diff options
| -rw-r--r-- | drivers/firmware/efi/libstub/random.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/firmware/efi/libstub/random.c b/drivers/firmware/efi/libstub/random.c index 21e7e9325219..24aa37535372 100644 --- a/drivers/firmware/efi/libstub/random.c +++ b/drivers/firmware/efi/libstub/random.c @@ -25,6 +25,17 @@ union efi_rng_protocol { } mixed_mode; }; +/** + * efi_get_random_bytes() - fill a buffer with random bytes + * @size: size of the buffer + * @out: caller allocated buffer to receive the random bytes + * + * The call will fail if either the firmware does not implement the + * EFI_RNG_PROTOCOL or there are not enough random bytes available to fill + * the buffer. + * + * Return: status code + */ efi_status_t efi_get_random_bytes(unsigned long size, u8 *out) { efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID; @@ -38,6 +49,19 @@ efi_status_t efi_get_random_bytes(unsigned long size, u8 *out) return efi_call_proto(rng, get_rng, NULL, size, out); } +/** + * efi_random_get_seed() - provide random seed as configuration table + * + * The EFI_RNG_PROTOCOL is used to read random bytes. These random bytes are + * saved as a configuration table which can be used as entropy by the kernel + * for the initialization of its pseudo random number generator. + * + * If the EFI_RNG_PROTOCOL is not available or there are not enough random bytes + * available, the configuration table will not be installed and an error code + * will be returned. + * + * Return: status code + */ efi_status_t efi_random_get_seed(void) { efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID; |