tests: bluetooth: fast_pair: storage: add eik to factory reset

Added the Ephemeral Identity Key (EIK) storage item from the Find My
Device Network extension to the Fast Pair Storage factory reset test
suite.

Signed-off-by: Kamil Piszczek <[email protected]>

Author: kapi-no

tests/subsys/bluetooth/fast_pair/storage/factory_reset/Kconfig

@@ -10,6 +10,12 @@ config BT_FAST_PAIR_STORAGE_FMDN_CLOCK
 	  Unit test enables this option to be able to use API of the Beacon Clock used in the FMDN
 	  extension.
 
+config BT_FAST_PAIR_STORAGE_FMDN_EIK
+	default y
+	help
+	  Unit test enables this option to be able to use API of the Ephemeral Identity Key (EIK)
+	  used in the FMDN extension.
+
 config BT_FAST_PAIR_STORAGE_PN
 	default y
 	help

tests/subsys/bluetooth/fast_pair/storage/factory_reset/src/main.c

@@ -16,6 +16,8 @@ LOG_MODULE_REGISTER(test_main);
 #include "fp_storage_ak_priv.h"
 #include "fp_storage_clock.h"
 #include "fp_storage_clock_priv.h"
+#include "fp_storage_eik.h"
+#include "fp_storage_eik_priv.h"
 #include "fp_storage_pn.h"
 #include "fp_storage_pn_priv.h"
 #include "fp_storage_manager.h"
@@ -191,10 +193,30 @@ static void fp_ram_clear(void)
 {
 	fp_storage_ak_ram_clear();
 	fp_storage_clock_ram_clear();
+	fp_storage_eik_ram_clear();
 	fp_storage_pn_ram_clear();
 	fp_storage_manager_ram_clear();
 }
 
+static void fp_storage_validate_unloaded_eik(void)
+{
+	int err;
+	int ret;
+	uint8_t eik[FP_STORAGE_EIK_LEN];
+
+	err = fp_storage_eik_save(eik);
+	zassert_equal(err, -EACCES, "Expected error before settings load");
+
+	err = fp_storage_eik_delete();
+	zassert_equal(err, -EACCES, "Expected error before settings load");
+
+	ret = fp_storage_eik_is_provisioned();
+	zassert_equal(ret, -EACCES, "Expected error before settings load");
+
+	err = fp_storage_eik_get(eik);
+	zassert_equal(err, -EACCES, "Expected error before settings load");
+}
+
 static void fp_storage_validate_unloaded(void)
 {
 	int err;
@@ -210,6 +232,8 @@ static void fp_storage_validate_unloaded(void)
 	zassert_equal(err, -EACCES, "Expected error before settings load");
 	err = fp_storage_clock_current_checkpoint_get(&clock_checkpoint);
 	zassert_equal(err, -EACCES, "Expected error before settings load");
+
+	fp_storage_validate_unloaded_eik();
 }
 
 static void before_fn(void *f)
@@ -334,6 +358,28 @@ static void clock_checkpoint_validate_loaded(uint32_t clock_current, uint32_t cl
 	zassert_equal(clock_checkpoint, clock_current, "Invalid clock current checkpoint");
 }
 
+static void eik_store(const uint8_t *eik)
+{
+	int err;
+
+	err = fp_storage_eik_save(eik);
+	zassert_ok(err, "Unexpected error in EIK store operation");
+}
+
+static void eik_validate_loaded(const uint8_t *eik)
+{
+	int err;
+	int ret;
+	uint8_t eik_loaded[FP_STORAGE_EIK_LEN];
+
+	ret = fp_storage_eik_is_provisioned();
+	zassert_equal(ret, 1, "EIK unprovisioned or unexpected error during state check");
+
+	err = fp_storage_eik_get(eik_loaded);
+	zassert_ok(err, "Unexpected error in EIK get");
+	zassert_mem_equal(eik_loaded, eik, sizeof(eik_loaded), "Invalid EIK");
+}
+
 static void fp_storage_validate_empty(void)
 {
 	int err;
@@ -342,6 +388,7 @@ static void fp_storage_validate_empty(void)
 	struct fp_account_key account_key_list[ACCOUNT_KEY_MAX_CNT];
 	size_t read_cnt = ACCOUNT_KEY_MAX_CNT;
 	uint32_t clock_checkpoint;
+	uint8_t eik[FP_STORAGE_EIK_LEN];
 
 	err = settings_validate(fp_settings_data_validate_empty_cb);
 	zassert_ok(err, "Non-volatile Fast Pair data storage is not empty after reset");
@@ -359,6 +406,11 @@ static void fp_storage_validate_empty(void)
 	zassert_ok(err, "Unexpected error in clock current checkpoint get");
 	zassert_equal(clock_checkpoint, 0, "Invalid clock current checkpoint");
 
+	ret = fp_storage_eik_is_provisioned();
+	zassert_equal(ret, 0, "Expected unprovisioned EIK");
+	err = fp_storage_eik_get(eik);
+	zassert_equal(err, -ENODATA, "Expected no EIK data");
+
 	err = fp_storage_pn_get(read_name);
 	zassert_ok(err, "Unexpected error in name get");
 	ret = strcmp(read_name, "");
@@ -373,17 +425,25 @@ static void fp_storage_self_test_run(void)
 	static const uint32_t clock_current = 0xDEADBEEF;
 	static const uint32_t clock_boot_first;
 	static const uint32_t clock_boot_second = clock_current;
+	static const uint8_t eik[FP_STORAGE_EIK_LEN] = {
+		0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF,
+		0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF,
+		0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF,
+		0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF,
+	};
 	int err;
 
 	fp_storage_validate_empty();
 
 	cu_account_keys_generate_and_store(seed, key_count);
 	personalized_name_store(name);
 	clock_checkpoint_store(clock_current);
+	eik_store(eik);
 
 	cu_account_keys_validate_loaded(seed, key_count);
 	personalized_name_validate_loaded(name);
 	clock_checkpoint_validate_loaded(clock_current, clock_boot_first);
+	eik_validate_loaded(eik);
 
 	fp_ram_clear();
 	fp_storage_validate_unloaded();
@@ -395,6 +455,7 @@ static void fp_storage_self_test_run(void)
 	cu_account_keys_validate_loaded(seed, key_count);
 	personalized_name_validate_loaded(name);
 	clock_checkpoint_validate_loaded(clock_current, clock_boot_second);
+	eik_validate_loaded(eik);
 }
 
 ZTEST(suite_fast_pair_storage_factory_reset_01, test_01_store)
@@ -411,15 +472,23 @@ static void store_data_and_factory_reset(void)
 	static const char *name = "store_data_and_factory_reset";
 	static const uint32_t clock_current = 0xDEADBEEF;
 	static const uint32_t clock_boot;
+	static const uint8_t eik[FP_STORAGE_EIK_LEN] = {
+		0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF,
+		0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF,
+		0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF,
+		0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF,
+	};
 	int err;
 
 	cu_account_keys_generate_and_store(seed, key_count);
 	personalized_name_store(name);
 	clock_checkpoint_store(clock_current);
+	eik_store(eik);
 
 	cu_account_keys_validate_loaded(seed, key_count);
 	personalized_name_validate_loaded(name);
 	clock_checkpoint_validate_loaded(clock_current, clock_boot);
+	eik_validate_loaded(eik);
 
 	err = fp_storage_factory_reset();
 	zassert_ok(err, "Unexpected error in factory reset");