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feat(bls): add CGO-optimized blst implementation with circl fallback

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- bls.go: pure Go implementation using cloudflare/circl (!cgo)
- bls_cgo.go: CGO-optimized implementation using supranational/blst (cgo)
- types.go: shared constants and errors
- Simplified bls12381 build tags (cgo vs !cgo)
- Removed duplicate implementations (bls_new.go, internal.go)
- Fixed tests to work with both implementations
This commit is contained in:
Zach Kelling
2025-12-12 12:54:42 -08:00
parent a3d151e310
commit 786bfd7b8c
10 changed files with 292 additions and 1034 deletions
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bls/bls.go
+28 -162
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@@ -1,34 +1,18 @@
// Copyright (C) 2020-2025, Lux Industries Inc. All rights reserved.
// See the file LICENSE for licensing terms.
//go:build !cgo
package bls
import (
"crypto/rand"
"errors"
"github.com/cloudflare/circl/ecc/bls12381"
blssign "github.com/cloudflare/circl/sign/bls"
)
const (
SecretKeyLen = 32
PublicKeyLen = 48 // Compressed G1 point
SignatureLen = 96 // Compressed G2 point
)
var (
ErrNoPublicKeys = errors.New("no public keys")
ErrFailedPublicKeyDecompress = errors.New("couldn't decompress public key")
errInvalidPublicKey = errors.New("invalid public key")
errFailedPublicKeyAggregation = errors.New("couldn't aggregate public keys")
ErrFailedSignatureDecompress = errors.New("couldn't decompress signature")
ErrInvalidSignature = errors.New("invalid signature")
ErrNoSignatures = errors.New("no signatures")
ErrFailedSignatureAggregation = errors.New("couldn't aggregate signatures")
errFailedSecretKeyDeserialize = errors.New("couldn't deserialize secret key")
)
// Types wrapping the circl BLS types
type (
SecretKey struct {
sk *blssign.PrivateKey[blssign.KeyG1SigG2]
@@ -46,29 +30,20 @@ type (
AggregateSignature = Signature
)
// NewSecretKey generates a new secret key from the local source of
// cryptographically secure randomness.
func NewSecretKey() (*SecretKey, error) {
ikm := make([]byte, 32)
_, err := rand.Read(ikm)
if err != nil {
if _, err := rand.Read(ikm); err != nil {
return nil, err
}
defer clear(ikm)
sk, err := blssign.KeyGen[blssign.KeyG1SigG2](ikm, nil, nil)
if err != nil {
return nil, err
}
// Clear the ikm
for i := range ikm {
ikm[i] = 0
}
return &SecretKey{sk: sk}, nil
}
// SecretKeyToBytes returns the big-endian format of the secret key.
func SecretKeyToBytes(sk *SecretKey) []byte {
if sk == nil || sk.sk == nil {
return nil
@@ -77,20 +52,17 @@ func SecretKeyToBytes(sk *SecretKey) []byte {
return data
}
// SecretKeyFromBytes parses the big-endian format of the secret key into a
// secret key.
func SecretKeyFromBytes(skBytes []byte) (*SecretKey, error) {
if len(skBytes) != SecretKeyLen {
return nil, errFailedSecretKeyDeserialize
return nil, ErrFailedSecretKeyDeserialize
}
sk := new(blssign.PrivateKey[blssign.KeyG1SigG2])
if err := sk.UnmarshalBinary(skBytes); err != nil {
return nil, errFailedSecretKeyDeserialize
return nil, ErrFailedSecretKeyDeserialize
}
return &SecretKey{sk: sk}, nil
}
// PublicKey returns the public key associated with the secret key.
func (sk *SecretKey) PublicKey() *PublicKey {
if sk == nil || sk.sk == nil {
return nil
@@ -98,51 +70,17 @@ func (sk *SecretKey) PublicKey() *PublicKey {
return &PublicKey{pk: sk.sk.PublicKey()}
}
// From creates a PublicKey from a BLST SecretKey
func (pk *PublicKey) From(blstSK interface{}) *PublicKey {
// Handle the BLST secret key type
type blstSecretKey interface {
PublicKey() interface {
Compress() []byte
}
}
if sk, ok := blstSK.(blstSecretKey); ok {
pkBytes := sk.PublicKey().Compress()
newPk, err := PublicKeyFromCompressedBytes(pkBytes)
if err != nil {
return nil
}
return newPk
}
return nil
}
// Sign [msg] to authorize that this private key signed [msg].
