test(core): add tests for device_secret and cred_auth_key_counter

[no changelog]

core/tests/test_storage.py

@@ -1,13 +1,15 @@
 from common import *  # isort:skip
 
 from storage import device
-from trezor import config
+from trezor import config, utils
-
 
 class TestConfig(unittest.TestCase):
-    def test_counter(self):
+
+    def setUp(self):
         config.init()
         config.wipe()
+
+    def test_u2f_counter(self):
         for i in range(150):
             self.assertEqual(device.next_u2f_counter(), i)
         device.set_u2f_counter(350)
@@ -16,6 +18,45 @@ class TestConfig(unittest.TestCase):
         device.set_u2f_counter(0)
         self.assertEqual(device.next_u2f_counter(), 1)
 
+    if utils.USE_THP:
+
+        def test_cred_auth_key_counter(self):
+            rounds = 200
+            for i in range(rounds):
+                self.assertEqual(
+                    device.get_cred_auth_key_counter(), i.to_bytes(4, "big")
+                )
+                device.increment_cred_auth_key_counter()
+
+            # Test get_cred_auth_key_counter does not change the counter value
+            self.assertEqual(
+                device.get_cred_auth_key_counter(), rounds.to_bytes(4, "big")
+            )
+            self.assertEqual(
+                device.get_cred_auth_key_counter(), rounds.to_bytes(4, "big")
+            )
+
+        def test_cred_auth_key_counter_overflow(self):
+            from storage import common
+            from storage.device import _NAMESPACE, _CRED_AUTH_KEY_COUNTER
+
+            common.set(_NAMESPACE, _CRED_AUTH_KEY_COUNTER, b"\xff\xff\xff\xfe")
+            device.increment_cred_auth_key_counter()
+            self.assertEqual(device.get_cred_auth_key_counter(), b"\xff\xff\xff\xff")
+            with self.assertRaises(AssertionError) as e:
+                device.increment_cred_auth_key_counter()
+            self.assertEqual(e.value.value, "Overflow of cred_auth_key_counter")
+
+        def test_device_secret(self):
+            secret1 = device.get_device_secret()
+            self.assertEqual(len(secret1), 16)
+            secret2 = device.get_device_secret()
+            self.assertEqual(secret1, secret2)
+            config.wipe()
+            secret3 = device.get_device_secret()
+            self.assertEqual(len(secret3), 16)
+            self.assertNotEqual(secret1, secret3)
+
 
 if __name__ == "__main__":
     unittest.main()