Crate confium_tc 

Confium threshold-cryptography primitives — the headline deliverable.

This crate is a compatibility facade that re-exports the core session primitives from confium_tc_core and adds:

• the cfm_tc_* FFI surface for threshold sessions
• async session coordinator (for globally distributed signers)
• share re-sharing + proactive refresh (committee evolution without changing public key)
• threshold KEM session interface (parallel to signing session)
• Paillier encryption (used by CMP20 / GG18 MtA)

Migration: confium-tc → confium-tc-core

New consumers should depend on confium-tc-core directly for the session primitives (Session, SessionParams, Party, PartyList, Share, TcScheme, etc.). The coordinator, KEM, Paillier, and reshare modules are still being extracted and remain in this crate temporarily.

See TODO.roadmap/04-threshold-cryptography.md — this is the entire reason Confium exists.

Modules

coordinator

Async session coordinator for distributed threshold signing.

error

Error type for the threshold-cryptography crate.

ffi

cfm_tc_* C ABI for the threshold-cryptography session interface.

inprocess

In-process synchronous driver for any registered threshold scheme.

kem

Threshold KEM session interface, parallel to confium-tc (signing).

message

Round message exchanged between parties.

paillier

Paillier homomorphic encryption.

party

Party identity and the roster of participants in a threshold session.

registry

Link-time registry of in-process threshold schemes.

reshare

Share re-sharing and proactive refresh protocol.

schemes

Built-in threshold-cryptography schemes that ship with confium-tc.

session

Session lifecycle: create, round, result, destroy.

share

Opaque handle to a party’s portion of a distributed secret.

share_envelope

Versioned share envelope — canonical wire format for threshold shares.

Macros

register_tc_scheme

Submit a scheme implementation to the link-time registry.

Structs

Message

A single inter-party message belonging to one round of a session.

Party

One participant in a threshold session.

PartyList

Ordered roster of parties for a session.

RoundResult

Outcome of one SessionImpl::round call.

Session

One party’s view of one threshold protocol run.

SessionParams

Parameters handed to Session::create.

Share

A party’s share of a distributed secret.

Enums

Error

TcSchemeKind

Broad category of a threshold scheme. Drives which lifecycle entry points apply (e.g. DKG produces a share on output; signing consumes a share on input).

Traits

SessionImpl

Per-session scheme state, driven round-by-round by the framework.

TcScheme

A registered threshold scheme.

Type Aliases

Result