HMACSigner.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\FileDelivery\Token\Signer;
 
use ILIAS\FileDelivery\Token\Signer\Algorithm\Algorithm;
use ILIAS\FileDelivery\Token\Signer\Key\Signing\SigningKey;
 
class HMACSigner implements Signer
{
    public function __construct(
        private Algorithm $algorithm
    ) {
    }
 
    protected function getAlgorithm(): string
    {
        return $this->algorithm->getName();
    }
 
    public function sign(
        string $signable_payload,
        SigningKey $signing_key
    ): string {
        // sign the payload using hmac_hash
        return $this->algorithm->after(hash_hmac(
            $this->getAlgorithm(),
            $signable_payload,
            $signing_key->get(),
            false
        ));
    }
 
    public function verify(
        string $data,
        string $signature,
        int $validity,
        SigningKey $signing_key
    ): bool {
        $signature_check = $this->sign($data, $signing_key);
        if ($signature_check !== $signature) {
            return false;
        }
        return !($validity > 0 && $validity < time());
    }
}