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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, 2006 Alexander Valyalkin
- * @license http://www.php.net/license/3_0.txt PHP License 3.0
- * @version 1.2.0b
- * @link http://pear.php.net/package/Crypt_RSA
- */
-
-/**
- * RSA error handling facilities
- */
-require_once 'Crypt/RSA/ErrorHandler.php';
-
-/**
- * loader for math wrappers
- */
-require_once 'Crypt/RSA/MathLoader.php';
-
-/**
- * helper class for mange single key
- */
-require_once 'Crypt/RSA/Key.php';
-
-/**
- * helper class for manage key pair
- */
-require_once 'Crypt/RSA/KeyPair.php';
-
-/**
- * Crypt_RSA class, derived from Crypt_RSA_ErrorHandler
- *
- * Provides the following functions:
- * - setParams($params) - sets parameters of current object
- * - encrypt($plain_data, $key = null) - encrypts data
- * - decrypt($enc_data, $key = null) - decrypts data
- * - createSign($doc, $private_key = null) - signs document by private key
- * - validateSign($doc, $signature, $public_key = null) - validates signature of document
- *
- * Example usage:
- * // creating an error handler
- * $error_handler = create_function('$obj', 'echo "error: ", $obj->getMessage(), "\n"');
- *
- * // 1024-bit key pair generation
- * $key_pair = new Crypt_RSA_KeyPair(1024);
- *
- * // check consistence of Crypt_RSA_KeyPair object
- * $error_handler($key_pair);
- *
- * // creating Crypt_RSA object
- * $rsa_obj = new Crypt_RSA;
- *
- * // check consistence of Crypt_RSA object
- * $error_handler($rsa_obj);
- *
- * // set error handler on Crypt_RSA object ( see Crypt/RSA/ErrorHandler.php for details )
- * $rsa_obj->setErrorHandler($error_handler);
- *
- * // encryption (usually using public key)
- * $enc_data = $rsa_obj->encrypt($plain_data, $key_pair->getPublicKey());
- *
- * // decryption (usually using private key)
- * $plain_data = $rsa_obj->decrypt($enc_data, $key_pair->getPrivateKey());
- *
- * // signing
- * $signature = $rsa_obj->createSign($document, $key_pair->getPrivateKey());
- *
- * // signature checking
- * $is_valid = $rsa_obj->validateSign($document, $signature, $key_pair->getPublicKey());
- *
- * // signing many documents by one private key
- * $rsa_obj = new Crypt_RSA(array('private_key' => $key_pair->getPrivateKey()));
- * // check consistence of Crypt_RSA object
- * $error_handler($rsa_obj);
- * // set error handler ( see Crypt/RSA/ErrorHandler.php for details )
- * $rsa_obj->setErrorHandler($error_handler);
- * // sign many documents
- * $sign_1 = $rsa_obj->sign($doc_1);
- * $sign_2 = $rsa_obj->sign($doc_2);
- * //...
- * $sign_n = $rsa_obj->sign($doc_n);
- *
- * // changing default hash function, which is used for sign
- * // creating/validation
- * $rsa_obj->setParams(array('hash_func' => 'md5'));
- *
- * // using factory() method instead of constructor (it returns PEAR_Error object on failure)
- * $rsa_obj = &Crypt_RSA::factory();
- * if (PEAR::isError($rsa_obj)) {
- * echo "error: ", $rsa_obj->getMessage(), "\n";
- * }
- *
- * @category Encryption
- * @package Crypt_RSA
- * @author Alexander Valyalkin <valyala@gmail.com>
- * @copyright 2005, 2006 Alexander Valyalkin
- * @license http://www.php.net/license/3_0.txt PHP License 3.0
- * @link http://pear.php.net/package/Crypt_RSA
- * @version @package_version@
- * @access public
- */
-class Crypt_RSA extends Crypt_RSA_ErrorHandler
-{
- /**
- * Reference to math wrapper, which is used to
- * manipulate large integers in RSA algorithm.
