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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: KeyPair.php,v 1.7 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';
+
+/**
+ * helper class for single key managing
+ */
+require_once 'Crypt/RSA/Key.php';
+
+/**
+ * Crypt_RSA_KeyPair class, derived from Crypt_RSA_ErrorHandler
+ *
+ * Provides the following functions:
+ * - generate($key) - generates new key pair
+ * - getPublicKey() - returns public key
+ * - getPrivateKey() - returns private key
+ * - getKeyLength() - returns bit key length
+ * - setRandomGenerator($func_name) - sets random generator to $func_name
+ * - fromPEMString($str) - retrieves keypair from PEM-encoded string
+ * - toPEMString() - stores keypair to PEM-encoded string
+ * - isEqual($keypair2) - compares current keypair to $keypair2
+ *
+ * Example usage:
+ * // create new 1024-bit key pair
+ * $key_pair = new Crypt_RSA_KeyPair(1024);
+ *
+ * // error check
+ * if ($key_pair->isError()) {
+ * echo "error while initializing Crypt_RSA_KeyPair object:\n";
+ * $erorr = $key_pair->getLastError();
+ * echo $error->getMessage(), "\n";
+ * }
+ *
+ * // get public key
+ * $public_key = $key_pair->getPublicKey();
+ *
+ * // get private key
+ * $private_key = $key_pair->getPrivateKey();
+ *
+ * // generate new 512-bit key pair
+ * $key_pair->generate(512);
+ *
+ * // error check
+ * if ($key_pair->isError()) {
+ * echo "error while generating key pair:\n";
+ * $erorr = $key_pair->getLastError();
+ * echo $error->getMessage(), "\n";
+ * }
+ *
+ * // get key pair length
+ * $length = $key_pair->getKeyLength();
+ *
+ * // set random generator to $func_name, where $func_name
+ * // consists name of random generator function. See comments
+ * // before setRandomGenerator() method for details
+ * $key_pair->setRandomGenerator($func_name);
+ *
+ * // error check
+ * if ($key_pair->isError()) {
+ * echo "error while changing random generator:\n";
+ * $erorr = $key_pair->getLastError();
+ * echo $error->getMessage(), "\n";
+ * }
+ *
+ * // using factory() method instead of constructor (it returns PEAR_Error object on failure)
+ * $rsa_obj = &Crypt_RSA_KeyPair::factory($key_len);
+ * if (PEAR::isError($rsa_obj)) {
+ * echo "error: ", $rsa_obj->getMessage(), "\n";
+ * }
+ *
+ * // read key pair from PEM-encoded string:
+ * $str = "-----BEGIN RSA PRIVATE KEY-----"
+ * . "MCsCAQACBHr5LDkCAwEAAQIEBc6jbQIDAOCfAgMAjCcCAk3pAgJMawIDAL41"
+ * . "-----END RSA PRIVATE KEY-----";
+ * $keypair = Crypt_RSA_KeyPair::fromPEMString($str);
+ *
+ * // read key pair from .pem file 'private.pem':
+ * $str = file_get_contents('private.pem');
+ * $keypair = Crypt_RSA_KeyPair::fromPEMString($str);
+ *
+ * // generate and write 1024-bit key pair to .pem file 'private_new.pem'
+ * $keypair = new Crypt_RSA_KeyPair(1024);
+ * $str = $keypair->toPEMString();
+ * file_put_contents('private_new.pem', $str);
+ *
+ * // compare $keypair1 to $keypair2
+ * if ($keypair1->isEqual($keypair2)) {
+ * echo "keypair1 = keypair2\n";
+ * }
+ * else {
+ * echo "keypair1 != keypair2\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_KeyPair 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;
+
+ /**
+ * length of each key in the key pair
+ *
+ * @var int
+ * @access private
+ */
+ var $_key_len;
+
+ /**
+ * public key
+ *
+ * @var object of Crypt_RSA_KEY class
+ * @access private
+ */
+ var $_public_key;
+
+ /**
+ * private key
+ *
+ * @var object of Crypt_RSA_KEY class
+ * @access private
+ */
+ var $_private_key;
+
+ /**
+ * name of function, which is used as random generator
+ *
+ * @var string
+ * @access private
+ */
+ var $_random_generator;
+
+ /**
+ * RSA keypair attributes [version, n, e, d, p, q, dmp1, dmq1, iqmp] as associative array
+ *
+ * @var array
+ * @access private
+ */
+ var $_attrs;
+
+ /**
+ * Returns names of keypair attributes from $this->_attrs array
+ *
+ * @return array Array of keypair attributes names
+ * @access private
+ */
+ function _get_attr_names()
+ {
+ return array('version', 'n', 'e', 'd', 'p', 'q', 'dmp1', 'dmq1', 'iqmp');
+ }
+
+ /**
+ * Parses ASN.1 string [$str] starting form position [$pos].
