public void testNoSession()
{
InMemorySenderKeyStore aliceStore = new InMemorySenderKeyStore();
InMemorySenderKeyStore bobStore = new InMemorySenderKeyStore();
GroupSessionBuilder aliceSessionBuilder = new GroupSessionBuilder(aliceStore);
GroupSessionBuilder bobSessionBuilder = new GroupSessionBuilder(bobStore);
GroupCipher aliceGroupCipher = new GroupCipher(aliceStore, GROUP_SENDER);
GroupCipher bobGroupCipher = new GroupCipher(bobStore, GROUP_SENDER);
SenderKeyDistributionMessage sentAliceDistributionMessage = aliceSessionBuilder.create(GROUP_SENDER);
SenderKeyDistributionMessage receivedAliceDistributionMessage = new SenderKeyDistributionMessage(sentAliceDistributionMessage.serialize());
// bobSessionBuilder.process(GROUP_SENDER, receivedAliceDistributionMessage);
byte[] ciphertextFromAlice = aliceGroupCipher.encrypt(Encoding.UTF8.GetBytes("smert ze smert"));
try
{
byte[] plaintextFromAlice = bobGroupCipher.decrypt(ciphertextFromAlice);
throw new Exception("Should be no session!");
}
catch (NoSessionException e)
{
// good
}
}
/**
* 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 void testBasicEncryptDecrypt()
{
InMemorySenderKeyStore aliceStore = new InMemorySenderKeyStore();
InMemorySenderKeyStore bobStore = new InMemorySenderKeyStore();
GroupSessionBuilder aliceSessionBuilder = new GroupSessionBuilder(aliceStore);
GroupSessionBuilder bobSessionBuilder = new GroupSessionBuilder(bobStore);
GroupCipher aliceGroupCipher = new GroupCipher(aliceStore, GROUP_SENDER);
GroupCipher bobGroupCipher = new GroupCipher(bobStore, GROUP_SENDER);
SenderKeyDistributionMessage sentAliceDistributionMessage = aliceSessionBuilder.create(GROUP_SENDER);
SenderKeyDistributionMessage receivedAliceDistributionMessage = new SenderKeyDistributionMessage(sentAliceDistributionMessage.serialize());
bobSessionBuilder.process(GROUP_SENDER, receivedAliceDistributionMessage);
byte[] ciphertextFromAlice = aliceGroupCipher.encrypt(Encoding.UTF8.GetBytes("smert ze smert"));
byte[] plaintextFromAlice = bobGroupCipher.decrypt(ciphertextFromAlice);
Assert.AreEqual("smert ze smert", Encoding.UTF8.GetString(plaintextFromAlice));
}
public void testLargeMessages()
{
InMemorySenderKeyStore aliceStore = new InMemorySenderKeyStore();
InMemorySenderKeyStore bobStore = new InMemorySenderKeyStore();
GroupSessionBuilder aliceSessionBuilder = new GroupSessionBuilder(aliceStore);
GroupSessionBuilder bobSessionBuilder = new GroupSessionBuilder(bobStore);
GroupCipher aliceGroupCipher = new GroupCipher(aliceStore, GROUP_SENDER);
GroupCipher bobGroupCipher = new GroupCipher(bobStore, GROUP_SENDER);
SenderKeyDistributionMessage sentAliceDistributionMessage = aliceSessionBuilder.create(GROUP_SENDER);
SenderKeyDistributionMessage receivedAliceDistributionMessage = new SenderKeyDistributionMessage(sentAliceDistributionMessage.serialize());
bobSessionBuilder.process(GROUP_SENDER, receivedAliceDistributionMessage);
byte[] plaintext = new byte[1024 * 1024];
new Random().NextBytes(plaintext);
byte[] ciphertextFromAlice = aliceGroupCipher.encrypt(plaintext);
byte[] plaintextFromAlice = bobGroupCipher.decrypt(ciphertextFromAlice);
CollectionAssert.AreEqual(plaintext, plaintextFromAlice);
}
public void testBasicRatchet()
{
InMemorySenderKeyStore aliceStore = new InMemorySenderKeyStore();
InMemorySenderKeyStore bobStore = new InMemorySenderKeyStore();
GroupSessionBuilder aliceSessionBuilder = new GroupSessionBuilder(aliceStore);
GroupSessionBuilder bobSessionBuilder = new GroupSessionBuilder(bobStore);
SenderKeyName aliceName = GROUP_SENDER;
GroupCipher aliceGroupCipher = new GroupCipher(aliceStore, aliceName);
GroupCipher bobGroupCipher = new GroupCipher(bobStore, aliceName);
SenderKeyDistributionMessage sentAliceDistributionMessage =
aliceSessionBuilder.create(aliceName);
SenderKeyDistributionMessage receivedAliceDistributionMessage =
new SenderKeyDistributionMessage(sentAliceDistributionMessage.serialize());
bobSessionBuilder.process(aliceName, receivedAliceDistributionMessage);
byte[] ciphertextFromAlice = aliceGroupCipher.encrypt(Encoding.UTF8.GetBytes("smert ze smert"));
byte[] ciphertextFromAlice2 = aliceGroupCipher.encrypt(Encoding.UTF8.GetBytes("smert ze smert2"));
byte[] ciphertextFromAlice3 = aliceGroupCipher.encrypt(Encoding.UTF8.GetBytes("smert ze smert3"));
byte[] plaintextFromAlice = bobGroupCipher.decrypt(ciphertextFromAlice);
try
{
bobGroupCipher.decrypt(ciphertextFromAlice);
throw new Exception("Should have ratcheted forward!");
}
catch (DuplicateMessageException dme)
{
// good
}
byte[] plaintextFromAlice2 = bobGroupCipher.decrypt(ciphertextFromAlice2);
byte[] plaintextFromAlice3 = bobGroupCipher.decrypt(ciphertextFromAlice3);
Assert.AreEqual("smert ze smert", Encoding.UTF8.GetString(plaintextFromAlice));
Assert.AreEqual("smert ze smert2", Encoding.UTF8.GetString(plaintextFromAlice2));
Assert.AreEqual("smert ze smert3", Encoding.UTF8.GetString(plaintextFromAlice3));
}
