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Editing: OkpKey.php

<?php

declare(strict_types=1);

namespace Cose\Key;

use InvalidArgumentException;
use function array_key_exists;
use function in_array;

/**
 * @final
 * @see \Cose\Tests\Key\OkpKeyTest
 */
class OkpKey extends Key
{
    final public const CURVE_X25519 = 4;

final public const CURVE_X448 = 5;

final public const CURVE_ED25519 = 6;

final public const CURVE_ED448 = 7;

final public const CURVE_NAME_X25519 = 'X25519';

final public const CURVE_NAME_X448 = 'X448';

final public const CURVE_NAME_ED25519 = 'Ed25519';

final public const CURVE_NAME_ED448 = 'Ed448';

final public const DATA_CURVE = -1;

final public const DATA_X = -2;

final public const DATA_D = -4;

private const SUPPORTED_CURVES_INT = [
        self::CURVE_X25519,
        self::CURVE_X448,
        self::CURVE_ED25519,
        self::CURVE_ED448,
    ];

private const SUPPORTED_CURVES_NAME = [
        self::CURVE_NAME_X25519,
        self::CURVE_NAME_X448,
        self::CURVE_NAME_ED25519,
        self::CURVE_NAME_ED448,
    ];

/**
     * @param array<int|string, mixed> $data
     */
    public function __construct(array $data)
    {
        foreach ([self::DATA_CURVE, self::TYPE] as $key) {
            if (is_numeric($data[$key])) {
                $data[$key] = (int) $data[$key];
            }
        }
        parent::__construct($data);
        if ($data[self::TYPE] !== self::TYPE_OKP && $data[self::TYPE] !== self::TYPE_NAME_OKP) {
            throw new InvalidArgumentException('Invalid OKP key. The key type does not correspond to an OKP key');
        }
        if (! isset($data[self::DATA_CURVE], $data[self::DATA_X])) {
            throw new InvalidArgumentException('Invalid EC2 key. The curve or the "x" coordinate is missing');
        }
        if (is_numeric($data[self::DATA_CURVE])) {
            if (! in_array((int) $data[self::DATA_CURVE], self::SUPPORTED_CURVES_INT, true)) {
                throw new InvalidArgumentException('The curve is not supported');
            }
        } elseif (! in_array($data[self::DATA_CURVE], self::SUPPORTED_CURVES_NAME, true)) {
            throw new InvalidArgumentException('The curve is not supported');
        }
    }

/**
     * @param array<int|string, mixed> $data
     */
    public static function create(array $data): self
    {
        return new self($data);
    }

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
    {
        if (! $this->isPrivate()) {
            throw new InvalidArgumentException('The key is not private.');
        }

return $this->get(self::DATA_D);
    }

public function curve(): int|string
    {
        return $this->get(self::DATA_CURVE);
    }
}

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