+ * Returns tag and string value of parsed object.
+ *
+ * @param string $str
+ * @param int &$pos
+ * @param Crypt_RSA_ErrorHandler &$err_handler
+ *
+ * @return mixed Array('tag' => ..., 'str' => ...) on success, false on error
+ * @access private
+ */
+ function _ASN1Parse($str, &$pos, &$err_handler)
+ {
+ $max_pos = strlen($str);
+ if ($max_pos < 2) {
+ $err_handler->pushError("ASN.1 string too short");
+ return false;
+ }
+
+ // get ASN.1 tag value
+ $tag = ord($str[$pos++]) & 0x1f;
+ if ($tag == 0x1f) {
+ $tag = 0;
+ do {
+ $n = ord($str[$pos++]);
+ $tag <<= 7;
+ $tag |= $n & 0x7f;
+ } while (($n & 0x80) && $pos < $max_pos);
+ }
+ if ($pos >= $max_pos) {
+ $err_handler->pushError("ASN.1 string too short");
+ return false;
+ }
+
+ // get ASN.1 object length
+ $len = ord($str[$pos++]);
+ if ($len & 0x80) {
+ $n = $len & 0x1f;
+ $len = 0;
+ while ($n-- && $pos < $max_pos) {
+ $len <<= 8;
+ $len |= ord($str[$pos++]);
+ }
+ }
+ if ($pos >= $max_pos || $len > $max_pos - $pos) {
+ $err_handler->pushError("ASN.1 string too short");
+ return false;
+ }
+
+ // get string value of ASN.1 object
+ $str = substr($str, $pos, $len);
+
+ return array(
+ 'tag' => $tag,
+ 'str' => $str,
+ );
+ }
+
+ /**
+ * Parses ASN.1 sting [$str] starting from position [$pos].
+ * Returns string representation of number, which can be passed
+ * in bin2int() function of math wrapper.
+ *
+ * @param string $str
+ * @param int &$pos
+ * @param Crypt_RSA_ErrorHandler &$err_handler
+ *
+ * @return mixed string representation of parsed number on success, false on error
+ * @access private
+ */
+ function _ASN1ParseInt($str, &$pos, &$err_handler)
+ {
+ $tmp = Crypt_RSA_KeyPair::_ASN1Parse($str, $pos, $err_handler);
+ if ($err_handler->isError()) {
+ return false;
+ }
+ if ($tmp['tag'] != 0x02) {
+ $errstr = sprintf("wrong ASN tag value: 0x%02x. Expected 0x02 (INTEGER)", $tmp['tag']);
+ $err_handler->pushError($errstr);
+ return false;
+ }
+ $pos += strlen($tmp['str']);
+
+ return strrev($tmp['str']);
+ }
+
+ /**
+ * Constructs ASN.1 string from tag $tag and object $str
+ *
+ * @param string $str ASN.1 object string
+ * @param int $tag ASN.1 tag value
+ * @param bool $is_constructed
+ * @param bool $is_private
+ *
+ * @return ASN.1-encoded string
+ * @access private
+ */
+ function _ASN1Store($str, $tag, $is_constructed = false, $is_private = false)
+ {
+ $out = '';
+
+ // encode ASN.1 tag value
+ $tag_ext = ($is_constructed ? 0x20 : 0) | ($is_private ? 0xc0 : 0);
+ if ($tag < 0x1f) {
+ $out .= chr($tag | $tag_ext);
+ } else {
+ $out .= chr($tag_ext | 0x1f);
+ $tmp = chr($tag & 0x7f);
+ $tag >>= 7;
+ while ($tag) {
+ $tmp .= chr(($tag & 0x7f) | 0x80);
+ $tag >>= 7;
+ }
+ $out .= strrev($tmp);
+ }
+
+ // encode ASN.1 object length
+ $len = strlen($str);
+ if ($len < 0x7f) {
+ $out .= chr($len);
+ } else {
+ $tmp = '';
+ $n = 0;
+ while ($len) {
+ $tmp .= chr($len & 0xff);
+ $len >>= 8;
+ $n++;
+ }
+ $out .= chr($n | 0x80);
+ $out .= strrev($tmp);
+ }
+
+ return $out . $str;
+ }
+
+ /**
+ * Constructs ASN.1 string from binary representation of big integer
+ *
+ * @param string $str binary representation of big integer
+ *
+ * @return ASN.1-encoded string
+ * @access private
+ */
+ function _ASN1StoreInt($str)
+ {
+ $str = strrev($str);
+ return Crypt_RSA_KeyPair::_ASN1Store($str, 0x02);
+ }
+
+ /**
+ * Crypt_RSA_KeyPair constructor.
