src/Signer/Hmac.php
final public function sign(string $payload, Key $key): string
    {
        return hash_hmac($this->getAlgorithm(), $payload, $key->getContent(), true);
    }
final public function sign(string $payload, Key $key): string
    {
        return hash_hmac($this->getAlgorithm(), $payload, $key->getContent(), true);
    }
{@inheritdoc}