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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 engine that handles GPG subprocess control and I/O.
- * PHP's process manipulation functions are used to handle the GPG subprocess.
- *
- * 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 Nathan Fredrickson <nathan@silverorange.com>
- * @author Michael Gauthier <mike@silverorange.com>
- * @copyright 2005-2010 silverorange
- * @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
- * @version CVS: $Id: Engine.php 302822 2010-08-26 17:30:57Z 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';
-
-/**
- * Standard PEAR exception is used if GPG binary is not found.
- */
-require_once 'PEAR/Exception.php';
-
-// {{{ class Crypt_GPG_Engine
-
-/**
- * Native PHP Crypt_GPG I/O engine
- *
- * 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 engine uses PHP's native process control functions to directly control
- * the GPG process. The GPG executable is required to be on the system.
- *
- * All data is passed to the GPG subprocess using file descriptors. This is the
- * most secure method of passing data to the GPG subprocess.
- *
- * @category Encryption
- * @package Crypt_GPG
- * @author Nathan Fredrickson <nathan@silverorange.com>
- * @author Michael Gauthier <mike@silverorange.com>
- * @copyright 2005-2010 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_Engine
-{
- // {{{ constants
-
- /**
- * Size of data chunks that are sent to and retrieved from the IPC pipes.
- *
- * PHP reads 8192 bytes. If this is set to less than 8192, PHP reads 8192
- * and buffers the rest so we might as well just read 8192.
- *
- * Using values other than 8192 also triggers PHP bugs.
- *
- * @see http://bugs.php.net/bug.php?id=35224
- */
- const CHUNK_SIZE = 8192;
-
- /**
- * Standard input file descriptor. This is used to pass data to the GPG
- * process.
- */
- const FD_INPUT = 0;
-
- /**
- * Standard output file descriptor. This is used to receive normal output
- * from the GPG process.
- */
- const FD_OUTPUT = 1;
-
- /**
- * Standard output file descriptor. This is used to receive error output
- * from the GPG process.
- */
- const FD_ERROR = 2;
-
- /**
- * GPG status output file descriptor. The status file descriptor outputs
- * detailed information for many GPG commands. See the second section of
- * the file <b>doc/DETAILS</b> in the
- * {@link http://www.gnupg.org/download/ GPG package} for a detailed
- * description of GPG's status output.
- */
- const FD_STATUS = 3;
-
- /**
- * Command input file descriptor. This is used for methods requiring
- * passphrases.
- */
- const FD_COMMAND = 4;
-
- /**
- * Extra message input file descriptor. This is used for passing signed
- * data when verifying a detached signature.
- */
- const FD_MESSAGE = 5;
-
- /**
- * Minimum version of GnuPG that is supported.
- */
- const MIN_VERSION = '1.0.2';
-
- // }}}
- // {{{ private class properties
-
- /**
- * Whether or not to use debugging mode
- *
- * When set to true, every GPG command is echoed before it is run. Sensitive
- * data is always handled using pipes and is not specified as part of the
- * command. As a result, sensitive data is never displayed when debug is
- * enabled. Sensitive data includes private key data and passphrases.
- *
- * Debugging is off by default.
- *
- * @var boolean
- * @see Crypt_GPG_Engine::__construct()
- */
- private $_debug = false;
-
- /**
- * Location of GPG binary
- *
- * @var string
- * @see Crypt_GPG_Engine::__construct()
- * @see Crypt_GPG_Engine::_getBinary()
- */
- private $_binary = '';
-
- /**
- * Directory containing the GPG key files
- *
- * This property only contains the path when the <i>homedir</i> option
- * is specified in the constructor.
- *
- * @var string
- * @see Crypt_GPG_Engine::__construct()
- */
- private $_homedir = '';
-
- /**
- * File path of the public keyring
- *
- * This property only contains the file path when the <i>public_keyring</i>
- * option is specified in the constructor.
- *
- * If the specified file path starts with <kbd>~/</kbd>, the path is
- * relative to the <i>homedir</i> if specified, otherwise to
- * <kbd>~/.gnupg</kbd>.
- *
- * @var string
- * @see Crypt_GPG_Engine::__construct()
- */
- private $_publicKeyring = '';
-
- /**
- * File path of the private (secret) keyring
- *
- * This property only contains the file path when the <i>private_keyring</i>
- * option is specified in the constructor.
- *
- * If the specified file path starts with <kbd>~/</kbd>, the path is
- * relative to the <i>homedir</i> if specified, otherwise to
- * <kbd>~/.gnupg</kbd>.
- *
- * @var string
- * @see Crypt_GPG_Engine::__construct()
- */
- private $_privateKeyring = '';
-
- /**
- * File path of the trust database
- *
- * This property only contains the file path when the <i>trust_db</i>
- * option is specified in the constructor.
- *
- * If the specified file path starts with <kbd>~/</kbd>, the path is
- * relative to the <i>homedir</i> if specified, otherwise to
- * <kbd>~/.gnupg</kbd>.
- *
- * @var string
- * @see Crypt_GPG_Engine::__construct()
- */
- private $_trustDb = '';
-
- /**
- * Array of pipes used for communication with the GPG binary
- *
- * This is an array of file descriptor resources.
- *
- * @var array
- */
- private $_pipes = array();
-
- /**
- * Array of currently opened pipes
- *
- * This array is used to keep track of remaining opened pipes so they can
- * be closed when the GPG subprocess is finished. This array is a subset of
- * the {@link Crypt_GPG_Engine::$_pipes} array and contains opened file
- * descriptor resources.
