def handleSenderKeyMessage(self, node):
encMessageProtocolEntity = EncryptedMessageProtocolEntity(node)
enc_ = encMessageProtocolEntity.getEnc(EncProtocolEntity.TYPE_SKMSG)
senderKeyName = SenderKeyName(
encMessageProtocolEntity.sender,
AxolotlAddress(
Jid.denormalize(encMessageProtocolEntity.participant), 0))
groupCipher = GroupCipher(self.store, senderKeyName)
try:
plaintext = groupCipher.decrypt(enc_.getData())
paddingByte = plaintext[-1] if type(plaintext[-1]) is int else ord(
plaintext[-1])
padding = paddingByte & 0xFF
self.parseAndHandleMessageProto(encMessageProtocolEntity,
plaintext[:-padding])
except NoSessionException:
logger.warning(
"No session for %s, going to send a retry",
Jid.denormalize(encMessageProtocolEntity.getAuthor()))
retry = RetryOutgoingReceiptProtocolEntity.fromMessageNode(
node, self.store.getLocalRegistrationId())
self.toLower(retry.toProtocolTreeNode())
except Exception as ex: # (AttributeError, TypeError)
logger.error('Exception in handleSenderKeyMessage: %s' % ex)
raise
def handleSenderKeyMessage(self, node):
encMessageProtocolEntity = EncryptedMessageProtocolEntity.fromProtocolTreeNode(
node)
enc = encMessageProtocolEntity.getEnc(EncProtocolEntity.TYPE_SKMSG)
senderKeyName = SenderKeyName(
encMessageProtocolEntity.getFrom(True),
AxolotlAddress(encMessageProtocolEntity.getParticipant(False), 0))
groupCipher = GroupCipher(self.store, senderKeyName)
try:
plaintext = groupCipher.decrypt(enc.getData())
#print("Plain before:", plaintext)
padding = ord(plaintext[-1]) & 0xFF
plaintext = plaintext[:-padding]
plaintext = plaintext.encode() if sys.version_info >= (
3, 0) else plaintext
#print("Plain:", plaintext)
self.parseAndHandleMessageProto(encMessageProtocolEntity,
plaintext)
except NoSessionException as e:
logger.warning("No session for %s, going to send a retry",
encMessageProtocolEntity.getAuthor(False))
retry = RetryOutgoingReceiptProtocolEntity.fromMessageNode(
node, self.store.getLocalRegistrationId())
self.toLower(retry.toProtocolTreeNode())
def test_basicRatchet(self):
aliceStore = InMemorySenderKeyStore();
bobStore = InMemorySenderKeyStore();
aliceSessionBuilder = GroupSessionBuilder(aliceStore)
bobSessionBuilder = GroupSessionBuilder(bobStore)
aliceGroupCipher = GroupCipher(aliceStore, GROUP_SENDER)
bobGroupCipher = GroupCipher(bobStore, GROUP_SENDER);
sentAliceDistributionMessage = aliceSessionBuilder.create(GROUP_SENDER);
receivedAliceDistributionMessage = SenderKeyDistributionMessage(serialized = sentAliceDistributionMessage.serialize());
bobSessionBuilder.process(GROUP_SENDER, receivedAliceDistributionMessage)
ciphertextFromAlice = aliceGroupCipher.encrypt("smert ze smert")
ciphertextFromAlice2 = aliceGroupCipher.encrypt("smert ze smert2")
ciphertextFromAlice3 = aliceGroupCipher.encrypt("smert ze smert3")
plaintextFromAlice = bobGroupCipher.decrypt(ciphertextFromAlice)
try:
bobGroupCipher.decrypt(ciphertextFromAlice)
raise AssertionError("Should have ratcheted forward!")
