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