Validate checksum during unscramble

ajhyndman · Sep 4, 2023 · 41a42ae · 41a42ae
1 parent 8740666
commit 41a42ae
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/scramble/scramble.ts b/src/scramble/scramble.ts
@@ -84,9 +84,11 @@ export function unscramble(puzzle: Puzzle, inputKey: string): Puzzle {
 
   const plainText = extractScrambleText(puzzle);
   const unscrambledText = unscrambleSolution(plainText, inputKey);
-  const unscrambledSolution = injectScrambleText(puzzle, unscrambledText);
 
-  // TODO: validate checksum
+  // validate checksum
+  invariant(puzzle.misc.scrambledChecksum === checksum(Buffer.from(unscrambledText, 'ascii')));
+
+  const unscrambledSolution = injectScrambleText(puzzle, unscrambledText);
 
   return {
     ...puzzle,