mirror of
https://github.com/owncloudarchive/contacts.git
synced 2024-12-02 14:24:10 +01:00
71 lines
2.2 KiB
PHP
71 lines
2.2 KiB
PHP
<?php
|
|
namespace OCA\Contacts\Utils;
|
|
|
|
class UUID {
|
|
|
|
protected $urand;
|
|
|
|
public function __construct() {
|
|
$this->urand = @fopen ( '/dev/urandom', 'rb' );
|
|
}
|
|
|
|
/**
|
|
* @brief Generates a Universally Unique IDentifier, version 4.
|
|
*
|
|
* This function generates a truly random UUID. The built in CakePHP String::uuid() function
|
|
* is not cryptographically secure. You should uses this function instead.
|
|
* From http://php.net/manual/en/function.uniqid.php comments
|
|
*
|
|
* @see http://tools.ietf.org/html/rfc4122#section-4.4
|
|
* @see http://en.wikipedia.org/wiki/UUID
|
|
* @return string A UUID, made up of 32 hex digits and 4 hyphens.
|
|
*/
|
|
function get() {
|
|
|
|
$pr_bits = false;
|
|
if (is_a($this, 'uuid')) {
|
|
if (is_resource($this->urand)) {
|
|
$pr_bits .= @fread($this->urand, 16);
|
|
}
|
|
}
|
|
if (!$pr_bits) {
|
|
$fp = @fopen('/dev/urandom', 'rb');
|
|
if ($fp !== false) {
|
|
$pr_bits .= @fread($fp, 16);
|
|
@fclose ( $fp );
|
|
} else {
|
|
// If /dev/urandom isn't available (eg: in non-unix systems), use mt_rand().
|
|
$pr_bits = "";
|
|
for($cnt = 0; $cnt < 16; $cnt ++) {
|
|
$pr_bits .= chr(mt_rand(0, 255));
|
|
}
|
|
}
|
|
}
|
|
$time_low = bin2hex(substr($pr_bits, 0, 4));
|
|
$time_mid = bin2hex(substr($pr_bits, 4, 2));
|
|
$time_hi_and_version = bin2hex(substr($pr_bits, 6, 2));
|
|
$clock_seq_hi_and_reserved = bin2hex(substr($pr_bits, 8, 2));
|
|
$node = bin2hex(substr($pr_bits, 10, 6));
|
|
|
|
/**
|
|
* Set the four most significant bits (bits 12 through 15) of the
|
|
* time_hi_and_version field to the 4-bit version number from
|
|
* Section 4.1.3.
|
|
* @see http://tools.ietf.org/html/rfc4122#section-4.1.3
|
|
*/
|
|
$time_hi_and_version = hexdec($time_hi_and_version);
|
|
$time_hi_and_version = $time_hi_and_version >> 4;
|
|
$time_hi_and_version = $time_hi_and_version | 0x4000;
|
|
|
|
/**
|
|
* Set the two most significant bits (bits 6 and 7) of the
|
|
* clock_seq_hi_and_reserved to zero and one, respectively.
|
|
*/
|
|
$clock_seq_hi_and_reserved = hexdec($clock_seq_hi_and_reserved);
|
|
$clock_seq_hi_and_reserved = $clock_seq_hi_and_reserved >> 2;
|
|
$clock_seq_hi_and_reserved = $clock_seq_hi_and_reserved | 0x8000;
|
|
|
|
return sprintf('%08s-%04s-%04x-%04x-%012s', $time_low, $time_mid, $time_hi_and_version, $clock_seq_hi_and_reserved, $node);
|
|
}
|
|
|
|
} |