42dd38cfc400dff40199849ac8735ea0cd3f890f
10 Commits
| Author | SHA1 | Message | Date | |
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Kgothatso Ngako
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b4ac65f5c9 |
feat: sign a nostr event with the group's shared key
A ceremony leaves every member holding a share of a t-of-n key and no way
to use it. This is the other half: a session that turns an unsigned nostr
event into one signed by the group.
The shape is ChillDkgRitualManager's, deliberately. The member who
proposes coordinates, protocol messages travel as gift-wrapped rumors on
the same NIP-17 pipeline chat messages use, each inbound message is
persisted and then the session is asked whether it can move, and every
step is recomputed from stored inputs so a device killed mid-round
resumes on the next message. Anyone who has read that manager can read
this one.
proposer --[ 30320 proposal ]-> everyone the unsigned event
signer --[ 30321 nonce ]-> everyone this device's public nonce
proposer --[ 30322 signer set ]-> everyone who signs, and their aggregated nonce
signer --[ 30323 partial ]-> everyone this device's partial signature
proposer --[ 30324 signature ]-> everyone the finished 64-byte signature
anyone --[ 30325 failure ]-> everyone abandon + blame
Three things are genuinely different, and each is why this is a separate
manager rather than another branch of that one.
**It does not need everybody.** A DKG cannot finish until every member
takes part; that is what makes the key. Signing needs t, and waiting for
n would throw away the property the group ran a ceremony to get. So the
coordinator waits for the threshold to be reachable, picks a set and says
who is in it. Members left out do nothing and stall nothing.
**Restart-safety is forced rather than chosen.** SecretNonce cannot be
serialised and refuses to be used twice, so storing the randomness it
derives from and regenerating on demand is the only way a session
survives the app closing. That is safe for exactly one reason: a session
signs one message and cannot be made to sign another. Two rules hold it
in place and both are load-bearing rather than tidy:
- the event id is written at creation, and a proposal that disagrees
with it is refused rather than applied;
- the aggregated nonce and signer set are write-once. A coordinator
that sends a second, different set is ignored. Obeying it would mean
two partial signatures over one secret nonce against two challenges,
which is precisely how a secret share is extracted. The session
stalls; the share does not.
**One approval, not three.** A DKG asks three times because each step
publishes something different and commits the member to something
different. Here every step serves one decision -- sign this event or do
not -- and the event is fixed before the member is asked, so a second
prompt would be the same question twice. Declining is broadcast rather
than silent: a t-of-n group can sign without you, but only if it knows.
Two things are checked rather than trusted, both because the coordinator
is untrusted by construction: the event id is recomputed from the
proposal's own fields, so a proposer cannot have the group sign one thing
while showing them another; and the finished signature is verified before
the session is called complete, so a bad aggregate is a failure here
rather than a rejection at every relay it reaches.
Signer ids are derived, not stored: a member's FROST id is their index in
the bytewise sort of the ceremony's host keys, the same ordering ChillDKG
hashed into the session identity and the same one the public shares are
in. Deriving means signing cannot disagree with the ceremony that made
the key.
DkgSession gains publicShares, kept because FROST validates each signer's
secret share against its public one. A ceremony finished before this
column reads back null and signing runs without that check rather than
refusing.
The tests run the same calls in the same order against real FROST and
assert the aggregate verifies as a nostr signature. That path was written
from reading the library rather than from a working example, so it is the
part most likely to be subtly wrong -- and wired up wrong it fails
silently, on every device.
Kinds start at 30320 with a gap. The DKG runs 30310-30316 and the
nip30303 document kinds run 30300 up; those two already collide at 30310
and 30311, and SubmissionEvent sits on 30312, which is also the DKG's
round-1 kind. They are kept apart today only by riding different
transports, which is luck. Signing shares a transport and rooms with the
DKG, so it starts clear of both.