- *
- * @var array
- * @see Crypt_GPG_Engine::_closePipe()
- */
- private $_openPipes = array();
-
- /**
- * A handle for the GPG process
- *
- * @var resource
- */
- private $_process = null;
-
- /**
- * Whether or not the operating system is Darwin (OS X)
- *
- * @var boolean
- */
- private $_isDarwin = false;
-
- /**
- * Commands to be sent to GPG's command input stream
- *
- * @var string
- * @see Crypt_GPG_Engine::sendCommand()
- */
- private $_commandBuffer = '';
-
- /**
- * Array of status line handlers
- *
- * @var array
- * @see Crypt_GPG_Engine::addStatusHandler()
- */
- private $_statusHandlers = array();
-
- /**
- * Array of error line handlers
- *
- * @var array
- * @see Crypt_GPG_Engine::addErrorHandler()
- */
- private $_errorHandlers = array();
-
- /**
- * The error code of the current operation
- *
- * @var integer
- * @see Crypt_GPG_Engine::getErrorCode()
- */
- private $_errorCode = Crypt_GPG::ERROR_NONE;
-
- /**
- * File related to the error code of the current operation
- *
- * @var string
- * @see Crypt_GPG_Engine::getErrorFilename()
- */
- private $_errorFilename = '';
-
- /**
- * Key id related to the error code of the current operation
- *
- * @var string
- * @see Crypt_GPG_Engine::getErrorKeyId()
- */
- private $_errorkeyId = '';
-
- /**
- * The number of currently needed passphrases
- *
- * If this is not zero when the GPG command is completed, the error code is
- * set to {@link Crypt_GPG::ERROR_MISSING_PASSPHRASE}.
- *
- * @var integer
- */
- private $_needPassphrase = 0;
-
- /**
- * The input source
- *
- * This is data to send to GPG. Either a string or a stream resource.
- *
- * @var string|resource
- * @see Crypt_GPG_Engine::setInput()
- */
- private $_input = null;
-
- /**
- * The extra message input source
- *
- * Either a string or a stream resource.
- *
- * @var string|resource
- * @see Crypt_GPG_Engine::setMessage()
- */
- private $_message = null;
-
- /**
- * The output location
- *
- * This is where the output from GPG is sent. Either a string or a stream
- * resource.
- *
- * @var string|resource
- * @see Crypt_GPG_Engine::setOutput()
- */
- private $_output = '';
-
- /**
- * The GPG operation to execute
- *
- * @var string
- * @see Crypt_GPG_Engine::setOperation()
- */
- private $_operation;
-
- /**
- * Arguments for the current operation
- *
- * @var array
- * @see Crypt_GPG_Engine::setOperation()
- */
- private $_arguments = array();
-
- /**
- * The version number of the GPG binary
- *
- * @var string
- * @see Crypt_GPG_Engine::getVersion()
- */
- private $_version = '';
-
- /**
- * Cached value indicating whether or not mbstring function overloading is
- * on for strlen
- *
- * This is cached for optimal performance inside the I/O loop.
- *
- * @var boolean
- * @see Crypt_GPG_Engine::_byteLength()
- * @see Crypt_GPG_Engine::_byteSubstring()
- */
- private static $_mbStringOverload = null;
-
- // }}}
- // {{{ __construct()
-
- /**
- * Creates a new GPG engine
- *
- * Available options are:
- *
- * - <kbd>string homedir</kbd> - the directory where the GPG
- * keyring files are stored. If not
- * specified, Crypt_GPG uses the
- * default of <kbd>~/.gnupg</kbd>.
- * - <kbd>string publicKeyring</kbd> - the file path of the public
- * keyring. Use this if the public
- * keyring is not in the homedir, or
- * if the keyring is in a directory
- * not writable by the process
- * invoking GPG (like Apache). Then
- * you can specify the path to the
- * keyring with this option
- * (/foo/bar/pubring.gpg), and specify
- * a writable directory (like /tmp)
- * using the <i>homedir</i> option.
- * - <kbd>string privateKeyring</kbd> - the file path of the private
- * keyring. Use this if the private
- * keyring is not in the homedir, or
- * if the keyring is in a directory
- * not writable by the process
- * invoking GPG (like Apache). Then
- * you can specify the path to the
- * keyring with this option
- * (/foo/bar/secring.gpg), and specify
- * a writable directory (like /tmp)
- * using the <i>homedir</i> option.
- * - <kbd>string trustDb</kbd> - the file path of the web-of-trust
- * database. Use this if the trust
- * database is not in the homedir, or
- * if the database is in a directory
- * not writable by the process
- * invoking GPG (like Apache). Then
- * you can specify the path to the
- * trust database with this option
- * (/foo/bar/trustdb.gpg), and specify
- * a writable directory (like /tmp)
- * using the <i>homedir</i> option.
- * - <kbd>string binary</kbd> - the location of the GPG binary. If
- * not specified, the driver attempts
- * to auto-detect the GPG binary
- * location using a list of known
- * default locations for the current
- * operating system. The option
- * <kbd>gpgBinary</kbd> is a
- * deprecated alias for this option.
- * - <kbd>boolean debug</kbd> - whether or not to use debug mode.
- * When debug mode is on, all
- * communication to and from the GPG
- * subprocess is logged. This can be
- * useful to diagnose errors when
- * using Crypt_GPG.
- *
- * @param array $options optional. An array of options used to create the
- * GPG object. All options are optional and are
- * represented as key-value pairs.
- *
- * @throws Crypt_GPG_FileException if the <kbd>homedir</kbd> does not exist
- * and cannot be created. This can happen if <kbd>homedir</kbd> is
- * not specified, Crypt_GPG is run as the web user, and the web
- * user has no home directory. This exception is also thrown if any
- * of the options <kbd>publicKeyring</kbd>,
- * <kbd>privateKeyring</kbd> or <kbd>trustDb</kbd> options are
- * specified but the files do not exist or are are not readable.
- * This can happen if the user running the Crypt_GPG process (for
- * example, the Apache user) does not have permission to read the
- * files.
- *
- * @throws PEAR_Exception if the provided <kbd>binary</kbd> is invalid, or
- * if no <kbd>binary</kbd> is provided and no suitable binary could
- * be found.
- */
- public function __construct(array $options = array())
- {
- $this->_isDarwin = (strncmp(strtoupper(PHP_OS), 'DARWIN', 6) === 0);
-
- // populate mbstring overloading cache if not set
- if (self::$_mbStringOverload === null) {
- self::$_mbStringOverload = (extension_loaded('mbstring')
- && (ini_get('mbstring.func_overload') & 0x02) === 0x02);
- }
-
- // get homedir
- if (array_key_exists('homedir', $options)) {
- $this->_homedir = (string)$options['homedir'];
- } else {
- // note: this requires the package OS dep exclude 'windows'
- $info = posix_getpwuid(posix_getuid());
- $this->_homedir = $info['dir'].'/.gnupg';
- }
-
- // attempt to create homedir if it does not exist
- if (!is_dir($this->_homedir)) {
- if (@mkdir($this->_homedir, 0777, true)) {
- // Set permissions on homedir. Parent directories are created
- // with 0777, homedir is set to 0700.