+ *
+ * Wrapper: 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 int $key_len bit length of key pair, which will be generated in constructor
+ * @param string $wrapper_name wrapper name
+ * @param string $error_handler name of error handler function
+ * @param callback $random_generator function which will be used as random generator
+ *
+ * @access public
+ */
+ function Crypt_RSA_KeyPair($key_len, $wrapper_name = 'default', $error_handler = '', $random_generator = null)
+ {
+ // 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
+ $this->pushError($obj);
+ return;
+ }
+ $this->_math_obj = &$obj;
+
+ // set random generator
+ if (!$this->setRandomGenerator($random_generator)) {
+ // error in setRandomGenerator() function
+ return;
+ }
+
+ if (is_array($key_len)) {
+ // ugly BC hack - it is possible to pass RSA private key attributes [version, n, e, d, p, q, dmp1, dmq1, iqmp]
+ // as associative array instead of key length to Crypt_RSA_KeyPair constructor
+ $rsa_attrs = $key_len;
+
+ // convert attributes to big integers
+ $attr_names = $this->_get_attr_names();
+ foreach ($attr_names as $attr) {
+ if (!isset($rsa_attrs[$attr])) {
+ $this->pushError("missing required RSA attribute [$attr]");
+ return;
+ }
+ ${$attr} = $this->_math_obj->bin2int($rsa_attrs[$attr]);
+ }
+
+ // check primality of p and q
+ if (!$this->_math_obj->isPrime($p)) {
+ $this->pushError("[p] must be prime");
+ return;
+ }
+ if (!$this->_math_obj->isPrime($q)) {
+ $this->pushError("[q] must be prime");
+ return;
+ }
+
+ // check n = p * q
+ $n1 = $this->_math_obj->mul($p, $q);
+ if ($this->_math_obj->cmpAbs($n, $n1)) {
+ $this->pushError("n != p * q");
+ return;
+ }
+
+ // check e * d = 1 mod (p-1) * (q-1)
+ $p1 = $this->_math_obj->dec($p);
+ $q1 = $this->_math_obj->dec($q);
+ $p1q1 = $this->_math_obj->mul($p1, $q1);
+ $ed = $this->_math_obj->mul($e, $d);
+ $one = $this->_math_obj->mod($ed, $p1q1);
+ if (!$this->_math_obj->isOne($one)) {
+ $this->pushError("e * d != 1 mod (p-1)*(q-1)");
+ return;
+ }
+
+ // check dmp1 = d mod (p-1)
+ $dmp = $this->_math_obj->mod($d, $p1);
+ if ($this->_math_obj->cmpAbs($dmp, $dmp1)) {
+ $this->pushError("dmp1 != d mod (p-1)");
+ return;
+ }
+
+ // check dmq1 = d mod (q-1)
+ $dmq = $this->_math_obj->mod($d, $q1);
+ if ($this->_math_obj->cmpAbs($dmq, $dmq1)) {
+ $this->pushError("dmq1 != d mod (q-1)");
+ return;
+ }
+
+ // check iqmp = 1/q mod p
+ $q1 = $this->_math_obj->invmod($iqmp, $p);
+ if ($this->_math_obj->cmpAbs($q, $q1)) {
+ $this->pushError("iqmp != 1/q mod p");
+ return;
+ }
+
+ // try to create public key object
+ $public_key = &new Crypt_RSA_Key($rsa_attrs['n'], $rsa_attrs['e'], 'public', $wrapper_name, $error_handler);
+ if ($public_key->isError()) {
+ // error during creating public object
+ $this->pushError($public_key->getLastError());
+ return;
+ }
+
+ // try to create private key object
+ $private_key = &new Crypt_RSA_Key($rsa_attrs['n'], $rsa_attrs['d'], 'private', $wrapper_name, $error_handler);
+ if ($private_key->isError()) {
+ // error during creating private key object
+ $this->pushError($private_key->getLastError());
+ return;
+ }
+
+ $this->_public_key = $public_key;
+ $this->_private_key = $private_key;
+ $this->_key_len = $public_key->getKeyLength();
+ $this->_attrs = $rsa_attrs;
+ } else {
+ // generate key pair
+ if (!$this->generate($key_len)) {
+ // error during generating key pair
+ return;
+ }
+ }
+ }
+
+ /**
+ * Crypt_RSA_KeyPair factory.
