Add set_encrypted_volume_mode method to Storage

Previously, we considered this command as unsupported as it only was
available with firmware version 0.49.  But as discussed in nitrocli
issue 80 [0], it will probably be re-enabled in future firmware
versions.  Therefore this patch adds the set_encrypted_volume_mode to
Storage.

[0] https://github.com/d-e-s-o/nitrocli/issues/80

1 files changed, 46 insertions, 1 deletions

diff --git a/src/device.rs b/src/device.rs
index d199d9a..c985802 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -1142,7 +1142,7 @@ impl Storage {
     ///
     /// # fn try_main() -> Result<(), Error> {
     /// let device = nitrokey::Storage::connect()?;
-    /// match device.set_unencrypted_volume_mode("123456", VolumeMode::ReadWrite) {
+    /// match device.set_unencrypted_volume_mode("12345678", VolumeMode::ReadWrite) {
     ///     Ok(()) => println!("Set the unencrypted volume to read-write mode."),
     ///     Err(err) => eprintln!("Could not set the unencrypted volume to read-write mode: {}", err),
     /// };
@@ -1169,6 +1169,51 @@ impl Storage {
         get_command_result(result)
     }
 
+    /// Sets the access mode of the encrypted volume.
+    ///
+    /// This command will reconnect the encrypted volume so buffers should be flushed before
+    /// calling it.  It is only available in firmware version 0.49.
+    ///
+    /// # Errors
+    ///
+    /// - [`InvalidString`][] if the provided password contains a null byte
+    /// - [`WrongPassword`][] if the provided admin password is wrong
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// # use nitrokey::Error;
+    /// use nitrokey::VolumeMode;
+    ///
+    /// # fn try_main() -> Result<(), Error> {
+    /// let device = nitrokey::Storage::connect()?;
+    /// match device.set_encrypted_volume_mode("12345678", VolumeMode::ReadWrite) {
+    ///     Ok(()) => println!("Set the encrypted volume to read-write mode."),
+    ///     Err(err) => eprintln!("Could not set the encrypted volume to read-write mode: {}", err),
+    /// };
+    /// #     Ok(())
+    /// # }
+    /// ```
+    ///
+    /// [`InvalidString`]: enum.LibraryError.html#variant.InvalidString
+    /// [`WrongPassword`]: enum.CommandError.html#variant.WrongPassword
+    pub fn set_encrypted_volume_mode(
+        &self,
+        admin_pin: &str,
+        mode: VolumeMode,
+    ) -> Result<(), Error> {
+        let admin_pin = get_cstring(admin_pin)?;
+        let result = match mode {
+            VolumeMode::ReadOnly => unsafe {
+                nitrokey_sys::NK_set_encrypted_read_only(admin_pin.as_ptr())
+            },
+            VolumeMode::ReadWrite => unsafe {
+                nitrokey_sys::NK_set_encrypted_read_write(admin_pin.as_ptr())
+            },
+        };
+        get_command_result(result)
+    }
+
     /// Returns the status of the connected storage device.
     ///
     /// # Example