- chmod($this->_homedir, 0700);
- } else {
- throw new Crypt_GPG_FileException('The \'homedir\' "' .
- $this->_homedir . '" is not readable or does not exist '.
- 'and cannot be created. This can happen if \'homedir\' '.
- 'is not specified in the Crypt_GPG options, Crypt_GPG is '.
- 'run as the web user, and the web user has no home '.
- 'directory.',
- 0, $this->_homedir);
- }
- }
-
- // get binary
- if (array_key_exists('binary', $options)) {
- $this->_binary = (string)$options['binary'];
- } elseif (array_key_exists('gpgBinary', $options)) {
- // deprecated alias
- $this->_binary = (string)$options['gpgBinary'];
- } else {
- $this->_binary = $this->_getBinary();
- }
-
- if ($this->_binary == '' || !is_executable($this->_binary)) {
- throw new PEAR_Exception('GPG binary not found. If you are sure '.
- 'the GPG binary is installed, please specify the location of '.
- 'the GPG binary using the \'binary\' driver option.');
- }
-
- /*
- * Note:
- *
- * Normally, GnuPG expects keyrings to be in the homedir and expects
- * to be able to write temporary files in the homedir. Sometimes,
- * keyrings are not in the homedir, or location of the keyrings does
- * not allow writing temporary files. In this case, the <i>homedir</i>
- * option by itself is not enough to specify the keyrings because GnuPG
- * can not write required temporary files. Additional options are
- * provided so you can specify the location of the keyrings separately
- * from the homedir.
- */
-
- // get public keyring
- if (array_key_exists('publicKeyring', $options)) {
- $this->_publicKeyring = (string)$options['publicKeyring'];
- if (!is_readable($this->_publicKeyring)) {
- throw new Crypt_GPG_FileException('The \'publicKeyring\' "' .
- $this->_publicKeyring . '" does not exist or is ' .
- 'not readable. Check the location and ensure the file ' .
- 'permissions are correct.', 0, $this->_publicKeyring);
- }
- }
-
- // get private keyring
- if (array_key_exists('privateKeyring', $options)) {
- $this->_privateKeyring = (string)$options['privateKeyring'];
- if (!is_readable($this->_privateKeyring)) {
- throw new Crypt_GPG_FileException('The \'privateKeyring\' "' .
- $this->_privateKeyring . '" does not exist or is ' .
- 'not readable. Check the location and ensure the file ' .
- 'permissions are correct.', 0, $this->_privateKeyring);
- }
- }
-
- // get trust database
- if (array_key_exists('trustDb', $options)) {
- $this->_trustDb = (string)$options['trustDb'];
- if (!is_readable($this->_trustDb)) {
- throw new Crypt_GPG_FileException('The \'trustDb\' "' .
- $this->_trustDb . '" does not exist or is not readable. ' .
- 'Check the location and ensure the file permissions are ' .
- 'correct.', 0, $this->_trustDb);
- }
- }
-
- if (array_key_exists('debug', $options)) {
- $this->_debug = (boolean)$options['debug'];
- }
- }
-
- // }}}
- // {{{ __destruct()
-
- /**
- * Closes open GPG subprocesses when this object is destroyed
- *
- * Subprocesses should never be left open by this class unless there is
- * an unknown error and unexpected script termination occurs.
- */
- public function __destruct()
- {
- $this->_closeSubprocess();
- }
-
- // }}}
- // {{{ addErrorHandler()
-
- /**
- * Adds an error handler method
- *
- * The method is run every time a new error line is received from the GPG
- * subprocess. The handler method must accept the error line to be handled
- * as its first parameter.
- *
- * @param callback $callback the callback method to use.
- * @param array $args optional. Additional arguments to pass as
- * parameters to the callback method.
- *
- * @return void
- */
- public function addErrorHandler($callback, array $args = array())
- {
- $this->_errorHandlers[] = array(
- 'callback' => $callback,
- 'args' => $args
- );
- }
-
- // }}}
- // {{{ addStatusHandler()
-
- /**
- * Adds a status handler method
- *
- * The method is run every time a new status line is received from the
- * GPG subprocess. The handler method must accept the status line to be
- * handled as its first parameter.
- *
- * @param callback $callback the callback method to use.
- * @param array $args optional. Additional arguments to pass as
- * parameters to the callback method.
- *
- * @return void
- */
- public function addStatusHandler($callback, array $args = array())
- {
- $this->_statusHandlers[] = array(
- 'callback' => $callback,
- 'args' => $args
- );
- }
-
- // }}}
- // {{{ sendCommand()
-
- /**
- * Sends a command to the GPG subprocess over the command file-descriptor
- * pipe
- *
- * @param string $command the command to send.
- *
- * @return void
- *
- * @sensitive $command
- */
- public function sendCommand($command)
- {
- if (array_key_exists(self::FD_COMMAND, $this->_openPipes)) {
- $this->_commandBuffer .= $command . PHP_EOL;
- }
- }
-
- // }}}
- // {{{ reset()
-
- /**
- * Resets the GPG engine, preparing it for a new operation
- *
- * @return void
- *
- * @see Crypt_GPG_Engine::run()
- * @see Crypt_GPG_Engine::setOperation()
- */
- public function reset()
- {
- $this->_operation = '';
- $this->_arguments = array();
- $this->_input = null;
- $this->_message = null;
- $this->_output = '';
- $this->_errorCode = Crypt_GPG::ERROR_NONE;
- $this->_needPassphrase = 0;
- $this->_commandBuffer = '';
-
- $this->_statusHandlers = array();
- $this->_errorHandlers = array();
-
- $this->addStatusHandler(array($this, '_handleErrorStatus'));
- $this->addErrorHandler(array($this, '_handleErrorError'));
-
- if ($this->_debug) {
- $this->addStatusHandler(array($this, '_handleDebugStatus'));
- $this->addErrorHandler(array($this, '_handleDebugError'));
- }
- }
-
- // }}}
- // {{{ run()
-
- /**
- * Runs the current GPG operation
- *
- * This creates and manages the GPG subprocess.
