diff options
| author | Matthias Brugger <mbrugger@suse.com> | 2020-12-18 12:28:03 +0300 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-01-19 17:15:02 +0300 |
| commit | 92fdad28cfdf078fe34c198ef430933e7b2825a1 (patch) | |
| tree | e5a6dec70cb67885d0c575b387472b869ca02d54 /lib | |
| parent | 0be3d1fafb54bc2fd3d5862304528d7a21e500d9 (diff) | |
| download | u-boot-92fdad28cfdf078fe34c198ef430933e7b2825a1.tar.xz | |
lib: uuid: use RNG device if present
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>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/uuid.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/lib/uuid.c b/lib/uuid.c index 54a93aacc9..5bc68674d0 100644 --- a/lib/uuid.c +++ b/lib/uuid.c @@ -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; - - srand(get_ticks() + rand()); + int i, ret; + struct udevice *devp; + u32 randv = 0; + + 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++) |