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-<?php
-
-/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
-
-/**
- * Crypt_GPG is a package to use GPG from PHP
- *
- * This file contains an object that handles GPG's status output for the
- * decrypt operation.
- *
- * PHP version 5
- *
- * LICENSE:
- *
- * This library is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as
- * published by the Free Software Foundation; either version 2.1 of the
- * License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * @category Encryption
- * @package Crypt_GPG
- * @author Michael Gauthier <mike@silverorange.com>
- * @copyright 2008-2009 silverorange
- * @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
- * @version CVS: $Id: DecryptStatusHandler.php 302814 2010-08-26 15:43:07Z gauthierm $
- * @link http://pear.php.net/package/Crypt_GPG
- * @link http://www.gnupg.org/
- */
-
-/**
- * Crypt_GPG base class
- */
-require_once 'Crypt/GPG.php';
-
-/**
- * GPG exception classes
- */
-require_once 'Crypt/GPG/Exceptions.php';
-
-
-/**
- * Status line handler for the decrypt operation
- *
- * This class is used internally by Crypt_GPG and does not need be used
- * directly. See the {@link Crypt_GPG} class for end-user API.
- *
- * This class is responsible for sending the passphrase commands when required
- * by the {@link Crypt_GPG::decrypt()} method. See <b>doc/DETAILS</b> in the
- * {@link http://www.gnupg.org/download/ GPG distribution} for detailed
- * information on GPG's status output for the decrypt operation.
- *
- * This class is also responsible for parsing error status and throwing a
- * meaningful exception in the event that decryption fails.
- *
- * @category Encryption
- * @package Crypt_GPG
- * @author Michael Gauthier <mike@silverorange.com>
- * @copyright 2008 silverorange
- * @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
- * @link http://pear.php.net/package/Crypt_GPG
- * @link http://www.gnupg.org/
- */
-class Crypt_GPG_DecryptStatusHandler
-{
- // {{{ protected properties
-
- /**
- * Keys used to decrypt
- *
- * The array is of the form:
- * <code>
- * array(
- * $key_id => array(
- * 'fingerprint' => $fingerprint,
- * 'passphrase' => $passphrase
- * )
- * );
- * </code>
- *
- * @var array
- */
- protected $keys = array();
-
- /**
- * Engine used to which passphrases are passed
- *
- * @var Crypt_GPG_Engine
- */
- protected $engine = null;
-
- /**
- * The id of the current sub-key used for decryption
- *
- * @var string
- */
- protected $currentSubKey = '';
-
- /**
- * Whether or not decryption succeeded
- *
- * If the message is only signed (compressed) and not encrypted, this is
- * always true. If the message is encrypted, this flag is set to false
- * until we know the decryption succeeded.
- *
- * @var boolean
- */
- protected $decryptionOkay = true;
-
- /**
- * Whether or not there was no data for decryption
- *
- * @var boolean
- */
- protected $noData = false;
-
- /**
- * Keys for which the passhprase is missing
- *
- * This contains primary user ids indexed by sub-key id and is used to
- * create helpful exception messages.
- *
- * @var array
- */
- protected $missingPassphrases = array();
-
- /**
- * Keys for which the passhprase is incorrect
- *
- * This contains primary user ids indexed by sub-key id and is used to
- * create helpful exception messages.
- *
- * @var array
- */
- protected $badPassphrases = array();
-
- /**
- * Keys that can be used to decrypt the data but are missing from the
- * keychain
- *
- * This is an array with both the key and value being the sub-key id of
- * the missing keys.
- *
- * @var array
- */
- protected $missingKeys = array();
-
- // }}}
- // {{{ __construct()
-
- /**
- * Creates a new decryption status handler
- *
- * @param Crypt_GPG_Engine $engine the GPG engine to which passphrases are
- * passed.
- * @param array $keys the decryption keys to use.
- */
- public function __construct(Crypt_GPG_Engine $engine, array $keys)
- {
- $this->engine = $engine;
- $this->keys = $keys;
- }
-
- // }}}
- // {{{ handle()
-
- /**
- * Handles a status line
- *
- * @param string $line the status line to handle.
- *
- * @return void
- */
- public function handle($line)
- {
- $tokens = explode(' ', $line);
- switch ($tokens[0]) {
- case 'ENC_TO':
- // Now we know the message is encrypted. Set flag to check if
- // decryption succeeded.
