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   1  <?php
   2  
   3  declare(strict_types=1);
   4  
   5  /*
   6   * The MIT License (MIT)
   7   *
   8   * Copyright (c) 2014-2019 Spomky-Labs
   9   *
  10   * This software may be modified and distributed under the terms
  11   * of the MIT license.  See the LICENSE file for details.
  12   */
  13  
  14  namespace Cose\Key;
  15  
  16  use Assert\Assertion;
  17  
  18  class OkpKey extends Key
  19  {
  20      public const CURVE_X25519 = 4;
  21      public const CURVE_X448 = 5;
  22      public const CURVE_ED25519 = 6;
  23      public const CURVE_ED448 = 7;
  24  
  25      private const SUPPORTED_CURVES = [
  26          self::CURVE_X25519,
  27          self::CURVE_X448,
  28          self::CURVE_ED25519,
  29          self::CURVE_ED448,
  30      ];
  31  
  32      public const DATA_CURVE = -1;
  33      public const DATA_X = -2;
  34      public const DATA_D = -4;
  35  
  36      public function __construct(array $data)
  37      {
  38          parent::__construct($data);
  39          Assertion::eq($data[self::TYPE], self::TYPE_OKP, 'Invalid OKP key. The key type does not correspond to an OKP key');
  40          Assertion::keyExists($data, self::DATA_CURVE, 'Invalid EC2 key. The curve is missing');
  41          Assertion::keyExists($data, self::DATA_X, 'Invalid OKP key. The x coordinate is missing');
  42          Assertion::inArray((int) $data[self::DATA_CURVE], self::SUPPORTED_CURVES, 'The curve is not supported');
  43      }
  44  
  45      public function x(): string
  46      {
  47          return $this->get(self::DATA_X);
  48      }
  49  
  50      public function isPrivate(): bool
  51      {
  52          return \array_key_exists(self::DATA_D, $this->getData());
  53      }
  54  
  55      public function d(): string
  56      {
  57          Assertion::true($this->isPrivate(), 'The key is not private');
  58  
  59          return $this->get(self::DATA_D);
  60      }
  61  
  62      public function curve(): int
  63      {
  64          return (int) $this->get(self::DATA_CURVE);
  65      }
  66  }