docs: public OmemoFingerprint getFingerprintAndMaybeBuildSession(OmemoManager.LoggedInOmemoManager managerGuard, OmemoDevice contactsDevice)
              throws CannotEstablishOmemoSessionException, CorruptedOmemoKeyException,
              SmackException.NotConnectedException, InterruptedException, SmackException.NoResponseException {
          OmemoManager omemoManager = managerGuard.get();
  
          // Load identityKey
          T_IdKey identityKey = loadOmemoIdentityKey(omemoManager.getOwnDevice(), contactsDevice);
          if (identityKey == null) {
              // Key cannot be loaded. Maybe it doesn't exist. Fetch a bundle to get it...
              OmemoService.getInstance().buildFreshSessionWithDevice(omemoManager.getConnection(),
                      omemoManager.getOwnDevice(), contactsDevice);
          }
  
          // Load identityKey again
          identityKey = loadOmemoIdentityKey(omemoManager.getOwnDevice(), contactsDevice);
          if (identityKey == null) {
              return null;
          }
  
          return keyUtil().getFingerprintOfIdentityKey(identityKey);
      }