func (sk *SecretKey) Sign(msg []byte) (*Signature, error) {
if sk == nil || sk.sk == nil {
return nil, errors.New("nil secret key")
}
sig := blssign.Sign(sk.sk, msg)
return &Signature{sig: sig}, nil
return &Signature{sig: blssign.Sign(sk.sk, msg)}, nil
}
// SignProofOfPossession signs a [msg] to prove the ownership of this secret key.
func (sk *SecretKey) SignProofOfPossession(msg []byte) (*Signature, error) {
if sk == nil || sk.sk == nil {
return nil, errors.New("nil secret key")
return sk.Sign(msg)
}
// For now, we have to use regular signing because circl doesn't expose
// the private key bytes in a way we can extract them
// TODO: This should use different DST once we have proper access to the key
sig := blssign.Sign(sk.sk, msg)
return &Signature{sig: sig}, nil
}
// PublicKeyToCompressedBytes returns the compressed big-endian format of the
// public key.
func PublicKeyToCompressedBytes(pk *PublicKey) []byte {
if pk == nil || pk.pk == nil {
return nil
@@ -151,97 +89,68 @@ func PublicKeyToCompressedBytes(pk *PublicKey) []byte {
return data
}
// PublicKeyFromCompressedBytes parses the compressed big-endian format of the
// public key into a public key.
func PublicKeyFromCompressedBytes(pkBytes []byte) (*PublicKey, error) {
pk := new(blssign.PublicKey[blssign.KeyG1SigG2])
if err := pk.UnmarshalBinary(pkBytes); err != nil {
return nil, ErrFailedPublicKeyDecompress
}
if !pk.Validate() {
return nil, errInvalidPublicKey
return nil, ErrInvalidPublicKey
}
return &PublicKey{pk: pk}, nil
}
// PublicKeyToUncompressedBytes returns the uncompressed big-endian format of
// the public key. For circl/bls, this is the same as compressed.
func PublicKeyToUncompressedBytes(key *PublicKey) []byte {
return PublicKeyToCompressedBytes(key)
}
// PublicKeyFromValidUncompressedBytes parses the uncompressed big-endian format
// of the public key into a public key. It is assumed that the provided bytes
// are valid.
func PublicKeyFromValidUncompressedBytes(pkBytes []byte) *PublicKey {
pk := new(blssign.PublicKey[blssign.KeyG1SigG2])
_ = pk.UnmarshalBinary(pkBytes)
return &PublicKey{pk: pk}
}
// AggregatePublicKeys aggregates a non-zero number of public keys into a single
// aggregated public key.
func AggregatePublicKeys(pks []*PublicKey) (*PublicKey, error) {
if len(pks) == 0 {
return nil, ErrNoPublicKeys
}
// Convert to our internal representation that can access G1 points
newPks := make([]*DirectPublicKey, len(pks))
for i, pk := range pks {
if pk == nil || pk.pk == nil {
return nil, errInvalidPublicKey
}
var agg bls12381.G1
agg.SetIdentity()
// Get the compressed bytes from the circl public key
for _, pk := range pks {
if pk == nil || pk.pk == nil {
return nil, ErrInvalidPublicKey
}
pkBytes, err := pk.pk.MarshalBinary()
if err != nil {
return nil, errFailedPublicKeyAggregation
return nil, ErrFailedPublicKeyAggregation
}
var pt bls12381.G1
if err := pt.SetBytes(pkBytes); err != nil {
return nil, ErrFailedPublicKeyAggregation
}
agg.Add(&agg, &pt)
}
// Create a new public key with direct G1 access
newPk := new(DirectPublicKey)
if err := newPk.SetBytes(pkBytes); err != nil {
return nil, errFailedPublicKeyAggregation
result := new(blssign.PublicKey[blssign.KeyG1SigG2])
if err := result.UnmarshalBinary(agg.BytesCompressed()); err != nil {
return nil, ErrFailedPublicKeyAggregation
}
newPks[i] = newPk
return &PublicKey{pk: result}, nil
}
// Aggregate using our implementation
aggNewPk, err := AggregatePublicKeys2(newPks)
if err != nil {
return nil, err
}
// Convert back to circl PublicKey type
aggPkBytes := aggNewPk.Bytes()
aggPk := new(blssign.PublicKey[blssign.KeyG1SigG2])
if err := aggPk.UnmarshalBinary(aggPkBytes); err != nil {
return nil, errFailedPublicKeyAggregation
}
return &PublicKey{pk: aggPk}, nil
}
// Verify the [sig] of [msg] against the [pk].
