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 <?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_Filter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Filter_Encrypt_Interface
  */
 // require_once 'Zend/Filter/Encrypt/Interface.php';
 
 /**
  * Encryption adapter for openssl
  *
  * @category   Zend
  * @package    Zend_Filter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Filter_Encrypt_Openssl implements Zend_Filter_Encrypt_Interface
 {
     /**
      * Definitions for encryption
      * array(
      *     'public'   => public keys
      *     'private'  => private keys
      *     'envelope' => resulting envelope keys
      * )
      */
     protected $_keys = array(
         'public'   => array(),
         'private'  => array(),
         'envelope' => array()
     );
 
     /**
      * Internal passphrase
      *
      * @var string
      */
     protected $_passphrase;
 
     /**
      * Internal compression
      *
      * @var array
      */
     protected $_compression;
 
     /**
      * Internal create package
      *
      * @var boolean
      */
     protected $_package = false;
 
     /**
      * Class constructor
      * Available options
      *   'public'      => public key
      *   'private'     => private key
      *   'envelope'    => envelope key
      *   'passphrase'  => passphrase
      *   'compression' => compress value with this compression adapter
      *   'package'     => pack envelope keys into encrypted string, simplifies decryption
      *
      * @param string|array $options Options for this adapter
      */
     public function __construct($options = array())
     {
         if (!extension_loaded('openssl')) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('This filter needs the openssl extension');
         }
 
         if ($options instanceof Zend_Config) {
             $options = $options->toArray();
         }
 
         if (!is_array($options)) {
             $options = array('public' => $options);
         }
 
         if (array_key_exists('passphrase', $options)) {
             $this->setPassphrase($options['passphrase']);
             unset($options['passphrase']);
         }
 
         if (array_key_exists('compression', $options)) {
             $this->setCompression($options['compression']);
             unset($options['compress']);
         }
 
         if (array_key_exists('package', $options)) {
             $this->setPackage($options['package']);
             unset($options['package']);
         }
 
         $this->_setKeys($options);
     }
 
     /**
      * Sets the encryption keys
      *
      * @param  string|array $keys Key with type association
      * @return Zend_Filter_Encrypt_Openssl
      */
     protected function _setKeys($keys)
     {
         if (!is_array($keys)) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('Invalid options argument provided to filter');
         }
 
         foreach ($keys as $type => $key) {
             if (ctype_print($key) && is_file(realpath($key)) && is_readable($key)) {
                 $file = fopen($key, 'r');
                 $cert = fread($file, 8192);
                 fclose($file);
             } else {
                 $cert = $key;
                 $key  = count($this->_keys[$type]);
             }
 
             switch ($type) {
                 case 'public':
                     $test = openssl_pkey_get_public($cert);
                     if ($test === false) {
                         // require_once 'Zend/Filter/Exception.php';
                         throw new Zend_Filter_Exception("Public key '{$cert}' not valid");
                     }
 
                     openssl_free_key($test);
                     $this->_keys['public'][$key] = $cert;
                     break;
                 case 'private':
                     $test = openssl_pkey_get_private($cert, $this->_passphrase);
                     if ($test === false) {
                         // require_once 'Zend/Filter/Exception.php';
                         throw new Zend_Filter_Exception("Private key '{$cert}' not valid");
                     }
 
                     openssl_free_key($test);
                     $this->_keys['private'][$key] = $cert;
                     break;
                 case 'envelope':
                     $this->_keys['envelope'][$key] = $cert;
                     break;
                 default:
                     break;
             }
         }
 
         return $this;
     }
 
     /**
      * Returns all public keys
      *
      * @return array
      */
     public function getPublicKey()
     {
         $key = $this->_keys['public'];
         return $key;
     }
 
     /**
      * Sets public keys
      *
      * @param  string|array $key Public keys
      * @return Zend_Filter_Encrypt_Openssl
      */
     public function setPublicKey($key)
     {
         if (is_array($key)) {
             foreach($key as $type => $option) {
                 if ($type !== 'public') {
                     $key['public'] = $option;
                     unset($key[$type]);
                 }
             }
         } else {
             $key = array('public' => $key);
         }
 
         return $this->_setKeys($key);
     }
 
     /**
      * Returns all private keys
      *
      * @return array
      */
     public function getPrivateKey()
     {
         $key = $this->_keys['private'];
         return $key;
     }
 
     /**
      * Sets private keys
      *
      * @param  string $key Private key
      * @param  string $passphrase
      * @return Zend_Filter_Encrypt_Openssl
      */
     public function setPrivateKey($key, $passphrase = null)
     {
         if (is_array($key)) {
             foreach($key as $type => $option) {
                 if ($type !== 'private') {
                     $key['private'] = $option;
                     unset($key[$type]);
                 }
             }
         } else {
             $key = array('private' => $key);
         }
 
         if ($passphrase !== null) {
             $this->setPassphrase($passphrase);
         }
 
         return $this->_setKeys($key);
     }
 
     /**
      * Returns all envelope keys
      *
      * @return array
      */
     public function getEnvelopeKey()
     {
         $key = $this->_keys['envelope'];
         return $key;
     }
 