+ *
+ * Wrapper - 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 int $key_len bit length of key pair, which will be generated in constructor
+ * @param string $wrapper_name wrapper name
+ * @param string $error_handler name of error handler function
+ * @param callback $random_generator function which will be used as random generator
+ *
+ * @return object new Crypt_RSA_KeyPair object on success or PEAR_Error object on failure
+ * @access public
+ */
+ function &factory($key_len, $wrapper_name = 'default', $error_handler = '', $random_generator = null)
+ {
+ $obj = &new Crypt_RSA_KeyPair($key_len, $wrapper_name, $error_handler, $random_generator);
+ if ($obj->isError()) {
+ // error during creating a new object. Return PEAR_Error object
+ return $obj->getLastError();
+ }
+ // object created successfully. Return it
+ return $obj;
+ }
+
+ /**
+ * Generates new Crypt_RSA key pair with length $key_len.
+ * If $key_len is missed, use an old key length from $this->_key_len
+ *
+ * @param int $key_len bit length of key pair, which will be generated
+ *
+ * @return bool true on success or false on error
+ * @access public
+ */
+ function generate($key_len = null)
+ {
+ if (is_null($key_len)) {
+ // use an old key length
+ $key_len = $this->_key_len;
+ if (is_null($key_len)) {
+ $this->pushError('missing key_len parameter', CRYPT_RSA_ERROR_MISSING_KEY_LEN);
+ return false;
+ }
+ }
+
+ // minimal key length is 8 bit ;)
+ if ($key_len < 8) {
+ $key_len = 8;
+ }
+ // store key length in the _key_len property
+ $this->_key_len = $key_len;
+
+ // set [e] to 0x10001 (65537)
+ $e = $this->_math_obj->bin2int("\x01\x00\x01");
+
+ // generate [p], [q] and [n]
+ $p_len = intval(($key_len + 1) / 2);
+ $q_len = $key_len - $p_len;
+ $p1 = $q1 = 0;
+ do {
+ // generate prime number [$p] with length [$p_len] with the following condition:
+ // GCD($e, $p - 1) = 1
+ do {
+ $p = $this->_math_obj->getPrime($p_len, $this->_random_generator);
+ $p1 = $this->_math_obj->dec($p);
+ $tmp = $this->_math_obj->GCD($e, $p1);
+ } while (!$this->_math_obj->isOne($tmp));
+ // generate prime number [$q] with length [$q_len] with the following conditions:
+ // GCD($e, $q - 1) = 1
+ // $q != $p
+ do {
+ $q = $this->_math_obj->getPrime($q_len, $this->_random_generator);
+ $q1 = $this->_math_obj->dec($q);
+ $tmp = $this->_math_obj->GCD($e, $q1);
+ } while (!$this->_math_obj->isOne($tmp) && !$this->_math_obj->cmpAbs($q, $p));
+ // if (p < q), then exchange them
+ if ($this->_math_obj->cmpAbs($p, $q) < 0) {
+ $tmp = $p;
+ $p = $q;
+ $q = $tmp;
+ $tmp = $p1;
+ $p1 = $q1;
+ $q1 = $tmp;
+ }
+ // calculate n = p * q
+ $n = $this->_math_obj->mul($p, $q);
+ } while ($this->_math_obj->bitLen($n) != $key_len);
+
+ // calculate d = 1/e mod (p - 1) * (q - 1)
+ $pq = $this->_math_obj->mul($p1, $q1);
+ $d = $this->_math_obj->invmod($e, $pq);
+
+ // calculate dmp1 = d mod (p - 1)
+ $dmp1 = $this->_math_obj->mod($d, $p1);
+
+ // calculate dmq1 = d mod (q - 1)
+ $dmq1 = $this->_math_obj->mod($d, $q1);
+