except DuplicateMessageException as dme:
# good
pass
plaintextFromAlice2 = bobGroupCipher.decrypt(ciphertextFromAlice2)
plaintextFromAlice3 = bobGroupCipher.decrypt(ciphertextFromAlice3)
self.assertEqual(plaintextFromAlice,"smert ze smert")
self.assertEqual(plaintextFromAlice2, "smert ze smert2")
self.assertEqual(plaintextFromAlice3, "smert ze smert3")
def handleSenderKeyMessage(self, node):
encMessageProtocolEntity = EncryptedMessageProtocolEntity.fromProtocolTreeNode(node)
enc = encMessageProtocolEntity.getEnc(EncProtocolEntity.TYPE_SKMSG)
senderKeyName = SenderKeyName(encMessageProtocolEntity.getFrom(True), AxolotlAddress(encMessageProtocolEntity.getParticipant(False), 0))
groupCipher = GroupCipher(self.store, senderKeyName)
try:
plaintext = groupCipher.decrypt(enc.getData())
padding = ord(plaintext[-1]) & 0xFF
self.parseAndHandleMessageProto(encMessageProtocolEntity, plaintext[:-padding])
except NoSessionException as e:
logger.error(e)
retry = RetryOutgoingReceiptProtocolEntity.fromMessageNode(node)
retry.setRegData(self.store.getLocalRegistrationId())
self.toLower(retry.toProtocolTreeNode())
def handleSenderKeyMessage(self, node):
encMessageProtocolEntity = EncryptedMessageProtocolEntity.fromProtocolTreeNode(node)
enc = encMessageProtocolEntity.getEnc(EncProtocolEntity.TYPE_SKMSG)
senderKeyName = SenderKeyName(encMessageProtocolEntity.getFrom(True), AxolotlAddress(encMessageProtocolEntity.getParticipant(False), 0))
groupCipher = GroupCipher(self.store, senderKeyName)
try:
plaintext = groupCipher.decrypt(enc.getData())
padding = ord(plaintext[-1]) & 0xFF
self.parseAndHandleMessageProto(encMessageProtocolEntity, plaintext[:-padding])
except NoSessionException as e:
logger.error(e)
retry = RetryOutgoingReceiptProtocolEntity.fromMessageNode(node)
retry.setRegData(self.store.getLocalRegistrationId())
self.toLower(retry.toProtocolTreeNode())
def getGroupCipher(self, groupId, senderId):
senderKeyName = SenderKeyName(groupId, AxolotlAddress(senderId, 0))
if senderKeyName in self.groupCiphers:
groupCipher = self.groupCiphers[senderKeyName]
else:
groupCipher = GroupCipher(self.store, senderKeyName)
self.groupCiphers[senderKeyName] = groupCipher
return groupCipher
def handleSenderKeyMessage(self, node):
encMessageProtocolEntity = EncryptedMessageProtocolEntity.fromProtocolTreeNode(node)
enc = encMessageProtocolEntity.getEnc(EncProtocolEntity.TYPE_SKMSG)
senderKeyName = SenderKeyName(encMessageProtocolEntity.getFrom(True), AxolotlAddress(encMessageProtocolEntity.getParticipant(False), 0))
groupCipher = GroupCipher(self.store, senderKeyName)
try:
plaintext = groupCipher.decrypt(enc.getData())
padding = ord(plaintext[-1]) & 0xFF
plaintext = plaintext[:-padding]
plaintext = plaintext.encode() if sys.version_info >= (3, 0) else plaintext
self.parseAndHandleMessageProto(encMessageProtocolEntity, plaintext)
except NoSessionException as e:
logger.warning("No session for %s, going to send a retry", encMessageProtocolEntity.getAuthor(False))
retry = RetryOutgoingReceiptProtocolEntity.fromMessageNode(node, self.store.getLocalRegistrationId())
self.toLower(retry.toProtocolTreeNode())
def handleSenderKeyMessage(self, node):
encMessageProtocolEntity = EncryptedMessageProtocolEntity.fromProtocolTreeNode(
node)
enc = encMessageProtocolEntity.getEnc(EncProtocolEntity.TYPE_SKMSG)
senderKeyName = SenderKeyName(
encMessageProtocolEntity.getFrom(True),
AxolotlAddress(encMessageProtocolEntity.getParticipant(False), 0))
groupCipher = GroupCipher(self.store, senderKeyName)
try:
plaintext = groupCipher.decrypt(enc.getData())
if type(plaintext) == bytes:
# DEBUG SET RECEIPT
# self.toLower(OutgoingReceiptProtocolEntity(node["id"], node["from"], 'read', participant=node["participant"]).toProtocolTreeNode())
if plaintext[0:1] == b'\n':
msg = plaintext[3:3 + plaintext[1:2][-1]]
elif plaintext[2:3] == b'\x01':
