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827 daniel-mar 1 
<?php
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/**
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 * secp256k1
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 *
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 * This is the curve used in Bitcoin
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 *
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 * PHP version 5 and 7
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 *
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 * @category  Crypt
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 * @package   EC
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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @copyright 2017 Jim Wigginton
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 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
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 * @link      http://pear.php.net/package/Math_BigInteger
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 */
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namespace phpseclib3\Crypt\EC\Curves;
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//use phpseclib3\Crypt\EC\BaseCurves\Prime;
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use phpseclib3\Crypt\EC\BaseCurves\KoblitzPrime;
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use phpseclib3\Math\BigInteger;
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//class secp256k1 extends Prime
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class secp256k1 extends KoblitzPrime
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{
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    public function __construct()
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    {
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        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F', 16));
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        $this->setCoefficients(
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            new BigInteger('0000000000000000000000000000000000000000000000000000000000000000', 16),
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            new BigInteger('0000000000000000000000000000000000000000000000000000000000000007', 16)
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        );
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        $this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141', 16));
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        $this->setBasePoint(
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            new BigInteger('79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798', 16),
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            new BigInteger('483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8', 16)
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        );
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        $this->basis = [];
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        $this->basis[] = [
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            'a' => new BigInteger('3086D221A7D46BCDE86C90E49284EB15', -16),
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            'b' => new BigInteger('FF1BBC8129FEF177D790AB8056F5401B3D', -16)
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        ];
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        $this->basis[] = [
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            'a' => new BigInteger('114CA50F7A8E2F3F657C1108D9D44CFD8', -16),
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            'b' => new BigInteger('3086D221A7D46BCDE86C90E49284EB15', -16)
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        ];
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        $this->beta = $this->factory->newInteger(new BigInteger('7AE96A2B657C07106E64479EAC3434E99CF0497512F58995C1396C28719501EE', -16));
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    }
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}