<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Crypt

 * @subpackage Rsa

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Rsa.php 23439 2010-11-23 21:10:14Z alexander $

 */

/**

 * @see Zend_Crypt_Rsa_Key_Private

 */

require_once 'Zend/Crypt/Rsa/Key/Private.php';

/**

 * @see Zend_Crypt_Rsa_Key_Public

 */

require_once 'Zend/Crypt/Rsa/Key/Public.php';

/**

 * @category   Zend

 * @package    Zend_Crypt

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Crypt_Rsa

{

    const BINARY = 'binary';

    const BASE64 = 'base64';

    protected $_privateKey;

    protected $_publicKey;

    /**

     * @var string

     */

    protected $_pemString;

    protected $_pemPath;

    protected $_certificateString;

    protected $_certificatePath;

    protected $_hashAlgorithm;

    protected $_passPhrase;

    /**

     * Class constructor

     *

     * @param array $options

     * @throws Zend_Crypt_Rsa_Exception

     */

    public function __construct(array $options = null)

    {

        if (!extension_loaded('openssl')) {

            require_once 'Zend/Crypt/Rsa/Exception.php';

            throw new Zend_Crypt_Rsa_Exception('Zend_Crypt_Rsa requires openssl extention to be loaded.');

        }

        // Set _hashAlgorithm property when we are sure, that openssl extension is loaded

        // and OPENSSL_ALGO_SHA1 constant is available

        $this->_hashAlgorithm = OPENSSL_ALGO_SHA1;

        if (isset($options)) {

            $this->setOptions($options);

        }

    }

    public function setOptions(array $options)

    {

        if (isset($options['passPhrase'])) {

            $this->_passPhrase = $options['passPhrase'];

        }

        foreach ($options as $option=>$value) {

            switch ($option) {

                case 'pemString':

                    $this->setPemString($value);

                    break;

                case 'pemPath':

                    $this->setPemPath($value);

                    break;

                case 'certificateString':

                    $this->setCertificateString($value);

                    break;

                case 'certificatePath':

                    $this->setCertificatePath($value);

                    break;

                case 'hashAlgorithm':

                    $this->setHashAlgorithm($value);

                    break;

            }

        }

    }

    public function getPrivateKey()

    {

        return $this->_privateKey;

    }

    public function getPublicKey()

    {

        return $this->_publicKey;

    }

    /**

     * @param string $data

     * @param Zend_Crypt_Rsa_Key_Private $privateKey

     * @param string $format

     * @return string

     */

    public function sign($data, Zend_Crypt_Rsa_Key_Private $privateKey = null, $format = null)

    {

        $signature = '';

        if (isset($privateKey)) {

            $opensslKeyResource = $privateKey->getOpensslKeyResource();

        } else {

            $opensslKeyResource = $this->_privateKey->getOpensslKeyResource();

        }

        $result = openssl_sign(

            $data, $signature,

            $opensslKeyResource,

            $this->getHashAlgorithm()

        );

        if ($format == self::BASE64) {

            return base64_encode($signature);

        }

        return $signature;

    }

    /**

     * @param string $data

     * @param string $signature

     * @param string $format

     * @return string

     */

    public function verifySignature($data, $signature, $format = null)

    {

        if ($format == self::BASE64) {

            $signature = base64_decode($signature);

        }

        $result = openssl_verify($data, $signature,

            $this->getPublicKey()->getOpensslKeyResource(),

            $this->getHashAlgorithm());

        return $result;

    }

    /**

     * @param string $data

     * @param Zend_Crypt_Rsa_Key $key

     * @param string $format

     * @return string

     */

    public function encrypt($data, Zend_Crypt_Rsa_Key $key, $format = null)

    {

        $encrypted = '';

        $function = 'openssl_public_encrypt';

        if ($key instanceof Zend_Crypt_Rsa_Key_Private) {

            $function = 'openssl_private_encrypt';

        }

        $function($data, $encrypted, $key->getOpensslKeyResource());

        if ($format == self::BASE64) {

            return base64_encode($encrypted);

