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libreboot-utils: remove 1989 rand

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added as an academic exercise, but pointless
in the year 2026.

or even the year 1989.

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-25 10:36:50 +00:00
parent f7f1856969
commit a6da25ad0b
3 changed files with 1 additions and 94 deletions
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8
util/libreboot-utils/include/common.h
View File

@@ -26,7 +26,7 @@
#endif
#if !defined(HAVE_GETRANDOM)
#include <sys/syscall.h>
#if defined(SYS_getrandom)
#if !defined(SYS_getrandom)
#define HAVE_GETRANDOM_SYSCALL 1
#endif
#endif
@@ -396,18 +396,12 @@ int dcat(const char *s, size_t n,
unsigned short hextonum(char ch_s);
size_t rlong(void);
#if !(defined(FALLBACK_RAND_1989) && \
((FALLBACK_RAND_1989) > 0))
#if defined(__linux__)
#if defined(HAVE_GETRANDOM) || \
defined(HAVE_GETRANDOM_SYSCALL)
int fallback_rand_getrandom(void *buf, size_t len);
#endif
#endif
#else
size_t fallback_rand_1989(void);
size_t entropy_jitter(void);
#endif
/* Helper functions for command: dump
*/

8
util/libreboot-utils/lib/num.c
View File

@@ -13,10 +13,6 @@ TODO: properly handle errno in this file
#include <sys/param.h>
#endif
#include <sys/types.h>
#if defined(FALLBACK_RAND_1989) && \
(FALLBACK_RAND_1989) > 0
#include <sys/time.h>
#endif
#include <errno.h>
#if !((defined(__OpenBSD__) && (OpenBSD) >= 201) || \
@@ -27,10 +23,6 @@ TODO: properly handle errno in this file
#include <limits.h>
#include <stddef.h>
#include <string.h>
#if defined(FALLBACK_RAND_1989) && \
(FALLBACK_RAND_1989) > 0
#include <time.h>
#endif
#include <unistd.h>
#include "../include/common.h"

79
util/libreboot-utils/lib/rand.c
View File

@@ -11,10 +11,6 @@
#include <sys/param.h>
#endif
#include <sys/types.h>
#if defined(FALLBACK_RAND_1989) && \
(FALLBACK_RAND_1989) > 0
#include <sys/time.h>
#endif
#include <errno.h>
#if !((defined(__OpenBSD__) && (OpenBSD) >= 201) || \
@@ -25,10 +21,6 @@
#include <limits.h>
#include <stddef.h>
#include <string.h>
#if defined(FALLBACK_RAND_1989) && \
(FALLBACK_RAND_1989) > 0
#include <time.h>
#endif
#include <unistd.h>
#include "../include/common.h"
@@ -54,8 +46,6 @@
size_t
rlong(void)
{
#if !(defined(FALLBACK_RAND_1989) && \
((FALLBACK_RAND_1989) > 0))
#if (defined(__OpenBSD__) && (OpenBSD) >= 201) || \
defined(__FreeBSD__) || \
defined(__NetBSD__) || defined(__APPLE__)
@@ -278,74 +268,5 @@ fallback_rand_getrandom(void *buf, size_t len)
}
#endif
#endif
#else
size_t
fallback_rand_1989(void)
{
static size_t mix = 0;
static size_t counter = 0;
struct timeval tv;
/* nobody should use this
* (not crypto-safe)
*/
gettimeofday(&tv, NULL);
mix ^= (size_t)tv.tv_sec
^ (size_t)tv.tv_usec
^ (size_t)getpid()
^ (size_t)&mix
^ counter++
^ entropy_jitter();
/*
* Stack addresses can vary between
* calls, thus increasing entropy.
*/
mix ^= (size_t)&mix;
mix ^= (size_t)&tv;
mix ^= (size_t)&counter;
return mix;
}
size_t
entropy_jitter(void)
{
size_t mix;
struct timeval a, b;
ssize_t mix_diff;
int c;
mix = 0;
gettimeofday(&a, NULL);
for (c = 0; c < 32; c++) {
getpid();
gettimeofday(&b, NULL);
/*
* prevent negative numbers to prevent overflow,
* which would bias rand to large numbers
*/
mix_diff = (ssize_t)(b.tv_usec - a.tv_usec);
if (mix_diff < 0)
mix_diff = -mix_diff;
mix ^= (size_t)(mix_diff);
mix ^= (size_t)&mix;
}
return mix;
}
#endif
#endif