bcrypt
Daniel Triendl
11 years ago
parent
221ea8177c
commit
3eecd85257
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<?php
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# ***** BEGIN LICENSE BLOCK *****
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
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#
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# The contents of this file are subject to the Mozilla Public License Version
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# 1.1 (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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# http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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#
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# The Original Code is http://stackoverflow.com/a/6337021/833893
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#
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# Contributor(s):
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# Daniel Triendl <daniel@pew.cc>
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#
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# Alternatively, the contents of this file may be used under the terms of
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# either the GNU General Public License Version 2 or later (the "GPL"), or
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# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# in which case the provisions of the GPL or the LGPL are applicable instead
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# of those above. If you wish to allow use of your version of this file only
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# under the terms of either the GPL or the LGPL, and not to allow others to
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# use your version of this file under the terms of the MPL, indicate your
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# decision by deleting the provisions above and replace them with the notice
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# and other provisions required by the GPL or the LGPL. If you do not delete
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# the provisions above, a recipient may use your version of this file under
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# the terms of any one of the MPL, the GPL or the LGPL.
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#
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# ***** END LICENSE BLOCK *****
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interface WeaveHash {
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public function hash($input);
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public function verify($input, $existingHash);
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public function needsUpdate($existingHash);
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}
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class WeaveHashMD5 implements WeaveHash {
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public function hash($input) {
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return md5($input);
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}
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public function verify($input, $existingHash) {
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return $this->hash($input) == $existingHash;
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}
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public function needsUpdate($existingHash) {
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return substr($existingHash, 0, 4) == "$2a$";
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}
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}
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class WeaveHashBCrypt implements WeaveHash {
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private $_rounds;
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public function __construct($rounds = 12) {
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if(CRYPT_BLOWFISH != 1) {
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throw new Exception("bcrypt not available");
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}
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$this->_rounds = $rounds;
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}
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public function hash($input) {
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$hash = crypt($input, $this->getSalt());
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if (strlen($hash) <= 13) {
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throw new Exception("error while generating hash");
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}
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return $hash;
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}
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public function verify($input, $existingHash) {
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if ($this->isMD5($existingHash)) {
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$md5 = new WeaveHashMD5();
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return $md5->verify($input, $existingHash);
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}
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$hash = crypt($input, $existingHash);
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return $hash === $existingHash;
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}
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public function needsUpdate($existingHash) {
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$identifier = $this->getIdentifier();
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return substr($existingHash, 0, strlen($identifier)) != $identifier;
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}
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private function isMD5($existingHash) {
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return substr($existingHash, 0, 4) != "$2a$";
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}
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private function getSalt() {
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$salt = $this->getIdentifier();
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$bytes = $this->getRandomBytes(16);
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$salt .= $this->encodeBytes($bytes);
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return $salt;
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}
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private function getIdentifier() {
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return sprintf("$2a$%02d$", $this->_rounds);
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}
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private $randomState;
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private function getRandomBytes($count) {
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$bytes = '';
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if(function_exists('openssl_random_pseudo_bytes') &&
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(strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN')) { // OpenSSL slow on Win
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$bytes = openssl_random_pseudo_bytes($count);
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}
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if($bytes === '' && is_readable('/dev/urandom') &&
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($hRand = @fopen('/dev/urandom', 'rb')) !== FALSE) {
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$bytes = fread($hRand, $count);
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fclose($hRand);
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}
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if(strlen($bytes) < $count) {
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$bytes = '';
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if($this->randomState === null) {
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$this->randomState = microtime();
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if(function_exists('getmypid')) {
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$this->randomState .= getmypid();
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}
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}
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for($i = 0; $i < $count; $i += 16) {
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$this->randomState = md5(microtime() . $this->randomState);
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if (PHP_VERSION >= '5') {
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$bytes .= md5($this->randomState, true);
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} else {
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$bytes .= pack('H*', md5($this->randomState));
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}
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}
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$bytes = substr($bytes, 0, $count);
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}
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return $bytes;
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}
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private function encodeBytes($input) {
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// The following is code from the PHP Password Hashing Framework
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$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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$output = '';
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$i = 0;
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do {
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$c1 = ord($input[$i++]);
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$output .= $itoa64[$c1 >> 2];
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$c1 = ($c1 & 0x03) << 4;
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if ($i >= 16) {
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$output .= $itoa64[$c1];
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break;
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}
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$c2 = ord($input[$i++]);
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$c1 |= $c2 >> 4;
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$output .= $itoa64[$c1];
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$c1 = ($c2 & 0x0f) << 2;
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$c2 = ord($input[$i++]);
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$c1 |= $c2 >> 6;
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$output .= $itoa64[$c1];
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$output .= $itoa64[$c2 & 0x3f];
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} while (1);
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return $output;
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}
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}
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class WeaveHashFactory {
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public static function factory() {
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if (BCRYPT) {
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return new WeaveHashBCrypt(BCRYPT_ROUNDS);
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} else {
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return new WeaveHashMD5();
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}
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}
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}
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?>
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