        }

        return $encrypted;

    }

    /**

     * @param string $data

     * @param Zend_Crypt_Rsa_Key $key

     * @param string $format

     * @return string

     */

    public function decrypt($data, Zend_Crypt_Rsa_Key $key, $format = null)

    {

        $decrypted = '';

        if ($format == self::BASE64) {

            $data = base64_decode($data);

        }

        $function = 'openssl_private_decrypt';

        if ($key instanceof Zend_Crypt_Rsa_Key_Public) {

            $function = 'openssl_public_decrypt';

        }

        $function($data, $decrypted, $key->getOpensslKeyResource());

        return $decrypted;

    }

    public function generateKeys(array $configargs = null)

    {

        $config = null;

        $passPhrase = null;

        if ($configargs !== null) {

            if (isset($configargs['passPhrase'])) {

                $passPhrase = $configargs['passPhrase'];

                unset($configargs['passPhrase']);

            }

            $config = $this->_parseConfigArgs($configargs);

        }

        $privateKey = null;

        $publicKey = null;

        $resource = openssl_pkey_new($config);

        // above fails on PHP 5.3

        openssl_pkey_export($resource, $private, $passPhrase);

        $privateKey = new Zend_Crypt_Rsa_Key_Private($private, $passPhrase);

        $details = openssl_pkey_get_details($resource);

        $publicKey = new Zend_Crypt_Rsa_Key_Public($details['key']);

        $return = new ArrayObject(array(

           'privateKey'=>$privateKey,

           'publicKey'=>$publicKey

        ), ArrayObject::ARRAY_AS_PROPS);

        return $return;

    }

    /**

     * @param string $value

     */

    public function setPemString($value)

    {

        $this->_pemString = $value;

        try {

            $this->_privateKey = new Zend_Crypt_Rsa_Key_Private($this->_pemString, $this->_passPhrase);

            $this->_publicKey = $this->_privateKey->getPublicKey();

        } catch (Zend_Crypt_Exception $e) {

            $this->_privateKey = null;

            $this->_publicKey = new Zend_Crypt_Rsa_Key_Public($this->_pemString);

        }

    }

    public function setPemPath($value)

    {

        $this->_pemPath = $value;

        $this->setPemString(file_get_contents($this->_pemPath));

    }

    public function setCertificateString($value)

    {

        $this->_certificateString = $value;

        $this->_publicKey = new Zend_Crypt_Rsa_Key_Public($this->_certificateString, $this->_passPhrase);

    }

    public function setCertificatePath($value)

    {

        $this->_certificatePath = $value;

        $this->setCertificateString(file_get_contents($this->_certificatePath));

    }

    public function setHashAlgorithm($name)

    {

        switch (strtolower($name)) {

            case 'md2':

                $this->_hashAlgorithm = OPENSSL_ALGO_MD2;

                break;

            case 'md4':

                $this->_hashAlgorithm = OPENSSL_ALGO_MD4;

                break;

            case 'md5':

                $this->_hashAlgorithm = OPENSSL_ALGO_MD5;

                break;

            case 'sha1':

                $this->_hashAlgorithm = OPENSSL_ALGO_SHA1;

                break;

            case 'dss1':

                $this->_hashAlgorithm = OPENSSL_ALGO_DSS1;

                break;

        }

    }

    /**

     * @return string

     */

    public function getPemString()

    {

        return $this->_pemString;

    }

    public function getPemPath()

    {

        return $this->_pemPath;

    }

    public function getCertificateString()

    {

        return $this->_certificateString;

    }

    public function getCertificatePath()

    {

        return $this->_certificatePath;

    }

    public function getHashAlgorithm()

    {

        return $this->_hashAlgorithm;

    }

    protected function _parseConfigArgs(array $config = null)

    {

        $configs = array();

        if (isset($config['privateKeyBits'])) {

            $configs['private_key_bits'] = $config['privateKeyBits'];

        }

        if (!empty($configs)) {

            return $configs;

        }

        return null;

    }

}