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-<?php
-/**
- * Crypt_RSA allows to do following operations:
- * - key pair generation
- * - encryption and decryption
- * - signing and sign validation
- *
- * PHP versions 4 and 5
- *
- * LICENSE: This source file is subject to version 3.0 of the PHP license
- * that is available through the world-wide-web at the following URI:
- * http://www.php.net/license/3_0.txt. If you did not receive a copy of
- * the PHP License and are unable to obtain it through the web, please
- * send a note to license@php.net so we can mail you a copy immediately.
- *
- * @category Encryption
- * @package Crypt_RSA
- * @author Alexander Valyalkin <valyala@gmail.com>
- * @copyright 2005 Alexander Valyalkin
- * @license http://www.php.net/license/3_0.txt PHP License 3.0
- * @version CVS: $Id: Key.php,v 1.6 2009/01/05 08:30:29 clockwerx Exp $
- * @link http://pear.php.net/package/Crypt_RSA
- */
-
-/**
- * RSA error handling facilities
- */
-require_once 'Crypt/RSA/ErrorHandler.php';
-
-/**
- * loader for RSA math wrappers
- */
-require_once 'Crypt/RSA/MathLoader.php';
-
-/**
- * Crypt_RSA_Key class, derived from Crypt_RSA_ErrorHandler
- *
- * Provides the following functions:
- * - getKeyLength() - returns bit key length
- * - getExponent() - returns key exponent as binary string
- * - getModulus() - returns key modulus as binary string
- * - getKeyType() - returns type of the key (public or private)
- * - toString() - returns serialized key as string
- * - fromString($key_str) - static function; returns key, unserialized from string
- * - isValid($key) - static function for validating of $key
- *
- * Example usage:
- * // create new 1024-bit key pair
- * $key_pair = new Crypt_RSA_KeyPair(1024);
- *
- * // get public key (its class is Crypt_RSA_Key)
- * $key = $key_pair->getPublicKey();
- *
- * // get key length
- * $len = $key->getKeyLength();
- *
- * // get modulus as string
- * $modulus = $key->getModulus();
- *
- * // get exponent as string
- * $exponent = $key->getExponent();
- *
- * // get string represenation of key (use it instead of serialization of Crypt_RSA_Key object)
- * $key_in_str = $key->toString();
- *
- * // restore key object from string using 'BigInt' math wrapper
- * $key = Crypt_RSA_Key::fromString($key_in_str, 'BigInt');
- *
- * // error check
- * if ($key->isError()) {
- * echo "error while unserializing key object:\n";
- * $erorr = $key->getLastError();
- * echo $error->getMessage(), "\n";
- * }
- *
- * // validate key
- * if (Crypt_RSA_Key::isValid($key)) echo 'valid key';
- * else echo 'invalid key';
- *
- * // using factory() method instead of constructor (it returns PEAR_Error object on failure)
- * $rsa_obj = &Crypt_RSA_Key::factory($modulus, $exp, $key_type);
- * if (PEAR::isError($rsa_obj)) {
- * echo "error: ", $rsa_obj->getMessage(), "\n";
- * }
- *
- * @category Encryption
- * @package Crypt_RSA
- * @author Alexander Valyalkin <valyala@gmail.com>
- * @copyright 2005 Alexander Valyalkin
- * @license http://www.php.net/license/3_0.txt PHP License 3.0
- * @version Release: @package_version@
- * @link http://pear.php.net/package/Crypt_RSA
- * @access public
- */
-class Crypt_RSA_Key extends Crypt_RSA_ErrorHandler
-{
- /**
- * Reference to math wrapper object, which is used to
- * manipulate large integers in RSA algorithm.
- *
- * @var object of Crypt_RSA_Math_* class
- * @access private
- */
- var $_math_obj;
-
- /**
- * shared modulus
- *
- * @var string
- * @access private
- */
- var $_modulus;
-
- /**
- * exponent
- *
- * @var string
- * @access private
- */
- var $_exp;
-
- /**
- * key type (private or public)
- *
- * @var string
- * @access private
- */
- var $_key_type;
-
- /**
- * key length in bits
- *
- * @var int
- * @access private
- */
- var $_key_len;
-
- /**
- * Crypt_RSA_Key constructor.
- *
- * You should pass in the name of math wrapper, which will be used to
- * perform different operations with big integers.
- * See contents of Crypt/RSA/Math folder for examples of wrappers.
- * Read docs/Crypt_RSA/docs/math_wrappers.txt for details.
