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<?php /** * OpenSSL Modular Exponentiation Engine * * PHP version 5 and 7 * * @author Jim Wigginton <[email protected]> * @copyright 2017 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://pear.php.net/package/Math_BigInteger */ namespace phpseclib3\Math\BigInteger\Engines; use phpseclib3\Crypt\RSA\Formats\Keys\PKCS8; use phpseclib3\Math\BigInteger; /** * OpenSSL Modular Exponentiation Engine * * @author Jim Wigginton <[email protected]> */ abstract class OpenSSL { /** * Test for engine validity * * @return bool */ public static function isValidEngine() { return extension_loaded('openssl') && static::class != __CLASS__; } /** * Performs modular exponentiation. * * @param Engine $x * @param Engine $e * @param Engine $n * @return Engine */ public static function powModHelper(Engine $x, Engine $e, Engine $n) { if ($n->getLengthInBytes() < 31 || $n->getLengthInBytes() > 16384) { throw new \OutOfRangeException('Only modulo between 31 and 16384 bits are accepted'); } $key = PKCS8::savePublicKey( new BigInteger($n), new BigInteger($e) ); $plaintext = str_pad($x->toBytes(), $n->getLengthInBytes(), "\0", STR_PAD_LEFT); // this is easily prone to failure. if the modulo is a multiple of 2 or 3 or whatever it // won't work and you'll get a "failure: error:0906D06C:PEM routines:PEM_read_bio:no start line" // error. i suppose, for even numbers, we could do what PHP\Montgomery.php does, but then what // about odd numbers divisible by 3, by 5, etc? if (!openssl_public_encrypt($plaintext, $result, $key, OPENSSL_NO_PADDING)) { throw new \UnexpectedValueException(openssl_error_string()); } $class = get_class($x); return new $class($result, 256); } }