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lib: uuid: use RNG device if present

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When calculating a random UUID we use a weak seed.
Use a RNG device if present to increase entropy.

Signed-off-by: Matthias Brugger <mbrugger@suse.com>
Reviewed-by: Torsten Duwe <duwe@suse.de>
This commit is contained in:
Matthias Brugger
2020-12-18 10:28:03 +01:00
committed by Tom Rini
parent 0be3d1fafb
commit 92fdad28cf
1 changed files with 17 additions and 2 deletions
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19
lib/uuid.c
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@@ -15,6 +15,8 @@
#include <asm/io.h>
#include <part_efi.h>
#include <malloc.h>
#include <dm/uclass.h>
#include <rng.h>
/*
* UUID - Universally Unique IDentifier - 128 bits unique number.
@@ -249,9 +251,22 @@ void gen_rand_uuid(unsigned char *uuid_bin)
{
u32 ptr[4];
struct uuid *uuid = (struct uuid *)ptr;
int i;
int i, ret;
struct udevice *devp;
u32 randv = 0;
srand(get_ticks() + rand());
if (IS_ENABLED(CONFIG_DM_RNG)) {
ret = uclass_get_device(UCLASS_RNG, 0, &devp);
if (ret) {
ret = dm_rng_read(devp, &randv, sizeof(randv));
if (ret < 0)
randv = 0;
}
}
if (randv)
srand(randv);
else
srand(get_ticks() + rand());
/* Set all fields randomly */
for (i = 0; i < 4; i++)