LXR linux/lib/uuid.c

   1/*
   2 * Unified UUID/GUID definition
   3 *
   4 * Copyright (C) 2009, Intel Corp.
   5 *      Huang Ying <ying.huang@intel.com>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License version
   9 * 2 as published by the Free Software Foundation;
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21#include <linux/kernel.h>
  22#include <linux/export.h>
  23#include <linux/uuid.h>
  24#include <linux/random.h>
  25
  26static void __uuid_gen_common(__u8 b[16])
  27{
  28        prandom_bytes(b, 16);
  29        /* reversion 0b10 */
  30        b[8] = (b[8] & 0x3F) | 0x80;
  31}
  32
  33void uuid_le_gen(uuid_le *lu)
  34{
  35        __uuid_gen_common(lu->b);
  36        /* version 4 : random generation */
  37        lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
  38}
  39EXPORT_SYMBOL_GPL(uuid_le_gen);
  40
  41void uuid_be_gen(uuid_be *bu)
  42{
  43        __uuid_gen_common(bu->b);
  44        /* version 4 : random generation */
  45        bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
  46}
  47EXPORT_SYMBOL_GPL(uuid_be_gen);
  48