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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
+ */
+
+/**
+ * Crypt_RSA_Math_GMP class.
+ *
+ * Provides set of math functions, which are used by Crypt_RSA package
+ * This class is a wrapper for PHP GMP extension.
+ * See http://php.net/gmp for details.
+ *
+ * @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_Math_GMP
+{
+ /**
+ * error description
+ *
+ * @var string
+ * @access public
+ */
+ var $errstr = '';
+
+ /**
+ * Crypt_RSA_Math_GMP constructor.
+ * Checks an existance of PHP GMP package.
+ * See http://php.net/gmp for details.
+ *
+ * On failure saves error description in $this->errstr
+ *
+ * @access public
+ */
+ function Crypt_RSA_Math_GMP()
+ {
+ if (!extension_loaded('gmp')) {
+ if (!@dl('gmp.' . PHP_SHLIB_SUFFIX) && !@dl('php_gmp.' . PHP_SHLIB_SUFFIX)) {
+ // cannot load GMP extension
+ $this->errstr = 'Crypt_RSA package requires PHP GMP package. ' .
+ 'See http://php.net/gmp for details';
+ return;
+ }
+ }
+ }
+
+ /**
+ * Transforms binary representation of large integer into its native form.
+ *
+ * Example of transformation:
+ * $str = "\x12\x34\x56\x78\x90";
+ * $num = 0x9078563412;
+ *
+ * @param string $str
+ * @return gmp resource
+ * @access public
+ */
+ function bin2int($str)
+ {
+ $result = 0;
+ $n = strlen($str);
+ do {
+ // dirty hack: GMP returns FALSE, when second argument equals to int(0).
+ // so, it must be converted to string '0'
+ $result = gmp_add(gmp_mul($result, 256), strval(ord($str{--$n})));
+ } while ($n > 0);
+ return $result;
+ }
+
+ /**
+ * Transforms large integer into binary representation.
+ *
+ * Example of transformation:
+ * $num = 0x9078563412;
+ * $str = "\x12\x34\x56\x78\x90";
+ *
+ * @param gmp resource $num
+ * @return string
+ * @access public
+ */
+ function int2bin($num)
+ {
+ $result = '';
+ do {
+ $result .= chr(gmp_intval(gmp_mod($num, 256)));
+ $num = gmp_div($num, 256);
+ } while (gmp_cmp($num, 0));
+ return $result;
+ }
+
+ /**
+ * Calculates pow($num, $pow) (mod $mod)
+ *
+ * @param gmp resource $num
+ * @param gmp resource $pow
+ * @param gmp resource $mod
+ * @return gmp resource
+ * @access public
+ */
+ function powmod($num, $pow, $mod)
+ {
+ return gmp_powm($num, $pow, $mod);
+ }
+
+ /**
+ * Calculates $num1 * $num2
+ *
+ * @param gmp resource $num1
+ * @param gmp resource $num2
+ * @return gmp resource
+ * @access public
+ */
+ function mul($num1, $num2)
+ {
+ return gmp_mul($num1, $num2);
+ }
+
+ /**
+ * Calculates $num1 % $num2
+ *
+ * @param string $num1
+ * @param string $num2
+ * @return string
+ * @access public
+ */
+ function mod($num1, $num2)
+ {
+ return gmp_mod($num1, $num2);
+ }
+
+ /**
+ * Compares abs($num1) to abs($num2).
+ * Returns:
+ * -1, if abs($num1) < abs($num2)
+ * 0, if abs($num1) == abs($num2)
+ * 1, if abs($num1) > abs($num2)
+ *
+ * @param gmp resource $num1
+ * @param gmp resource $num2
+ * @return int
+ * @access public
+ */
+ function cmpAbs($num1, $num2)
+ {
+ return gmp_cmp($num1, $num2);
+ }
+
+ /**
+ * Tests $num on primality. Returns true, if $num is strong pseudoprime.
+ * Else returns false.
+ *
+ * @param string $num
+ * @return bool
+ * @access private
+ */
+ function isPrime($num)
+ {
+ return gmp_prob_prime($num) ? true : false;
+ }
+
+ /**
+ * Generates prime number with length $bits_cnt
+ * using $random_generator as random generator function.
