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<?php
/**
* Prime Finite Fields
*
* PHP version 5 and 7
*
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2017 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
*/
namespace phpseclib3\Math\PrimeField;
use phpseclib3\Common\Functions\Strings;
use phpseclib3\Math\BigInteger;
use phpseclib3\Math\Common\FiniteField\Integer as Base;
/**
* Prime Finite Fields
*
* @author Jim Wigginton <terrafrost@php.net>
*/
class Integer extends Base
{
/**
* Holds the PrimeField's value
*
* @var BigInteger
*/
protected $value;
/**
* Keeps track of current instance
*
* @var int
*/
protected $instanceID;
/**
* Holds the PrimeField's modulo
*
* @var array<int, BigInteger>
*/
protected static $modulo;
/**
* Holds a pre-generated function to perform modulo reductions
*
* @var array<int, callable(BigInteger):BigInteger>
*/
protected static $reduce;
/**
* Zero
*
* @var BigInteger
*/
protected static $zero;
/**
* Default constructor
*
* @param int $instanceID
*/
public function __construct($instanceID, BigInteger $num = null)
{
$this->instanceID = $instanceID;
if (!isset($num)) {
$this->value = clone static::$zero[static::class];
} else {
$reduce = static::$reduce[$instanceID];
$this->value = $reduce($num);
}
}
/**
* Set the modulo for a given instance
*
* @param int $instanceID
* @return void
*/
public static function setModulo($instanceID, BigInteger $modulo)
{
static::$modulo[$instanceID] = $modulo;
}
/**
* Set the modulo for a given instance
*
* @param int $instanceID
* @return void
*/
public static function setRecurringModuloFunction($instanceID, callable $function)
{
static::$reduce[$instanceID] = $function;
if (!isset(static::$zero[static::class])) {
static::$zero[static::class] = new BigInteger();
}
}
/**
* Delete the modulo for a given instance
*/
public static function cleanupCache($instanceID)
{
unset(static::$modulo[$instanceID]);
unset(static::$reduce[$instanceID]);
}
/**
* Returns the modulo
*
* @param int $instanceID
* @return BigInteger
*/
public static function getModulo($instanceID)
{
return static::$modulo[$instanceID];
}
/**
* Tests a parameter to see if it's of the right instance
*
* Throws an exception if the incorrect class is being utilized
*
* @return void
*/
public static function checkInstance(self $x, self $y)
{
if ($x->instanceID != $y->instanceID) {
throw new \UnexpectedValueException('The instances of the two PrimeField\Integer objects do not match');
}
}
/**
* Tests the equality of two numbers.
*
* @return bool
*/
public function equals(self $x)
{
static::checkInstance($this, $x);
return $this->value->equals($x->value);
}
/**
* Compares two numbers.
*
* @return int
*/
public function compare(self $x)
{
static::checkInstance($this, $x);
return $this->value->compare($x->value);
}
/**
* Adds two PrimeFieldIntegers.
*
* @return static
*/
public function add(self $x)
{
static::checkInstance($this, $x);
$temp = new static($this->instanceID);
$temp->value = $this->value->add($x->value);
if ($temp->value->compare(static::$modulo[$this->instanceID]) >= 0) {
$temp->value = $temp->value->subtract(static::$modulo[$this->instanceID]);
}
return $temp;
}
/**
* Subtracts two PrimeFieldIntegers.
*
* @return static
*/
public function subtract(self $x)
{
static::checkInstance($this, $x);
$temp = new static($this->instanceID);
$temp->value = $this->value->subtract($x->value);
if ($temp->value->isNegative()) {
$temp->value = $temp->value->add(static::$modulo[$this->instanceID]);
}
return $temp;
}
/**
* Multiplies two PrimeFieldIntegers.
*
* @return static
*/
public function multiply(self $x)
{
static::checkInstance($this, $x);
return new static($this->instanceID, $this->value->multiply($x->value));
}
/**
* Divides two PrimeFieldIntegers.
*
* @return static
*/
public function divide(self $x)
{
static::checkInstance($this, $x);
$denominator = $x->value->modInverse(static::$modulo[$this->instanceID]);
return new static($this->instanceID, $this->value->multiply($denominator));
}
/**
* Performs power operation on a PrimeFieldInteger.
