1 <?php

     2 /**

     3  * Zend Framework

     4  *

     5  * LICENSE

     6  *

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

     8  * with this package in the file LICENSE.txt.

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

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

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

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

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

    14  *

    15  * @category   Zend

    16  * @package    Zend_InfoCard

    17  * @subpackage Zend_InfoCard_Cipher

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

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

    20  * @version    $Id: Rsa.php 20096 2010-01-06 02:05:09Z bkarwin $

    21  */

    22 

    23 /**

    24  * Zend_InfoCard_Cipher_Pki_Adapter_Abstract

    25  */

    26 require_once 'Zend/InfoCard/Cipher/Pki/Adapter/Abstract.php';

    27 

    28 /**

    29  * Zend_InfoCard_Cipher_Pki_Rsa_Interface

    30  */

    31 require_once 'Zend/InfoCard/Cipher/Pki/Rsa/Interface.php';

    32 

    33 /**

    34  * RSA Public Key Encryption Cipher Object for the InfoCard component. Relies on OpenSSL

    35  * to implement the RSA algorithm

    36  *

    37  * @category   Zend

    38  * @package    Zend_InfoCard

    39  * @subpackage Zend_InfoCard_Cipher

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

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

    42  */

    43 class Zend_InfoCard_Cipher_Pki_Adapter_Rsa

    44     extends Zend_InfoCard_Cipher_Pki_Adapter_Abstract

    45     implements Zend_InfoCard_Cipher_Pki_Rsa_Interface

    46 {

    47 

    48     /**

    49      * Object Constructor

    50      *

    51      * @param integer $padding The type of Padding to use

    52      */

    53     public function __construct($padding = Zend_InfoCard_Cipher_Pki_Adapter_Abstract::NO_PADDING)

    54     {

    55         // Can't test this..

    56         // @codeCoverageIgnoreStart

    57         if(!extension_loaded('openssl')) {

    58             require_once 'Zend/InfoCard/Cipher/Exception.php';

    59             throw new Zend_InfoCard_Cipher_Exception("Use of this PKI RSA Adapter requires the openssl extension loaded");

    60         }

    61         // @codeCoverageIgnoreEnd

    62 

    63         $this->setPadding($padding);

    64     }

    65 

    66     /**

    67      * Decrypts RSA encrypted data using the given private key

    68      *

    69      * @throws Zend_InfoCard_Cipher_Exception

    70      * @param string $encryptedData The encrypted data in binary format

    71      * @param string $privateKey The private key in binary format

    72      * @param string $password The private key passphrase

    73      * @param integer $padding The padding to use during decryption (of not provided object value will be used)

    74      * @return string The decrypted data

    75      */

    76     public function decrypt($encryptedData, $privateKey, $password = null, $padding = null)

    77     {

    78         $private_key = openssl_pkey_get_private(array($privateKey, $password));

    79 

    80         if(!$private_key) {

    81             require_once 'Zend/InfoCard/Cipher/Exception.php';

    82             throw new Zend_InfoCard_Cipher_Exception("Failed to load private key");

    83         }

    84 

    85         if($padding !== null) {

    86             try {

    87                 $this->setPadding($padding);

    88             } catch(Exception $e) {

    89                 openssl_free_key($private_key);

    90                 throw $e;

    91             }

    92         }

    93 

    94         switch($this->getPadding()) {

    95             case self::NO_PADDING:

    96                 $openssl_padding = OPENSSL_NO_PADDING;

    97                 break;

    98             case self::OAEP_PADDING:

    99                 $openssl_padding = OPENSSL_PKCS1_OAEP_PADDING;

   100                 break;

   101         }

   102 

   103         $result = openssl_private_decrypt($encryptedData, $decryptedData, $private_key, $openssl_padding);

   104 

   105         openssl_free_key($private_key);

   106 

   107         if(!$result) {

   108             require_once 'Zend/InfoCard/Cipher/Exception.php';

   109             throw new Zend_InfoCard_Cipher_Exception("Unable to Decrypt Value using provided private key");

   110         }

   111 

   112         if($this->getPadding() == self::NO_PADDING) {

   113             $decryptedData = substr($decryptedData, 2);

   114             $start = strpos($decryptedData, 0) + 1;

   115             $decryptedData = substr($decryptedData, $start);

   116         }

   117 

   118         return $decryptedData;

   119     }

   120 }