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f74cf1350e
According to the OpenBSD man page, "A Replacement Call for Random". It offers high quality random numbers derived from input data obtained by the OpenBSD specific getentropy() system call which is declared in <unistd.h> and must be implemented for each Newlib port externally. The arc4random() functions are used for example in LibreSSL and OpenSSH. Cygwin provides currently its own implementation of the arc4random family. Maybe it makes sense to use this getentropy() implementation: http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libcrypto/crypto/getentropy_win.c?rev=1.4&content-type=text/x-cvsweb-markup * libc/include/stdlib.h (arc4random): Declare if __BSD_VISIBLE. (arc4random_buf): Likewise. (arc4random_uniform): Likewise. * libc/include/sys/unistd.h (getentropy): Likewise. * libc/include/machine/_arc4random.h: New file. * libc/stdlib/arc4random.c: Likewise. * libc/stdlib/arc4random.h: Likewise. * libc/stdlib/arc4random_uniform.c: Likewise. * libc/stdlib/chacha_private.h: Likewise. * libc/sys/rtems/include/machine/_arc4random.h: Likewise. * libc/stdlib/Makefile.am (EXTENDED_SOURCES): Add arc4random.c and arc4random_uniform.c. * libc/stdlib/Makefile.in: Regenerate.
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/*-
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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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