- *
- * The operation must be set with {@link Crypt_GPG_Engine::setOperation()}
- * before this method is called.
- *
- * @return void
- *
- * @throws Crypt_GPG_InvalidOperationException if no operation is specified.
- *
- * @see Crypt_GPG_Engine::reset()
- * @see Crypt_GPG_Engine::setOperation()
- */
- public function run()
- {
- if ($this->_operation === '') {
- throw new Crypt_GPG_InvalidOperationException('No GPG operation ' .
- 'specified. Use Crypt_GPG_Engine::setOperation() before ' .
- 'calling Crypt_GPG_Engine::run().');
- }
-
- $this->_openSubprocess();
- $this->_process();
- $this->_closeSubprocess();
- }
-
- // }}}
- // {{{ getErrorCode()
-
- /**
- * Gets the error code of the last executed operation
- *
- * This value is only meaningful after {@link Crypt_GPG_Engine::run()} has
- * been executed.
- *
- * @return integer the error code of the last executed operation.
- */
- public function getErrorCode()
- {
- return $this->_errorCode;
- }
-
- // }}}
- // {{{ getErrorFilename()
-
- /**
- * Gets the file related to the error code of the last executed operation
- *
- * This value is only meaningful after {@link Crypt_GPG_Engine::run()} has
- * been executed. If there is no file related to the error, an empty string
- * is returned.
- *
- * @return string the file related to the error code of the last executed
- * operation.
- */
- public function getErrorFilename()
- {
- return $this->_errorFilename;
- }
-
- // }}}
- // {{{ getErrorKeyId()
-
- /**
- * Gets the key id related to the error code of the last executed operation
- *
- * This value is only meaningful after {@link Crypt_GPG_Engine::run()} has
- * been executed. If there is no key id related to the error, an empty
- * string is returned.
- *
- * @return string the key id related to the error code of the last executed
- * operation.
- */
- public function getErrorKeyId()
- {
- return $this->_errorKeyId;
- }
-
- // }}}
- // {{{ setInput()
-
- /**
- * Sets the input source for the current GPG operation
- *
- * @param string|resource &$input either a reference to the string
- * containing the input data or an open
- * stream resource containing the input
- * data.
- *
- * @return void
- */
- public function setInput(&$input)
- {
- $this->_input =& $input;
- }
-
- // }}}
- // {{{ setMessage()
-
- /**
- * Sets the message source for the current GPG operation
- *
- * Detached signature data should be specified here.
- *
- * @param string|resource &$message either a reference to the string
- * containing the message data or an open
- * stream resource containing the message
- * data.
- *
- * @return void
- */
- public function setMessage(&$message)
- {
- $this->_message =& $message;
- }
-
- // }}}
- // {{{ setOutput()
-
- /**
- * Sets the output destination for the current GPG operation
- *
- * @param string|resource &$output either a reference to the string in
- * which to store GPG output or an open
- * stream resource to which the output data
- * should be written.
- *
- * @return void
- */
- public function setOutput(&$output)
- {
- $this->_output =& $output;
- }
-
- // }}}
- // {{{ setOperation()
-
- /**
- * Sets the operation to perform
- *
- * @param string $operation the operation to perform. This should be one
- * of GPG's operations. For example,
- * <kbd>--encrypt</kbd>, <kbd>--decrypt</kbd>,
- * <kbd>--sign</kbd>, etc.
- * @param array $arguments optional. Additional arguments for the GPG
- * subprocess. See the GPG manual for specific
- * values.
- *
- * @return void
- *
- * @see Crypt_GPG_Engine::reset()
- * @see Crypt_GPG_Engine::run()
- */
- public function setOperation($operation, array $arguments = array())
- {
- $this->_operation = $operation;
- $this->_arguments = $arguments;
- }
-
- // }}}
- // {{{ getVersion()
-
- /**
- * Gets the version of the GnuPG binary
- *
- * @return string a version number string containing the version of GnuPG
- * being used. This value is suitable to use with PHP's
- * version_compare() function.
- *
- * @throws Crypt_GPG_Exception if an unknown or unexpected error occurs.
- * Use the <kbd>debug</kbd> option and file a bug report if these
- * exceptions occur.
- *
- * @throws Crypt_GPG_UnsupportedException if the provided binary is not
- * GnuPG or if the GnuPG version is less than 1.0.2.
- */
- public function getVersion()
- {
- if ($this->_version == '') {
-
- $options = array(
- 'homedir' => $this->_homedir,
- 'binary' => $this->_binary,
- 'debug' => $this->_debug
- );
-
- $engine = new self($options);
- $info = '';
-
- // Set a garbage version so we do not end up looking up the version
- // recursively.
- $engine->_version = '1.0.0';
-
- $engine->reset();
- $engine->setOutput($info);
- $engine->setOperation('--version');
- $engine->run();
-
- $code = $this->getErrorCode();
-
- if ($code !== Crypt_GPG::ERROR_NONE) {
- throw new Crypt_GPG_Exception(
- 'Unknown error getting GnuPG version information. Please ' .
- 'use the \'debug\' option when creating the Crypt_GPG ' .
- 'object, and file a bug report at ' . Crypt_GPG::BUG_URI,
- $code);
- }
-
- $matches = array();
- $expression = '/gpg \(GnuPG\) (\S+)/';
-
- if (preg_match($expression, $info, $matches) === 1) {
- $this->_version = $matches[1];
- } else {
- throw new Crypt_GPG_Exception(
- 'No GnuPG version information provided by the binary "' .
- $this->_binary . '". Are you sure it is GnuPG?');
- }
-
- if (version_compare($this->_version, self::MIN_VERSION, 'lt')) {
- throw new Crypt_GPG_Exception(
- 'The version of GnuPG being used (' . $this->_version .
- ') is not supported by Crypt_GPG. The minimum version ' .
- 'required by Crypt_GPG is ' . self::MIN_VERSION);
- }
- }
-
-
- return $this->_version;
- }
-
- // }}}
- // {{{ _handleErrorStatus()
-
- /**
- * Handles error values in the status output from GPG
- *
- * This method is responsible for setting the
- * {@link Crypt_GPG_Engine::$_errorCode}. See <b>doc/DETAILS</b> in the
- * {@link http://www.gnupg.org/download/ GPG distribution} for detailed
- * information on GPG's status output.
