Key.php

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<?php

namespace Firebase\JWT;

use InvalidArgumentException;
use OpenSSLAsymmetricKey;
use OpenSSLCertificate;
use TypeError;

class Key
{
    private $keyMaterial;
    private string $algorithm;

    public function __construct(
        $keyMaterial,
        string $algorithm
    ) {
        if (
            !\is_string($keyMaterial)
            && !$keyMaterial instanceof OpenSSLAsymmetricKey
            && !$keyMaterial instanceof OpenSSLCertificate
            && !\is_resource($keyMaterial)
        ) {
            throw new TypeError('Key material must be a string, resource, or OpenSSLAsymmetricKey');
        }

        if (empty($keyMaterial)) {
            throw new InvalidArgumentException('Key material must not be empty');
        }

        if (empty($algorithm)) {
            throw new InvalidArgumentException('Algorithm must not be empty');
        }

        // TODO: Remove in PHP 8.0 in favor of class constructor property promotion
        $this->keyMaterial = $keyMaterial;
        $this->algorithm = $algorithm;
    }

    public function getAlgorithm(): string
    {
        return $this->algorithm;
    }

    public function getKeyMaterial()
    {
        return $this->keyMaterial;
    }
}