/**
* Encrypt a message.
*
* @param paddedMessage The plaintext message bytes, optionally padded to a constant multiple.
* @return A ciphertext message encrypted to the recipient+device tuple.
*/
public CiphertextMessage encrypt(byte[] paddedMessage)
{
lock (SESSION_LOCK)
{
SessionRecord sessionRecord = sessionStore.loadSession(remoteAddress);
SessionState sessionState = sessionRecord.getSessionState();
ChainKey chainKey = sessionState.getSenderChainKey();
MessageKeys messageKeys = chainKey.getMessageKeys();
ECPublicKey senderEphemeral = sessionState.getSenderRatchetKey();
uint previousCounter = sessionState.getPreviousCounter();
uint sessionVersion = sessionState.getSessionVersion();
byte[] ciphertextBody = getCiphertext(sessionVersion, messageKeys, paddedMessage);
CiphertextMessage ciphertextMessage = new WhisperMessage(sessionVersion, messageKeys.getMacKey(),
senderEphemeral, chainKey.getIndex(),
previousCounter, ciphertextBody,
sessionState.getLocalIdentityKey(),
sessionState.getRemoteIdentityKey());
if (sessionState.hasUnacknowledgedPreKeyMessage())
{
SessionState.UnacknowledgedPreKeyMessageItems items = sessionState.getUnacknowledgedPreKeyMessageItems();
uint localRegistrationId = sessionState.getLocalRegistrationId();
ciphertextMessage = new PreKeyWhisperMessage(sessionVersion, localRegistrationId, items.getPreKeyId(),
items.getSignedPreKeyId(), items.getBaseKey(),
sessionState.getLocalIdentityKey(),
(WhisperMessage)ciphertextMessage);
}
sessionState.setSenderChainKey(chainKey.getNextChainKey());
sessionStore.storeSession(remoteAddress, sessionRecord);
return(ciphertextMessage);
}
}
/**
* Encrypt a message.
*
* @param paddedMessage The plaintext message bytes, optionally padded to a constant multiple.
* @return A ciphertext message encrypted to the recipient+device tuple.
*/
public CiphertextMessage encrypt(byte[] paddedMessage)
{
lock (SESSION_LOCK)
{
SessionRecord sessionRecord = sessionStore.LoadSession(remoteAddress);
SessionState sessionState = sessionRecord.getSessionState();
ChainKey chainKey = sessionState.getSenderChainKey();
MessageKeys messageKeys = chainKey.getMessageKeys();
ECPublicKey senderEphemeral = sessionState.getSenderRatchetKey();
uint previousCounter = sessionState.getPreviousCounter();
uint sessionVersion = sessionState.getSessionVersion();
byte[] ciphertextBody = getCiphertext(messageKeys, paddedMessage);
CiphertextMessage ciphertextMessage = new SignalMessage(sessionVersion, messageKeys.getMacKey(),
senderEphemeral, chainKey.getIndex(),
previousCounter, ciphertextBody,
sessionState.getLocalIdentityKey(),
sessionState.getRemoteIdentityKey());
if (sessionState.hasUnacknowledgedPreKeyMessage())
{
SessionState.UnacknowledgedPreKeyMessageItems items = sessionState.getUnacknowledgedPreKeyMessageItems();
uint localRegistrationId = sessionState.GetLocalRegistrationId();
ciphertextMessage = new PreKeySignalMessage(sessionVersion, localRegistrationId, items.getPreKeyId(),
items.getSignedPreKeyId(), items.getBaseKey(),
sessionState.getLocalIdentityKey(),
(SignalMessage)ciphertextMessage);
}
sessionState.setSenderChainKey(chainKey.getNextChainKey());
if (!identityKeyStore.IsTrustedIdentity(remoteAddress, sessionState.getRemoteIdentityKey(), Direction.SENDING))
{
throw new UntrustedIdentityException(remoteAddress.Name, sessionState.getRemoteIdentityKey());
}
identityKeyStore.SaveIdentity(remoteAddress, sessionState.getRemoteIdentityKey());
sessionStore.StoreSession(remoteAddress, sessionRecord);
return(ciphertextMessage);
}
}