- *
- * @param string $line the status line to handle.
- *
- * @return void
- */
- private function _handleErrorStatus($line)
- {
- $tokens = explode(' ', $line);
- switch ($tokens[0]) {
- case 'BAD_PASSPHRASE':
- $this->_errorCode = Crypt_GPG::ERROR_BAD_PASSPHRASE;
- break;
-
- case 'MISSING_PASSPHRASE':
- $this->_errorCode = Crypt_GPG::ERROR_MISSING_PASSPHRASE;
- break;
-
- case 'NODATA':
- $this->_errorCode = Crypt_GPG::ERROR_NO_DATA;
- break;
-
- case 'DELETE_PROBLEM':
- if ($tokens[1] == '1') {
- $this->_errorCode = Crypt_GPG::ERROR_KEY_NOT_FOUND;
- break;
- } elseif ($tokens[1] == '2') {
- $this->_errorCode = Crypt_GPG::ERROR_DELETE_PRIVATE_KEY;
- break;
- }
- break;
-
- case 'IMPORT_RES':
- if ($tokens[12] > 0) {
- $this->_errorCode = Crypt_GPG::ERROR_DUPLICATE_KEY;
- }
- break;
-
- case 'NO_PUBKEY':
- case 'NO_SECKEY':
- $this->_errorKeyId = $tokens[1];
- $this->_errorCode = Crypt_GPG::ERROR_KEY_NOT_FOUND;
- break;
-
- case 'NEED_PASSPHRASE':
- $this->_needPassphrase++;
- break;
-
- case 'GOOD_PASSPHRASE':
- $this->_needPassphrase--;
- break;
-
- case 'EXPSIG':
- case 'EXPKEYSIG':
- case 'REVKEYSIG':
- case 'BADSIG':
- $this->_errorCode = Crypt_GPG::ERROR_BAD_SIGNATURE;
- break;
-
- }
- }
-
- // }}}
- // {{{ _handleErrorError()
-
- /**
- * Handles error values in the error output from GPG
- *
- * This method is responsible for setting the
- * {@link Crypt_GPG_Engine::$_errorCode}.
- *
- * @param string $line the error line to handle.
- *
- * @return void
- */
- private function _handleErrorError($line)
- {
- if ($this->_errorCode === Crypt_GPG::ERROR_NONE) {
- $pattern = '/no valid OpenPGP data found/';
- if (preg_match($pattern, $line) === 1) {
- $this->_errorCode = Crypt_GPG::ERROR_NO_DATA;
- }
- }
-
- if ($this->_errorCode === Crypt_GPG::ERROR_NONE) {
- $pattern = '/No secret key|secret key not available/';
- if (preg_match($pattern, $line) === 1) {
- $this->_errorCode = Crypt_GPG::ERROR_KEY_NOT_FOUND;
- }
- }
-
- if ($this->_errorCode === Crypt_GPG::ERROR_NONE) {
- $pattern = '/No public key|public key not found/';
- if (preg_match($pattern, $line) === 1) {
- $this->_errorCode = Crypt_GPG::ERROR_KEY_NOT_FOUND;
- }
- }
-
- if ($this->_errorCode === Crypt_GPG::ERROR_NONE) {
- $matches = array();
- $pattern = '/can\'t (?:access|open) `(.*?)\'/';
- if (preg_match($pattern, $line, $matches) === 1) {
- $this->_errorFilename = $matches[1];
- $this->_errorCode = Crypt_GPG::ERROR_FILE_PERMISSIONS;
- }
- }
- }
-
- // }}}
- // {{{ _handleDebugStatus()
-
- /**
- * Displays debug output for status lines
- *
- * @param string $line the status line to handle.
- *
- * @return void
- */
- private function _handleDebugStatus($line)
- {
- $this->_debug('STATUS: ' . $line);
- }
-
- // }}}
- // {{{ _handleDebugError()
-
- /**
- * Displays debug output for error lines
- *
- * @param string $line the error line to handle.
- *
- * @return void
- */
- private function _handleDebugError($line)
- {
- $this->_debug('ERROR: ' . $line);
- }
-
- // }}}
- // {{{ _process()
-
- /**
- * Performs internal streaming operations for the subprocess using either
- * strings or streams as input / output points
- *
- * This is the main I/O loop for streaming to and from the GPG subprocess.
- *
- * The implementation of this method is verbose mainly for performance
- * reasons. Adding streams to a lookup array and looping the array inside
- * the main I/O loop would be siginficantly slower for large streams.
- *
- * @return void
- *
- * @throws Crypt_GPG_Exception if there is an error selecting streams for
- * reading or writing. If this occurs, please file a bug report at
- * http://pear.php.net/bugs/report.php?package=Crypt_GPG.