- *
- * @var object of Crypt_RSA_Math_* class
- * @access private
- */
- var $_math_obj;
-
- /**
- * key for encryption, which is used by encrypt() method
- *
- * @var object of Crypt_RSA_KEY class
- * @access private
- */
- var $_enc_key;
-
- /**
- * key for decryption, which is used by decrypt() method
- *
- * @var object of Crypt_RSA_KEY class
- * @access private
- */
- var $_dec_key;
-
- /**
- * public key, which is used by validateSign() method
- *
- * @var object of Crypt_RSA_KEY class
- * @access private
- */
- var $_public_key;
-
- /**
- * private key, which is used by createSign() method
- *
- * @var object of Crypt_RSA_KEY class
- * @access private
- */
- var $_private_key;
-
- /**
- * name of hash function, which is used by validateSign()
- * and createSign() methods. Default hash function is SHA-1
- *
- * @var string
- * @access private
- */
- var $_hash_func = 'sha1';
-
- /**
- * Crypt_RSA constructor.
- *
- * @param array $params
- * Optional associative array of parameters, such as:
- * enc_key, dec_key, private_key, public_key, hash_func.
- * See setParams() method for more detailed description of
- * these parameters.
- * @param string $wrapper_name
- * 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 $error_handler name of error handler function
- *
- * @access public
- */
- function Crypt_RSA($params = null, $wrapper_name = 'default', $error_handler = '')
- {
- // set error handler
- $this->setErrorHandler($error_handler);
- // try to load math wrapper
- $obj = &Crypt_RSA_MathLoader::loadWrapper($wrapper_name);
- if ($this->isError($obj)) {
- // error during loading of math wrapper
- // Crypt_RSA object is partially constructed.
- $this->pushError($obj);
- return;
- }
- $this->_math_obj = &$obj;
-
- if (!is_null($params)) {
- if (!$this->setParams($params)) {
- // error in Crypt_RSA::setParams() function
- return;
- }
- }
- }
-
- /**
- * Crypt_RSA factory.
- *
- * @param array $params
- * Optional associative array of parameters, such as:
- * enc_key, dec_key, private_key, public_key, hash_func.
- * See setParams() method for more detailed description of
- * these parameters.
- * @param string $wrapper_name
- * 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 $error_handler name of error handler function
- *
- * @return object new Crypt_RSA object on success or PEAR_Error object on failure
- * @access public
- */
- function &factory($params = null, $wrapper_name = 'default', $error_handler = '')
- {
- $obj = &new Crypt_RSA($params, $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;
- }
-
- /**
- * Accepts any combination of available parameters as associative array:
- * enc_key - encryption key for encrypt() method
- * dec_key - decryption key for decrypt() method
- * public_key - key for validateSign() method
- * private_key - key for createSign() method
- * hash_func - name of hash function, which will be used to create and validate sign
- *
- * @param array $params
- * associative array of permitted parameters (see above)
- *
- * @return bool true on success or false on error
- * @access public
- */
- function setParams($params)
- {
- if (!is_array($params)) {
- $this->pushError('parameters must be passed to function as associative array', CRYPT_RSA_ERROR_WRONG_PARAMS);
- return false;
- }
-
- if (isset($params['enc_key'])) {
- if (Crypt_RSA_Key::isValid($params['enc_key'])) {
- $this->_enc_key = $params['enc_key'];
- }
- else {
- $this->pushError('wrong encryption key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
- return false;
- }
- }
- if (isset($params['dec_key'])) {
- if (Crypt_RSA_Key::isValid($params['dec_key'])) {
- $this->_dec_key = $params['dec_key'];
- }
- else {
- $this->pushError('wrong decryption key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
- return false;
- }
- }
- if (isset($params['private_key'])) {
- if (Crypt_RSA_Key::isValid($params['private_key'])) {
- if ($params['private_key']->getKeyType() != 'private') {
- $this->pushError('private key must have "private" attribute', CRYPT_RSA_ERROR_WRONG_KEY_TYPE);
- return false;
- }
- $this->_private_key = $params['private_key'];
- }
- else {
- $this->pushError('wrong private key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
- return false;
- }
- }
- if (isset($params['public_key'])) {
- if (Crypt_RSA_Key::isValid($params['public_key'])) {
- if ($params['public_key']->getKeyType() != 'public') {
- $this->pushError('public key must have "public" attribute', CRYPT_RSA_ERROR_WRONG_KEY_TYPE);
- return false;
- }
- $this->_public_key = $params['public_key'];
- }
- else {
- $this->pushError('wrong public key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
- return false;
- }
- }
- if (isset($params['hash_func'])) {
- if (!function_exists($params['hash_func'])) {
- $this->pushError('cannot find hash function with name [' . $params['hash_func'] . ']', CRYPT_RSA_ERROR_WRONG_HASH_FUNC);
- return false;
- }
- $this->_hash_func = $params['hash_func'];
- }
- return true; // all ok
- }
-
- /**
- * Ecnrypts $plain_data by the key $this->_enc_key or $key.
