Require mutable reference if method changes device state

Previously, all methods that access a Nitrokey device took a reference
to the device as input.  This method changes methods that change the
device state to require a mutable reference instead.  In most case,
this is straightforward as the method writes data to the device (for
example write_config or change_user_pin).  But there are two edge cases:
- Authenticating with a PIN changes the device state as it may decrease
  the PIN retry counter if the authentication fails.
- Generating an HOTP code changes the device state as it increases the
  HOTP counter.

1 files changed, 12 insertions, 6 deletions

diff --git a/tests/pws.rs b/tests/pws.rs
index 32dc8f7..7805803 100644
--- a/tests/pws.rs
+++ b/tests/pws.rs
@@ -33,7 +33,7 @@ fn get_slot_name_direct(slot: u8) -> Result<String, Error> {
     }
 }
 
-fn get_pws<T>(device: &T) -> PasswordSafe
+fn get_pws<T>(device: &mut T) -> PasswordSafe
 where
     T: Device,
 {
@@ -42,6 +42,7 @@ where
 
 #[test_device]
 fn enable(device: DeviceWrapper) {
+    let mut device = device;
     assert_cmd_err!(
         CommandError::WrongPassword,
         device.get_password_safe(&(USER_PASSWORD.to_owned() + "123"))
@@ -56,8 +57,9 @@ fn enable(device: DeviceWrapper) {
 
 #[test_device]
 fn drop(device: DeviceWrapper) {
+    let mut device = device;
     {
-        let pws = get_pws(&device);
+        let mut pws = get_pws(&mut device);
         assert_ok!((), pws.write_slot(1, "name", "login", "password"));
         assert_ok!("name".to_string(), pws.get_slot_name(1));
         let result = get_slot_name_direct(1);
@@ -72,7 +74,8 @@ fn drop(device: DeviceWrapper) {
 
 #[test_device]
 fn get_status(device: DeviceWrapper) {
-    let pws = get_pws(&device);
+    let mut device = device;
+    let mut pws = get_pws(&mut device);
     for i in 0..SLOT_COUNT {
         assert_ok!((), pws.erase_slot(i));
     }
@@ -93,7 +96,8 @@ fn get_status(device: DeviceWrapper) {
 
 #[test_device]
 fn get_data(device: DeviceWrapper) {
-    let pws = get_pws(&device);
+    let mut device = device;
+    let mut pws = get_pws(&mut device);
     assert_ok!((), pws.write_slot(1, "name", "login", "password"));
     assert_ok!("name".to_string(), pws.get_slot_name(1));
     assert_ok!("login".to_string(), pws.get_slot_login(1));
@@ -119,7 +123,8 @@ fn get_data(device: DeviceWrapper) {
 
 #[test_device]
 fn write(device: DeviceWrapper) {
-    let pws = get_pws(&device);
+    let mut device = device;
+    let mut pws = get_pws(&mut device);
 
     assert_lib_err!(
         LibraryError::InvalidSlot,
@@ -144,7 +149,8 @@ fn write(device: DeviceWrapper) {
 
 #[test_device]
 fn erase(device: DeviceWrapper) {
-    let pws = get_pws(&device);
+    let mut device = device;
+    let mut pws = get_pws(&mut device);
     assert_lib_err!(LibraryError::InvalidSlot, pws.erase_slot(SLOT_COUNT));
 
     assert_ok!((), pws.write_slot(0, "name", "login", "password"));