fix padding for medium group

ts/receiver/contentMessage.ts

@@ -21,6 +21,7 @@ import { StringUtils } from '../session/utils';
 import { UserUtil } from '../util';
 
 export async function handleContentMessage(envelope: EnvelopePlus) {
+  try {
     const plaintext = await decrypt(envelope, envelope.content);
 
     if (!plaintext) {
@@ -30,6 +31,9 @@ export async function handleContentMessage(envelope: EnvelopePlus) {
       return;
     }
     await innerHandleContentMessage(envelope, plaintext);
+  } catch (e) {
+    window.log.warn(e);
+  }
 }
 
 async function decryptForMediumGroup(
@@ -86,7 +90,7 @@ async function decryptForMediumGroup(
     sourceAsStr
   );
 
-  return plaintext;
+  return unpad(plaintext);
 }
 
 function unpad(paddedData: ArrayBuffer): ArrayBuffer {

ts/session/crypto/MessageEncrypter.ts

@@ -52,7 +52,7 @@ export async function encrypt(
   const plainText = padPlainTextBuffer(plainTextBuffer);
 
   if (encryptionType === EncryptionType.MediumGroup) {
-    return encryptForMediumGroup(device, plainTextBuffer);
+    return encryptForMediumGroup(device, plainText);
   }
 
   const address = new window.libsignal.SignalProtocolAddress(device.key, 1);

ts/session/messages/outgoing/content/data/ChatMessage.ts

@@ -108,7 +108,7 @@ export class ChatMessage extends DataMessage {
       }
       dataMessage.profile = profile;
     }
-    if (this.profileKey) {
+    if (this.profileKey && this.profileKey.length) {
       dataMessage.profileKey = this.profileKey;
     }
 

ts/session/messages/outgoing/content/data/ExpirationTimerUpdateMessage.ts

@@ -48,7 +48,7 @@ export class ExpirationTimerUpdateMessage extends DataMessage {
     if (this.expireTimer) {
       data.expireTimer = this.expireTimer;
     }
-    if (this.profileKey) {
+    if (this.profileKey && this.profileKey.length) {
       data.profileKey = this.profileKey;
     }