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.g...@gmx.de>
---
The patch depends on pending patches to implement the EFI_RNG_PROTOCOL.
---
lib/efi_selftest/Makefile | 1 +
lib/efi_selftest/efi_selftest_rng.c | 111 ++++++++++++++++++++++++++++
2 files changed, 112 insertions(+)
create mode 100644 lib/efi_selftest/efi_selftest_rng.c
diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index 487cb4c674..3ad96e1cbf 100644
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -47,6 +47,7 @@ efi_selftest_unicode_collation.o
obj-$(CONFIG_CPU_V7) += efi_selftest_unaligned.o
obj-$(CONFIG_EFI_LOADER_HII) += efi_selftest_hii.o
+obj-$(CONFIG_EFI_RNG_PROTOCOL) += efi_selftest_rng.o
obj-$(CONFIG_EFI_GET_TIME) += efi_selftest_rtc.o
ifeq ($(CONFIG_GENERATE_ACPI_TABLE),)
diff --git a/lib/efi_selftest/efi_selftest_rng.c
b/lib/efi_selftest/efi_selftest_rng.c
new file mode 100644
index 0000000000..06e1635515
--- /dev/null
+++ b/lib/efi_selftest/efi_selftest_rng.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * efi_selftest_rng
+ *
+ * Copyright (c) 2019 Heinrich Schuchardt <xypron.g...@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, NULL, 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;
+ }
+
+ return EFI_ST_SUCCESS;
+}
+
+EFI_UNIT_TEST(rng) = {
+ .name = "random number generator",
+ .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
+ .setup = setup,
+ .execute = execute,
+};
--
2.24.1
