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lbutils: support using arc4random on linux

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-DUSE_ARC4=1

use that

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-04-01 12:44:38 +01:00
parent 44004191cb
commit 4e72555ac7
2 changed files with 16 additions and 5 deletions
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util/libreboot-utils/lib/rand.c
+16 -4
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@@ -7,10 +7,17 @@
#ifndef RAND_H
#define RAND_H
#if defined(USE_URANDOM) && \
#if defined(USE_ARC4) && \
((USE_ARC4) > 0)
#define _DEFAULT_SOURCE 1 /* for arc4random on *linux* */
/* (not needed on bsd - on bsd,
it is used automatically unless
overridden with USE_URANDOM */
#elif defined(USE_URANDOM) && \
((USE_URANDOM) > 0)
#include <fcntl.h> /* if not arc4random: /dev/urandom */
#elif defined(__linux__)
#elif defined(__linux__) && \
!(defined(USE_ARC4) && ((USE_ARC4) > 0))
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
@@ -134,10 +141,15 @@ rset(void *buf, size_t n)
if (n == 0)
exitf("rset: zero-byte request");
#if (defined(__OpenBSD__) || defined(__FreeBSD__) || \
/* on linux, getrandom is recommended,
but you can pass -DUSE_ARC4=1 to use arc4random.
useful for portability testing from linux.
*/
#if (defined(USE_ARC4) && ((USE_ARC4) > 0)) || \
((defined(__OpenBSD__) || defined(__FreeBSD__) || \
defined(__NetBSD__) || defined(__APPLE__) || \
defined(__DragonFly__)) && !(defined(USE_URANDOM) && \
((USE_URANDOM) > 0))
((USE_URANDOM) > 0)))
arc4random_buf(buf, n);
#else