Lux Threshold - Universal Multi-Chain Threshold Signatures

threshold/
├── cmd/threshold-cli/     # CLI tool
├── internal/              # Private implementation
│   ├── bip32/            # BIP-32 key derivation
│   ├── elgamal/          # ElGamal encryption
│   ├── mta/              # Multiplicative-to-Additive conversion
│   ├── ot/               # Oblivious transfer (Extended OT)
│   ├── params/           # Security parameters
│   ├── round/            # Round-based protocol framework
│   ├── test/             # Test infrastructure
│   └── types/            # Internal type definitions
├── pkg/                   # Public API
│   ├── ecdsa/            # ECDSA signature types
│   ├── hash/             # BLAKE3-based hashing
│   ├── math/             # Cryptographic arithmetic (curve, polynomial, sample)
│   ├── paillier/         # Paillier homomorphic encryption
│   ├── party/            # Party identification
│   ├── pedersen/         # Pedersen commitments
│   ├── pool/             # Thread pool for parallelization
│   ├── protocol/         # Protocol handler framework
│   ├── taproot/          # BIP-340/341 Taproot support
│   └── zk/               # 17 zero-knowledge proof systems
├── protocols/             # Protocol implementations
│   ├── adapters/         # Chain-specific adapters
│   ├── bls/              # BLS aggregate signatures
│   ├── cmp/              # CMP ECDSA (CGGMP21)
│   ├── doerner/          # 2-of-2 optimized ECDSA
│   ├── example/          # Example protocol usage
│   ├── frost/            # FROST Schnorr/EdDSA
│   ├── lss/              # LSS dynamic resharing
│   ├── quasar/           # Quasar consensus signatures
│   ├── ringtail/         # Post-quantum lattice-based
│   └── tfhe/             # Threshold FHE
└── docs/                  # Documentation

go get github.com/luxfi/threshold@v1.5.5

    "github.com/luxfi/threshold/protocols/cmp"
    "github.com/luxfi/threshold/protocols/adapters"
)

// Generate threshold keys
configs := cmp.Keygen(curve.Secp256k1{}, selfID, parties, threshold, pool)

// Create chain adapter
factory := &adapters.AdapterFactory{}
adapter := factory.NewAdapter("ethereum", adapters.SignatureECDSA)

// Sign transaction
digest, _ := adapter.Digest(transaction)
signature := cmp.Sign(config, signers, digest, pool)
encoded, _ := adapter.Encode(signature)

// Add new parties without reconstructing keys
newConfigs := lss.Reshare(oldConfigs, newParties, newThreshold, pool)

// Emergency rollback
manager := lss.NewRollbackManager(maxGenerations)
restoredConfig, _ := manager.Rollback(targetGeneration)

pqAdapter := adapters.NewRingtailAdapter(256, numParties) // 256-bit PQ security
preprocessing := pqAdapter.GeneratePreprocessing(parties, threshold, 100)
pqSignature := pqAdapter.Sign(message, shares, preprocessing)

github.com/luxfi/crypto@v1.17.28       -- ECDSA, EdDSA, BLS curves
github.com/luxfi/fhe@v1.7.6            -- FHE primitives for TFHE protocol
github.com/luxfi/lattice/v7@v7.0.0     -- Lattice ops for Ringtail (PQ)
github.com/luxfi/ringtail@v0.2.0       -- Post-quantum threshold signatures
github.com/luxfi/log@v1.4.1            -- Structured logging
github.com/cronokirby/saferith@v0.33.0 -- Constant-time big integer arithmetic
github.com/zeebo/blake3@v0.2.4         -- BLAKE3 hashing
github.com/fxamacker/cbor/v2@v2.9.0    -- CBOR binary serialization
github.com/cloudflare/circl@v1.6.3     -- BLS12-381 curve operations

# All tests
go test ./... -timeout 120s

# Protocol-specific
go test ./protocols/cmp/... -timeout 120s
go test ./protocols/frost/... -timeout 120s
go test ./protocols/lss/... -timeout 120s
go test ./internal/ot/... -timeout 120s

# With race detection
go test -race ./... -timeout 180s

# Benchmarks
go test -bench=. ./...