- $this->decryptionOkay = false;
-
- // this is the new key message
- $this->currentSubKeyId = $tokens[1];
- break;
-
- case 'NEED_PASSPHRASE':
- // send passphrase to the GPG engine
- $subKeyId = $tokens[1];
- if (array_key_exists($subKeyId, $this->keys)) {
- $passphrase = $this->keys[$subKeyId]['passphrase'];
- $this->engine->sendCommand($passphrase);
- } else {
- $this->engine->sendCommand('');
- }
- break;
-
- case 'USERID_HINT':
- // remember the user id for pretty exception messages
- $this->badPassphrases[$tokens[1]]
- = implode(' ', array_splice($tokens, 2));
-
- break;
-
- case 'GOOD_PASSPHRASE':
- // if we got a good passphrase, remove the key from the list of
- // bad passphrases.
- unset($this->badPassphrases[$this->currentSubKeyId]);
- break;
-
- case 'MISSING_PASSPHRASE':
- $this->missingPassphrases[$this->currentSubKeyId]
- = $this->currentSubKeyId;
-
- break;
-
- case 'NO_SECKEY':
- // note: this message is also received if there are multiple
- // recipients and a previous key had a correct passphrase.
- $this->missingKeys[$tokens[1]] = $tokens[1];
- break;
-
- case 'NODATA':
- $this->noData = true;
- break;
-
- case 'DECRYPTION_OKAY':
- // If the message is encrypted, this is the all-clear signal.
- $this->decryptionOkay = true;
- break;
- }
- }
-
- // }}}
- // {{{ throwException()
-
- /**
- * Takes the final status of the decrypt operation and throws an
- * appropriate exception
- *
- * If decryption was successful, no exception is thrown.
- *
- * @return void
- *
- * @throws Crypt_GPG_KeyNotFoundException if the private key needed to
- * decrypt the data is not in the user's keyring.
- *
- * @throws Crypt_GPG_NoDataException if specified data does not contain
- * GPG encrypted data.
- *
- * @throws Crypt_GPG_BadPassphraseException if a required passphrase is
- * incorrect or if a required passphrase is not specified. See
- * {@link Crypt_GPG::addDecryptKey()}.
- *
- * @throws Crypt_GPG_Exception if an unknown or unexpected error occurs.
- * Use the <i>debug</i> option and file a bug report if these
- * exceptions occur.
- */
- public function throwException()
- {
- $code = Crypt_GPG::ERROR_NONE;
-
- if (!$this->decryptionOkay) {
- if (count($this->badPassphrases) > 0) {
- $code = Crypt_GPG::ERROR_BAD_PASSPHRASE;
- } elseif (count($this->missingKeys) > 0) {
- $code = Crypt_GPG::ERROR_KEY_NOT_FOUND;
- } else {
- $code = Crypt_GPG::ERROR_UNKNOWN;
- }
- } elseif ($this->noData) {
- $code = Crypt_GPG::ERROR_NO_DATA;
- }
-
- switch ($code) {
- case Crypt_GPG::ERROR_NONE:
- break;
-
- case Crypt_GPG::ERROR_KEY_NOT_FOUND:
- if (count($this->missingKeys) > 0) {
- $keyId = reset($this->missingKeys);
- } else {
- $keyId = '';
- }
- throw new Crypt_GPG_KeyNotFoundException(
- 'Cannot decrypt data. No suitable private key is in the ' .
- 'keyring. Import a suitable private key before trying to ' .
- 'decrypt this data.', $code, $keyId);
-
- case Crypt_GPG::ERROR_BAD_PASSPHRASE:
- $badPassphrases = array_diff_key(
- $this->badPassphrases,
- $this->missingPassphrases
- );
-
- $missingPassphrases = array_intersect_key(
- $this->badPassphrases,
- $this->missingPassphrases
- );
-
- $message = 'Cannot decrypt data.';
- if (count($badPassphrases) > 0) {
- $message = ' Incorrect passphrase provided for keys: "' .
- implode('", "', $badPassphrases) . '".';
- }
- if (count($missingPassphrases) > 0) {
- $message = ' No passphrase provided for keys: "' .
- implode('", "', $badPassphrases) . '".';
- }
-
- throw new Crypt_GPG_BadPassphraseException($message, $code,
- $badPassphrases, $missingPassphrases);
-
- case Crypt_GPG::ERROR_NO_DATA:
- throw new Crypt_GPG_NoDataException(
- 'Cannot decrypt data. No PGP encrypted data was found in '.
- 'the provided data.', $code);
-
- default:
- throw new Crypt_GPG_Exception(
- 'Unknown error decrypting data.', $code);
- }
- }
-
- // }}}
-}
-
-?>
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