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   1  <?php
   2  
   3  /**
   4   * secp256k1
   5   *
   6   * This is the curve used in Bitcoin
   7   *
   8   * PHP version 5 and 7
   9   *
  10   * @author    Jim Wigginton <terrafrost@php.net>
  11   * @copyright 2017 Jim Wigginton
  12   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  13   * @link      http://pear.php.net/package/Math_BigInteger
  14   */
  15  
  16  namespace phpseclib3\Crypt\EC\Curves;
  17  
  18  //use phpseclib3\Crypt\EC\BaseCurves\Prime;
  19  use phpseclib3\Crypt\EC\BaseCurves\KoblitzPrime;
  20  use phpseclib3\Math\BigInteger;
  21  
  22  //class secp256k1 extends Prime
  23  class secp256k1 extends KoblitzPrime
  24  {
  25      public function __construct()
  26      {
  27          $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F', 16));
  28          $this->setCoefficients(
  29              new BigInteger('0000000000000000000000000000000000000000000000000000000000000000', 16),
  30              new BigInteger('0000000000000000000000000000000000000000000000000000000000000007', 16)
  31          );
  32          $this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141', 16));
  33          $this->setBasePoint(
  34              new BigInteger('79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798', 16),
  35              new BigInteger('483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8', 16)
  36          );
  37  
  38          $this->basis = [];
  39          $this->basis[] = [
  40              'a' => new BigInteger('3086D221A7D46BCDE86C90E49284EB15', -16),
  41              'b' => new BigInteger('FF1BBC8129FEF177D790AB8056F5401B3D', -16)
  42          ];
  43          $this->basis[] = [
  44              'a' => new BigInteger('114CA50F7A8E2F3F657C1108D9D44CFD8', -16),
  45              'b' => new BigInteger('3086D221A7D46BCDE86C90E49284EB15', -16)
  46          ];
  47          $this->beta = $this->factory->newInteger(new BigInteger('7AE96A2B657C07106E64479EAC3434E99CF0497512F58995C1396C28719501EE', -16));
  48      }
  49  }