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Filename : KeyChecker.php
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<?php

declare(strict_types=1);

namespace Jose\Component\Core\Util;

use InvalidArgumentException;
use Jose\Component\Core\JWK;
use function in_array;
use function is_array;
use function is_string;
use function sprintf;

/**
 * @internal
 */
final readonly class KeyChecker
{
    public static function checkKeyUsage(JWK $key, string $usage): void
    {
        if ($key->has('use')) {
            self::checkUsage($key, $usage);
        }
        if ($key->has('key_ops')) {
            self::checkOperation($key, $usage);
        }
    }

    public static function checkKeyAlgorithm(JWK $key, string $algorithm): void
    {
        if (! $key->has('alg')) {
            return;
        }
        $alg = $key->get('alg');
        if (! is_string($alg)) {
            throw new InvalidArgumentException('Invalid algorithm.');
        }
        if ($alg !== $algorithm) {
            throw new InvalidArgumentException(sprintf('Key is only allowed for algorithm "%s".', $alg));
        }
    }

    private static function checkOperation(JWK $key, string $usage): void
    {
        $ops = $key->get('key_ops');
        if (! is_array($ops)) {
            throw new InvalidArgumentException('Invalid key parameter "key_ops". Should be a list of key operations');
        }

        switch ($usage) {
            case 'verification':
                if (! in_array('verify', $ops, true)) {
                    throw new InvalidArgumentException('Key cannot be used to verify a signature');
                }

                break;

            case 'signature':
                if (! in_array('sign', $ops, true)) {
                    throw new InvalidArgumentException('Key cannot be used to sign');
                }

                break;

            case 'encryption':
                if (! in_array('encrypt', $ops, true) && ! in_array('wrapKey', $ops, true) && ! in_array(
                    'deriveKey',
                    $ops,
                    true
                )) {
                    throw new InvalidArgumentException('Key cannot be used to encrypt');
                }

                break;

            case 'decryption':
                if (! in_array('decrypt', $ops, true) && ! in_array('unwrapKey', $ops, true) && ! in_array(
                    'deriveBits',
                    $ops,
                    true
                )) {
                    throw new InvalidArgumentException('Key cannot be used to decrypt');
                }

                break;

            default:
                throw new InvalidArgumentException('Unsupported key usage.');
        }
    }

    private static function checkUsage(JWK $key, string $usage): void
    {
        $use = $key->get('use');

        switch ($usage) {
            case 'verification':
            case 'signature':
                if ($use !== 'sig') {
                    throw new InvalidArgumentException('Key cannot be used to sign or verify a signature.');
                }

                break;

            case 'encryption':
            case 'decryption':
                if ($use !== 'enc') {
                    throw new InvalidArgumentException('Key cannot be used to encrypt or decrypt.');
                }

                break;

            default:
                throw new InvalidArgumentException('Unsupported key usage.');
        }
    }
}