90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*-
|
|
* Copyright (c) 2016 embedded brains GmbH
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Newlib ports may override the default implementations via the following
|
|
* define and macros
|
|
* o _ARC4RANDOM_DATA,
|
|
* o _ARC4RANDOM_GETENTROPY_FAIL(),
|
|
* o _ARC4RANDOM_ALLOCATE(rsp, rspx), and
|
|
* o _ARC4RANDOM_FORKDETECT().
|
|
*/
|
|
#include <machine/_arc4random.h>
|
|
|
|
#include <sys/lock.h>
|
|
#include <signal.h>
|
|
|
|
#ifndef _ARC4_LOCK_INIT
|
|
|
|
#define _ARC4_LOCK_INIT __LOCK_INIT(static, _arc4random_mutex);
|
|
|
|
#define _ARC4_LOCK() __lock_acquire(_arc4random_mutex)
|
|
|
|
#define _ARC4_UNLOCK() __lock_release(_arc4random_mutex)
|
|
|
|
#endif /* _ARC4_LOCK_INIT */
|
|
|
|
_ARC4_LOCK_INIT
|
|
|
|
#ifdef _ARC4RANDOM_DATA
|
|
_ARC4RANDOM_DATA
|
|
#else
|
|
static struct {
|
|
struct _rs rs;
|
|
struct _rsx rsx;
|
|
} _arc4random_data;
|
|
#endif
|
|
|
|
static inline void
|
|
_getentropy_fail(void)
|
|
{
|
|
#ifdef _ARC4RANDOM_GETENTROPY_FAIL
|
|
_ARC4RANDOM_GETENTROPY_FAIL();
|
|
#else
|
|
raise(SIGKILL);
|
|
#endif
|
|
}
|
|
|
|
static inline int
|
|
_rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
|
|
{
|
|
#ifdef _ARC4RANDOM_ALLOCATE
|
|
_ARC4RANDOM_ALLOCATE(rsp, rsxp);
|
|
#else
|
|
*rsp = &_arc4random_data.rs;
|
|
*rsxp = &_arc4random_data.rsx;
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
static inline void
|
|
_rs_forkdetect(void)
|
|
{
|
|
#ifdef _ARC4RANDOM_FORKDETECT
|
|
_ARC4RANDOM_FORKDETECT();
|
|
#endif
|
|
}
|