43d6305157
This introduces the ability for status notes to handle community history archive magnetlinks. To make this work, a few things are needed: 1. A new database table has been introduced to store message archive hashes. This is necessary so status nodes can determine whether or not they need to download a certain archive 2. The messenger's `handleRetrievedMessages()` has been exteded to take magnetlink messages into account 3. New APIs were added to download torrent data given a magnetlink and also to extract messages from downloaded archives, which are then later fed to `handleRetrievedMessages` Closes #2568
protocol/encryption package
Hash ratchet encryption
encryptor.GenerateHashRatchetKey() generates a hash ratchet key and stores it in in the DB.
There, 2 new tables are created: hash_ratchet_encryption and hash_ratchet_encryption_cache.
Each hash ratchet key is uniquely identified by the (groupId, keyId) pair, where keyId is derived from a clock value.
protocol.BuildHashRatchetKeyExchangeMessage builds an 1-on-1 message containing the hash ratchet key, given it's ID.
protocol.BuildHashRatchetMessage builds a hash ratchet message with arbitrary payload, given groupId. It will use the latest hash ratchet key available. encryptor.encryptWithHR encrypts the payload using Hash Ratchet algorithms. Intermediate hashes are stored in hash_ratchet_encryption_cache table.
protocol.HandleMessage uses encryptor.decryptWithHR fn for decryption.