- */
- private function _process()
- {
- $this->_debug('BEGIN PROCESSING');
-
- $this->_commandBuffer = ''; // buffers input to GPG
- $messageBuffer = ''; // buffers input to GPG
- $inputBuffer = ''; // buffers input to GPG
- $outputBuffer = ''; // buffers output from GPG
- $statusBuffer = ''; // buffers output from GPG
- $errorBuffer = ''; // buffers output from GPG
- $inputComplete = false; // input stream is completely buffered
- $messageComplete = false; // message stream is completely buffered
-
- if (is_string($this->_input)) {
- $inputBuffer = $this->_input;
- $inputComplete = true;
- }
-
- if (is_string($this->_message)) {
- $messageBuffer = $this->_message;
- $messageComplete = true;
- }
-
- if (is_string($this->_output)) {
- $outputBuffer =& $this->_output;
- }
-
- // convenience variables
- $fdInput = $this->_pipes[self::FD_INPUT];
- $fdOutput = $this->_pipes[self::FD_OUTPUT];
- $fdError = $this->_pipes[self::FD_ERROR];
- $fdStatus = $this->_pipes[self::FD_STATUS];
- $fdCommand = $this->_pipes[self::FD_COMMAND];
- $fdMessage = $this->_pipes[self::FD_MESSAGE];
-
- while (true) {
-
- $inputStreams = array();
- $outputStreams = array();
- $exceptionStreams = array();
-
- // set up input streams
- if (is_resource($this->_input) && !$inputComplete) {
- if (feof($this->_input)) {
- $inputComplete = true;
- } else {
- $inputStreams[] = $this->_input;
- }
- }
-
- // close GPG input pipe if there is no more data
- if ($inputBuffer == '' && $inputComplete) {
- $this->_debug('=> closing GPG input pipe');
- $this->_closePipe(self::FD_INPUT);
- }
-
- if (is_resource($this->_message) && !$messageComplete) {
- if (feof($this->_message)) {
- $messageComplete = true;
- } else {
- $inputStreams[] = $this->_message;
- }
- }
-
- // close GPG message pipe if there is no more data
- if ($messageBuffer == '' && $messageComplete) {
- $this->_debug('=> closing GPG message pipe');
- $this->_closePipe(self::FD_MESSAGE);
- }
-
- if (!feof($fdOutput)) {
- $inputStreams[] = $fdOutput;
- }
-
- if (!feof($fdStatus)) {
- $inputStreams[] = $fdStatus;
- }
-
- if (!feof($fdError)) {
- $inputStreams[] = $fdError;
- }
-
- // set up output streams
- if ($outputBuffer != '' && is_resource($this->_output)) {
- $outputStreams[] = $this->_output;
- }
-
- if ($this->_commandBuffer != '') {
- $outputStreams[] = $fdCommand;
- }
-
- if ($messageBuffer != '') {
- $outputStreams[] = $fdMessage;
- }
-
- if ($inputBuffer != '') {
- $outputStreams[] = $fdInput;
- }
-
- // no streams left to read or write, we're all done
- if (count($inputStreams) === 0 && count($outputStreams) === 0) {
- break;
- }
-
- $this->_debug('selecting streams');
-
- $ready = stream_select(
- $inputStreams,
- $outputStreams,
- $exceptionStreams,
- null
- );
-
- $this->_debug('=> got ' . $ready);
-
- if ($ready === false) {
- throw new Crypt_GPG_Exception(
- 'Error selecting stream for communication with GPG ' .
- 'subprocess. Please file a bug report at: ' .
- 'http://pear.php.net/bugs/report.php?package=Crypt_GPG');
- }
-
- if ($ready === 0) {
- throw new Crypt_GPG_Exception(
- 'stream_select() returned 0. This can not happen! Please ' .
- 'file a bug report at: ' .
- 'http://pear.php.net/bugs/report.php?package=Crypt_GPG');
- }
-
- // write input (to GPG)
- if (in_array($fdInput, $outputStreams)) {
- $this->_debug('GPG is ready for input');
-
- $chunk = self::_byteSubstring(
- $inputBuffer,
- 0,
- self::CHUNK_SIZE
- );
-
- $length = self::_byteLength($chunk);
-
- $this->_debug(
- '=> about to write ' . $length . ' bytes to GPG input'
- );
-
- $length = fwrite($fdInput, $chunk, $length);
-
- $this->_debug('=> wrote ' . $length . ' bytes');
-
- $inputBuffer = self::_byteSubstring(
- $inputBuffer,
- $length
- );
- }
-
- // read input (from PHP stream)
- if (in_array($this->_input, $inputStreams)) {
- $this->_debug('input stream is ready for reading');
- $this->_debug(
- '=> about to read ' . self::CHUNK_SIZE .
- ' bytes from input stream'
- );
-
- $chunk = fread($this->_input, self::CHUNK_SIZE);
- $length = self::_byteLength($chunk);
- $inputBuffer .= $chunk;
-
- $this->_debug('=> read ' . $length . ' bytes');
- }
-
- // write message (to GPG)
- if (in_array($fdMessage, $outputStreams)) {
- $this->_debug('GPG is ready for message data');
-
- $chunk = self::_byteSubstring(
- $messageBuffer,
- 0,
- self::CHUNK_SIZE
- );
-
- $length = self::_byteLength($chunk);
-
- $this->_debug(
- '=> about to write ' . $length . ' bytes to GPG message'
- );
-
- $length = fwrite($fdMessage, $chunk, $length);
- $this->_debug('=> wrote ' . $length . ' bytes');
-
- $messageBuffer = self::_byteSubstring($messageBuffer, $length);
- }
-
- // read message (from PHP stream)
- if (in_array($this->_message, $inputStreams)) {
- $this->_debug('message stream is ready for reading');
- $this->_debug(
- '=> about to read ' . self::CHUNK_SIZE .
- ' bytes from message stream'
- );
-
- $chunk = fread($this->_message, self::CHUNK_SIZE);
- $length = self::_byteLength($chunk);
- $messageBuffer .= $chunk;
-
- $this->_debug('=> read ' . $length . ' bytes');
- }
-
- // read output (from GPG)
- if (in_array($fdOutput, $inputStreams)) {
- $this->_debug('GPG output stream ready for reading');
- $this->_debug(
- '=> about to read ' . self::CHUNK_SIZE .
- ' bytes from GPG output'
- );
-
- $chunk = fread($fdOutput, self::CHUNK_SIZE);
- $length = self::_byteLength($chunk);
- $outputBuffer .= $chunk;
-
- $this->_debug('=> read ' . $length . ' bytes');
- }
-
- // write output (to PHP stream)
- if (in_array($this->_output, $outputStreams)) {
- $this->_debug('output stream is ready for data');
-
- $chunk = self::_byteSubstring(
- $outputBuffer,
- 0,
- self::CHUNK_SIZE
- );
-
- $length = self::_byteLength($chunk);
-
- $this->_debug(
- '=> about to write ' . $length . ' bytes to output stream'
- );
-
- $length = fwrite($this->_output, $chunk, $length);
-
- $this->_debug('=> wrote ' . $length . ' bytes');
-
- $outputBuffer = self::_byteSubstring($outputBuffer, $length);
- }
-
- // read error (from GPG)
- if (in_array($fdError, $inputStreams)) {
- $this->_debug('GPG error stream ready for reading');
- $this->_debug(
- '=> about to read ' . self::CHUNK_SIZE .
