50 lines
1.1 KiB
PHP
50 lines
1.1 KiB
PHP
<?php
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namespace Elliptic\Curve;
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use Elliptic\Curve\MontCurve\Point;
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use Elliptic\Utils;
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use BN\BN;
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class MontCurve extends BaseCurve
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{
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public $a;
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public $b;
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public $i4;
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public $a24;
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function __construct($conf)
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{
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parent::__construct("mont", $conf);
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$this->a = (new BN($conf["a"], 16))->toRed($this->red);
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$this->b = (new BN($conf["b"], 16))->toRed($this->red);
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$this->i4 = (new BN(4))->toRed($this->red)->redInvm();
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$this->a24 = $this->i4->redMul($this->a->redAdd($this->two));
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}
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public function validate($point)
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{
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$x = $point->normalize()->x;
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$x2 = $x->redSqr();
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$rhs = $x2->redMul($x)->redAdd($x2->redMul($this->a))->redAdd($x);
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$y = $rhs->redSqr();
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return $y->redSqr()->cmp($rhs) ===0;
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}
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public function decodePoint($bytes, $enc = false) {
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return $this->point(Utils::toArray($bytes, $enc), 1);
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}
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public function point($x, $z) {
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return new Point($this, $x, $z);
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}
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public function pointFromJSON($obj) {
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return Point::fromJSON($this, $obj);
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}
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}
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?>
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