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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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