/** * Receive the serialized message from the current 1-out-of-2 OT. * * @param choiceBit * Choice-bit. False for message 0, true for message 1. * @return The serialized message from the OT */ public byte[] receive(boolean choiceBit) { // Check if there is still an unused random OT stored, if not, execute a // random OT extension if (offset < 0 || offset >= batchSize) { choices = new StrictBitVector(batchSize, resources.getRandomGenerator()); randomMessages = receiver.extend(choices); offset = 0; } // Notify the sender if it should switch the 0 and 1 messages around (s.t. // the random choice bit in the preprocessed random OTs matches the true // choice bit sendSwitchBit(choiceBit); // Receive the serialized adjusted messages byte[] zeroAdjustment = network.receive(resources.getOtherId()); byte[] oneAdjustment = network.receive(resources.getOtherId()); byte[] res = doActualReceive(zeroAdjustment, oneAdjustment); offset++; return res; }