public PreKeyWhisperMessage(uint messageVersion, uint registrationId, May<uint> preKeyId,
uint signedPreKeyId, ECPublicKey baseKey, IdentityKey identityKey,
WhisperMessage message)
{
this.version = messageVersion;
this.registrationId = registrationId;
this.preKeyId = preKeyId;
this.signedPreKeyId = signedPreKeyId;
this.baseKey = baseKey;
this.identityKey = identityKey;
this.message = message;
WhisperProtos.PreKeyWhisperMessage.Builder builder =
WhisperProtos.PreKeyWhisperMessage.CreateBuilder()
.SetSignedPreKeyId(signedPreKeyId)
.SetBaseKey(ByteString.CopyFrom(baseKey.serialize()))
.SetIdentityKey(ByteString.CopyFrom(identityKey.serialize()))
.SetMessage(ByteString.CopyFrom(message.serialize()))
.SetRegistrationId(registrationId);
if (preKeyId.HasValue) // .isPresent()
{
builder.SetPreKeyId(preKeyId.ForceGetValue()); // get()
}
byte[] versionBytes = { ByteUtil.intsToByteHighAndLow((int)this.version, (int)CURRENT_VERSION) };
byte[] messageBytes = builder.Build().ToByteArray();
this.serialized = ByteUtil.combine(versionBytes, messageBytes);
}
public PreKeyWhisperMessage(uint messageVersion, uint registrationId, May <uint> preKeyId,
uint signedPreKeyId, ECPublicKey baseKey, IdentityKey identityKey,
WhisperMessage message)
{
this.version = messageVersion;
this.registrationId = registrationId;
this.preKeyId = preKeyId;
this.signedPreKeyId = signedPreKeyId;
this.baseKey = baseKey;
this.identityKey = identityKey;
this.message = message;
WhisperProtos.PreKeyWhisperMessage.Builder builder =
WhisperProtos.PreKeyWhisperMessage.CreateBuilder()
.SetSignedPreKeyId(signedPreKeyId)
.SetBaseKey(ByteString.CopyFrom(baseKey.serialize()))
.SetIdentityKey(ByteString.CopyFrom(identityKey.serialize()))
.SetMessage(ByteString.CopyFrom(message.serialize()))
.SetRegistrationId(registrationId);
if (preKeyId.HasValue) // .isPresent()
{
builder.SetPreKeyId(preKeyId.ForceGetValue()); // get()
}
byte[] versionBytes = { ByteUtil.intsToByteHighAndLow((int)this.version, (int)CURRENT_VERSION) };
byte[] messageBytes = builder.Build().ToByteArray();
this.serialized = ByteUtil.combine(versionBytes, messageBytes);
}
public PreKeyWhisperMessage(byte[] serialized)
{
try
{
this.version = (uint)ByteUtil.highBitsToInt(serialized[0]);
if (this.version > CiphertextMessage.CURRENT_VERSION)
{
throw new InvalidVersionException("Unknown version: " + this.version);
}
WhisperProtos.PreKeyWhisperMessage preKeyWhisperMessage
= WhisperProtos.PreKeyWhisperMessage.ParseFrom(ByteString.CopyFrom(serialized, 1,
serialized.Length - 1));
if ((version == 2 && !preKeyWhisperMessage.HasPreKeyId) ||
(version == 3 && !preKeyWhisperMessage.HasSignedPreKeyId) ||
!preKeyWhisperMessage.HasBaseKey ||
!preKeyWhisperMessage.HasIdentityKey ||
!preKeyWhisperMessage.HasMessage)
{
throw new InvalidMessageException("Incomplete message.");
}
this.serialized = serialized;
this.registrationId = preKeyWhisperMessage.RegistrationId;
this.preKeyId = preKeyWhisperMessage.HasPreKeyId ? new May<uint>(preKeyWhisperMessage.PreKeyId) : May<uint>.NoValue;
this.signedPreKeyId = preKeyWhisperMessage.HasSignedPreKeyId ? preKeyWhisperMessage.SignedPreKeyId : uint.MaxValue; // -1
this.baseKey = Curve.decodePoint(preKeyWhisperMessage.BaseKey.ToByteArray(), 0);
this.identityKey = new IdentityKey(Curve.decodePoint(preKeyWhisperMessage.IdentityKey.ToByteArray(), 0));
this.message = new WhisperMessage(preKeyWhisperMessage.Message.ToByteArray());
}
catch (Exception e)
{
//(InvalidProtocolBufferException | InvalidKeyException | LegacyMessage
throw new InvalidMessageException(e.Message);
}
}
public PreKeyWhisperMessage(byte[] serialized)
{
try
{
this.version = (uint)ByteUtil.highBitsToInt(serialized[0]);
if (this.version > CiphertextMessage.CURRENT_VERSION)
{
throw new InvalidVersionException("Unknown version: " + this.version);
}
WhisperProtos.PreKeyWhisperMessage preKeyWhisperMessage
= WhisperProtos.PreKeyWhisperMessage.ParseFrom(ByteString.CopyFrom(serialized, 1,
serialized.Length - 1));
if ((version == 2 && !preKeyWhisperMessage.HasPreKeyId) ||
(version == 3 && !preKeyWhisperMessage.HasSignedPreKeyId) ||
!preKeyWhisperMessage.HasBaseKey ||
!preKeyWhisperMessage.HasIdentityKey ||
!preKeyWhisperMessage.HasMessage)
{
throw new InvalidMessageException("Incomplete message.");
}
this.serialized = serialized;
this.registrationId = preKeyWhisperMessage.RegistrationId;
this.preKeyId = preKeyWhisperMessage.HasPreKeyId ? new May <uint>(preKeyWhisperMessage.PreKeyId) : May <uint> .NoValue;
this.signedPreKeyId = preKeyWhisperMessage.HasSignedPreKeyId ? preKeyWhisperMessage.SignedPreKeyId : uint.MaxValue; // -1