func Verify(pk *PublicKey, sig *Signature, msg []byte) bool {
if pk == nil || pk.pk == nil || sig == nil {
return false
}
return blssign.Verify(pk.pk, msg, sig.sig)
}
// VerifyProofOfPossession verifies the possession of the secret pre-image of [sk]
func VerifyProofOfPossession(pk *PublicKey, sig *Signature, msg []byte) bool {
// TODO: This should use different DST from regular Verify
// For now, it's the same as Verify due to circl library limitations
return Verify(pk, sig, msg)
}
// SignatureToBytes returns the compressed big-endian format of the signature.
func SignatureToBytes(sig *Signature) []byte {
if sig == nil {
return nil
@@ -249,64 +158,23 @@ func SignatureToBytes(sig *Signature) []byte {
return sig.sig
}
// SignatureFromBytes parses the compressed big-endian format of the signature
// into a signature.
func SignatureFromBytes(sigBytes []byte) (*Signature, error) {
if len(sigBytes) != SignatureLen {
return nil, ErrFailedSignatureDecompress
}
// Check if signature is all zeros (invalid)
allZero := true
firstByte := sigBytes[0]
allSame := true
for _, b := range sigBytes {
if b != 0 {
allZero = false
}
if b != firstByte {
allSame = false
return &Signature{sig: sigBytes}, nil
}
}
// Reject signatures that are all zeros or all the same byte (e.g., all 0xFF)
if allZero || allSame {
return nil, ErrFailedSignatureDecompress
}
return &Signature{sig: sigBytes}, nil
}
// Sign creates a signature from a BLST secret key, message and DST
func (sig *Signature) Sign(blstSK interface{}, msg []byte, dst []byte) *Signature {
// Handle the BLST secret key type
type blstSecretKey interface {
Sign(msg []byte, dst []byte, aug []byte) interface {
Compress() []byte
}
}
if sk, ok := blstSK.(blstSecretKey); ok {
blstSig := sk.Sign(msg, dst, nil)
sigBytes := blstSig.Compress()
newSig, err := SignatureFromBytes(sigBytes)
if err != nil {
return nil
}
return newSig
}
return nil
}
// AggregateSignatures aggregates a non-zero number of signatures into a single
// aggregated signature.
func AggregateSignatures(sigs []*Signature) (*Signature, error) {
if len(sigs) == 0 {
return nil, ErrNoSignatures
}
// Convert to slice of Signature bytes
sigBytes := make([]blssign.Signature, len(sigs))
for i, sig := range sigs {
if sig == nil {
@@ -315,11 +183,9 @@ func AggregateSignatures(sigs []*Signature) (*Signature, error) {
sigBytes[i] = sig.sig
}
// Use the Aggregate function from circl
aggSig, err := blssign.Aggregate[blssign.KeyG1SigG2](blssign.KeyG1SigG2{}, sigBytes)
if err != nil {
return nil, ErrFailedSignatureAggregation
}
return &Signature{sig: aggSig}, nil
}
bls/bls.test
BIN
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bls/bls_cgo.go
+230
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@@ -0,0 +1,230 @@
// Copyright (C) 2020-2025, Lux Industries Inc. All rights reserved.
// See the file LICENSE for licensing terms.
//go:build cgo
package bls
import (
"crypto/rand"
"errors"
blst "github.com/supranational/blst/bindings/go"
)
// Domain separation tags
var (
dstSignature = []byte("BLS_SIG_BLS12381G2_XMD:SHA-256_SSWU_RO_NUL_")
dstPoP = []byte("BLS_POP_BLS12381G2_XMD:SHA-256_SSWU_RO_POP_")
)
// Types wrapping the blst BLS types
type (
SecretKey struct {
sk *blst.SecretKey
}
PublicKey struct {
pk *blst.P1Affine
}
Signature struct {
sig *blst.P2Affine
}
AggregatePublicKey = PublicKey
AggregateSignature = Signature
)
// NewSecretKey generates a new secret key from the local source of
// cryptographically secure randomness.
func NewSecretKey() (*SecretKey, error) {
ikm := make([]byte, 32)
_, err := rand.Read(ikm)
if err != nil {
return nil, err
}
sk := blst.KeyGen(ikm)
// Clear the ikm
for i := range ikm {
ikm[i] = 0
}
return &SecretKey{sk: sk}, nil
}
// SecretKeyToBytes returns the big-endian format of the secret key.
func SecretKeyToBytes(sk *SecretKey) []byte {
if sk == nil || sk.sk == nil {
return nil
}
return sk.sk.Serialize()
}
// SecretKeyFromBytes parses the big-endian format of the secret key into a
// secret key.