No UI yet: this is the session logic, reachable through proposeSigning,
approve and decline.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Kgothatso Ngako
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fcc28de931 |
Revert "fix: hold a payload whose parent has not arrived instead of losing the event"
This reverts commit
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Kgothatso Ngako
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d7aac49cf1 |
fix: hold a payload whose parent has not arrived instead of losing the event
A receiver hit `FOREIGN KEY constraint failed` on an artifact submission and lost the whole group event. The artifact referenced a dialect the receiver did not have, MantraArtifact.dialectId is a foreign key, and SQLite answers a violated constraint by aborting -- which rolled back the entire transaction the inbound pipeline runs in. Gone with it: the NostrEvent, the MarmotGroupEvent, the submission's MarmotInnerEvent holding the payload verbatim, and the transcript line. Nothing retries, so the artifact stayed lost even once the dialect turned up. Every nip30303 entity is a child of another and the schema enforces all of it -- artifact→dialect, version→artifact, chapter→version, chunk→chapter, translations→both of theirs -- so this was every branch, not one. And submissions make arriving before your parent ordinary rather than exotic. That is the point of them: an admin submits a backlog in whatever order they hold it, and a member who joined last week can be sent what the group was told last month. Both produce payloads whose parents are not here yet, and both were losing data. So check the parents before inserting. A payload that arrives early is held on the submission row -- awaitingEventId names what it waits for -- and applied when that arrives. Releasing one can release another, a version freeing its chapters and those freeing their chunks, so it walks outward until nothing more comes unstuck. A payload with a second parent still missing is re-pointed at that one rather than retried on every arrival. Nothing is written to the transcript while a payload is held. Nobody has said anything yet; the line appears when it is applied, in the position its own timestamp gives it. Two things fall out of the shape: parentRefsOf is pure and separate from the lookups, because the mapping is the part that can silently drift from the schema and there is no database harness in commonTest to catch it. ParentRefsTest pins one case per kind. Which table an id lives in is carried as the kind of event that would have created it, so there is no second enum to keep in step. applyInnerEvent takes ids rather than a GroupEvent, since replay happens long after that object is gone. A released payload is recorded as not ours: we hold the parents of anything we wrote, having written those too. Also reconstructs a held bare nip30303 event from its own columns rather than parsing its content as an event -- only submissions carry an event there, and reading both that way would have stranded every bare one permanently. Verified: the v5→v6 migration runs clean on the receiver's real populated database. The hold path itself still needs a fresh submission from a sender to exercise end to end. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> |
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Kgothatso Ngako
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ce77b77240 |
feat: apply the nip30303 event a submission carries, keeping its author
Teach the receiving side to open an envelope before anything starts
sending one. In that order a client that has this can already handle
submissions from a client that does not yet send them; the reverse would
turn every artifact, dialect and chapter into an "unsupported" row for
anyone who had not updated.
Despite the name, MarmotInboundManager does not dispatch on inner-event
kinds -- it decrypts MLS and hands back a GroupEventResult. The kind
dispatch has always lived in ChatMessage.fromGroupEventResult, so that
is where support for a new kind goes.
The `when (event.kind)` body becomes applyInnerEvent, which takes the
event to apply separately from how it arrived:
event the nip30303 event, written by whoever wrote
it -- possibly nobody in this group
marmotInnerEventId the row the group actually delivered
senderPublicKey the member who delivered it
createdAt when they did
For a plain nip30303 event those all come from the one event, which is
exactly the old behaviour. For a submission they come from the envelope
while `event` is the payload. Entity rows take their author from the
payload via fromXEvent, so the chat line says who added something and
the row says who wrote it -- the point of the envelope, made real at the
only place it can be.
createdAt deliberately follows the envelope rather than the payload: a
submitted archive translation can be years old, and sorting the group's
transcript by when the source was written would file "X added a
translation" somewhere nobody will scroll to.
The stored MarmotInnerEvent stays the outer event -- that is what the
group sent -- and gains payloadEventId naming what it carries. The
payload is not given a row of its own: it is recoverable from the
submission's content, and a second row with a null marmotGroupEventId
would look to the outbound pipeline like something waiting to be sent.
Nullable column, so AutoMigration(4, 5) is all it needs; rumors queued
before this read back null, which is correct, since none of them were
submissions.
Two submissions are stored but not applied, because there is nothing in
them to make a row from: one whose payload will not parse, and one
carrying another submission. Both surface as "unsupported" rather than
disappearing.
The unsupported fallback also stops attributing to groupEvent.pubKey,
which is the ephemeral key every kind:445 is signed with and so names
nobody.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Kgothatso Ngako
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cae50ce359 |
feat: hold the ritual until its owner approves each step
The ChillDKG ritual ran entirely on its own. `acceptProposal` published this
device's host key the moment a PROPOSAL arrived from a relay, and `advance`
published rounds 1 and 2 as soon as their inputs landed. Receiving a nostr event
was therefore enough to enrol the owner of a phone in a group's permanent signing
quorum, without anything having been shown to them first.
Nothing of this device's own now goes out before its owner says so. Three
approvals, because each publishes something different and commits the member to
something different:
host key joins the ceremony, and fixes n. A member who joins and then stops
answering does not merely fail to help -- the ritual cannot finish
without every member, so they hold it open for everybody.
round 1 contributes to the key itself. The member's own secret material
starts shaping a key they will be expected to help sign with.
round 2 confirms the coordinator's combined result matches what this device
sent. A check rather than a formality: it is what stops a coordinator
substituting a key the members never contributed to.