+ // calculate iqmp = 1/q mod p
+ $iqmp = $this->_math_obj->invmod($q, $p);
+
+ // store RSA keypair attributes
+ $this->_attrs = array(
+ 'version' => "\x00",
+ 'n' => $this->_math_obj->int2bin($n),
+ 'e' => $this->_math_obj->int2bin($e),
+ 'd' => $this->_math_obj->int2bin($d),
+ 'p' => $this->_math_obj->int2bin($p),
+ 'q' => $this->_math_obj->int2bin($q),
+ 'dmp1' => $this->_math_obj->int2bin($dmp1),
+ 'dmq1' => $this->_math_obj->int2bin($dmq1),
+ 'iqmp' => $this->_math_obj->int2bin($iqmp),
+ );
+
+ $n = $this->_attrs['n'];
+ $e = $this->_attrs['e'];
+ $d = $this->_attrs['d'];
+
+ // try to create public key object
+ $obj = &new Crypt_RSA_Key($n, $e, 'public', $this->_math_obj->getWrapperName(), $this->_error_handler);
+ if ($obj->isError()) {
+ // error during creating public object
+ $this->pushError($obj->getLastError());
+ return false;
+ }
+ $this->_public_key = &$obj;
+
+ // try to create private key object
+ $obj = &new Crypt_RSA_Key($n, $d, 'private', $this->_math_obj->getWrapperName(), $this->_error_handler);
+ if ($obj->isError()) {
+ // error during creating private key object
+ $this->pushError($obj->getLastError());
+ return false;
+ }
+ $this->_private_key = &$obj;
+
+ return true; // key pair successfully generated
+ }
+
+ /**
+ * Returns public key from the pair
+ *
+ * @return object public key object of class Crypt_RSA_Key
+ * @access public
+ */
+ function getPublicKey()
+ {
+ return $this->_public_key;
+ }
+
+ /**
+ * Returns private key from the pair
+ *
+ * @return object private key object of class Crypt_RSA_Key
+ * @access public
+ */
+ function getPrivateKey()
+ {
+ return $this->_private_key;
+ }
+
+ /**
+ * Sets name of random generator function for key generation.
+ * If parameter is skipped, then sets to default random generator.
+ *
+ * Random generator function must return integer with at least 8 lower
+ * significant bits, which will be used as random values.
+ *
+ * @param string $random_generator name of random generator function
+ *
+ * @return bool true on success or false on error
+ * @access public
+ */
+ function setRandomGenerator($random_generator = null)
+ {
+ static $default_random_generator = null;
+
+ if (is_string($random_generator)) {
+ // set user's random generator
+ if (!function_exists($random_generator)) {
+ $this->pushError("can't find random generator function with name [{$random_generator}]");
+ return false;
+ }
+ $this->_random_generator = $random_generator;
+ } else {
+ // set default random generator
+ $this->_random_generator = is_null($default_random_generator) ?
+ ($default_random_generator = create_function('', '$a=explode(" ",microtime());return(int)($a[0]*1000000);')) :
+ $default_random_generator;
+ }
+ return true;
+ }
+
+ /**
+ * Returns length of each key in the key pair
+ *
+ * @return int bit length of each key in key pair
+ * @access public
+ */
+ function getKeyLength()
+ {
+ return $this->_key_len;
+ }
+
+ /**
+ * Retrieves RSA keypair from PEM-encoded string, containing RSA private key.
