From 6bb11e60b7a2dbf735e74cb8b8bf1a7c3e9509a0 Mon Sep 17 00:00:00 2001
From: Samuel <bummtschack@mail.de>
Date: Sun, 19 Jan 2025 18:56:43 +0100
Subject: [PATCH] fix: reset position before demanding new data for frame
 decryption

---
 src/lib.rs       | 4 ++--
 test/src/App.tsx | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 3b4614d..cba3b56 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -513,8 +513,6 @@ impl BackupDecryptor {
                 Err(e) => return Err(e),
             };
 
-            // if we got to an attachment, but there we demand more data, it will be faulty, because we try to decrypt the frame although we would need
-            // to decrypt the attachment
             match decrypt_frame(
                 &mut self.reader,
                 hmac,
@@ -524,6 +522,8 @@ impl BackupDecryptor {
                 frame_length,
             ) {
                 Ok(None) => {
+                    // here we have to reset as well because the hmac depends on the length decryption which should therefore happen next time on the correct bits
+                    self.reader.set_position(initial_reader_position);
                     return Ok(true);
                 }
                 Ok(Some(backup_frame)) => {
diff --git a/test/src/App.tsx b/test/src/App.tsx
index 934806f..b86955a 100644
--- a/test/src/App.tsx
+++ b/test/src/App.tsx
@@ -133,6 +133,7 @@ const App: Component = () => {
       <input
         type="file"
         id="backup-input"
+        accept=".backup"
         onChange={(event) => {
           setBackupFile(event.currentTarget.files?.[0]);
         }}