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