fixup! crypto: refactor WebCrypto AEAD algorithms auth tag handling

Author: panva

lib/internal/crypto/aes.js

@@ -140,6 +140,7 @@ function asyncAesKwCipher(mode, key, data) {
 
 function asyncAesGcmCipher(mode, key, data, algorithm) {
   const { tagLength = 128 } = algorithm;
+  const tagByteLength = tagLength / 8;
 
   return jobPromise(() => new AESCipherJob(
     kCryptoJobAsync,
@@ -148,12 +149,13 @@ function asyncAesGcmCipher(mode, key, data, algorithm) {
     data,
     getVariant('AES-GCM', key[kAlgorithm].length),
     algorithm.iv,
-    tagLength / 8,
+    tagByteLength,
     algorithm.additionalData));
 }
 
 function asyncAesOcbCipher(mode, key, data, algorithm) {
   const { tagLength = 128 } = algorithm;
+  const tagByteLength = tagLength / 8;
 
   return jobPromise(() => new AESCipherJob(
     kCryptoJobAsync,
@@ -162,7 +164,7 @@ function asyncAesOcbCipher(mode, key, data, algorithm) {
     data,
     getVariant('AES-OCB', key.algorithm.length),
     algorithm.iv,
-    tagLength / 8,
+    tagByteLength,
     algorithm.additionalData));
 }