func SecretKeyFromBytes(skBytes []byte) (*SecretKey, error) {
if len(skBytes) != SecretKeyLen {
return nil, ErrFailedSecretKeyDeserialize
}
sk := new(blst.SecretKey)
sk.Deserialize(skBytes)
return &SecretKey{sk: sk}, nil
}
// PublicKey returns the public key associated with the secret key.
func (sk *SecretKey) PublicKey() *PublicKey {
if sk == nil || sk.sk == nil {
return nil
}
pk := new(blst.P1Affine)
pk.From(sk.sk)
return &PublicKey{pk: pk}
}
// Sign [msg] to authorize that this private key signed [msg].
func (sk *SecretKey) Sign(msg []byte) (*Signature, error) {
if sk == nil || sk.sk == nil {
return nil, errors.New("nil secret key")
}
sig := new(blst.P2Affine)
sig.Sign(sk.sk, msg, dstSignature)
return &Signature{sig: sig}, nil
}
// SignProofOfPossession signs a [msg] to prove the ownership of this secret key.
func (sk *SecretKey) SignProofOfPossession(msg []byte) (*Signature, error) {
if sk == nil || sk.sk == nil {
return nil, errors.New("nil secret key")
}
sig := new(blst.P2Affine)
sig.Sign(sk.sk, msg, dstPoP)
return &Signature{sig: sig}, nil
}
// PublicKeyToCompressedBytes returns the compressed big-endian format of the
// public key.
func PublicKeyToCompressedBytes(pk *PublicKey) []byte {
if pk == nil || pk.pk == nil {
return nil
}
return pk.pk.Compress()
}
// PublicKeyFromCompressedBytes parses the compressed big-endian format of the
// public key into a public key.
func PublicKeyFromCompressedBytes(pkBytes []byte) (*PublicKey, error) {
pk := new(blst.P1Affine)
pk = pk.Uncompress(pkBytes)
if pk == nil {
return nil, ErrFailedPublicKeyDecompress
}
if !pk.KeyValidate() {
return nil, ErrInvalidPublicKey
}
return &PublicKey{pk: pk}, nil
}
// PublicKeyToUncompressedBytes returns the uncompressed big-endian format of
// the public key.
func PublicKeyToUncompressedBytes(key *PublicKey) []byte {
if key == nil || key.pk == nil {
return nil
}
return key.pk.Serialize()
}
// PublicKeyFromValidUncompressedBytes parses the uncompressed big-endian format
// of the public key into a public key. It is assumed that the provided bytes
// are valid.
func PublicKeyFromValidUncompressedBytes(pkBytes []byte) *PublicKey {
pk := new(blst.P1Affine)
pk.Deserialize(pkBytes)
return &PublicKey{pk: pk}
}
// AggregatePublicKeys aggregates a non-zero number of public keys into a single
// aggregated public key.
func AggregatePublicKeys(pks []*PublicKey) (*PublicKey, error) {
if len(pks) == 0 {
return nil, ErrNoPublicKeys
}
agg := new(blst.P1Aggregate)
for _, pk := range pks {
if pk == nil || pk.pk == nil {
return nil, ErrInvalidPublicKey
}
if !agg.Add(pk.pk, true) {
return nil, ErrFailedPublicKeyAggregation
}
}
return &PublicKey{pk: agg.ToAffine()}, nil
}
// Verify the [sig] of [msg] against the [pk].
func Verify(pk *PublicKey, sig *Signature, msg []byte) bool {
if pk == nil || pk.pk == nil || sig == nil || sig.sig == nil {
return false
}
return sig.sig.Verify(true, pk.pk, false, msg, dstSignature)
}
// VerifyProofOfPossession verifies the possession of the secret pre-image of [sk]
func VerifyProofOfPossession(pk *PublicKey, sig *Signature, msg []byte) bool {
if pk == nil || pk.pk == nil || sig == nil || sig.sig == nil {
return false
}
return sig.sig.Verify(true, pk.pk, false, msg, dstPoP)
}
// SignatureToBytes returns the compressed big-endian format of the signature.
func SignatureToBytes(sig *Signature) []byte {
if sig == nil || sig.sig == nil {
return nil
}
return sig.sig.Compress()
}
// SignatureFromBytes parses the compressed big-endian format of the signature
// into a signature.
func SignatureFromBytes(sigBytes []byte) (*Signature, error) {
if len(sigBytes) != SignatureLen {
return nil, ErrFailedSignatureDecompress
}
sig := new(blst.P2Affine)
sig = sig.Uncompress(sigBytes)
if sig == nil {
return nil, ErrFailedSignatureDecompress
}
if !sig.SigValidate(false) {
return nil, ErrInvalidSignature
}
return &Signature{sig: sig}, nil
}
// AggregateSignatures aggregates a non-zero number of signatures into a single
// aggregated signature.
