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91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
/*
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* Copyright (c) 1993 Regents of the University of California.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* $Revision: 1.1 $
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* $Date: 2007/11/08 09:48:59 $
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*
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*/
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/*
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* LBL random number generator.
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*
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* Written by Steve McCanne & Chris Torek (mccanne@ee.lbl.gov,
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* torek@ee.lbl.gov), November, 1992.
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*
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* This implementation is based on ``Two Fast Implementations of
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* the "Minimal Standard" Random Number Generator", David G. Carta,
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* Communications of the ACM, Jan 1990, Vol 33 No 1.
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*/
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#include "config.h"
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#include "config_win32.h"
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#include "config_unix.h"
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#include "crypto/random.h"
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static uint32_t randseed = 1;
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void lbl_srandom(uint32_t seed)
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{
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randseed = seed;
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}
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uint32_t lbl_random(void)
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{
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#ifdef HAVE_DEV_URANDOM
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int fd, res, l;
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fd = open("/dev/urandom", O_RDONLY);
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if (fd == -1) {
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perror("Cannot open random sequence generator");
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abort();
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}
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l = read(fd, &res, sizeof(res));
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if (l != sizeof(res)) {
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perror("Cannot read random data");
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abort();
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}
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close(fd);
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return res;
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#else
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register uint32_t x = randseed;
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register uint32_t hi, lo, t;
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hi = x / 127773;
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lo = x % 127773;
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t = 16807 * lo - 2836 * hi;
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if (t <= 0)
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t += 0x7fffffff;
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randseed = t;
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return (t);
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#endif
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}
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