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lib/util/arc4random_buf.c
65 строк
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Todd C. Miller
Remove Open Source PVS-Studio comments
28 сен 2025, 18:40
28 сен 2025, 18:40
2a33699
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/* * SPDX-License-Identifier: ISC * * Copyright (c) 2020 Todd C. Miller <Todd.Miller@sudo.ws> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <config.h> #ifndef HAVE_ARC4RANDOM_BUF #include <stdlib.h> #if defined(HAVE_STDINT_H) # include <stdint.h> #elif defined(HAVE_INTTYPES_H) # include <inttypes.h> #endif #include <sudo_compat.h> #include <sudo_rand.h> #define minimum(a, b) ((a) < (b) ? (a) : (b)) /* * Call arc4random() repeatedly to fill buf with n bytes of random data. */ void sudo_arc4random_buf(void *buf, size_t n) { char *cp = buf; while (n != 0) { size_t m = minimum(n, 4); uint32_t val = arc4random(); switch (m) { case 4: *cp++ = (val >> 24) & 0xff; FALLTHROUGH; case 3: *cp++ = (val >> 16) & 0xff; FALLTHROUGH; case 2: *cp++ = (val >> 8) & 0xff; FALLTHROUGH; case 1: *cp++ = val & 0xff; break; } n -= m; } } #endif /* HAVE_ARC4RANDOM_BUF */