code: public OmemoFingerprint getOwnFingerprint()
              throws SmackException.NotLoggedInException, CorruptedOmemoKeyException {
          synchronized (LOCK) {
              if (getOwnJid() == null) {
                  throw new SmackException.NotLoggedInException();
              }
  
              return getOmemoService().getOmemoStoreBackend().getFingerprint(getOwnDevice());
          }
      }
docs: Return the fingerprint of our identity key.
  
  @return fingerprint
  @throws SmackException.NotLoggedInException if we don't know our bareJid yet.
  @throws CorruptedOmemoKeyException if our identityKey is corrupted.