<?php declare(strict_types=1);

namespace BradyMcD\TAATP\Hash;
use BradyMcD\TAATP\HashInterface;
use ParagonIE\ConstantTime\Base32;

/** @SuppressWarnings(PHPMD.CamelCaseClassName)*/
class HMAC_SHA1 implements HashInterface
{
    const DEFAULT_SECRET_SIZE = 32;
    /** @SuppressWarnings(PHPMD.StaticAccess) */
    public function hash(string $key, string $val): string
    {
        $key = Base32::decode($key);
        return \hash_hmac("sha1", \hex2bin($val), $key, true);
    }

    public function hashNumeric(string $key, int $val): string
    {
        return $this->hash($key, \dechex($val));
    }

    public static function hashType(): string
    {
        return "SHA1";
    }

    /** @SuppressWarnings(PHPMD.StaticAccess) */
    public static function keygen(): string
    {
        return Base32::encodeUpper(random_bytes(this::DEFAULT_SECRET_SIZE));
    }
}

?>