Make the TOTP face use the filesystem for secret storage (#95)

* TOTP using filesystem

* Filesystem: ability to read files line by line

1 files changed, 26 insertions, 0 deletions

diff --git a/movement/watch_faces/complication/totp_face_lfs.h b/movement/watch_faces/complication/totp_face_lfs.h
new file mode 100644
index 00000000..0f388bc3
--- /dev/null
+++ b/movement/watch_faces/complication/totp_face_lfs.h
@@ -0,0 +1,26 @@
+#ifndef TOTP_FACE_LFS_H_
+#define TOTP_FACE_LFS_H_
+
+#include "movement.h"
+
+typedef struct {
+    uint32_t timestamp;
+    uint8_t steps;
+    uint32_t current_code;
+    uint8_t current_index;
+} totp_lfs_state_t;
+
+void totp_face_lfs_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
+void totp_face_lfs_activate(movement_settings_t *settings, void *context);
+bool totp_face_lfs_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void totp_face_lfs_resign(movement_settings_t *settings, void *context);
+
+#define totp_face_lfs ((const watch_face_t){ \
+    totp_face_lfs_setup, \
+    totp_face_lfs_activate, \
+    totp_face_lfs_loop, \
+    totp_face_lfs_resign, \
+    NULL, \
+})
+
+#endif // TOTP_FACE_LFS_H_