     /**
      * Sets envelope keys
      *
      * @param  string|array $options Envelope keys
      * @return Zend_Filter_Encrypt_Openssl
      */
     public function setEnvelopeKey($key)
     {
         if (is_array($key)) {
             foreach($key as $type => $option) {
                 if ($type !== 'envelope') {
                     $key['envelope'] = $option;
                     unset($key[$type]);
                 }
             }
         } else {
             $key = array('envelope' => $key);
         }
 
         return $this->_setKeys($key);
     }
 
     /**
      * Returns the passphrase
      *
      * @return string
      */
     public function getPassphrase()
     {
         return $this->_passphrase;
     }
 
     /**
      * Sets a new passphrase
      *
      * @param string $passphrase
      * @return Zend_Filter_Encrypt_Openssl
      */
     public function setPassphrase($passphrase)
     {
         $this->_passphrase = $passphrase;
         return $this;
     }
 
     /**
      * Returns the compression
      *
      * @return array
      */
     public function getCompression()
     {
         return $this->_compression;
     }
 
     /**
      * Sets a internal compression for values to encrypt
      *
      * @param string|array $compression
      * @return Zend_Filter_Encrypt_Openssl
      */
     public function setCompression($compression)
     {
         if (is_string($this->_compression)) {
             $compression = array('adapter' => $compression);
         }
 
         $this->_compression = $compression;
         return $this;
     }
 
     /**
      * Returns if header should be packaged
      *
      * @return boolean
      */
     public function getPackage()
     {
         return $this->_package;
     }
 
     /**
      * Sets if the envelope keys should be included in the encrypted value
      *
      * @param boolean $package
      * @return Zend_Filter_Encrypt_Openssl
      */
     public function setPackage($package)
     {
         $this->_package = (boolean) $package;
         return $this;
     }
 
     /**
      * Encrypts $value with the defined settings
      * Note that you also need the "encrypted" keys to be able to decrypt
      *
      * @param  string $value Content to encrypt
      * @return string The encrypted content
      * @throws Zend_Filter_Exception
      */
     public function encrypt($value)
     {
         $encrypted     = array();
         $encryptedkeys = array();
 
         if (count($this->_keys['public']) == 0) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('Openssl can not encrypt without public keys');
         }
 
         $keys         = array();
         $fingerprints = array();
         $count        = -1;
         foreach($this->_keys['public'] as $key => $cert) {
             $keys[$key] = openssl_pkey_get_public($cert);
             if ($this->_package) {
                 $details = openssl_pkey_get_details($keys[$key]);
                 if ($details === false) {
                     $details = array('key' => 'ZendFramework');
                 }
 
                 ++$count;
                 $fingerprints[$count] = md5($details['key']);
             }
         }
 
         // compress prior to encryption
         if (!empty($this->_compression)) {
             // require_once 'Zend/Filter/Compress.php';
             $compress = new Zend_Filter_Compress($this->_compression);
             $value    = $compress->filter($value);
         }
 
         $crypt  = openssl_seal($value, $encrypted, $encryptedkeys, $keys);
         foreach ($keys as $key) {
             openssl_free_key($key);
         }
 
         if ($crypt === false) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('Openssl was not able to encrypt your content with the given options');
         }
 
         $this->_keys['envelope'] = $encryptedkeys;
 
         // Pack data and envelope keys into single string
         if ($this->_package) {
             $header = pack('n', count($this->_keys['envelope']));
             foreach($this->_keys['envelope'] as $key => $envKey) {
                 $header .= pack('H32n', $fingerprints[$key], strlen($envKey)) . $envKey;
             }
 
             $encrypted = $header . $encrypted;
         }
 
         return $encrypted;
     }
 
     /**
      * Defined by Zend_Filter_Interface
      *
      * Decrypts $value with the defined settings
      *
      * @param  string $value Content to decrypt
      * @return string The decrypted content
      * @throws Zend_Filter_Exception
      */
     public function decrypt($value)
     {
         $decrypted = "";
         $envelope  = current($this->getEnvelopeKey());
 
         if (count($this->_keys['private']) !== 1) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('Please give a private key for decryption with Openssl');
         }
 
         if (!$this->_package && empty($envelope)) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('Please give a envelope key for decryption with Openssl');
         }
 
         foreach($this->_keys['private'] as $key => $cert) {
             $keys = openssl_pkey_get_private($cert, $this->getPassphrase());
         }
 
         if ($this->_package) {
             $details = openssl_pkey_get_details($keys);
             if ($details !== false) {
                 $fingerprint = md5($details['key']);
             } else {
                 $fingerprint = md5("ZendFramework");
             }
 
             $count = unpack('ncount', $value);
             $count = $count['count'];
             $length  = 2;
             for($i = $count; $i > 0; --$i) {
                 $header = unpack('H32print/nsize', substr($value, $length, 18));
                 $length  += 18;
                 if ($header['print'] == $fingerprint) {
                     $envelope = substr($value, $length, $header['size']);
                 }
 
                 $length += $header['size'];
             }
 
             // remainder of string is the value to decrypt
             $value = substr($value, $length);
         }
 
         $crypt  = openssl_open($value, $decrypted, $envelope, $keys);
         openssl_free_key($keys);
 
         if ($crypt === false) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('Openssl was not able to decrypt you content with the given options');
         }
 
         // decompress after decryption
         if (!empty($this->_compression)) {
             // require_once 'Zend/Filter/Decompress.php';
             $decompress = new Zend_Filter_Decompress($this->_compression);
             $decrypted  = $decompress->filter($decrypted);
         }
 
         return $decrypted;
     }
 
     /**
      * Returns the adapter name
      *
      * @return string
      */
     public function toString()
     {
         return 'Openssl';
     }
 }