libolm - Implementation of the olm and megolm cryptographic ratchets

Age	Commit message (Collapse)	Author
2017-01-06	Enable exporting inbound group session keys	Richard van der Hoff
	A pair of functions which allow you to export the megolm keys for an inbound group session, so that an application can save/restore them.
2016-10-20	Add NULL check for message_index pointer	Mark Haines

2016-10-20	Return the message index when decrypting group messages.	Mark Haines
	Applications can use the index to detect replays of the same message.
2016-09-13	Merge pull request #23 from matrix-org/markjh/remove_message_index	Mark Haines
	Remove the messsage index from olm_init_inbound_group_session
2016-09-13	Remove the messsage index from olm_init_inbound_group_session since it is ↵	Mark Haines
	read from the session_key
2016-09-13	Add a olm_inbound_group_session_id method	Mark Haines

2016-09-13	Comment on the encoding of the message counter.	Mark Haines

2016-09-13	Use the ed22519 public key as the group session id.	Mark Haines
	Some clients expect the session id to be globally unique, so allowing the end devices to pick the session id will cause problems. Include the current ratchet index with the initial keys, this decreases the risk that the client will supply the wrong index causing problems. Sign the initial keys with the ratchet ed25519 key, this reduces the risk of a client claiming a session that they didn't create.
2016-09-06	Sign megolm messages	Richard van der Hoff
	Add ed25519 keys to the inbound and outbound sessions, and use them to sign and verify megolm messages. We just stuff the ed25519 public key in alongside the megolm session key (and add a version byte), to save adding more boilerplate to the JS/python/etc layers.
2016-05-25	Remove session_id from group messages	Richard van der Hoff
	Putting the session_id inside the packed message body makes it hard to extract so that we can decide which session to use. We don't think there is any advantage to having thes sesion_id protected by the HMACs, so we're going to move it to the JSON framing.
2016-05-24	Separate base64ing from the rest of msg encoding	Richard van der Hoff
	Factor the actual message encoding/decoding and encrypting/decrypting out to separate functions from the top-level functions which do the base64-wrangling. This is particularly helpful in the 'outbound' code-path where the offsets required to allow room to base64-encode make the flow hard to see when it's all inline.
2016-05-24	Update megolm_cipher as a global struct	Richard van der Hoff
	Initialise megolm_cipher via the preprocessor macro, instead of with a function.
2016-05-24	Use _olm_unset instead of memset	Richard van der Hoff
	memset is at risk of being optimised away, so use _olm_unset instead.
2016-05-24	Avoid relying on uint -> int casting behaviour	Richard van der Hoff
	The behaviour when casting from a uint32_t which has overflowed (so has the top bit set) to int32_t is implementation-defined, so let's avoid relying on it.
2016-05-24	Fix up some names, and protobuf tags	Richard van der Hoff
	Make names (of session_key and message_index) more consistent. Use our own protobuf tags rather than trying to piggyback on the one-to-one structure.
2016-05-24	Support for pickling inbound group sessions	Richard van der Hoff

2016-05-24	Implement decrypting inbound group messages	Richard van der Hoff
	Includes creation of inbound sessions, etc