<?php

/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Uuid\Generator;

use Ramsey\Uuid\Converter\NumberConverterInterface;
use Ramsey\Uuid\Exception\DceSecurityException;
use Ramsey\Uuid\Provider\DceSecurityProviderInterface;
use Ramsey\Uuid\Type\Hexadecimal;
use Ramsey\Uuid\Type\Integer as IntegerObject;
use Ramsey\Uuid\Uuid;

use function hex2bin;
use function in_array;
use function pack;
use function str_pad;
use function strlen;
use function substr_replace;

use const STR_PAD_LEFT;

/**
 * DceSecurityGenerator generates strings of binary data based on a local
 * domain, local identifier, node ID, clock sequence, and the current time
 */
class DceSecurityGenerator implements DceSecurityGeneratorInterface
{
    private const DOMAINS = [
        Uuid::DCE_DOMAIN_PERSON,
        Uuid::DCE_DOMAIN_GROUP,
        Uuid::DCE_DOMAIN_ORG,
    ];

    /**
     * Upper bounds for the clock sequence in DCE Security UUIDs.
     */
    private const CLOCK_SEQ_HIGH = 63;

    /**
     * Lower bounds for the clock sequence in DCE Security UUIDs.
     */
    private const CLOCK_SEQ_LOW = 0;

    public function __construct(
        private NumberConverterInterface $numberConverter,
        private TimeGeneratorInterface $timeGenerator,
        private DceSecurityProviderInterface $dceSecurityProvider
    ) {
    }

    public function generate(
        int $localDomain,
        ?IntegerObject $localIdentifier = null,
        ?Hexadecimal $node = null,
        ?int $clockSeq = null
    ): string {
        if (!in_array($localDomain, self::DOMAINS)) {
            throw new DceSecurityException(
                'Local domain must be a valid DCE Security domain'
            );
        }

        if ($localIdentifier && $localIdentifier->isNegative()) {
            throw new DceSecurityException(
                'Local identifier out of bounds; it must be a value between 0 and 4294967295'
            );
        }

        if ($clockSeq > self::CLOCK_SEQ_HIGH || $clockSeq < self::CLOCK_SEQ_LOW) {
            throw new DceSecurityException(
                'Clock sequence out of bounds; it must be a value between 0 and 63'
            );
        }

        switch ($localDomain) {
            case Uuid::DCE_DOMAIN_ORG:
                if ($localIdentifier === null) {
                    throw new DceSecurityException(
                        'A local identifier must be provided for the org domain'
                    );
                }

                break;
            case Uuid::DCE_DOMAIN_PERSON:
                if ($localIdentifier === null) {
                    $localIdentifier = $this->dceSecurityProvider->getUid();
                }

                break;
            case Uuid::DCE_DOMAIN_GROUP:
            default:
                if ($localIdentifier === null) {
                    $localIdentifier = $this->dceSecurityProvider->getGid();
                }

                break;
        }

        $identifierHex = $this->numberConverter->toHex($localIdentifier->toString());

        // The maximum value for the local identifier is 0xffffffff, or
        // 4294967295. This is 8 hexadecimal digits, so if the length of
        // hexadecimal digits is greater than 8, we know the value is greater
        // than 0xffffffff.
        if (strlen($identifierHex) > 8) {
            throw new DceSecurityException(
                'Local identifier out of bounds; it must be a value between 0 and 4294967295'
            );
        }

        $domainByte = pack('n', $localDomain)[1];
        $identifierBytes = (string) hex2bin(str_pad($identifierHex, 8, '0', STR_PAD_LEFT));

        if ($node instanceof Hexadecimal) {
            $node = $node->toString();
        }

        // Shift the clock sequence 8 bits to the left, so it matches 0x3f00.
        if ($clockSeq !== null) {
            $clockSeq = $clockSeq << 8;
        }

        $bytes = $this->timeGenerator->generate($node, $clockSeq);

        // Replace bytes in the time-based UUID with DCE Security values.
        $bytes = substr_replace($bytes, $identifierBytes, 0, 4);

        return substr_replace($bytes, $domainByte, 9, 1);
    }
}

• [F] CombGenerator.php
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• [F] DceSecurityGenerator.php
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• [F] DceSecurityGeneratorInterface.php
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• [F] DefaultNameGenerator.php
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• [F] DefaultTimeGenerator.php
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• [F] NameGeneratorFactory.php
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• [F] NameGeneratorInterface.php
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• [F] PeclUuidNameGenerator.php
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• [F] PeclUuidRandomGenerator.php
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• [F] PeclUuidTimeGenerator.php
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• [F] RandomBytesGenerator.php
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• [F] RandomGeneratorFactory.php
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• [F] RandomGeneratorInterface.php
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• [F] RandomLibAdapter.php
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• [F] TimeGeneratorFactory.php
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• [F] TimeGeneratorInterface.php
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• [F] UnixTimeGenerator.php
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About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

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FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

How do I register for NFC Pay?

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Is my payment information secure?

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Can I add multiple cards to my NFC Pay wallet?

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