Update yarn-project/circuits.js/src/barretenberg/crypto/aes128/index.…

…test.ts Co-authored-by: Jan Beneš <[email protected]>
AztecProtocol · May 9, 2024 · 7c3c68a · 7c3c68a
1 parent 04a3bd0
commit 7c3c68a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/yarn-project/circuits.js/src/barretenberg/crypto/aes128/index.test.ts b/yarn-project/circuits.js/src/barretenberg/crypto/aes128/index.test.ts
@@ -20,6 +20,8 @@ describe('aes128', () => {
 
   // PKCS#7 padding removal
   const removePadding = (paddedBuffer: Buffer): Buffer => {
+    // We get padding length from the last byte - in PKCS#7 all the padded bytes contain padding length
+    // and there is always some padding.
     const paddingToRemove = paddedBuffer[paddedBuffer.length - 1];
     return paddedBuffer.subarray(0, paddedBuffer.length - paddingToRemove);
   };