The padding strategy the sender uses can change without needing to
update the receiver, so long as we continue to record the unpadded
length of the attachment in the attachment pointer.
// FREEBIE
Crypto Scheme:
- Name (un)padding
- WIP AES-GCM (funtioning, but need to verify against android
implementation, and tag functionality)
Changes to avatar API:
- hard code avatar domain (cdn.signal.org)
- avatar form hands out new avatar key, invalidating old avatar
- preliminary aes-gcm integration
Also:
- New type to represent AES128 keys, rather than passing around opaque
data blobs everywhere, we can use the compiler to help us make sure
we're passing compliant keying material.
- Started using factory pattern for API requests. This is intended to be
a lighter weight way to implement new API requests, rather than the
current 1-method class ceremony.
// FREEBIE
