/application/helpers/classes/uuid.php
PHP | 159 lines | 52 code | 38 blank | 69 comment | 4 complexity | e679f908ec5b8045b15dd0815c854c33 MD5 | raw file
Possible License(s): LGPL-3.0
- <?php
- /**
- * UUID generator class
- *
- * Generates valid RFC 4211 compliant Universally Unique IDentifiers (UUID) version 3, 4 and 5.
- * UUIDs generated validate using the OSSP UUID Tool, and the output for named-based UUIDs are
- * exactly the same. This is a pure PHP implementation.
- *
- * Usage:
- *
- * Name-based UUID:
- *
- * $v3uuid = UUID::v3('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString');
- * $v5uuid = UUID::v5(UUID::NS_URL, 'http://www.google.com/');
- *
- * Pseudo-random UUID:
- *
- * $v4uuid = UUID::v4();
- *
- *
- * Originally found at: http://www.php.net/manual/en/function.uniqid.php#94959
- *
- * @author Andrew Moore
- *
- *
- * Modifications made by Henry Merriam <php@henrymerriam.com> on 2009-12-20:
- *
- * + Added constants for predefined namespaces as defined in RFC 4211 Appendix C.
- * + NS_DNS
- * + NS_URL
- * + NS_ISO_UID
- * + NS_X500_DN
- *
- * + Wrote this documentation comment.
- *
- */
- class UUID {
- const NS_DNS = '6ba7b810-9dad-11d1-80b4-00c04fd430c8'; // FQDN
- const NS_URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8'; // URL
- const NS_ISO_OID = '6ba7b812-9dad-11d1-80b4-00c04fd430c8'; // ISO OID
- const NS_X500_DN = '6ba7b814-9dad-11d1-80b4-00c04fd430c8'; // X.500 DN (in DER or a text output format)
- public static function v3($namespace, $name) {
- if(!self::is_valid($namespace)) return false;
- // Get hexadecimal components of namespace
- $nhex = str_replace(array('-','{','}'), '', $namespace);
- // Binary Value
- $nstr = '';
- // Convert Namespace UUID to bits
- for($i = 0; $i < strlen($nhex); $i+=2) {
- $nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
- }
- // Calculate hash value
- $hash = md5($nstr . $name);
- // Format and return UUID
- return sprintf('%08s-%04s-%04x-%04x-%12s',
- // 32 bits for "time_low"
- substr($hash, 0, 8),
- // 16 bits for "time_mid"
- substr($hash, 8, 4),
- // 16 bits for "time_hi_and_version",
- // four most significant bits holds version number 3
- (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x3000,
- // 16 bits, 8 bits for "clk_seq_hi_res",
- // 8 bits for "clk_seq_low",
- // two most significant bits holds zero and one for variant DCE1.1
- (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
- // 48 bits for "node"
- substr($hash, 20, 12)
- );
- }
- public static function v4() {
- return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
- // 32 bits for "time_low"
- mt_rand(0, 0xffff), mt_rand(0, 0xffff),
- // 16 bits for "time_mid"
- mt_rand(0, 0xffff),
- // 16 bits for "time_hi_and_version",
- // four most significant bits holds version number 4
- mt_rand(0, 0x0fff) | 0x4000,
- // 16 bits, 8 bits for "clk_seq_hi_res",
- // 8 bits for "clk_seq_low",
- // two most significant bits holds zero and one for variant DCE1.1
- mt_rand(0, 0x3fff) | 0x8000,
- // 48 bits for "node"
- mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
- );
- }
- public static function v5($namespace, $name) {
- if(!self::is_valid($namespace)) return false;
- // Get hexadecimal components of namespace
- $nhex = str_replace(array('-','{','}'), '', $namespace);
- // Binary Value
- $nstr = '';
- // Convert Namespace UUID to bits
- for($i = 0; $i < strlen($nhex); $i+=2) {
- $nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
- }
- // Calculate hash value
- $hash = sha1($nstr . $name);
- // Format and return UUID
- return sprintf('%08s-%04s-%04x-%04x-%12s',
- // 32 bits for "time_low"
- substr($hash, 0, 8),
- // 16 bits for "time_mid"
- substr($hash, 8, 4),
- // 16 bits for "time_hi_and_version",
- // four most significant bits holds version number 5
- (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,
- // 16 bits, 8 bits for "clk_seq_hi_res",
- // 8 bits for "clk_seq_low",
- // two most significant bits holds zero and one for variant DCE1.1
- (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
- // 48 bits for "node"
- substr($hash, 20, 12)
- );
- }
- public static function is_valid($uuid) {
- return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?'.
- '[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1;
- }
- }