msg = plaintext[5:5 + plaintext[4:5][-1]]
if msg[0:1] == b'\x01':
msg = plaintext[6:6 + plaintext[4:5][-1]]
else:
msg = plaintext[4:4 + plaintext[3:4][-1]]
# self.parseAndHandleMessageProto(encMessageProtocolEntity, plaintext)
self.handleConversationMessage(node, msg.decode())
# self.parseAndHandleMessageProto(encMessageProtocolEntity, plaintext.split(b'\x8a')[0])
return
try:
padding = ord(plaintext[-1]) & 0xFF
plaintext = plaintext[:-padding]
plaintext = plaintext.encode() if sys.version_info >= (
3, 0) else plaintext
self.parseAndHandleMessageProto(encMessageProtocolEntity,
plaintext)
except Exception as ex: #(AttributeError, TypeError)
logger.error('Exception')
logger.error('Exception %s' % ex)
except NoSessionException as e:
logger.warning("No session for %s, going to send a retry",
encMessageProtocolEntity.getAuthor(False))
retry = RetryOutgoingReceiptProtocolEntity.fromMessageNode(
node, self.store.getLocalRegistrationId())
self.toLower(retry.toProtocolTreeNode())
def _get_group_cipher(self, groupid, username):
logger.debug("get_group_cipher(groupid=%s, username=%s)" % (groupid, username))
senderkeyname = SenderKeyName(groupid, AxolotlAddress(username, 0))
if senderkeyname in self._group_ciphers:
group_cipher = self._group_ciphers[senderkeyname]
else:
group_cipher = GroupCipher(self._store.senderKeyStore, senderkeyname)
self._group_ciphers[senderkeyname] = group_cipher
return group_cipher
def test_basicEncryptDecrypt(self):
aliceStore = InMemorySenderKeyStore();
bobStore = InMemorySenderKeyStore();
aliceSessionBuilder = GroupSessionBuilder(aliceStore)
bobSessionBuilder = GroupSessionBuilder(bobStore)
aliceGroupCipher = GroupCipher(aliceStore, GROUP_SENDER)
bobGroupCipher = GroupCipher(bobStore, GROUP_SENDER);
sentAliceDistributionMessage = aliceSessionBuilder.create(GROUP_SENDER);
receivedAliceDistributionMessage = SenderKeyDistributionMessage(serialized = sentAliceDistributionMessage.serialize());
bobSessionBuilder.process(GROUP_SENDER, receivedAliceDistributionMessage)
ciphertextFromAlice = aliceGroupCipher.encrypt("smert ze smert")
plaintextFromAlice = bobGroupCipher.decrypt(ciphertextFromAlice)
self.assertEqual(plaintextFromAlice, "smert ze smert")
def test_noSession(self):
aliceStore = InMemorySenderKeyStore();
bobStore = InMemorySenderKeyStore();
aliceSessionBuilder = GroupSessionBuilder(aliceStore)
bobSessionBuilder = GroupSessionBuilder(bobStore)
aliceGroupCipher = GroupCipher(aliceStore, GROUP_SENDER)
bobGroupCipher = GroupCipher(bobStore, GROUP_SENDER);
sentAliceDistributionMessage = aliceSessionBuilder.create(GROUP_SENDER);
receivedAliceDistributionMessage = SenderKeyDistributionMessage(serialized = sentAliceDistributionMessage.serialize());
ciphertextFromAlice = aliceGroupCipher.encrypt("smert ze smert");
try:
plaintextFromAlice = bobGroupCipher.decrypt(ciphertextFromAlice);
raise AssertionError("Should be no session!");
except NoSessionException as e:
pass
def test_outOfOrder(self):
aliceStore = InMemorySenderKeyStore();
bobStore = InMemorySenderKeyStore();
aliceSessionBuilder = GroupSessionBuilder(aliceStore)
bobSessionBuilder = GroupSessionBuilder(bobStore)
aliceGroupCipher = GroupCipher(aliceStore, GROUP_SENDER)
bobGroupCipher = GroupCipher(bobStore, GROUP_SENDER);
sentAliceDistributionMessage = aliceSessionBuilder.create(GROUP_SENDER);
receivedAliceDistributionMessage = SenderKeyDistributionMessage(serialized = sentAliceDistributionMessage.serialize());
bobSessionBuilder.process(GROUP_SENDER, receivedAliceDistributionMessage)
ciphertexts = []
for i in range(0, 100):
ciphertexts.append(aliceGroupCipher.encrypt("up the punks"))
while len(ciphertexts) > 0:
index = KeyHelper.getRandomSequence(2147483647) % len(ciphertexts)
ciphertext = ciphertexts.pop(index)
plaintext = bobGroupCipher.decrypt(ciphertext)
self.assertEqual(plaintext, "up the punks")