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   1  <?php
   2  
   3  /**
   4   * Montgomery Public Key Handler
   5   *
   6   * PHP version 5
   7   *
   8   * @category  Crypt
   9   * @package   EC
  10   * @author    Jim Wigginton <[email protected]>
  11   * @copyright 2015 Jim Wigginton
  12   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  13   * @link      http://phpseclib.sourceforge.net
  14   */
  15  
  16  namespace phpseclib3\Crypt\EC\Formats\Keys;
  17  
  18  use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
  19  use phpseclib3\Crypt\EC\Curves\Curve25519;
  20  use phpseclib3\Crypt\EC\Curves\Curve448;
  21  use phpseclib3\Math\BigInteger;
  22  
  23  /**
  24   * Montgomery Public Key Handler
  25   *
  26   * @package EC
  27   * @author  Jim Wigginton <[email protected]>
  28   * @access  public
  29   */
  30  abstract class MontgomeryPublic
  31  {
  32      /**
  33       * Is invisible flag
  34       *
  35       * @access private
  36       */
  37      const IS_INVISIBLE = true;
  38  
  39      /**
  40       * Break a public or private key down into its constituent components
  41       *
  42       * @access public
  43       * @param string $key
  44       * @param string $password optional
  45       * @return array
  46       */
  47      public static function load($key, $password = '')
  48      {
  49          switch (strlen($key)) {
  50              case 32:
  51                  $curve = new Curve25519();
  52                  break;
  53              case 56:
  54                  $curve = new Curve448();
  55                  break;
  56              default:
  57                  throw new \LengthException('The only supported lengths are 32 and 56');
  58          }
  59  
  60          $components = ['curve' => $curve];
  61          $components['QA'] = [$components['curve']->convertInteger(new BigInteger(strrev($key), 256))];
  62  
  63          return $components;
  64      }
  65  
  66      /**
  67       * Convert an EC public key to the appropriate format
  68       *
  69       * @access public
  70       * @param \phpseclib3\Crypt\EC\BaseCurves\Montgomery $curve
  71       * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
  72       * @return string
  73       */
  74      public static function savePublicKey(MontgomeryCurve $curve, array $publicKey)
  75      {
  76          return strrev($publicKey[0]->toBytes());
  77      }
  78  }