*
* @return static
*/
public function pow(BigInteger $x)
{
$temp = new static($this->instanceID);
$temp->value = $this->value->powMod($x, static::$modulo[$this->instanceID]);
return $temp;
}
/**
* Calculates the square root
*
* @link https://en.wikipedia.org/wiki/Tonelli%E2%80%93Shanks_algorithm
* @return static|false
*/
public function squareRoot()
{
static $one, $two;
if (!isset($one)) {
$one = new BigInteger(1);
$two = new BigInteger(2);
}
$reduce = static::$reduce[$this->instanceID];
$p_1 = static::$modulo[$this->instanceID]->subtract($one);
$q = clone $p_1;
$s = BigInteger::scan1divide($q);
list($pow) = $p_1->divide($two);
for ($z = $one; !$z->equals(static::$modulo[$this->instanceID]); $z = $z->add($one)) {
$temp = $z->powMod($pow, static::$modulo[$this->instanceID]);
if ($temp->equals($p_1)) {
break;
}
}
$m = new BigInteger($s);
$c = $z->powMod($q, static::$modulo[$this->instanceID]);
$t = $this->value->powMod($q, static::$modulo[$this->instanceID]);
list($temp) = $q->add($one)->divide($two);
$r = $this->value->powMod($temp, static::$modulo[$this->instanceID]);
while (!$t->equals($one)) {
for ($i == clone $one; $i->compare($m) < 0; $i = $i->add($one)) {
if ($t->powMod($two->pow($i), static::$modulo[$this->instanceID])->equals($one)) {
break;
}
}
if ($i->compare($m) == 0) {
return false;
}
$b = $c->powMod($two->pow($m->subtract($i)->subtract($one)), static::$modulo[$this->instanceID]);
$m = $i;
$c = $reduce($b->multiply($b));
$t = $reduce($t->multiply($c));
$r = $reduce($r->multiply($b));
}
return new static($this->instanceID, $r);
}
/**
* Is Odd?
*
* @return bool
*/
public function isOdd()
{
return $this->value->isOdd();
}
/**
* Negate
*
* A negative number can be written as 0-12. With modulos, 0 is the same thing as the modulo
* so 0-12 is the same thing as modulo-12
*
* @return static
*/
public function negate()
{
return new static($this->instanceID, static::$modulo[$this->instanceID]->subtract($this->value));
}
/**
* Converts an Integer to a byte string (eg. base-256).
*
* @return string
*/
public function toBytes()
{
$length = static::$modulo[$this->instanceID]->getLengthInBytes();
return str_pad($this->value->toBytes(), $length, "\0", STR_PAD_LEFT);
}
/**
* Converts an Integer to a hex string (eg. base-16).
*
* @return string
*/
public function toHex()
{
return Strings::bin2hex($this->toBytes());
}
/**
* Converts an Integer to a bit string (eg. base-2).
*
* @return string
*/
public function toBits()
{
// return $this->value->toBits();
static $length;
if (!isset($length)) {
$length = static::$modulo[$this->instanceID]->getLength();
}
return str_pad($this->value->toBits(), $length, '0', STR_PAD_LEFT);
}
/**
* Returns the w-ary non-adjacent form (wNAF)
*
* @param int $w optional
* @return array<int, int>
*/
public function getNAF($w = 1)
{
$w++;
$mask = new BigInteger((1 << $w) - 1);
$sub = new BigInteger(1 << $w);
//$sub = new BigInteger(1 << ($w - 1));
$d = $this->toBigInteger();
$d_i = [];
$i = 0;
while ($d->compare(static::$zero[static::class]) > 0) {
if ($d->isOdd()) {
// start mods
$bigInteger = $d->testBit($w - 1) ?
$d->bitwise_and($mask)->subtract($sub) :
//$sub->subtract($d->bitwise_and($mask)) :
$d->bitwise_and($mask);
// end mods
$d = $d->subtract($bigInteger);
$d_i[$i] = (int) $bigInteger->toString();
} else {
$d_i[$i] = 0;
}
$shift = !$d->equals(static::$zero[static::class]) && $d->bitwise_and($mask)->equals(static::$zero[static::class]) ? $w : 1; // $w or $w + 1?
$d = $d->bitwise_rightShift($shift);
while (--$shift > 0) {
$d_i[++$i] = 0;
}
$i++;
}
return $d_i;
}
/**
* Converts an Integer to a BigInteger
*
* @return BigInteger
*/
public function toBigInteger()
{
return clone $this->value;
}
/**
* __toString() magic method
*
* @return string
*/
public function __toString()
{
return (string) $this->value;
}
/**
* __debugInfo() magic method
*
* @return array
*/
public function __debugInfo()
{
return ['value' => $this->toHex()];
}
}
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