+ *
+ * @param int $bits_cnt
+ * @param string $rnd_generator
+ * @access public
+ */
+ function getPrime($bits_cnt, $random_generator)
+ {
+ $bytes_n = intval($bits_cnt / 8);
+ $bits_n = $bits_cnt % 8;
+ do {
+ $str = '';
+ for ($i = 0; $i < $bytes_n; $i++) {
+ $str .= chr(call_user_func($random_generator) & 0xff);
+ }
+ $n = call_user_func($random_generator) & 0xff;
+ $n |= 0x80;
+ $n >>= 8 - $bits_n;
+ $str .= chr($n);
+ $num = $this->bin2int($str);
+
+ // search for the next closest prime number after [$num]
+ if (!gmp_cmp(gmp_mod($num, '2'), '0')) {
+ $num = gmp_add($num, '1');
+ }
+ while (!gmp_prob_prime($num)) {
+ $num = gmp_add($num, '2');
+ }
+ } while ($this->bitLen($num) != $bits_cnt);
+ return $num;
+ }
+
+ /**
+ * Calculates $num - 1
+ *
+ * @param gmp resource $num
+ * @return gmp resource
+ * @access public
+ */
+ function dec($num)
+ {
+ return gmp_sub($num, 1);
+ }
+
+ /**
+ * Returns true, if $num is equal to one. Else returns false
+ *
+ * @param gmp resource $num
+ * @return bool
+ * @access public
+ */
+ function isOne($num)
+ {
+ return !gmp_cmp($num, 1);
+ }
+
+ /**
+ * Finds greatest common divider (GCD) of $num1 and $num2
+ *
+ * @param gmp resource $num1
+ * @param gmp resource $num2
+ * @return gmp resource
+ * @access public
+ */
+ function GCD($num1, $num2)
+ {
+ return gmp_gcd($num1, $num2);
+ }
+
+ /**
+ * Finds inverse number $inv for $num by modulus $mod, such as:
+ * $inv * $num = 1 (mod $mod)
+ *
+ * @param gmp resource $num
+ * @param gmp resource $mod
+ * @return gmp resource
+ * @access public
+ */
+ function invmod($num, $mod)
+ {
+ return gmp_invert($num, $mod);
+ }
+
+ /**
+ * Returns bit length of number $num
+ *
+ * @param gmp resource $num
+ * @return int
+ * @access public
+ */
+ function bitLen($num)
+ {
+ $tmp = $this->int2bin($num);
+ $bit_len = strlen($tmp) * 8;
+ $tmp = ord($tmp{strlen($tmp) - 1});
+ if (!$tmp) {
+ $bit_len -= 8;
+ }
+ else {
+ while (!($tmp & 0x80)) {
+ $bit_len--;
+ $tmp <<= 1;
+ }
+ }
+ return $bit_len;
+ }
+
+ /**
+ * Calculates bitwise or of $num1 and $num2,
+ * starting from bit $start_pos for number $num1
+ *
+ * @param gmp resource $num1
+ * @param gmp resource $num2
+ * @param int $start_pos
+ * @return gmp resource
+ * @access public
+ */
+ function bitOr($num1, $num2, $start_pos)
+ {
+ $start_byte = intval($start_pos / 8);
+ $start_bit = $start_pos % 8;
+ $tmp1 = $this->int2bin($num1);
+
+ $num2 = gmp_mul($num2, 1 << $start_bit);
+ $tmp2 = $this->int2bin($num2);
+ if ($start_byte < strlen($tmp1)) {
+ $tmp2 |= substr($tmp1, $start_byte);
+ $tmp1 = substr($tmp1, 0, $start_byte) . $tmp2;
+ }
+ else {
+ $tmp1 = str_pad($tmp1, $start_byte, "\0") . $tmp2;
+ }
+ return $this->bin2int($tmp1);
+ }
+
+ /**
+ * Returns part of number $num, starting at bit
+ * position $start with length $length
+ *
+ * @param gmp resource $num
+ * @param int start
+ * @param int length
+ * @return gmp resource
+ * @access public
+ */
+ function subint($num, $start, $length)
+ {
+ $start_byte = intval($start / 8);
+ $start_bit = $start % 8;
+ $byte_length = intval($length / 8);
+ $bit_length = $length % 8;
+ if ($bit_length) {
+ $byte_length++;
+ }
+ $num = gmp_div($num, 1 << $start_bit);
+ $tmp = substr($this->int2bin($num), $start_byte, $byte_length);
+ $tmp = str_pad($tmp, $byte_length, "\0");
+ $tmp = substr_replace($tmp, $tmp{$byte_length - 1} & chr(0xff >> (8 - $bit_length)), $byte_length - 1, 1);
+ return $this->bin2int($tmp);
+ }
+
+ /**
+ * Returns name of current wrapper
+ *
+ * @return string name of current wrapper
+ * @access public
+ */
+ function getWrapperName()
+ {
+ return 'GMP';
+ }
+}
+
+?> \ No newline at end of file
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