mirror of
https://github.com/luxfi/math.git
synced 2026-07-27 03:38:49 +00:00
Hanzo AI
e018a9c3d1
ntt, poly, rns, sample
Eight pure-Go reference packages that own the canonical semantics of
every cryptographic-math primitive Lux protocols share. Backends
(AVX2 / NEON / cgo+C++ / CUDA / Metal / WGSL) plug in behind the
substrate; KATs gate byte-equality across them.
Packages added:
* params/ — ModulusID, NTTParamID, FHEParamID, PulsarParamID,
HashSuiteID, BackendID; KATHeader required-fields
schema. Stable string IDs; renaming is a breaking
change.
* backend/ — Policy enum (PureGo / NativeCPU / GPUPreferred /
GPURequired); Resolve(policy, registered) returns the
BackendID per LP-107's fallback chain. GPURequired
returns ErrUnavailable when no GPU backend is
registered.
* codec/ — Bounded readers (closes lattice issues #2 + #4 DoS
class permanently). Limits + LimitError + Reader.
ReadUint{16,32,64}Slice all reject the 70T-element
attack input before allocating; depth + frame-bytes
caps; iterative (no recursion). Regression test
TestReadUint64Slice_RejectsHugeLength encodes the
original lattice issue #4 input.
* modarith/ — Modulus type with QInv, R2, Barrett constants
(computed via math/big once per modulus). AddMod /
SubMod / MulMod (Div64 reference path). MontMulMod /
ToMontgomery / FromMontgomery cross-checked against
MulMod across 100 random Pulsar-Q pairs.
ReductionMode enum byte-equal to lattice/types.
* ntt/ — Service + Backend interface; pure-Go backend
delegates to lattice/v7/ring.SubRing.NTT/INTT (the
canonical Lattigo-derived Montgomery NTT body — no
re-implementation, just dispatch). Round-trip +
batch + determinism tests on Pulsar N=256.
* poly/ — Add / Sub / ScalarMul / PointwiseMul (NTT-domain) /
negacyclic Mul (NTT round-trip). Composes modarith +
ntt; no lower-level reach.
* rns/ — Basis(Moduli, Name) for FHE RNS chains. Single +
two-prime construction validated; rejects even moduli.
Phase 3 will add basis-extension and modulus-switching.
* sample/ — Uniform (rejection sampling, mask-and-retry); Ternary
(density + sign byte); CenteredBinomial (popcount
difference); DiscreteGaussianRejection (6-sigma cutoff).
All take an io.Reader so callers can KAT-replay.
Architecture invariants enforced in package docs:
- Go is the canonical semantic reference.
- Backend selection MUST NOT alter transcript bytes (consensus
paths default to PolicyPureGo / PolicyNativeCPU).
- No unbounded codec readers anywhere near wire formats.
- No re-implementation: where lattice/v7/ring already owns the
canonical body, we delegate, not fork.
- One ID space; renaming is a breaking change.
Test posture: 8/8 packages green via `GOWORK=off go test ./...`.
Phases 3-7 (queued):
3. lattice consumes math
4. pulsar consumes lattice + math
5. fhe consumes math
6. luxcpp/crypto/math native backend mirror
7. cross-runtime KAT release gate
See SUBSTRATE.md for the full posture and migration plan; full LP at
~/work/lux/lps/LP-107-lux-math-substrate.md.
109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
// Copyright (c) 2026 Lux Industries Inc.
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// SPDX-License-Identifier: BSD-3-Clause
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package backend
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import (
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"errors"
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"testing"
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"github.com/luxfi/math/params"
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)
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func TestPolicy_String(t *testing.T) {
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for _, tc := range []struct {
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p Policy
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want string
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}{
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{PolicyPureGo, "pure-go"},
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{PolicyNativeCPU, "native-cpu"},
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{PolicyGPUPreferred, "gpu-preferred"},
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{PolicyGPURequired, "gpu-required"},
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} {
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if got := tc.p.String(); got != tc.want {
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t.Errorf("Policy(%d).String() = %q, want %q", tc.p, got, tc.want)
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}
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}
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}
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func TestPolicy_Validate(t *testing.T) {
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for _, p := range []Policy{
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PolicyPureGo, PolicyNativeCPU, PolicyGPUPreferred, PolicyGPURequired,
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} {
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if err := p.Validate(); err != nil {
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t.Errorf("%s: %v", p, err)
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}
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}
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if err := Policy(99).Validate(); err == nil {
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t.Error("Policy(99).Validate() returned nil")
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}
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}
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func TestResolve_PureGo(t *testing.T) {
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r := map[params.BackendID]bool{params.BackendPureGo: true}
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got, err := Resolve(PolicyPureGo, r)
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if err != nil || got != params.BackendPureGo {
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t.Errorf("PureGo resolve: %v %s", err, got)
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}
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}
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func TestResolve_NativeCPU_Fallback(t *testing.T) {
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// Only pure-go registered; native-cpu policy must fall back.
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r := map[params.BackendID]bool{params.BackendPureGo: true}
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got, err := Resolve(PolicyNativeCPU, r)
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if err != nil || got != params.BackendPureGo {
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t.Errorf("NativeCPU fallback: %v %s", err, got)
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}
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// AVX2 registered: native-cpu should pick it.
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r2 := map[params.BackendID]bool{
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params.BackendPureGo: true, params.BackendAVX2: true,
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}
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got, err = Resolve(PolicyNativeCPU, r2)
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if err != nil || got != params.BackendNative && got != params.BackendAVX2 {
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t.Errorf("NativeCPU with AVX2: %v %s", err, got)
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}
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}
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func TestResolve_GPUPreferred_FallbackChain(t *testing.T) {
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// No GPU, no native — falls back to pure-go.
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r := map[params.BackendID]bool{params.BackendPureGo: true}
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got, err := Resolve(PolicyGPUPreferred, r)
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if err != nil || got != params.BackendPureGo {
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t.Errorf("GPUPreferred → pure-go fallback: %v %s", err, got)
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}
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// CUDA registered: GPUPreferred picks CUDA.
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r2 := map[params.BackendID]bool{
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params.BackendPureGo: true, params.BackendCUDA: true,
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}
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got, err = Resolve(PolicyGPUPreferred, r2)
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if err != nil || got != params.BackendCUDA {
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t.Errorf("GPUPreferred with CUDA: %v %s", err, got)
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}
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}
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func TestResolve_GPURequired_NoGPU_Errors(t *testing.T) {
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r := map[params.BackendID]bool{params.BackendPureGo: true}
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_, err := Resolve(PolicyGPURequired, r)
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if !errors.Is(err, ErrUnavailable) {
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t.Errorf("GPURequired with no GPU: want ErrUnavailable, got %v", err)
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}
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}
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func TestResolve_GPURequired_Metal_OK(t *testing.T) {
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r := map[params.BackendID]bool{params.BackendMetal: true}
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got, err := Resolve(PolicyGPURequired, r)
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if err != nil || got != params.BackendMetal {
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t.Errorf("GPURequired with Metal: %v %s", err, got)
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}
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}
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func TestResolve_UnknownPolicy(t *testing.T) {
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r := map[params.BackendID]bool{params.BackendPureGo: true}
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_, err := Resolve(Policy(99), r)
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if err == nil {
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t.Error("Resolve(unknown) returned nil")
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}
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}
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