ssb-private2

Introduces evelope encryption to scuttlebutt.

STATUS: WIP

Example Usage

const SecretStack = require('secret-stack')
const config = require('ssb-config')
const shs = // from ssb-caps for main network, or your alt-net key

const SSB = SecretStack({ caps: { shs } })
  .use(require('ssb-db'))         // << required
  .use(require('ssb-private2'))

const ssb = SSB(config)

const content = {
  type: 'profile/person',
  //....
  recps: {
    <GroupId>,
    <FeedId>
  }
}
ssb.publish(content, (err, data) => {
})

Later, any of the following will result in a happiliy readable message (for you and those who share the GroupKey):

• you use server.get(msgKey, { private: true }, cb)
• you run any db query which might have matched that message

NOTE:

• <GroupId> is a unique identifier which can be mapped to the <GroupKey> for that Group. The importance of these being distinct is that a <GroupId> is designed to leak no information about who is in the group, and is therefore safe to reference in public contexts.
• <FeedId> is synonymous with the public key of a particular device (@...sha256). Said another way, the id of a feed is currently synonymous with it's (public) key.

Requirements

A Secret-Stack server running the plugins ssb-db and ssb-private2

API

ssb.private2.group.add(groupId, info, cb)

where

• groupId String - is a cloaked group id (see private-group-spec/group-id/README.md)
• info Object - contains data of form { key, scheme } where:
  • key String - a 32 byte symmetric key for the group (as a base64 encoded string)
  • scheme String (optional) - a description of the key management scheme this key is part of
• cb[ Function - a callback with signature cb(err: Error, success: Boolean)

ssb.private2.group.addAuthors(groupId, [authorId], cb)

where callback cb has signature cb(err, success)

ssb.private2.author.keys(authorId, cb)

Get all the keys that a message published by authorId could have used to encrypt with. cb has signature cb(err, keys) where keys is an Array of Buffers.

This is used for suppliying trial_keys to envelope-js's unbox method.

---

ssb.private2.group.removeAuthors(groupId, [authorId], cb)

⚠️ NOT YET IMPLEMENTED

Where cb has signature cb(err: Error, success: Boolean)

ssb.private2.group.create(name, cb)

⚠️ NOT YET IMPLEMENTED

Mint a new private group. This generates a new key for the group, and a new groupId.

This method calls group.add and group.addAuthors for you (adding you)

ssb.private2.group.remove(groupId, cb)

⚠️ NOT YET IMPLEMENTED

ssb.private2.author.invite(groupId, [authorId], cb)

⚠️ NOT YET IMPLEMENTED

This published entrust messages to the new messages, sending them a copy of the groupKey.

This method calls members.add for you.

Questions

• how does this "key store" interact with flume views?
  • if we discover a new key entrust part way through indexing ... we have to trigger re-indexing of other views
    • might need to reset this view too, as opening existing groups will reveal other entrusts sent to members ....
      • oh god this could get recurrsive. As in ok I know Ben has given me a key so I re-index with and try this key on Ben's encrypted messages, but then I reveal from here that Ben has entrusted the key to Cherese .. ok add Cherese as a member, start again because Cherese may have said something before....
      • I think this means when we entrust we need to know the root message + author.
  • should the key-store sit outside flume views?
    • if it does then we can manually add things from outside system...