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Add padding for push messages.

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1) Use 'bit padding.'

1) By default, pad at 160 byte increments.
This commit is contained in:
Moxie Marlinspike
2014-07-09 14:36:01 -07:00
parent fcaa3f0d73
commit 07fd17ccda
5 changed files with 77 additions and 7 deletions
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5
src/org/thoughtcrime/securesms/transport/PushTransport.java
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@@ -52,6 +52,7 @@ import org.whispersystems.textsecure.push.PushAttachmentPointer;
import org.whispersystems.textsecure.push.PushBody;
import org.whispersystems.textsecure.push.PushMessageProtos.PushMessageContent;
import org.whispersystems.textsecure.push.PushServiceSocket;
import org.whispersystems.textsecure.push.PushTransportDetails;
import org.whispersystems.textsecure.push.StaleDevices;
import org.whispersystems.textsecure.push.StaleDevicesException;
import org.whispersystems.textsecure.push.UnregisteredUserException;
@@ -344,8 +345,10 @@ public class PushTransport extends BaseTransport {
}
}
int sessionVersion = SessionUtil.getSessionVersion(context, masterSecret, pushAddress);
SessionCipher cipher = SessionCipherFactory.getInstance(context, masterSecret, pushAddress);
CiphertextMessage message = cipher.encrypt(plaintext);
byte[] paddedPlaintext = new PushTransportDetails(sessionVersion).getPaddedMessageBody(plaintext);
CiphertextMessage message = cipher.encrypt(paddedPlaintext);
int remoteRegistrationId = cipher.getRemoteRegistrationId();
if (message.getType() == CiphertextMessage.PREKEY_TYPE) {