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banderwagon: extract canonical home, ipa imports from here

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The Banderwagon prime-order group used by Verkle / IPA had been vendored
internally under lux/crypto/ipa/banderwagon. Extract it to
lux/crypto/banderwagon as the canonical Lux public surface; rewrite all
internal ipa callers (prover, verifier, config, multiproof, common,
transcript, test_helper, tests) to import from the canonical home.

- Provenance comment on every file: github.com/crate-crypto/go-ipa
  (Apache-2.0 / MIT dual). Adds LICENSE-GO-IPA-APACHE2 and
  LICENSE-GO-IPA-MIT alongside the package.
- Element / Generator / Identity / Fr / MSMPrecomp / PrecompPoint /
  CompressedSize / UncompressedSize / SetBytes / SetBytesUncompressed /
  ElementsToBytes / BatchToBytesUncompressed / BatchNormalize /
  MapToScalarField / BatchMapToScalarField / Add / Sub / Double / Neg /
  ScalarMul / MultiExp now have one and only one home: lux/crypto/banderwagon.
- Verkle (parallel branch) will switch its banderwagon import to this
  canonical surface.
- KAT vectors from the upstream go-ipa Verkle reference suite preserved
  (TestEncodingFixedVectors, TestPointAtInfinityComponent) plus all
  precomp MSM-vs-gnark random-round tests (1000 * NumCPU rounds).

