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<?php
declare(strict_types=1);
namespace Lcobucci\JWT\Signer;
use Lcobucci\JWT\Signer;
use function hash_equals;
use function sodium_crypto_generichash;
use function strlen;
final class Blake2b implements Signer
{
private const MINIMUM_KEY_LENGTH_IN_BITS = 256;
public function algorithmId(): string
{
return 'BLAKE2B';
}
public function sign(string $payload, Key $key): string
{
$actualKeyLength = 8 * strlen($key->contents());
if ($actualKeyLength < self::MINIMUM_KEY_LENGTH_IN_BITS) {
throw InvalidKeyProvided::tooShort(self::MINIMUM_KEY_LENGTH_IN_BITS, $actualKeyLength);
}
return sodium_crypto_generichash($payload, $key->contents());
}
public function verify(string $expected, string $payload, Key $key): bool
{
return hash_equals($expected, $this->sign($payload, $key));
}
}