<?php

/**
 * Raw Signature Handler
 *
 * PHP version 8.1+
 *
 * Handles signatures as arrays
 *
 * @author    Jim Wigginton <terrafrost@php.net>
 * @copyright 2016-2026 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      https://phpseclib.com/
 */

declare(strict_types=1);

namespace phpseclib4\Crypt\Common\Formats\Signature;

use phpseclib4\Math\BigInteger;

/**
 * Raw Signature Handler
 *
 * @author  Jim Wigginton <terrafrost@php.net>
 */
abstract class Raw
{
    /**
     * Loads a signature
     *
     * @psalm-suppress PossiblyUnusedMethod
     */
    public static function load(array $sig): array
    {
        switch (true) {
            case !isset($sig['r']) || !isset($sig['s']):
            case !$sig['r'] instanceof BigInteger:
            case !$sig['s'] instanceof BigInteger:
                return [];
        }

        return [
            'r' => $sig['r'],
            's' => $sig['s'],
        ];
    }

    /**
     * Returns a signature in the appropriate format
     *
     * @psalm-suppress PossiblyUnusedMethod
     */
    public static function save(BigInteger $r, BigInteger $s): array
    {
        return compact('r', 's');
    }
}