<?php
declare(strict_types=1);
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2021 Spomky-Labs
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
namespace Cose\Key;
use function array_key_exists;
use Assert\Assertion;
class OkpKey extends Key
{
public const CURVE_X25519 = 4;
public const CURVE_X448 = 5;
public const CURVE_ED25519 = 6;
public const CURVE_ED448 = 7;
public const DATA_CURVE = -1;
public const DATA_X = -2;
public const DATA_D = -4;
private const SUPPORTED_CURVES = [
self::CURVE_X25519,
self::CURVE_X448,
self::CURVE_ED25519,
self::CURVE_ED448,
];
public function __construct(array $data)
{
parent::__construct($data);
Assertion::eq($data[self::TYPE], self::TYPE_OKP, 'Invalid OKP key. The key type does not correspond to an OKP key');
Assertion::keyExists($data, self::DATA_CURVE, 'Invalid EC2 key. The curve is missing');
Assertion::keyExists($data, self::DATA_X, 'Invalid OKP key. The x coordinate is missing');
Assertion::inArray((int) $data[self::DATA_CURVE], self::SUPPORTED_CURVES, 'The curve is not supported');
}
public function x(): string
{
return $this->get(self::DATA_X);
}
public function isPrivate(): bool
{
return array_key_exists(self::DATA_D, $this->getData());
}
public function d(): string
{
Assertion::true($this->isPrivate(), 'The key is not private');
return $this->get(self::DATA_D);
}
public function curve(): int
{
return (int) $this->get(self::DATA_CURVE);
}
}