--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/includes/math.php Sat Mar 01 18:56:37 2008 -0500
@@ -0,0 +1,308 @@
+<?php
+
+/*
+ * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
+ * Version 1.1.2 (Caoineag alpha 2)
+ * Copyright (C) 2006-2007 Dan Fuhry
+ * diffiehellman.php - Diffie Hellman key exchange and supporting functions
+ *
+ * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
+ */
+
+/**
+ * EnanoMath GMP backend
+ */
+
+class EnanoMath_GMP
+{
+ var $api = 'GMP';
+
+ /**
+ * Initializes a number to a GMP integer.
+ * @param string String representation of the number
+ * @param int Base the number is currently in, defaults to 10
+ * @return resource
+ */
+
+ function init($int, $base = 10)
+ {
+ return ( is_resource($int) ) ? $int : gmp_init($int, $base);
+ }
+
+ /**
+ * Converts a number from a GMP integer to a string
+ * @param resource
+ * @param int Base, default is 10
+ * @return string
+ */
+
+ function str($int, $base = 10)
+ {
+ return ( is_string($int) ) ? $int : gmp_strval($int, $base);
+ }
+
+ /**
+ * Converts a number between bases.
+ * @param resource BigInt to convert
+ * @param int Base to convert from
+ * @param int Base to convert to
+ */
+
+ function basecon($int, $from, $to)
+ {
+ return $this->init(gmp_strval(gmp_init($this->str($int), $from), $to));
+ }
+
+ /**
+ * Generates a random integer.
+ * @param int Length
+ * @return resource
+ */
+
+ function random($len)
+ {
+ return gmp_random($len);
+ }
+
+ /**
+ * Powmod operation (calculates (a ^ b) mod m)
+ * @param resource a
+ * @param resource b
+ * @param resource m
+ * @return resource
+ */
+
+ function powmod($a, $b, $m)
+ {
+ $a = $this->init($a);
+ $b = $this->init($b);
+ $m = $this->init($m);
+ return ( function_exists('gmp_powm') ) ? gmp_powm($a, $b, $m) : gmp_mod(gmp_pow($a, $b), $m);
+ }
+}
+
+/**
+ * EnanoMath big_int backend
+ */
+
+class EnanoMath_BigInt
+{
+ var $api = 'big_int';
+
+ /**
+ * Initializes a number to a BigInt integer.
+ * @param string String representation of the number
+ * @param int Base the number is in, defaults to 10
+ * @return resource
+ */
+
+ function init($int, $base = 10)
+ {
+ return (is_resource($int)) ? $int : bi_from_str($int, $base);
+ }
+
+ /**
+ * Converts a number from a BigInt integer to a string
+ * @param resource
+ * @param int Base, default is 10
+ * @return string
+ */
+
+ function str($int, $base = 10)
+ {
+ return ( is_string($int) ) ? $int : bi_to_str($int, $base);
+ }
+
+ /**
+ * Generates a random integer
+ * @param int Length (bits)
+ * @return resource
+ */
+
+ function random($len)
+ {
+ return bi_rand($len);
+ }
+
+ /**
+ * Converts a number between bases.
+ * @param resource BigInt to convert
+ * @param int Base to convert from
+ * @param int Base to convert to
+ */
+
+ function basecon($int, $from, $to)
+ {
+ return bi_base_convert($this->str($int, $from), $from, $to);
+ }
+
+ /**
+ * Powmod operation (calculates (a ^ b) mod m)
+ * @param resource a
+ * @param resource b
+ * @param resource m
+ * @return resource
+ */
+
+ function powmod($a, $b, $m)
+ {
+ $a = $this->init($a);
+ $b = $this->init($b);
+ $m = $this->init($m);
+ return bi_powmod($a, $b, $m);
+ }
+}
+
+/**
+ * EnanoMath BCMath backend
+ */
+
+class EnanoMath_BCMath
+{
+ var $api = 'BCMath';
+
+ /**
+ * Initializes a number to a BCMath integer.