- *
- * @param string $plain_data data, which must be encrypted
- * @param object $key encryption key (object of Crypt_RSA_Key class)
- * @return mixed
- * encrypted data as string on success or false on error
- *
- * @access public
- */
- function encrypt($plain_data, $key = null)
- {
- $enc_data = $this->encryptBinary($plain_data, $key);
- if ($enc_data !== false) {
- return base64_encode($enc_data);
- }
- // error during encripting data
- return false;
- }
-
- /**
- * Ecnrypts $plain_data by the key $this->_enc_key or $key.
- *
- * @param string $plain_data data, which must be encrypted
- * @param object $key encryption key (object of Crypt_RSA_Key class)
- * @return mixed
- * encrypted data as binary string on success or false on error
- *
- * @access public
- */
- function encryptBinary($plain_data, $key = null)
- {
- if (is_null($key)) {
- // use current encryption key
- $key = $this->_enc_key;
- }
- else if (!Crypt_RSA_Key::isValid($key)) {
- $this->pushError('invalid encryption key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
- return false;
- }
-
- // append tail \x01 to plain data. It needs for correctly decrypting of data
- $plain_data .= "\x01";
-
- $plain_data = $this->_math_obj->bin2int($plain_data);
- $exp = $this->_math_obj->bin2int($key->getExponent());
- $modulus = $this->_math_obj->bin2int($key->getModulus());
-
- // divide plain data into chunks
- $data_len = $this->_math_obj->bitLen($plain_data);
- $chunk_len = $key->getKeyLength() - 1;
- $block_len = (int) ceil($chunk_len / 8);
- $curr_pos = 0;
- $enc_data = '';
- while ($curr_pos < $data_len) {
- $tmp = $this->_math_obj->subint($plain_data, $curr_pos, $chunk_len);
- $enc_data .= str_pad(
- $this->_math_obj->int2bin($this->_math_obj->powmod($tmp, $exp, $modulus)),
- $block_len,
- "\0"
- );
- $curr_pos += $chunk_len;
- }
- return $enc_data;
- }
-
- /**
- * Decrypts $enc_data by the key $this->_dec_key or $key.
- *
- * @param string $enc_data encrypted data as string
- * @param object $key decryption key (object of RSA_Crypt_Key class)
- * @return mixed
- * decrypted data as string on success or false on error
- *
- * @access public
- */
- function decrypt($enc_data, $key = null)
- {
- $enc_data = base64_decode($enc_data);
- return $this->decryptBinary($enc_data, $key);
- }
-
- /**
- * Decrypts $enc_data by the key $this->_dec_key or $key.
