linux/lib/uuid.c
Akinobu Mita cedddb0002 uuid: use prandom_bytes()
Use prandom_bytes() to generate 16 bytes of pseudo-random bytes.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-04-29 18:28:42 -07:00

47 lines
1.3 KiB
C

/*
* Unified UUID/GUID definition
*
* Copyright (C) 2009, Intel Corp.
* Huang Ying <ying.huang@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation;
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/uuid.h>
#include <linux/random.h>
static void __uuid_gen_common(__u8 b[16])
{
prandom_bytes(b, 16);
/* reversion 0b10 */
b[8] = (b[8] & 0x3F) | 0x80;
}
void uuid_le_gen(uuid_le *lu)
{
__uuid_gen_common(lu->b);
/* version 4 : random generation */
lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
}
EXPORT_SYMBOL_GPL(uuid_le_gen);
void uuid_be_gen(uuid_be *bu)
{
__uuid_gen_common(bu->b);
/* version 4 : random generation */
bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
}
EXPORT_SYMBOL_GPL(uuid_be_gen);