The coordinator's two aggregations are deliberately not gated. They relay other
members' already-published messages and disclose nothing of the coordinator's own,
so an approval there would stall the whole group on one person's attention without
protecting anybody. The member who opens a ceremony is auto-approved for the host
key alone -- starting one is already the act of agreeing to be in it -- and is
still asked for rounds 1 and 2, which publish key material.
Each gate returns rather than throwing. The ritual is not failing, it is waiting
on a person; everything already received stays stored, so it resumes the moment
they approve. `pendingApproval` mirrors those gates exactly and has to keep doing
so: if the two disagree the screen offers an approval that does nothing, or none
while the ritual sits still.
Schema v2 -> v3 adds four nullable columns to DkgSession -- three approval
timestamps and `approvalRequestedThrough` -- so Room generates the migration. A
ritual already in flight comes back with all three null, which reads as "not
approved yet" and simply asks, rather than silently continuing.
## Being asked
Three screens rather than one parameterised by step, because each is making a
different case and the copy is the substance of the screen, not decoration around
it. They share a scaffold for one reason that is not cosmetic: a screen opened for
one step can go stale -- a redelivery carries the ritual forward, or the member
approves on another device -- so it re-checks the pending step before offering a
button, and `approve` checks again in the manager and ignores a mismatch.
"Not now" does not refuse on the member's behalf. There is no "no" in ChillDKG
short of abandoning the ceremony, and quietly leaving is what a member who is not
ready actually wants; abandoning stays on the ritual screen where the consequence
can be spelled out.
A chat line announces each request, written once per step and guarded by
`approvalRequestedThrough` -- `advance` runs on every arriving message and would
otherwise ask again on each one. It is the one ritual line that asks rather than
reports, so it is the one that is not quiet: primary tint, a Review affordance,
and a tap through to the ritual screen, whose bottom bar routes to the step the
ceremony is actually waiting on.
## Telling the steps apart
The request started as a single message type, which meant one icon for all three
and no way to tell "join the ceremony" from "confirm the key". The type is the
only thing a transcript keeps -- a line drawn days later has no session to ask
what was being requested -- so the step moved into it, one type per step, and
every stage now carries its own icon.
MIGRATION_3_4 rewrites the rows already written. They cannot regenerate: a request
is announced once, so a ceremony already in flight would keep its undifferentiated
icons forever. It changes no schema at all -- the version bump exists only to give
a data rewrite somewhere to run, which is why it is a manual migration on the
builder rather than another AutoMigration. Rows it cannot match keep the old type,
which the renderer still recognises.
An answered request shows a checkmark where Review was. Whether it was answered
comes from the transcript rather than the session: approving is the only thing
that causes the step to be published, and publishing writes an authored line, so a
matching line at or after the request means done. That keeps a room that has run
more than one ceremony correct -- ChatMessage has no session id to disambiguate
with -- and needs no DkgRepository in the message list. The comparison is on
createdAt rather than list position, because the list is ORDER BY createdAt DESC
with reverseLayout, where index arithmetic runs backwards.
Compiles and assembles; the ordering test still passes. No ritual has been run on
a device.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Kgothatso Ngako
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3995cdefc6 |
feat: run a ChillDKG ritual over a NIP-17 group
Robust groups can now generate a FROST threshold key together. The
group's members are the participants, the room's creator is the
coordinator, and the whole protocol travels as gift-wrapped rumors on
the chat the group already has -- so there is no second transport to
build, operate or debug.
This is what the quorum has been reaching for since it was introduced.
Until now "t of n must approve" had no key to approve anything with;
ChillDKG produces one that no single member holds.
## Transport: seven rumor kinds (nostr/dkg/)
coordinator --[ 30310 proposal ]-> everyone
participant --[ 30311 host key ]-> everyone
participant --[ 30312 round 1 ]-> everyone ParticipantMsg1
coordinator --[ 30313 coord round 1 ]-> everyone CoordinatorMsg1
participant --[ 30314 round 2 ]-> everyone ParticipantMsg2
coordinator --[ 30315 certificate ]-> everyone CoordinatorMsg2
anyone --[ 30316 failure ]-> everyone abort + reason
These only ever exist inside a NIP-17 gift wrap, so no relay sees them
unencrypted and the replaceable semantics normally implied by the 3xxxx
range never apply -- which is why they can sit next to the app's other
private kinds (30300-30309) without meaning anything different.