+ * Example of such string:
+ * -----BEGIN RSA PRIVATE KEY-----
+ * MCsCAQACBHtvbSECAwEAAQIEeYrk3QIDAOF3AgMAjCcCAmdnAgJMawIDALEk
+ * -----END RSA PRIVATE KEY-----
+ *
+ * Wrapper: 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 $str PEM-encoded string
+ * @param string $wrapper_name Wrapper name
+ * @param string $error_handler name of error handler function
+ *
+ * @return Crypt_RSA_KeyPair object on success, PEAR_Error object on error
+ * @access public
+ * @static
+ */
+ function &fromPEMString($str, $wrapper_name = 'default', $error_handler = '')
+ {
+ if (isset($this)) {
+ if ($wrapper_name == 'default') {
+ $wrapper_name = $this->_math_obj->getWrapperName();
+ }
+ if ($error_handler == '') {
+ $error_handler = $this->_error_handler;
+ }
+ }
+ $err_handler = &new Crypt_RSA_ErrorHandler;
+ $err_handler->setErrorHandler($error_handler);
+
+ // search for base64-encoded private key
+ if (!preg_match('/-----BEGIN RSA PRIVATE KEY-----([^-]+)-----END RSA PRIVATE KEY-----/', $str, $matches)) {
+ $err_handler->pushError("can't find RSA private key in the string [{$str}]");
+ return $err_handler->getLastError();
+ }
+
+ // parse private key. It is ASN.1-encoded
+ $str = base64_decode($matches[1]);
+ $pos = 0;
+ $tmp = Crypt_RSA_KeyPair::_ASN1Parse($str, $pos, $err_handler);
+ if ($err_handler->isError()) {
+ return $err_handler->getLastError();
+ }
+ if ($tmp['tag'] != 0x10) {
+ $errstr = sprintf("wrong ASN tag value: 0x%02x. Expected 0x10 (SEQUENCE)", $tmp['tag']);
+ $err_handler->pushError($errstr);
+ return $err_handler->getLastError();
+ }
+
+ // parse ASN.1 SEQUENCE for RSA private key
+ $attr_names = Crypt_RSA_KeyPair::_get_attr_names();
+ $n = sizeof($attr_names);
+ $rsa_attrs = array();
+ for ($i = 0; $i < $n; $i++) {
+ $tmp = Crypt_RSA_KeyPair::_ASN1ParseInt($str, $pos, $err_handler);
+ if ($err_handler->isError()) {
+ return $err_handler->getLastError();
+ }
+ $attr = $attr_names[$i];
+ $rsa_attrs[$attr] = $tmp;
+ }
+
+ // create Crypt_RSA_KeyPair object.
+ $keypair = &new Crypt_RSA_KeyPair($rsa_attrs, $wrapper_name, $error_handler);
+ if ($keypair->isError()) {
+ return $keypair->getLastError();
+ }
+
+ return $keypair;
+ }
+
+ /**
+ * converts keypair to PEM-encoded string, which can be stroed in
+ * .pem compatible files, contianing RSA private key.
+ *
+ * @return string PEM-encoded keypair on success, false on error
+ * @access public
+ */
+ function toPEMString()
+ {
+ // store RSA private key attributes into ASN.1 string
+ $str = '';
+ $attr_names = $this->_get_attr_names();
+ $n = sizeof($attr_names);
+ $rsa_attrs = $this->_attrs;
+ for ($i = 0; $i < $n; $i++) {
+ $attr = $attr_names[$i];
+ if (!isset($rsa_attrs[$attr])) {
+ $this->pushError("Cannot find value for ASN.1 attribute [$attr]");
+ return false;
+ }
+ $tmp = $rsa_attrs[$attr];
+ $str .= Crypt_RSA_KeyPair::_ASN1StoreInt($tmp);
+ }
+
+ // prepend $str by ASN.1 SEQUENCE (0x10) header
+ $str = Crypt_RSA_KeyPair::_ASN1Store($str, 0x10, true);
+
+ // encode and format PEM string
+ $str = base64_encode($str);
+ $str = chunk_split($str, 64, "\n");
+ return "-----BEGIN RSA PRIVATE KEY-----\n$str-----END RSA PRIVATE KEY-----\n";
+ }
+
+ /**
+ * Compares keypairs in Crypt_RSA_KeyPair objects $this and $key_pair
+ *
+ * @param Crypt_RSA_KeyPair $key_pair keypair to compare
+ *
+ * @return bool true, if keypair stored in $this equal to keypair stored in $key_pair
+ * @access public
+ */
+ function isEqual($key_pair)
+ {
+ $attr_names = $this->_get_attr_names();
+ foreach ($attr_names as $attr) {
+ if ($this->_attrs[$attr] != $key_pair->_attrs[$attr]) {
+ return false;
+ }
+ }
+ return true;
+ }
+}
+
+?>
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-31 18:28:08 +0000