        $Context->Configuration['PASSWORD_HASH_ITERATION'],
                        $Context->Configuration['PASSWORD_HASH_PORTABLE']);
        }
}

?>