Every message is addressed to the whole group, even the two the protocol
only needs the coordinator to read. NIP-17 wraps per recipient anyway,
ChillDKG treats the coordinator as untrusted by construction, and having
every member observe the ritual is what makes a progress UI possible
without a side channel.
`DkgSessionIdTag` is on every message: a group may abandon an attempt and
start another, and a straggler from the dead one must be dropped rather
than mixed into the live session. `DkgThresholdTag` rides the proposal so
every participant validates the same SessionParams -- disagreement on `t`
fails the session instead of quietly producing a weaker key.
## Persistence: inputs, not state (database/model/Dkg*, schema v2)
DkgSession deliberately stores no protocol state. Reading EncPedPop
confirms randomness enters the participant steps only through the passed
`random`/`auxRand` arguments (`simplSeed = taggedHash("encpedpop seed",
seed + random + encContext)`), so every ChillDkg step is a pure function
of inputs. Keeping the two 32-byte randoms plus the received messages is
therefore enough to recompute any intermediate state on demand, and the
opaque ParticipantState/CoordinatorState objects -- which have no
serialization API -- never need to be persisted at all.
That is not a micro-optimisation. A DKG cannot finish unless all n
members take part, and chat users close apps mid-round; recomputation is
what lets a ritual resume instead of forcing the group to start over.
DkgParticipantMessage is keyed (sessionId, participantPublicKey, kind) so
a redelivered message overwrites rather than accumulates -- relays
redeliver, and a duplicated round-1 message would hand the coordinator a
participant list of the wrong length.
Database goes to version 2 with an AutoMigration: v2 only adds tables, so
Room generates it. Schema 2.json is exported alongside.
## Driving it (managers/ChillDkgRitualManager.kt)
State machine driven entirely by arriving messages: persist, then ask
whether the ritual can move. Because every step is recomputable there is
no long-lived session in memory to lose, and processing is idempotent --
a redelivered message re-runs a step that has already been taken and
changes nothing.
The coordinator is a participant too, so it records its own outbound
messages locally: its round-1 message has to be in its own aggregation
alongside everyone else's. Being the room's creator buys it no authority
here -- ChillDKG's coordinator relays but cannot learn secrets or bias
the key -- only the job of aggregating.
Two decisions worth knowing:
* Host keys are DERIVED, not reused. `sha256("mantra/chilldkg/host-key/v1"
|| nostrSeckey)`. Reusing the nostr identity key directly was the
simpler option, but one secret serving two protocols means a flaw in
either reaches the other. Deriving from the same seed keeps it
recoverable from the wallet backup, which matters because ChillDKG
needs the host secret key to recover a session's outputs and asking
chat users to back up a second secret is how keys get lost.
* Participant order is a bytewise sort of the host public keys. ChillDKG
fails outright if participants disagree on ordering, and a sort is the
only order every device can derive independently from the same set.
Any ChillDkg exception ends the session for this device and is broadcast
as a 30316 so the rest of the group stops waiting, rather than leaving
every member on a spinner that will never resolve.
## Inbound (database/dao/NostrDao.kt)
One branch on the existing decrypted-gift-wrap dispatch, beside the
kind-14 and WelcomeEvent branches, handing ritual kinds to the manager.
## UI (ui/.../DkgRitualScreen.kt + view model, state, route)
Reached from chat room detail via "Shared Key", shown only for rooms with
no MLS state -- i.e. the NIP-17/robust ones. An MLS room has a single
admin and no group key to share, so the entry point would be a lie there.
The screen is a ladder of rounds with real counts ("3 of 5") rather than
a spinner. The unusual thing about a DKG, and the thing the UI has to get
across, is that it needs *everyone* at once; a count says who it is
waiting on, an indeterminate spinner says nothing. The coordinator gets
the start button, everyone else is told who they are waiting for, and a
failed ritual states plainly that no key was created and it is safe to
run again.
DkgSession.threshold finally gives the quorum somewhere to live. The
value chosen during group creation is still not persisted on ChatRoom,
so this screen re-asks with the same majority default rather than
inventing a different one; there is a TODO where that gap closes.
Verified:
./gradlew :composeApp:compileCommonMainKotlinMetadata
./gradlew :composeApp:compileDebugKotlinAndroid
Not runtime-verified: exercising a DKG needs several devices exchanging
live messages, and the library's own vector suite needs JDK 21.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Kgothatso Ngako
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3a830d77d6 | Add chat room id on mantra tables | ||
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Kgothatso Ngako
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3640a77413 | Add more associations | ||
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Kgothatso Ngako
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03c3e56b26 | Bug fix for translationChapter primary key | ||
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Kgothatso Ngako
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6cdddee424 | Rename TorchDatabase to MantraDatabase |