/**
* Construct a group session for sending messages.
*
* @param senderKeyName The (groupId, senderId, deviceId) tuple. In this case, 'senderId' should be the caller.
* @return A SenderKeyDistributionMessage that is individually distributed to each member of the group.
*/
public SenderKeyDistributionMessage create(SenderKeyName senderKeyName)
{
lock (GroupCipher.LOCK)
{
try
{
SenderKeyRecord senderKeyRecord = senderKeyStore.loadSenderKey(senderKeyName);
if (senderKeyRecord.isEmpty())
{
senderKeyRecord.setSenderKeyState(KeyHelper.generateSenderKeyId(),
0,
KeyHelper.generateSenderKey(),
KeyHelper.generateSenderSigningKey());
senderKeyStore.storeSenderKey(senderKeyName, senderKeyRecord);
}
SenderKeyState state = senderKeyRecord.getSenderKeyState();
return(new SenderKeyDistributionMessage(state.getKeyId(),
state.getSenderChainKey().getIteration(),
state.getSenderChainKey().getSeed(),
state.getSigningKeyPublic()));
}
catch (InvalidKeyIdException e)
{
throw new Exception(e.Message);
}
catch (InvalidKeyException e)
{
throw new Exception(e.Message);
}
}
}
/**
* Construct a group session for sending messages.
*
* @param senderKeyName The (groupId, senderId, deviceId) tuple. In this case, 'senderId' should be the caller.
* @return A SenderKeyDistributionMessage that is individually distributed to each member of the group.
*/
public SenderKeyDistributionMessage create(SenderKeyName senderKeyName)
{
lock (GroupCipher.LOCK)
{
try
{
SenderKeyRecord senderKeyRecord = senderKeyStore.loadSenderKey(senderKeyName);
if (senderKeyRecord.isEmpty())
{
senderKeyRecord.setSenderKeyState(KeyHelper.generateSenderKeyId(),
0,
KeyHelper.generateSenderKey(),
KeyHelper.generateSenderSigningKey());
senderKeyStore.storeSenderKey(senderKeyName, senderKeyRecord);
}
SenderKeyState state = senderKeyRecord.getSenderKeyState();
return new SenderKeyDistributionMessage(state.getKeyId(),
state.getSenderChainKey().getIteration(),
state.getSenderChainKey().getSeed(),
state.getSigningKeyPublic());
}
catch (InvalidKeyIdException e)
{
throw new Exception(e.Message);
}
catch (InvalidKeyException e)
{
throw new Exception(e.Message);
}
}
}
/**
* Construct a group session for receiving messages from senderKeyName.
*
* @param senderKeyName The (groupId, senderId, deviceId) tuple associated with the SenderKeyDistributionMessage.
* @param senderKeyDistributionMessage A received SenderKeyDistributionMessage.
*/
public void process(SenderKeyName senderKeyName, SenderKeyDistributionMessage senderKeyDistributionMessage)
{
lock (GroupCipher.LOCK)
{
SenderKeyRecord senderKeyRecord = senderKeyStore.loadSenderKey(senderKeyName);
senderKeyRecord.addSenderKeyState(senderKeyDistributionMessage.getId(),
senderKeyDistributionMessage.getIteration(),
senderKeyDistributionMessage.getChainKey(),
senderKeyDistributionMessage.getSignatureKey());
senderKeyStore.storeSenderKey(senderKeyName, senderKeyRecord);
}
}
/**
* Construct a group session for receiving messages from senderKeyName.
*
* @param senderKeyName The (groupId, senderId, deviceId) tuple associated with the SenderKeyDistributionMessage.
* @param senderKeyDistributionMessage A received SenderKeyDistributionMessage.
*/
public void process(SenderKeyName senderKeyName, SenderKeyDistributionMessage senderKeyDistributionMessage)
{
lock (GroupCipher.LOCK)
{
SenderKeyRecord senderKeyRecord = senderKeyStore.loadSenderKey(senderKeyName);
senderKeyRecord.addSenderKeyState(senderKeyDistributionMessage.getId(),
senderKeyDistributionMessage.getIteration(),
senderKeyDistributionMessage.getChainKey(),
senderKeyDistributionMessage.getSignatureKey());
senderKeyStore.storeSenderKey(senderKeyName, senderKeyRecord);
}
}
public override bool Equals(Object other)
{
if (other == null)
{
return(false);
}
if (!(other is SenderKeyName))
{
return(false);
}
SenderKeyName that = (SenderKeyName)other;
return
(this.groupId.Equals(that.groupId) &&
this.sender.Equals(that.sender));
}
public SenderKeyRecord loadSenderKey(SenderKeyName senderKeyName)
{
try
{
SenderKeyRecord record;
store.TryGetValue(senderKeyName, out record);
if (record == null)
{
return new SenderKeyRecord();
}
else
{
return new SenderKeyRecord(record.serialize());
}
}
catch (IOException e)
{
throw new Exception(e.Message);
}
}
public GroupCipher(SenderKeyStore senderKeyStore, SenderKeyName senderKeyId)
{
this.senderKeyStore = senderKeyStore;
this.senderKeyId = senderKeyId;
}
public void storeSenderKey(SenderKeyName senderKeyName, SenderKeyRecord record)
{
store[senderKeyName] = record;
}
public GroupCipher(SenderKeyStore senderKeyStore, SenderKeyName senderKeyId)
{
this.senderKeyStore = senderKeyStore;
this.senderKeyId = senderKeyId;
}