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Editing: SymmetricKey.php
<?php declare(strict_types=1); namespace Cose\Key; use InvalidArgumentException; /** * @final */ class SymmetricKey extends Key { final public const DATA_K = -1; /** * @param array<int|string, mixed> $data */ public function __construct(array $data) { parent::__construct($data); if (! isset($data[self::TYPE]) || (int) $data[self::TYPE] !== self::TYPE_OCT) { throw new InvalidArgumentException( 'Invalid symmetric key. The key type does not correspond to a symmetric key' ); } if (! isset($data[self::DATA_K])) { throw new InvalidArgumentException('Invalid symmetric key. The parameter "k" is missing'); } } /** * @param array<int|string, mixed> $data */ public static function create(array $data): self { return new self($data); } public function k(): string { return $this->get(self::DATA_K); } }
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