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