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// SPDX-License-Identifier: GPL-2.0+
/*
* efi_selftest_rng
*
* Copyright (c) 2019 Heinrich Schuchardt <xypron.glpk@gmx.de>
*
* Test the random number generator service.
*/
#include <efi_selftest.h>
#include <efi_rng.h>
#define RNG_LEN 9
static struct efi_boot_services *boottime;
static efi_guid_t efi_rng_guid = EFI_RNG_PROTOCOL_GUID;
/*
* Setup unit test.
*
* @handle: handle of the loaded image
* @systable: system table
* @return: EFI_ST_SUCCESS for success
*/
static int setup(const efi_handle_t handle,
const struct efi_system_table *systable)
{
boottime = systable->boottime;
return EFI_ST_SUCCESS;
}
/*
* Execute unit test.
*
* Retrieve available RNG algorithms.
* Retrieve two random values and compare them.
*
* @return: EFI_ST_SUCCESS for success
*/
static int execute(void)
{
efi_status_t ret;
efi_uintn_t size;
struct efi_rng_protocol *rng;
efi_guid_t *algo_list;
u8 rnd1[RNG_LEN] __aligned(4), rnd2[RNG_LEN] __aligned(4);
int r;
/* Get random number generator protocol */
ret = boottime->locate_protocol(&efi_rng_guid, NULL, (void **)&rng);
if (ret != EFI_SUCCESS) {
efi_st_error(
"Random number generator protocol not available\n");
return EFI_ST_FAILURE;
}
ret = rng->get_info(rng, &size, NULL);
if (ret != EFI_BUFFER_TOO_SMALL) {
efi_st_error("Could not retrieve alorithm list size\n");
return EFI_ST_FAILURE;
}
if (size < sizeof(efi_guid_t)) {
efi_st_error("Empty alorithm list\n");
return EFI_ST_FAILURE;
}
ret = boottime->allocate_pool(EFI_LOADER_DATA, size,
(void **)&algo_list);
if (ret != EFI_SUCCESS) {
efi_st_error("Could not allocate pool memory\n");
return EFI_ST_FAILURE;
}
ret = rng->get_info(rng, &size, algo_list);
if (ret != EFI_SUCCESS) {
efi_st_error("Could not get info\n");
return EFI_ST_FAILURE;
}
if (size < sizeof(efi_guid_t)) {
efi_st_error("Empty alorithm list\n");
return EFI_ST_FAILURE;
}
memset(rnd1, 0, RNG_LEN);
memset(rnd2, 0, RNG_LEN);
ret = rng->get_rng(rng, NULL, RNG_LEN - 1, &rnd1[1]);
if (ret != EFI_SUCCESS) {
efi_st_error("Could not get random value\n");
return EFI_ST_FAILURE;
}
ret = rng->get_rng(rng, algo_list, RNG_LEN - 1, &rnd2[1]);
if (ret != EFI_SUCCESS) {
efi_st_error("Could not get random value\n");
return EFI_ST_FAILURE;
}
r = memcmp(rnd1, rnd2, RNG_LEN);
if (!r) {
efi_st_error("Two equal consecutive random numbers\n");
return EFI_ST_FAILURE;
}
ret = boottime->free_pool(algo_list);
if (ret != EFI_SUCCESS) {
efi_st_error("Could not free pool memory\n");
return EFI_ST_FAILURE;
}
return EFI_ST_SUCCESS;
}
EFI_UNIT_TEST(rng) = {
.name = "random number generator",
.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
.setup = setup,
.execute = execute,
};
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