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<?php |
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declare(strict_types=1); |
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namespace SKien\PNServer\Utils; |
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/* |
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* extracted required classes and functions from package |
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* spomky-labs/jose |
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* https://github.com/Spomky-Labs/Jose |
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* |
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* @package PNServer |
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* @version 1.0.0 |
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* @copyright MIT License - see the copyright below and LICENSE file for details |
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*/ |
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/* |
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* ********************************************************************* |
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* Copyright (C) 2012 Matyas Danter. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included |
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* in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES |
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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* OTHER DEALINGS IN THE SOFTWARE. |
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* *********************************************************************** |
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*/ |
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class Point |
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{ |
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/** @var \GMP */ |
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private \GMP $x; |
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/** @var \GMP */ |
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private \GMP $y; |
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/** @var \GMP */ |
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private \GMP $order; |
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/** @var bool */ |
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private $infinity = false; |
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/** |
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* Initialize a new instance. |
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* @throws \RuntimeException when either the curve does not contain the given coordinates or |
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* when order is not null and P(x, y) * order is not equal to infinity |
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*/ |
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private function __construct(\GMP $x, \GMP $y, \GMP $order, bool $infinity = false) |
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{ |
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$this->x = $x; |
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$this->y = $y; |
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$this->order = $order; |
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$this->infinity = $infinity; |
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} |
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/** |
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* @return Point |
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*/ |
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public static function create(\GMP $x, \GMP $y, \GMP $order = null) : Point |
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{ |
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return new self($x, $y, null === $order ? \gmp_init(0, 10) : $order); |
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} |
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/** |
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* @return Point |
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*/ |
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public static function infinity() : Point |
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{ |
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$zero = \gmp_init(0, 10); |
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return new self($zero, $zero, $zero, true); |
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} |
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public function isInfinity() : bool |
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{ |
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return $this->infinity; |
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} |
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public function getOrder() : \GMP |
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{ |
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return $this->order; |
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} |
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public function getX() : \GMP |
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{ |
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return $this->x; |
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} |
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public function getY() : \GMP |
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{ |
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return $this->y; |
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} |
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/** |
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* @param Point $a |
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* @param Point $b |
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* @param int $cond |
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*/ |
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public static function cswap(Point $a, Point $b, int $cond) : void |
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{ |
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self::cswapGMP($a->x, $b->x, $cond); |
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self::cswapGMP($a->y, $b->y, $cond); |
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self::cswapGMP($a->order, $b->order, $cond); |
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self::cswapBoolean($a->infinity, $b->infinity, $cond); |
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} |
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private static function cswapBoolean(bool &$a, bool &$b, int $cond) : void |
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{ |
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$sa = \gmp_init((int) ($a), 10); |
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$sb = \gmp_init((int) ($b), 10); |
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self::cswapGMP($sa, $sb, $cond); |
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$a = (bool) \gmp_strval($sa, 10); |
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$b = (bool) \gmp_strval($sb, 10); |
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} |
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private static function cswapGMP(\GMP &$sa, \GMP &$sb, int $cond) : void |
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{ |
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$size = \max(\mb_strlen(\gmp_strval($sa, 2), '8bit'), \mb_strlen(\gmp_strval($sb, 2), '8bit')); |
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$mask = (string) (1 - (int) ($cond)); |
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$mask = \str_pad('', $size, $mask, STR_PAD_LEFT); |
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$mask = \gmp_init($mask, 2); |
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$taA = Math::bitwiseAnd($sa, $mask); |
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$taB = Math::bitwiseAnd($sb, $mask); |
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$sa = Math::bitwiseXor(Math::bitwiseXor($sa, $sb), $taB); |
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$sb = Math::bitwiseXor(Math::bitwiseXor($sa, $sb), $taA); |
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$sa = Math::bitwiseXor(Math::bitwiseXor($sa, $sb), $taB); |
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} |
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} |
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Stefanius67 /
PNServer
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