- *
- * @param string $enc_data encrypted data as binary string
- * @param object $key decryption key (object of RSA_Crypt_Key class)
- * @return mixed
- * decrypted data as string on success or false on error
- *
- * @access public
- */
- function decryptBinary($enc_data, $key = null)
- {
- if (is_null($key)) {
- // use current decryption key
- $key = $this->_dec_key;
- }
- else if (!Crypt_RSA_Key::isValid($key)) {
- $this->pushError('invalid decryption key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
- return false;
- }
-
- $exp = $this->_math_obj->bin2int($key->getExponent());
- $modulus = $this->_math_obj->bin2int($key->getModulus());
-
- $data_len = strlen($enc_data);
- $chunk_len = $key->getKeyLength() - 1;
- $block_len = (int) ceil($chunk_len / 8);
- $curr_pos = 0;
- $bit_pos = 0;
- $plain_data = $this->_math_obj->bin2int("\0");
- while ($curr_pos < $data_len) {
- $tmp = $this->_math_obj->bin2int(substr($enc_data, $curr_pos, $block_len));
- $tmp = $this->_math_obj->powmod($tmp, $exp, $modulus);
- $plain_data = $this->_math_obj->bitOr($plain_data, $tmp, $bit_pos);
- $bit_pos += $chunk_len;
- $curr_pos += $block_len;
- }
- $result = $this->_math_obj->int2bin($plain_data);
-
- // delete tail, containing of \x01
- $tail = ord($result{strlen($result) - 1});
- if ($tail != 1) {
- $this->pushError("Error tail of decrypted text = {$tail}. Expected 1", CRYPT_RSA_ERROR_WRONG_TAIL);
- return false;
- }
- return substr($result, 0, -1);
- }
-
- /**
- * Creates sign for document $document, using $this->_private_key or $private_key
- * as private key and $this->_hash_func or $hash_func as hash function.
- *
- * @param string $document document, which must be signed
- * @param object $private_key private key (object of Crypt_RSA_Key type)
- * @param string $hash_func name of hash function, which will be used during signing
- * @return mixed
- * signature of $document as string on success or false on error
- *
- * @access public
- */
- function createSign($document, $private_key = null, $hash_func = null)
- {
- // check private key
- if (is_null($private_key)) {
- $private_key = $this->_private_key;
- }
- else if (!Crypt_RSA_Key::isValid($private_key)) {
- $this->pushError('invalid private key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
- return false;
- }
- if ($private_key->getKeyType() != 'private') {
- $this->pushError('signing key must be private', CRYPT_RSA_ERROR_NEED_PRV_KEY);
- return false;
- }
-
- // check hash_func
- if (is_null($hash_func)) {
- $hash_func = $this->_hash_func;
- }
- if (!function_exists($hash_func)) {
- $this->pushError("cannot find hash function with name [$hash_func]", CRYPT_RSA_ERROR_WRONG_HASH_FUNC);
- return false;
- }
-
- return $this->encrypt($hash_func($document), $private_key);
- }
-
- /**
- * Validates $signature for document $document with public key $this->_public_key
- * or $public_key and hash function $this->_hash_func or $hash_func.
- *
- * @param string $document document, signature of which must be validated
- * @param string $signature signature, which must be validated
- * @param object $public_key public key (object of Crypt_RSA_Key class)
- * @param string $hash_func hash function, which will be used during validating signature
- * @return mixed
- * true, if signature of document is valid
- * false, if signature of document is invalid
- * null on error
- *
- * @access public
- */
- function validateSign($document, $signature, $public_key = null, $hash_func = null)
- {
- // check public key
- if (is_null($public_key)) {
- $public_key = $this->_public_key;
- }
- else if (!Crypt_RSA_Key::isValid($public_key)) {
- $this->pushError('invalid public key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
- return null;
- }
- if ($public_key->getKeyType() != 'public') {
- $this->pushError('validating key must be public', CRYPT_RSA_ERROR_NEED_PUB_KEY);
- return null;
- }
-
- // check hash_func
- if (is_null($hash_func)) {
- $hash_func = $this->_hash_func;
- }
- if (!function_exists($hash_func)) {
- $this->pushError("cannot find hash function with name [$hash_func]", CRYPT_RSA_ERROR_WRONG_HASH_FUNC);
- return null;
- }
-
- return $hash_func($document) == $this->decrypt($signature, $public_key);
- }
-}
-
-?> \ No newline at end of file
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