2010-02-22 14:05:32 +00:00
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<?php
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/**
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, StatusNet, Inc.
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*
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* A sample module to show best practices for StatusNet plugins
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*
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* PHP version 5
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @package StatusNet
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* @author James Walker <james@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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require_once 'Crypt/RSA.php';
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interface Magicsig
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{
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public function sign($bytes);
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public function verify($signed, $signature_b64);
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}
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class MagicsigRsaSha256
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{
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public $keypair;
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public function __construct($init = null)
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{
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if (is_null($init)) {
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$this->generate();
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} else {
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$this->fromString($init);
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}
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}
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public function generate($key_length = 512)
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{
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$keypair = new Crypt_RSA_KeyPair($key_length);
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$params['public_key'] = $keypair->getPublicKey();
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$params['private_key'] = $keypair->getPrivateKey();
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2010-02-23 00:00:27 +00:00
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PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
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2010-02-22 14:05:32 +00:00
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$this->keypair = new Crypt_RSA($params);
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2010-02-23 00:00:27 +00:00
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PEAR::popErrorHandling();
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2010-02-22 14:05:32 +00:00
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}
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public function toString($full_pair = true)
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{
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$public_key = $this->keypair->_public_key;
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$private_key = $this->keypair->_private_key;
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$mod = base64_url_encode($public_key->getModulus());
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$exp = base64_url_encode($public_key->getExponent());
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$private_exp = '';
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if ($full_pair && $private_key->getExponent()) {
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$private_exp = '.' . base64_url_encode($private_key->getExponent());
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}
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return 'RSA.' . $mod . '.' . $exp . $private_exp;
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}
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public function fromString($text)
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{
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2010-02-23 00:00:27 +00:00
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PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
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2010-02-22 14:05:32 +00:00
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// remove whitespace
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$text = preg_replace('/\s+/', '', $text);
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// parse components
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if (!preg_match('/RSA\.([^\.]+)\.([^\.]+)(.([^\.]+))?/', $text, $matches)) {
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return false;
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}
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$mod = base64_url_decode($matches[1]);
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$exp = base64_url_decode($matches[2]);
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if ($matches[4]) {
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$private_exp = base64_url_decode($matches[4]);
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}
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$params['public_key'] = new Crypt_RSA_KEY($mod, $exp, 'public');
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if ($params['public_key']->isError()) {
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$error = $params['public_key']->getLastError();
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print $error->getMessage();
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exit;
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}
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if ($private_exp) {
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$params['private_key'] = new Crypt_RSA_KEY($mod, $private_exp, 'private');
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if ($params['private_key']->isError()) {
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$error = $params['private_key']->getLastError();
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print $error->getMessage();
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exit;
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}
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}
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$this->keypair = new Crypt_RSA($params);
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2010-02-23 00:00:27 +00:00
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PEAR::popErrorHandling();
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2010-02-22 14:05:32 +00:00
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}
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public function getName()
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{
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return 'RSA-SHA256';
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}
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public function sign($bytes)
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{
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$sig = $this->keypair->createSign($bytes, null, 'sha256');
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if ($this->keypair->isError()) {
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$error = $this->keypair->getLastError();
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common_log(LOG_DEBUG, 'RSA Error: '. $error->getMessage());
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}
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return $sig;
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}
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public function verify($signed_bytes, $signature)
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{
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$result = $this->keypair->validateSign($signed_bytes, $signature, null, 'sha256');
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if ($this->keypair->isError()) {
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$error = $this->keypair->getLastError();
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//common_log(LOG_DEBUG, 'RSA Error: '. $error->getMessage());
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print $error->getMessage();
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}
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return $result;
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}
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}
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// Define a sha256 function for hashing
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// (Crypt_RSA should really be updated to use hash() )
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function sha256($bytes)
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{
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return hash('sha256', $bytes);
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}
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function base64_url_encode($input)
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{
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return strtr(base64_encode($input), '+/', '-_');
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}
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function base64_url_decode($input)
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{
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return base64_decode(strtr($input, '-_', '+/'));
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}
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