Support Firefox 46-47 intermediate standard

Author: marco-c

nodejs/ece.js

@@ -142,8 +142,13 @@ function deriveKeyAndNonce(params, mode) {
   var keyInfo;
   var nonceInfo;
   if (padSize === 1) {
-    keyInfo = 'Content-Encoding: aesgcm128';
-    nonceInfo = 'Content-Encoding: nonce';
+    if (params.authSecret) {
+      keyInfo = info('aesgcm128', s.context);
+      nonceInfo = info('nonce', s.context);
+    } else {
+      keyInfo = 'Content-Encoding: aesgcm128';
+      nonceInfo = 'Content-Encoding: nonce';
+    }
   } else if (padSize === 2) {
     keyInfo = info('aesgcm', s.context);
     nonceInfo = info('nonce', s.context);