test(codes): compare QR with segno, decode QR dumps and the QR screenshot

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/test/codes/CodeCacheTest.mc b/test/codes/CodeCacheTest.mc
new file mode 100644
index 0000000..e09d902
--- /dev/null
+++ b/test/codes/CodeCacheTest.mc
@@ -0,0 +1,54 @@
+// Author:  cirakg & claude ai
+// Summary: Tests for the encrypted barcode matrix cache: round trip, keys of locked entries, invalidation and tampering.
+
+import Toybox.Lang;
+import Toybox.Test;
+
+(:test)
+function codeCacheRoundTripsAndInvalidates(logger as Test.Logger) as Boolean {
+    var store = new MemoryBackend();
+    var vault = new Vault(store, new FakeTime());
+    var e = StorageFixtures.code("QR card");
+    e.type = Codes.QR;
+    var id = vault.add(e);
+    var qr = Qr.encode("cache me", 1, 0, -1) as Qr.MatrixCode;
+    var matrix = new Codes.Matrix(qr.size, qr.size, 4, qr.modules);
+    vault.saveCodeCache(id, matrix.toBytes());
+    var back = Codes.Matrix.fromBytes(vault.loadCodeCache(id) as ByteArray);
+    var same = back != null && back.width == qr.size && back.quiet == 4 && Bytes.equal(back.modules, qr.modules);
+    // The cache is sealed: tampering gives no cache rather than a wrong code.
+    var stored = store.raw("x." + id) as ByteArray;
+    stored[stored.size() - 1] = stored[stored.size() - 1] ^ 1;
+    var tampered = vault.loadCodeCache(id) == null;
+    vault.saveCodeCache(id, matrix.toBytes());
+    var opened = vault.open(id);
+    vault.update(opened);
+    opened.wipeSecrets();
+    var clearedByUpdate = store.getValue("x." + id) == null;
+    vault.saveCodeCache(id, matrix.toBytes());
+    vault.remove(id);
+    return same && tampered && clearedByUpdate && store.getValue("x." + id) == null;
+}
+
+// A locked entry's cache uses the master key: unreadable while locked.
+(:test)
+function codeCacheOfLockedEntriesNeedsTheSession(logger as Test.Logger) as Boolean {
+    var vault = new Vault(new MemoryBackend(), new FakeTime());
+    StorageFixtures.setPin(vault, StorageFixtures.PIN);
+    var e = StorageFixtures.code("Locked QR");
+    e.type = Codes.QR;
+    e.locked = true;
+    var id = vault.add(e);
+    vault.saveCodeCache(id, [3, 1, 4, 0xE0]b);
+    vault.lock();
+    var code = 0;
+    try {
+        vault.loadCodeCache(id);
+    } catch (err instanceof VaultError) {
+        code = err.code;
+    }
+    StorageFixtures.unlock(vault, StorageFixtures.PIN);
+    var back = vault.loadCodeCache(id);
+    return code == VaultError.LOCKED && back != null && Bytes.equal(back, [3, 1, 4, 0xE0]b)
+        && Codes.Matrix.fromBytes([3, 1, 4, 0xE0]b) != null && Codes.Matrix.fromBytes([3, 1, 4]b) == null;
+}