mirror of https://github.com/sudo-project/sudo.git
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2020 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#ifndef HAVE_ARC4RANDOM_BUF
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#include <stdlib.h>
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#if defined(HAVE_STDINT_H)
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# include <stdint.h>
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#elif defined(HAVE_INTTYPES_H)
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# include <inttypes.h>
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#endif
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#include <sudo_compat.h>
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#include <sudo_rand.h>
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#define minimum(a, b) ((a) < (b) ? (a) : (b))
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/*
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* Call arc4random() repeatedly to fill buf with n bytes of random data.
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*/
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void
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sudo_arc4random_buf(void *buf, size_t n)
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{
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char *cp = buf;
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while (n != 0) {
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size_t m = minimum(n, 4);
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uint32_t val = arc4random();
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switch (m) {
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case 4:
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*cp++ = (val >> 24) & 0xff;
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FALLTHROUGH;
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case 3:
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*cp++ = (val >> 16) & 0xff;
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FALLTHROUGH;
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case 2:
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*cp++ = (val >> 8) & 0xff;
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FALLTHROUGH;
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case 1:
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*cp++ = val & 0xff;
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break;
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}
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n -= m;
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}
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}
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#endif /* HAVE_ARC4RANDOM_BUF */
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