- ' bytes from GPG error'
- );
-
- $chunk = fread($fdError, self::CHUNK_SIZE);
- $length = self::_byteLength($chunk);
- $errorBuffer .= $chunk;
-
- $this->_debug('=> read ' . $length . ' bytes');
-
- // pass lines to error handlers
- while (($pos = strpos($errorBuffer, PHP_EOL)) !== false) {
- $line = self::_byteSubstring($errorBuffer, 0, $pos);
- foreach ($this->_errorHandlers as $handler) {
- array_unshift($handler['args'], $line);
- call_user_func_array(
- $handler['callback'],
- $handler['args']
- );
-
- array_shift($handler['args']);
- }
- $errorBuffer = self::_byteSubString(
- $errorBuffer,
- $pos + self::_byteLength(PHP_EOL)
- );
- }
- }
-
- // read status (from GPG)
- if (in_array($fdStatus, $inputStreams)) {
- $this->_debug('GPG status stream ready for reading');
- $this->_debug(
- '=> about to read ' . self::CHUNK_SIZE .
- ' bytes from GPG status'
- );
-
- $chunk = fread($fdStatus, self::CHUNK_SIZE);
- $length = self::_byteLength($chunk);
- $statusBuffer .= $chunk;
-
- $this->_debug('=> read ' . $length . ' bytes');
-
- // pass lines to status handlers
- while (($pos = strpos($statusBuffer, PHP_EOL)) !== false) {
- $line = self::_byteSubstring($statusBuffer, 0, $pos);
- // only pass lines beginning with magic prefix
- if (self::_byteSubstring($line, 0, 9) == '[GNUPG:] ') {
- $line = self::_byteSubstring($line, 9);
- foreach ($this->_statusHandlers as $handler) {
- array_unshift($handler['args'], $line);
- call_user_func_array(
- $handler['callback'],
- $handler['args']
- );
-
- array_shift($handler['args']);
- }
- }
- $statusBuffer = self::_byteSubString(
- $statusBuffer,
- $pos + self::_byteLength(PHP_EOL)
- );
- }
- }
-
- // write command (to GPG)
- if (in_array($fdCommand, $outputStreams)) {
- $this->_debug('GPG is ready for command data');
-
- // send commands
- $chunk = self::_byteSubstring(
- $this->_commandBuffer,
- 0,
- self::CHUNK_SIZE
- );
-
- $length = self::_byteLength($chunk);
-
- $this->_debug(
- '=> about to write ' . $length . ' bytes to GPG command'
- );
-
- $length = fwrite($fdCommand, $chunk, $length);
-
- $this->_debug('=> wrote ' . $length);
-
- $this->_commandBuffer = self::_byteSubstring(
- $this->_commandBuffer,
- $length
- );
- }
-
- } // end loop while streams are open
-
- $this->_debug('END PROCESSING');
- }
-
- // }}}
- // {{{ _openSubprocess()
-
- /**
- * Opens an internal GPG subprocess for the current operation
- *
- * Opens a GPG subprocess, then connects the subprocess to some pipes. Sets
- * the private class property {@link Crypt_GPG_Engine::$_process} to
- * the new subprocess.
- *
- * @return void
- *
- * @throws Crypt_GPG_OpenSubprocessException if the subprocess could not be
- * opened.
- *
- * @see Crypt_GPG_Engine::setOperation()
- * @see Crypt_GPG_Engine::_closeSubprocess()
- * @see Crypt_GPG_Engine::$_process
- */
- private function _openSubprocess()
- {
- $version = $this->getVersion();
-
- $env = $_ENV;
-
- // Newer versions of GnuPG return localized results. Crypt_GPG only
- // works with English, so set the locale to 'C' for the subprocess.
- $env['LC_ALL'] = 'C';
-
- $commandLine = $this->_binary;
-
- $defaultArguments = array(
- '--status-fd ' . escapeshellarg(self::FD_STATUS),
- '--command-fd ' . escapeshellarg(self::FD_COMMAND),
- '--no-secmem-warning',
- '--no-tty',
- '--no-default-keyring', // ignored if keying files are not specified
- '--no-options' // prevent creation of ~/.gnupg directory
- );
-
- if (version_compare($version, '1.0.7', 'ge')) {
- if (version_compare($version, '2.0.0', 'lt')) {
- $defaultArguments[] = '--no-use-agent';
- }
- $defaultArguments[] = '--no-permission-warning';
- }
-
- if (version_compare($version, '1.4.2', 'ge')) {
- $defaultArguments[] = '--exit-on-status-write-error';
- }
-
- if (version_compare($version, '1.3.2', 'ge')) {
- $defaultArguments[] = '--trust-model always';
- } else {
- $defaultArguments[] = '--always-trust';
- }
-
- $arguments = array_merge($defaultArguments, $this->_arguments);
-
- if ($this->_homedir) {
- $arguments[] = '--homedir ' . escapeshellarg($this->_homedir);
-
- // the random seed file makes subsequent actions faster so only
- // disable it if we have to.
- if (!is_writeable($this->_homedir)) {
- $arguments[] = '--no-random-seed-file';
- }
- }
-
- if ($this->_publicKeyring) {
- $arguments[] = '--keyring ' . escapeshellarg($this->_publicKeyring);
- }
-
- if ($this->_privateKeyring) {
- $arguments[] = '--secret-keyring ' .
- escapeshellarg($this->_privateKeyring);
- }
-
- if ($this->_trustDb) {
- $arguments[] = '--trustdb-name ' . escapeshellarg($this->_trustDb);
- }
-
- $commandLine .= ' ' . implode(' ', $arguments) . ' ' .
- $this->_operation;
-
- // Binary operations will not work on Windows with PHP < 5.2.6. This is
- // in case stream_select() ever works on Windows.
