128 lines
4.0 KiB
PHP
128 lines
4.0 KiB
PHP
<?php
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/**
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* File: uuid.inc
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* Author: Andrew Moore (http://php.net/manual/en/function.uniqid.php#94959)
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* Integrated by: Matt Shuter
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* Purpose: Generates VALID RFC 4211 COMPLIANT Universally Unique IDentifiers (UUID) version 3, 4 and 5.
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* Version 3 and 5 UUIDs are named based. They require a namespace (another valid UUID) and a value (the name).
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* Given the same namespace and name, the output is always the same.
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* Version 4 UUIDs are pseudo-random.
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* UUIDs generated below validates using OSSP UUID Tool, and output for named-based UUIDs are exactly the same.
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* Created: Feb 20, 2017
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*
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* Copyright 2017: Cyber Perspective, LLC, All rights reserved
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* Released under the Apache v2.0 License
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*
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* See license.txt for details
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*
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* Change Log:
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* - Oct 16, 2017 - File created
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*/
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/* Usage
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*
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* Named-based UUID.
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* $v3uuid = UUID::v3('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString');
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* $v5uuid = UUID::v5('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString');
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*
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* Pseudo-random UUID
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* $v4uuid = UUID::v4();
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*/
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class UUID {
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public static function v3($namespace, $name) {
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if (!self::is_valid($namespace))
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return false;
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// Get hexadecimal components of namespace
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$nhex = str_replace(array('-', '{', '}'), '', $namespace);
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// Binary Value
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$nstr = '';
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// Convert Namespace UUID to bits
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for ($i = 0; $i < strlen($nhex); $i += 2) {
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$nstr .= chr(hexdec($nhex[$i] . $nhex[$i + 1]));
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}
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// Calculate hash value
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$hash = md5($nstr . $name);
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return sprintf('%08s-%04s-%04x-%04x-%12s',
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// 32 bits for "time_low"
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substr($hash, 0, 8),
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// 16 bits for "time_mid"
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substr($hash, 8, 4),
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// 16 bits for "time_hi_and_version",
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// four most significant bits holds version number 3
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(hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x3000,
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// 16 bits, 8 bits for "clk_seq_hi_res",
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// 8 bits for "clk_seq_low",
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// two most significant bits holds zero and one for variant DCE1.1
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(hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
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// 48 bits for "node"
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substr($hash, 20, 12)
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);
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}
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public static function v4() {
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return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
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// 32 bits for "time_low"
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mt_rand(0, 0xffff), mt_rand(0, 0xffff),
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// 16 bits for "time_mid"
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mt_rand(0, 0xffff),
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// 16 bits for "time_hi_and_version",
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// four most significant bits holds version number 4
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mt_rand(0, 0x0fff) | 0x4000,
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// 16 bits, 8 bits for "clk_seq_hi_res",
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// 8 bits for "clk_seq_low",
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// two most significant bits holds zero and one for variant DCE1.1
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mt_rand(0, 0x3fff) | 0x8000,
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// 48 bits for "node"
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mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
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);
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}
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public static function v5($namespace, $name) {
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if (!self::is_valid($namespace))
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return false;
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// Get hexadecimal components of namespace
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$nhex = str_replace(array('-', '{', '}'), '', $namespace);
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// Binary Value
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$nstr = '';
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// Convert Namespace UUID to bits
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for ($i = 0; $i < strlen($nhex); $i += 2) {
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$nstr .= chr(hexdec($nhex[$i] . $nhex[$i + 1]));
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}
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// Calculate hash value
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$hash = sha1($nstr . $name);
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return sprintf('%08s-%04s-%04x-%04x-%12s',
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// 32 bits for "time_low"
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substr($hash, 0, 8),
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// 16 bits for "time_mid"
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substr($hash, 8, 4),
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// 16 bits for "time_hi_and_version",
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// four most significant bits holds version number 5
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(hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,
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// 16 bits, 8 bits for "clk_seq_hi_res",
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// 8 bits for "clk_seq_low",
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// two most significant bits holds zero and one for variant DCE1.1
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(hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
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// 48 bits for "node"
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substr($hash, 20, 12)
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);
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}
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public static function is_valid($uuid) {
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return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?' .
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'[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1;
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}
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}
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