/** Encrypts a command to be sent to the recipient. */
public EncryptedCommand(Server sender, byte[] senderKey, Server recipient, String data) {
try {
this.iv = ByteUtilities.toHexString(Aes.generateIv());
// Nonce lists will be reset on app restart, but the serverID should be a new public key. This
// means the nonce lists should all be trying to talk to a new entry, and should all agree on
// the nonce.
// Set up the nonce
DecryptedPayload decryptedPayload = new DecryptedPayload();
if (!outgoingNonces.containsKey(recipient.getServerId())) {
outgoingNonces.put(recipient.getServerId(), 1L);
}
decryptedPayload.setNonce(outgoingNonces.get(recipient.getServerId()));
this.nonce = decryptedPayload.getNonce();
outgoingNonces.put(recipient.getServerId(), decryptedPayload.getNonce() + 1L);
decryptedPayload.setPayload(data);
data = ByteUtilities.toHexString(decryptedPayload.toJson().getBytes("UTF-8"));
this.sender = sender;
byte[] otherKey = ByteUtilities.toByteArray(recipient.getServerId());
byte[] sharedKey = Secp256k1.generateSharedSecret(senderKey, otherKey);
this.payload = Aes.encrypt(sharedKey, ByteUtilities.toByteArray(iv), data);
} catch (Exception e) {
LOGGER.error(null, e);
}
}
