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namespace Commercetools\Core\Helper;
class Uuid
{
/**
* return bool
*/
public static function active()
{
return function_exists('random_bytes');
}
/**
* Return a UUID (version 4) using random bytes
* Note that version 4 follows the format:
* xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
* where y is one of: [8, 9, A, B]
*
* We use (random_bytes(1) & 0x0F) | 0x40 to force
* the first character of hex value to always be 4
* in the appropriate position.
*
* For 4: http://3v4l.org/q2JN9
* For Y: http://3v4l.org/EsGSU
* For the whole shebang: http://3v4l.org/BkjBc
*
* @link https://paragonie.com/b/JvICXzh_jhLyt4y3
* @link https://creativecommons.org/licenses/by-sa/4.0/
*
* @return string
*/
public static function uuidv4()
{
return implode('-', [
bin2hex(random_bytes(4)),
bin2hex(random_bytes(2)),
bin2hex(chr((ord(random_bytes(1)) & 0x0F) | 0x40)) . bin2hex(random_bytes(1)),
bin2hex(chr((ord(random_bytes(1)) & 0x3F) | 0x80)) . bin2hex(random_bytes(1)),
bin2hex(random_bytes(6))
]);
}
}