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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   * @category  Crypt
  11   * @package   EC
  12   * @author    Jim Wigginton <[email protected]>
  13   * @copyright 2017 Jim Wigginton
  14   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  15   * @link      http://pear.php.net/package/Math_BigInteger
  16   */
  17  
  18  namespace phpseclib3\Crypt\EC\Curves;
  19  
  20  //use phpseclib3\Crypt\EC\BaseCurves\Prime;
  21  use phpseclib3\Crypt\EC\BaseCurves\KoblitzPrime;
  22  use phpseclib3\Math\BigInteger;
  23  
  24  //class secp256k1 extends Prime
  25  class secp256k1 extends KoblitzPrime
  26  {
  27      public function __construct()
  28      {
  29          $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F', 16));
  30          $this->setCoefficients(
  31              new BigInteger('0000000000000000000000000000000000000000000000000000000000000000', 16),
  32              new BigInteger('0000000000000000000000000000000000000000000000000000000000000007', 16)
  33          );
  34          $this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141', 16));
  35          $this->setBasePoint(
  36              new BigInteger('79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798', 16),
  37              new BigInteger('483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8', 16)
  38          );
  39  
  40          $this->basis = [];
  41          $this->basis[] = [
  42              'a' => new BigInteger('3086D221A7D46BCDE86C90E49284EB15', -16),
  43              'b' => new BigInteger('FF1BBC8129FEF177D790AB8056F5401B3D', -16)
  44          ];
  45          $this->basis[] = [
  46              'a' => new BigInteger('114CA50F7A8E2F3F657C1108D9D44CFD8', -16),
  47              'b' => new BigInteger('3086D221A7D46BCDE86C90E49284EB15', -16)
  48          ];
  49          $this->beta = $this->factory->newInteger(new BigInteger('7AE96A2B657C07106E64479EAC3434E99CF0497512F58995C1396C28719501EE', -16));
  50      }
  51  }