- $rb = (version_compare(PHP_VERSION, '5.2.6') < 0) ? 'r' : 'rb';
- $wb = (version_compare(PHP_VERSION, '5.2.6') < 0) ? 'w' : 'wb';
-
- $descriptorSpec = array(
- self::FD_INPUT => array('pipe', $rb), // stdin
- self::FD_OUTPUT => array('pipe', $wb), // stdout
- self::FD_ERROR => array('pipe', $wb), // stderr
- self::FD_STATUS => array('pipe', $wb), // status
- self::FD_COMMAND => array('pipe', $rb), // command
- self::FD_MESSAGE => array('pipe', $rb) // message
- );
-
- $this->_debug('OPENING SUBPROCESS WITH THE FOLLOWING COMMAND:');
- $this->_debug($commandLine);
-
- $this->_process = proc_open(
- $commandLine,
- $descriptorSpec,
- $this->_pipes,
- null,
- $env,
- array('binary_pipes' => true)
- );
-
- if (!is_resource($this->_process)) {
- throw new Crypt_GPG_OpenSubprocessException(
- 'Unable to open GPG subprocess.', 0, $commandLine);
- }
-
- $this->_openPipes = $this->_pipes;
- $this->_errorCode = Crypt_GPG::ERROR_NONE;
- }
-
- // }}}
- // {{{ _closeSubprocess()
-
- /**
- * Closes a the internal GPG subprocess
- *
- * Closes the internal GPG subprocess. Sets the private class property
- * {@link Crypt_GPG_Engine::$_process} to null.
- *
- * @return void
- *
- * @see Crypt_GPG_Engine::_openSubprocess()
- * @see Crypt_GPG_Engine::$_process
- */
- private function _closeSubprocess()
- {
- if (is_resource($this->_process)) {
- $this->_debug('CLOSING SUBPROCESS');
-
- // close remaining open pipes
- foreach (array_keys($this->_openPipes) as $pipeNumber) {
- $this->_closePipe($pipeNumber);
- }
-
- $exitCode = proc_close($this->_process);
-
- if ($exitCode != 0) {
- $this->_debug(
- '=> subprocess returned an unexpected exit code: ' .
- $exitCode
- );
-
- if ($this->_errorCode === Crypt_GPG::ERROR_NONE) {
- if ($this->_needPassphrase > 0) {
- $this->_errorCode = Crypt_GPG::ERROR_MISSING_PASSPHRASE;
- } else {
- $this->_errorCode = Crypt_GPG::ERROR_UNKNOWN;
- }
- }
- }
-
- $this->_process = null;
- $this->_pipes = array();
- }
- }
-
- // }}}
- // {{{ _closePipe()
-
- /**
- * Closes an opened pipe used to communicate with the GPG subprocess
- *
- * If the pipe is already closed, it is ignored. If the pipe is open, it
- * is flushed and then closed.
- *
- * @param integer $pipeNumber the file descriptor number of the pipe to
- * close.
- *
- * @return void
- */
- private function _closePipe($pipeNumber)
- {
- $pipeNumber = intval($pipeNumber);
- if (array_key_exists($pipeNumber, $this->_openPipes)) {
- fflush($this->_openPipes[$pipeNumber]);
- fclose($this->_openPipes[$pipeNumber]);
- unset($this->_openPipes[$pipeNumber]);
- }
- }
-
- // }}}
- // {{{ _getBinary()
-
- /**
- * Gets the name of the GPG binary for the current operating system
- *
- * This method is called if the '<kbd>binary</kbd>' option is <i>not</i>
- * specified when creating this driver.
- *
- * @return string the name of the GPG binary for the current operating
- * system. If no suitable binary could be found, an empty
- * string is returned.
- */
- private function _getBinary()
- {
- $binary = '';
-
- if ($this->_isDarwin) {
- $binaryFiles = array(
- '/opt/local/bin/gpg', // MacPorts
- '/usr/local/bin/gpg', // Mac GPG
- '/sw/bin/gpg', // Fink
- '/usr/bin/gpg'
- );
- } else {
- $binaryFiles = array(
- '/usr/bin/gpg',
- '/usr/local/bin/gpg'
- );
- }
-
- foreach ($binaryFiles as $binaryFile) {
- if (is_executable($binaryFile)) {
- $binary = $binaryFile;
- break;
- }
- }
-
- return $binary;
- }
-
- // }}}
- // {{{ _debug()
-
- /**
- * Displays debug text if debugging is turned on
- *
- * Debugging text is prepended with a debug identifier and echoed to stdout.
- *
- * @param string $text the debugging text to display.
- *
- * @return void
- */
- private function _debug($text)
- {
- if ($this->_debug) {
- if (array_key_exists('SHELL', $_ENV)) {
- foreach (explode(PHP_EOL, $text) as $line) {
- echo "Crypt_GPG DEBUG: ", $line, PHP_EOL;
- }
- } else {
- // running on a web server, format debug output nicely
- foreach (explode(PHP_EOL, $text) as $line) {
- echo "Crypt_GPG DEBUG: <strong>", $line,
- '</strong><br />', PHP_EOL;
- }
- }
- }
- }
-
- // }}}
- // {{{ _byteLength()
-
- /**
- * Gets the length of a string in bytes even if mbstring function
- * overloading is turned on
- *
- * This is used for stream-based communication with the GPG subprocess.
- *
- * @param string $string the string for which to get the length.
- *
- * @return integer the length of the string in bytes.
- *
- * @see Crypt_GPG_Engine::$_mbStringOverload
- */
- private static function _byteLength($string)
- {
- if (self::$_mbStringOverload) {
- return mb_strlen($string, '8bit');
- }
-
- return strlen((binary)$string);
- }
-
- // }}}
- // {{{ _byteSubstring()
-
- /**
- * Gets the substring of a string in bytes even if mbstring function
- * overloading is turned on
- *
- * This is used for stream-based communication with the GPG subprocess.
- *
- * @param string $string the input string.
- * @param integer $start the starting point at which to get the substring.
- * @param integer $length optional. The length of the substring.
- *
- * @return string the extracted part of the string. Unlike the default PHP
- * <kbd>substr()</kbd> function, the returned value is
- * always a string and never false.
- *
- * @see Crypt_GPG_Engine::$_mbStringOverload
- */
- private static function _byteSubstring($string, $start, $length = null)
- {
- if (self::$_mbStringOverload) {
- if ($length === null) {
- return mb_substr(
- $string,
- $start,
- self::_byteLength($string) - $start, '8bit'
- );
- }
-
- return mb_substr($string, $start, $length, '8bit');
- }
-
- if ($length === null) {
- return (string)substr((binary)$string, $start);
- }
-
- return (string)substr((binary)$string, $start, $length);
- }
-
- // }}}
-}
-
-// }}}
-
-?>
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