Tests: go test ./banderwagon/... ./ipa/... — all PASS (banderwagon 27s,
ipa 16s, ipa/bandersnatch 24s, fp/fr 4s+2s, common 3s).
This commit is contained in:
Hanzo AI
2026-04-27 15:07:37 -07:00
parent 640254c13d
commit 222f3d8827
21 changed files with 274 additions and 10 deletions
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banderwagon/LICENSE-GO-IPA-APACHE2
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banderwagon/LICENSE-GO-IPA-MIT
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@@ -0,0 +1,21 @@
MIT License
Copyright (c) 2023 Crate Crypto
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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ipa/banderwagon/element.go → banderwagon/element.go
+15
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@@ -1,3 +1,18 @@
// Copyright (C) 2026 Lux Industries Inc. All rights reserved.
// Copyright (C) Crate Crypto contributors.
// Licensed under Apache-2.0 OR MIT (see LICENSE-GO-IPA-APACHE2, LICENSE-GO-IPA-MIT).
//
// Provenance: ported from github.com/crate-crypto/go-ipa/banderwagon
// (commit 5d33700 family, Apache-2.0 / MIT dual licensed). This file is the
// canonical Lux home for the Banderwagon prime-order group used by Verkle
// trees and the IPA argument. Other lux/crypto packages MUST import from here
// rather than redefining Element / Identity / Generator.
//
// Banderwagon is the prime-order subgroup of the Bandersnatch curve, defined
// by quotienting Bandersnatch by its order-2 torsion. The encoding takes the
// affine x-coordinate, multiplied by the sign of y so that {(x, y), (-x, -y)}
// share a single 32-byte representation.
package banderwagon
import (
ipa/banderwagon/element_test.go → banderwagon/element_test.go
+9
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@@ -1,3 +1,11 @@
// Copyright (C) 2026 Lux Industries Inc. All rights reserved.
// Copyright (C) Crate Crypto contributors.
// Licensed under Apache-2.0 OR MIT (see LICENSE-GO-IPA-APACHE2, LICENSE-GO-IPA-MIT).
//
// Provenance: ported from github.com/crate-crypto/go-ipa/banderwagon.
// KAT vectors (TestEncodingFixedVectors and TestPointAtInfinityComponent)
// are upstream from the go-ipa Verkle reference suite.
package banderwagon
import (
@@ -320,6 +328,7 @@ func TestBatchNormalize(t *testing.T) {
if err := expectedB.Set(&B).Normalize(); err == nil {
t.Fatal("points at infinity can't be normalized")
}
_ = expectedB
if err := BatchNormalize([]*Element{&A, &B}); err == nil {
t.Fatal("points at infinity can't be normalized")
ipa/banderwagon/multiexp.go → banderwagon/multiexp.go
+6
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@@ -1,3 +1,9 @@
// Copyright (C) 2026 Lux Industries Inc. All rights reserved.
// Copyright (C) Crate Crypto contributors.
// Licensed under Apache-2.0 OR MIT (see LICENSE-GO-IPA-APACHE2, LICENSE-GO-IPA-MIT).
//
// Provenance: ported from github.com/crate-crypto/go-ipa/banderwagon.
package banderwagon
import (
ipa/banderwagon/precomp.go → banderwagon/precomp.go
+6
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@@ -1,3 +1,9 @@
// Copyright (C) 2026 Lux Industries Inc. All rights reserved.
// Copyright (C) Crate Crypto contributors.
// Licensed under Apache-2.0 OR MIT (see LICENSE-GO-IPA-APACHE2, LICENSE-GO-IPA-MIT).
//
// Provenance: ported from github.com/crate-crypto/go-ipa/banderwagon.
package banderwagon
import (
ipa/banderwagon/precomp_test.go → banderwagon/precomp_test.go
+6
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@@ -1,3 +1,9 @@
// Copyright (C) 2026 Lux Industries Inc. All rights reserved.
// Copyright (C) Crate Crypto contributors.
// Licensed under Apache-2.0 OR MIT (see LICENSE-GO-IPA-APACHE2, LICENSE-GO-IPA-MIT).
//
// Provenance: ported from github.com/crate-crypto/go-ipa/banderwagon.
package banderwagon
import (
ipa/banderwagon/testdata/fuzz/FuzzDeserializationCompressed/caf81e9797b19c76 → banderwagon/testdata/fuzz/FuzzDeserializationCompressed/caf81e9797b19c76
Vendored
View File
ipa/banderwagon/testdata/fuzz/FuzzDeserializationCompressed/eb7c0abe34b38b16 → banderwagon/testdata/fuzz/FuzzDeserializationCompressed/eb7c0abe34b38b16
Vendored
View File
ipa/banderwagon/testdata/fuzz/FuzzDeserializationUncompressed/582528ddfad69eb5 → banderwagon/testdata/fuzz/FuzzDeserializationUncompressed/582528ddfad69eb5
Vendored
View File
ipa/banderwagon/testdata/fuzz/FuzzDeserializationUncompressed/c7975161c15228cf → banderwagon/testdata/fuzz/FuzzDeserializationUncompressed/c7975161c15228cf
Vendored
View File
ipa/common/common.go
+1 -1
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@@ -4,8 +4,8 @@ import (
"fmt"
"io"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
)
// VectorLength is the number of elements in the vector. This value is fixed.
ipa/common/transcript.go
+1 -1
View File
@@ -5,8 +5,8 @@ import (
"crypto/sha256"
"hash"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
)
// The transcript is used to create challenge scalars.
ipa/common/transcript_test.go
+1 -1
View File
@@ -4,8 +4,8 @@ import (
"encoding/hex"
"testing"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
)
func TestVector0(t *testing.T) {
ipa/ipa/config.go
+1 -1
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@@ -7,9 +7,9 @@ import (
"math"
"runtime"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fp"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
"github.com/luxfi/crypto/ipa/common"
)
ipa/ipa/ipa_test.go
+1 -1
View File
@@ -7,8 +7,8 @@ import (
"os"
"testing"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
"github.com/luxfi/crypto/ipa/common"
"github.com/luxfi/crypto/ipa/test_helper"
)
ipa/ipa/prover.go
+1 -1
View File
@@ -6,8 +6,8 @@ import (
"io"
"math/big"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
"github.com/luxfi/crypto/ipa/common"
)
ipa/ipa/verifier.go
+1 -1
View File
@@ -3,8 +3,8 @@ package ipa
import (
"fmt"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
"github.com/luxfi/crypto/ipa/common"
)
ipa/multiproof.go
+1 -1
View File
@@ -7,8 +7,8 @@ import (
"io"
"runtime"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
"github.com/luxfi/crypto/ipa/common"
"github.com/luxfi/crypto/ipa/ipa"
)
ipa/multiproof_test.go
+1 -1
View File
@@ -10,8 +10,8 @@ import (
"sync"
"testing"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
"github.com/luxfi/crypto/ipa/common"
"github.com/luxfi/crypto/ipa/ipa"
"github.com/luxfi/crypto/ipa/test_helper"
ipa/test_helper/poly.go
+1 -1
View File
@@ -4,8 +4,8 @@ import (
"encoding/hex"
"testing"
"github.com/luxfi/crypto/banderwagon"
"github.com/luxfi/crypto/ipa/bandersnatch/fr"
"github.com/luxfi/crypto/ipa/banderwagon"
)
func TestPoly256(polynomial ...uint64) []fr.Element {