- *
- * @param string $modulus key modulus
- * @param string $exp key exponent
- * @param string $key_type type of the key (public or private)
- * @param string $wrapper_name wrapper to use
- * @param string $error_handler name of error handler function
- *
- * @access public
- */
- function Crypt_RSA_Key($modulus, $exp, $key_type, $wrapper_name = 'default', $error_handler = '')
- {
- // set error handler
- $this->setErrorHandler($error_handler);
- // try to load math wrapper $wrapper_name
- $obj = &Crypt_RSA_MathLoader::loadWrapper($wrapper_name);
- if ($this->isError($obj)) {
- // error during loading of math wrapper
- $this->pushError($obj); // push error object into error list
- return;
- }
- $this->_math_obj = &$obj;
-
- $this->_modulus = $modulus;
- $this->_exp = $exp;
-
- if (!in_array($key_type, array('private', 'public'))) {
- $this->pushError('invalid key type. It must be private or public', CRYPT_RSA_ERROR_WRONG_KEY_TYPE);
- return;
- }
- $this->_key_type = $key_type;
-
- /* check length of modulus & exponent ( abs(modulus) > abs(exp) ) */
- $mod_num = $this->_math_obj->bin2int($this->_modulus);
- $exp_num = $this->_math_obj->bin2int($this->_exp);
-
- if ($this->_math_obj->cmpAbs($mod_num, $exp_num) <= 0) {
- $this->pushError('modulus must be greater than exponent', CRYPT_RSA_ERROR_EXP_GE_MOD);
- return;
- }
-
- // determine key length
- $this->_key_len = $this->_math_obj->bitLen($mod_num);
- }
-
- /**
- * Crypt_RSA_Key factory.
- *
- * @param string $modulus key modulus
- * @param string $exp key exponent
- * @param string $key_type type of the key (public or private)
- * @param string $wrapper_name wrapper to use
- * @param string $error_handler name of error handler function
- *
- * @return object new Crypt_RSA_Key object on success or PEAR_Error object on failure
- * @access public
- */
- function factory($modulus, $exp, $key_type, $wrapper_name = 'default', $error_handler = '')
- {
- $obj = new Crypt_RSA_Key($modulus, $exp, $key_type, $wrapper_name, $error_handler);
- if ($obj->isError()) {
- // error during creating a new object. Retrurn PEAR_Error object
- return $obj->getLastError();
- }
- // object created successfully. Return it
- return $obj;
- }
-
- /**
- * Calculates bit length of the key
- *
- * @return int bit length of key
- * @access public
- */
- function getKeyLength()
- {
- return $this->_key_len;
- }
-
- /**
- * Returns modulus part of the key as binary string,
- * which can be used to construct new Crypt_RSA_Key object.
- *
- * @return string modulus as binary string
- * @access public
- */
- function getModulus()
- {
- return $this->_modulus;
- }
-
- /**
- * Returns exponent part of the key as binary string,
- * which can be used to construct new Crypt_RSA_Key object.
- *
- * @return string exponent as binary string
- * @access public
- */
- function getExponent()
- {
- return $this->_exp;
- }
-
- /**
- * Returns key type (public, private)
- *
- * @return string key type (public, private)
- * @access public
- */
- function getKeyType()
- {
- return $this->_key_type;
- }
-
- /**
- * Returns string representation of key
- *
- * @return string key, serialized to string
- * @access public
- */
- function toString()
- {
- return base64_encode(
- serialize(
- array($this->_modulus, $this->_exp, $this->_key_type)
- )
- );
- }
-
- /**
- * Returns Crypt_RSA_Key object, unserialized from
- * string representation of key.
- *
- * optional parameter $wrapper_name - is the name of math wrapper,
- * which will be used during unserialization of this object.
- *
- * This function can be called statically:
- * $key = Crypt_RSA_Key::fromString($key_in_string, 'BigInt');
- *
- * @param string $key_str RSA key, serialized into string
- * @param string $wrapper_name optional math wrapper name
- *
- * @return object key as Crypt_RSA_Key object
- * @access public
- * @static
- */
- function fromString($key_str, $wrapper_name = 'default')
- {
- list($modulus, $exponent, $key_type) = unserialize(base64_decode($key_str));
- $obj = new Crypt_RSA_Key($modulus, $exponent, $key_type, $wrapper_name);
- return $obj;
- }
-
- /**
- * Validates key
- * This function can be called statically:
- * $is_valid = Crypt_RSA_Key::isValid($key)
- *
- * Returns true, if $key is valid Crypt_RSA key, else returns false
- *
- * @param object $key Crypt_RSA_Key object for validating
- *
- * @return bool true if $key is valid, else false
- * @access public
- */
- function isValid($key)
- {
- return (is_object($key) && strtolower(get_class($key)) === strtolower(__CLASS__));
- }
-}
-
-?>
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