includes/math.php
author Dan
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Copyright (C) 2006-2009 Dan Fuhry
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 * diffiehellman.php - Diffie Hellman key exchange and supporting functions
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * EnanoMath GMP backend
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 */
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class EnanoMath_GMP
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{
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  var $api = 'GMP';
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  /**
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   * Initializes a number to a GMP integer.
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   * @param string String representation of the number
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   * @param int Base the number is currently in, defaults to 10
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   * @return resource
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   */
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  function init($int, $base = 10)
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  {
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    return ( is_resource($int) ) ? $int : gmp_init($int, $base);
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  }
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  /**
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   * Converts a number from a GMP integer to a string
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   * @param resource
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   * @param int Base, default is 10
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   * @return string
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   */
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  function str($int, $base = 10)
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  {
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    return ( is_string($int) ) ? $int : gmp_strval($int, $base);
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  }
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  /**
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   * Converts a number between bases.
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   * @param resource BigInt to convert
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   * @param int Base to convert from
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   * @param int Base to convert to
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   */
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  function basecon($int, $from, $to)
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  {
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    return $this->init(gmp_strval(gmp_init($this->str($int), $from), $to));
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  }
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  /**
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   * Generates a random integer.
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   * @param int Length
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   * @return resource
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   */
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  function random($len)
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  {
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    return gmp_random($len / 8);
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  }
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  /**
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   * Powmod operation (calculates (a ^ b) mod m)
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   * @param resource a
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   * @param resource b
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   * @param resource m
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   * @return resource
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   */
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  function powmod($a, $b, $m)
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  {
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    $a = $this->init($a);
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    $b = $this->init($b);
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    $m = $this->init($m);
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    return ( function_exists('gmp_powm') ) ? gmp_powm($a, $b, $m) : gmp_mod(gmp_pow($a, $b), $m);
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  }
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}
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/**
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 * EnanoMath big_int backend
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 */
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class EnanoMath_BigInt
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{
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  var $api = 'big_int';
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  /**
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   * Initializes a number to a BigInt integer.
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   * @param string String representation of the number
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   * @param int Base the number is in, defaults to 10
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   * @return resource
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   */
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  function init($int, $base = 10)
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  {
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    return (is_resource($int)) ? $int : bi_from_str($int, $base);
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  }
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  /**
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   * Converts a number from a BigInt integer to a string
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   * @param resource
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   * @param int Base, default is 10
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   * @return string
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   */
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  function str($int, $base = 10)
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  {
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    return ( is_string($int) ) ? $int : bi_to_str($int, $base);
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  }
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  /**
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   * Generates a random integer
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   * @param int Length (bits)
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   * @return resource
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   */
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  function random($len)
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  {
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    return bi_rand($len);
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  }
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  /**
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   * Converts a number between bases.
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   * @param resource BigInt to convert
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   * @param int Base to convert from
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   * @param int Base to convert to
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   */
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  function basecon($int, $from, $to)
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  {
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    return bi_base_convert($this->str($int, $from), $from, $to);
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  }
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  /**
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   * Powmod operation (calculates (a ^ b) mod m)
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   * @param resource a
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   * @param resource b
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   * @param resource m
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   * @return resource
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   */
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  function powmod($a, $b, $m)
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  {
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    $a = $this->init($a);
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    $b = $this->init($b);
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    $m = $this->init($m);
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    return bi_powmod($a, $b, $m);
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  }
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}
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/**
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 * EnanoMath BCMath backend
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 */
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class EnanoMath_BCMath
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{
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  var $api = 'BCMath';
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  /**
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   * Initializes a number to a BCMath integer.
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   * @param string String representation of the number
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   * @param int Base the number is in, defaults to 10
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   * @return resource
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   */
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  function init($int, $base = 10)
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  {
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    return $this->basecon($int, $base, 10);
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  }
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  /**
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   * Converts a number from a BCMath integer to a string
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   * @param resource
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   * @param int Base, default is 10
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   * @return string
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   */
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  function str($res)
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  {
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    return ( is_string($res) ) ? $res : strval($this->basecon($res, 10, $base));
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  }
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  /**
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   * Generates a random integer
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   * @param int Length in bits
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   * @return resource
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   */
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  function random($len)
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  {
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    $len = 4 * $len;
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    $chars = '0123456789abcdef';
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    $ret = '';
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    for ( $i = 0; $i < $len; $i++ )
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    {
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      $chid = mt_rand ( 0, strlen($chars) - 1 );
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      $chr = $chars{$chid};
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      $ret .= $chr;
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    }
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    return $this->basecon($this->init($ret), 16, 10);
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  }
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  /**
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   * Converts a number between bases.
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   * @param resource BigInt to convert
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   * @param int Base to convert from
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   * @param int Base to convert to
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   */
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  function basecon($int, $from, $to)
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  {
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    if ( $from != 10 )
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      $int = $this->_bcmath_base2dec($int, $from);
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    if ( $to != 10 )
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      $int = $this->_bcmath_dec2base($int, $to);
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    return $int;
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  }
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  /**
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   * Powmod operation (calculates (a ^ b) mod m)
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   * @param resource a
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   * @param resource b
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   * @param resource m
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   * @return resource
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   */
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  function powmod($a, $b, $m)
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  {
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    $a = $this->init($a);
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    $b = $this->init($b);
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    $m = $this->init($m);
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    return ( function_exists('bcpowmod') ) ? bcpowmod($a, $b, $m) : bcmod( bcpow($a, $b), $m );
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  }
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  // from us.php.net/bc:
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  // convert a decimal value to any other base value
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  function _bcmath_dec2base($dec,$base,$digits=FALSE) {
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      if($base<2 or $base>256) die("Invalid Base: ".$base);
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      bcscale(0);
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      $value="";
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      if(!$digits) $digits=$this->_bcmath_digits($base);
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      while($dec>$base-1) {
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          $rest=bcmod($dec,$base);
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          $dec=bcdiv($dec,$base);
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          $value=$digits[$rest].$value;
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      }
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      $value=$digits[intval($dec)].$value;
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      return (string) $value;
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  }
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  // convert another base value to its decimal value
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  function _bcmath_base2dec($value,$base,$digits=FALSE) {
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      if($base<2 or $base>256) die("Invalid Base: ".$base);
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      bcscale(0);
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      if($base<37) $value=strtolower($value);
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      if(!$digits) $digits=$this->_bcmath_digits($base);
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      $size=strlen($value);
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      $dec="0";
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      for($loop=0;$loop<$size;$loop++) {
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          $element=strpos($digits,$value[$loop]);
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          $power=bcpow($base,$size-$loop-1);
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          $dec=bcadd($dec,bcmul($element,$power));
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      }
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      return (string) $dec;
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  }
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  function _bcmath_digits($base) {
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      if($base>64) {
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          $digits="";
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          for($loop=0;$loop<256;$loop++) {
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              $digits.=chr($loop);
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          }
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      } else {
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          $digits ="0123456789abcdefghijklmnopqrstuvwxyz";
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          $digits.="ABCDEFGHIJKLMNOPQRSTUVWXYZ-_";
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      }
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      $digits=substr($digits,0,$base);
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      return (string) $digits;
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  }
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}
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/**
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 * Creates a new math object based on what libraries are available.
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 * @return object
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 */
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function enanomath_create()
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{
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  if ( function_exists('gmp_init') )
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    return new EnanoMath_GMP();
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  else if ( function_exists('bi_from_str') )
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    return new EnanoMath_BigInt();
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  else if ( function_exists('bcadd') )
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    return new EnanoMath_BCMath();
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  else
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    throw new Exception('dh_err_not_supported');
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}
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?>