this.baseKey = Curve.decodePoint(preKeyWhisperMessage.BaseKey.ToByteArray(), 0);
this.identityKey = new IdentityKey(Curve.decodePoint(preKeyWhisperMessage.IdentityKey.ToByteArray(), 0));
this.message = new WhisperMessage(preKeyWhisperMessage.Message.ToByteArray());
}
catch (Exception e)
{
//(InvalidProtocolBufferException | InvalidKeyException | LegacyMessage
throw new InvalidMessageException(e.Message);
}
}
/**
* 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;
}
}
private byte[] decrypt(SessionState sessionState, WhisperMessage ciphertextMessage)
{
if (!sessionState.hasSenderChain())
{
throw new InvalidMessageException("Uninitialized session!");
}
if (ciphertextMessage.getMessageVersion() != sessionState.getSessionVersion())
{
throw new InvalidMessageException($"Message version {ciphertextMessage.getMessageVersion()}, but session version {sessionState.getSessionVersion()}");
}
uint messageVersion = ciphertextMessage.getMessageVersion();
ECPublicKey theirEphemeral = ciphertextMessage.getSenderRatchetKey();
uint counter = ciphertextMessage.getCounter();
ChainKey chainKey = getOrCreateChainKey(sessionState, theirEphemeral);
MessageKeys messageKeys = getOrCreateMessageKeys(sessionState, theirEphemeral,
chainKey, counter);
/* ciphertextMessage.verifyMac(messageVersion,
sessionState.getRemoteIdentityKey(),
sessionState.getLocalIdentityKey(),
messageKeys.getMacKey());*/
byte[] plaintext = getPlaintext(messageVersion, messageKeys, ciphertextMessage.getBody());
sessionState.clearUnacknowledgedPreKeyMessage();
return plaintext;
}
private byte[] decrypt(SessionRecord sessionRecord, WhisperMessage ciphertext)
{
lock (SESSION_LOCK)
{
IEnumerator<SessionState> previousStates = sessionRecord.getPreviousSessionStates().GetEnumerator(); //iterator
LinkedList<Exception> exceptions = new LinkedList<Exception>();
try
{
SessionState sessionState = new SessionState(sessionRecord.getSessionState());
byte[] plaintext = decrypt(sessionState, ciphertext);
sessionRecord.setState(sessionState);
return plaintext;
}
catch (InvalidMessageException e)
{
exceptions.AddLast(e); // add (java default behavioir addlast)
}
while (previousStates.MoveNext()) //hasNext();
{
try
{
SessionState promotedState = new SessionState(previousStates.Current); //.next()
byte[] plaintext = decrypt(promotedState, ciphertext);
sessionRecord.getPreviousSessionStates().Remove(previousStates.Current); // previousStates.remove()
sessionRecord.promoteState(promotedState);
return plaintext;
}
catch (InvalidMessageException e)
{
exceptions.AddLast(e);
}
}
throw new InvalidMessageException("No valid sessions.", exceptions);
}
}
/**
* Decrypt a message.
*
* @param ciphertext The {@link WhisperMessage} to decrypt.
* @param callback A callback that is triggered after decryption is complete,
* but before the updated session state has been committed to the session
* DB. This allows some implementations to store the committed plaintext
* to a DB first, in case they are concerned with a crash happening between
* the time the session state is updated but before they're able to store
* the plaintext to disk.
*
* @return The plaintext.
* @throws InvalidMessageException if the input is not valid ciphertext.
* @throws DuplicateMessageException if the input is a message that has already been received.
* @throws LegacyMessageException if the input is a message formatted by a protocol version that
* is no longer supported.
* @throws NoSessionException if there is no established session for this contact.
*/
public byte[] decrypt(WhisperMessage ciphertext, DecryptionCallback callback)
{
lock (SESSION_LOCK)
{
if (!sessionStore.ContainsSession(remoteAddress))
{
throw new NoSessionException($"No session for: {remoteAddress}");
}
SessionRecord sessionRecord = sessionStore.LoadSession(remoteAddress);
byte[] plaintext = decrypt(sessionRecord, ciphertext);
callback.handlePlaintext(plaintext);
sessionStore.StoreSession(remoteAddress, sessionRecord);
return plaintext;
}
}
/**
* Decrypt a message.
*
* @param ciphertext The {@link WhisperMessage} to decrypt.
*
* @return The plaintext.
* @throws InvalidMessageException if the input is not valid ciphertext.
* @throws DuplicateMessageException if the input is a message that has already been received.
* @throws LegacyMessageException if the input is a message formatted by a protocol version that
* is no longer supported.
* @throws NoSessionException if there is no established session for this contact.
*/
public byte[] decrypt(WhisperMessage ciphertext)
{
return decrypt(ciphertext, new NullDecryptionCallback());
}