+ * @param string String representation of the number
+ * @param int Base the number is in, defaults to 10
+ * @return resource
+ */
+
+ function init($int, $base = 10)
+ {
+ return $this->basecon($int, $base, 10);
+ }
+
+ /**
+ * Converts a number from a BCMath integer to a string
+ * @param resource
+ * @param int Base, default is 10
+ * @return string
+ */
+
+ function str($res)
+ {
+ return ( is_string($res) ) ? $res : strval($this->basecon($res, 10, $base));
+ }
+
+ /**
+ * Generates a random integer
+ * @param int Length in bits
+ * @return resource
+ */
+
+ function random($len)
+ {
+ $len = 4 * $len;
+ $chars = '0123456789abcdef';
+ $ret = '';
+ for ( $i = 0; $i < $len; $i++ )
+ {
+ $chid = mt_rand ( 0, strlen($chars) - 1 );
+ $chr = $chars{$chid};
+ $ret .= $chr;
+ }
+ return $this->basecon($this->init($ret), 16, 10);
+ }
+
+ /**
+ * Converts a number between bases.
+ * @param resource BigInt to convert
+ * @param int Base to convert from
+ * @param int Base to convert to
+ */
+
+ function basecon($int, $from, $to)
+ {
+ if ( $from != 10 )
+ $int = $this->_bcmath_base2dec($int, $from);
+ if ( $to != 10 )
+ $int = $this->_bcmath_dec2base($int, $to);
+ return $int;
+ }
+
+ /**
+ * Powmod operation (calculates (a ^ b) mod m)
+ * @param resource a
+ * @param resource b
+ * @param resource m
+ * @return resource
+ */
+
+ function powmod($a, $b, $m)
+ {
+ $a = $this->init($a);
+ $b = $this->init($b);
+ $m = $this->init($m);
+ return ( function_exists('bcpowmod') ) ? bcpowmod($a, $b, $m) : bcmod( bcpow($a, $b), $m );
+ }
+
+ // from us.php.net/bc:
+ // convert a decimal value to any other base value
+ function _bcmath_dec2base($dec,$base,$digits=FALSE) {
+ if($base<2 or $base>256) die("Invalid Base: ".$base);
+ bcscale(0);
+ $value="";
+ if(!$digits) $digits=$this->_bcmath_digits($base);
+ while($dec>$base-1) {
+ $rest=bcmod($dec,$base);
+ $dec=bcdiv($dec,$base);
+ $value=$digits[$rest].$value;
+ }
+ $value=$digits[intval($dec)].$value;
+ return (string) $value;
+ }
+
+ // convert another base value to its decimal value
+ function _bcmath_base2dec($value,$base,$digits=FALSE) {
+ if($base<2 or $base>256) die("Invalid Base: ".$base);
+ bcscale(0);
+ if($base<37) $value=strtolower($value);
+ if(!$digits) $digits=$this->_bcmath_digits($base);
+ $size=strlen($value);
+ $dec="0";
+ for($loop=0;$loop<$size;$loop++) {
+ $element=strpos($digits,$value[$loop]);
+ $power=bcpow($base,$size-$loop-1);
+ $dec=bcadd($dec,bcmul($element,$power));
+ }
+ return (string) $dec;
+ }
+
+ function _bcmath_digits($base) {
+ if($base>64) {
+ $digits="";
+ for($loop=0;$loop<256;$loop++) {
+ $digits.=chr($loop);
+ }
+ } else {
+ $digits ="0123456789abcdefghijklmnopqrstuvwxyz";
+ $digits.="ABCDEFGHIJKLMNOPQRSTUVWXYZ-_";
+ }
+ $digits=substr($digits,0,$base);
+ return (string) $digits;
+ }
+}
+
+/**
+ * Creates a new math object based on what libraries are available.
+ * @return object
+ */
+
+function enanomath_create()
+{
+ if ( function_exists('gmp_init') )
+ return new EnanoMath_GMP();
+ else if ( function_exists('bi_from_str') )
+ return new EnanoMath_BigInt();
+ else if ( function_exists('bcadd') )
+ return new EnanoMath_BCMath();
+ else
+ throw new Exception('dh_err_not_supported');
+}
+
+?>