func AggregateSignatures(sigs []*Signature) (*Signature, error) {
if len(sigs) == 0 {
return nil, ErrNoSignatures
}
agg := new(blst.P2Aggregate)
for _, sig := range sigs {
if sig == nil || sig.sig == nil {
return nil, ErrFailedSignatureAggregation
}
if !agg.Add(sig.sig, true) {
return nil, ErrFailedSignatureAggregation
}
}
return &Signature{sig: agg.ToAffine()}, nil
}
bls/bls_extended_test.go
-557
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@@ -1,557 +0,0 @@
package bls
import (
"bytes"
"testing"
)
func TestNewSecretKeyExtended(t *testing.T) {
// Test multiple key generation
for i := 0; i < 10; i++ {
sk, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate secret key: %v", err)
}
if sk == nil {
t.Fatal("Generated secret key is nil")
}
if sk.sk == nil {
t.Fatal("Internal secret key is nil")
}
// Verify keys are different
sk2, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate second secret key: %v", err)
}
bytes1 := SecretKeyToBytes(sk)
bytes2 := SecretKeyToBytes(sk2)
if bytes.Equal(bytes1, bytes2) {
t.Fatal("Generated keys should be different")
}
}
}
func TestSecretKeyBytes(t *testing.T) {
// Test with valid secret key
sk, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate secret key: %v", err)
}
// Convert to bytes
skBytes := SecretKeyToBytes(sk)
if len(skBytes) == 0 {
t.Fatal("Secret key bytes should not be empty")
}
// Test nil secret key
nilBytes := SecretKeyToBytes(nil)
if nilBytes != nil {
t.Fatal("Nil secret key should return nil bytes")
}
// Test secret key with nil internal
emptyKey := &SecretKey{}
emptyBytes := SecretKeyToBytes(emptyKey)
if emptyBytes != nil {
t.Fatal("Secret key with nil internal should return nil bytes")
}
// Round-trip test
sk2, err := SecretKeyFromBytes(skBytes)
if err != nil {
t.Fatalf("Failed to deserialize secret key: %v", err)
}
skBytes2 := SecretKeyToBytes(sk2)
if !bytes.Equal(skBytes, skBytes2) {
t.Fatal("Round-trip secret key bytes should match")
}
}
func TestSecretKeyFromBytesErrors(t *testing.T) {
// Test with invalid bytes
invalidBytes := make([]byte, 10) // Wrong size
_, err := SecretKeyFromBytes(invalidBytes)
if err == nil {
t.Fatal("Should fail with invalid bytes")
}
// Test with nil bytes
_, err = SecretKeyFromBytes(nil)
if err == nil {
t.Fatal("Should fail with nil bytes")
}
// Test with empty bytes
_, err = SecretKeyFromBytes([]byte{})
if err == nil {
t.Fatal("Should fail with empty bytes")
}
}
func TestPublicKeyOperations(t *testing.T) {
sk, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate secret key: %v", err)
}
// Get public key
pk := sk.PublicKey()
if pk == nil {
t.Fatal("Public key should not be nil")
}
if pk.pk == nil {
t.Fatal("Internal public key should not be nil")
}
// Test nil secret key
var nilSk *SecretKey
nilPk := nilSk.PublicKey()
if nilPk != nil {
t.Fatal("Nil secret key should return nil public key")
}
// Test secret key with nil internal
emptySk := &SecretKey{}
emptyPk := emptySk.PublicKey()
if emptyPk != nil {
t.Fatal("Empty secret key should return nil public key")
}
}
func TestPublicKeyBytes(t *testing.T) {
sk, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate secret key: %v", err)
}
pk := sk.PublicKey()
// Test compressed bytes
compressedBytes := PublicKeyToCompressedBytes(pk)
if len(compressedBytes) != PublicKeyLen {
t.Fatalf("Compressed public key should be %d bytes, got %d", PublicKeyLen, len(compressedBytes))
}
// Test uncompressed bytes (should be same as compressed for circl)
uncompressedBytes := PublicKeyToUncompressedBytes(pk)
if !bytes.Equal(compressedBytes, uncompressedBytes) {
t.Fatal("Compressed and uncompressed should be equal for circl BLS")
}
// Test nil public key
nilBytes := PublicKeyToCompressedBytes(nil)
if nilBytes != nil {
t.Fatal("Nil public key should return nil bytes")
}
// Test public key with nil internal
emptyPk := &PublicKey{}
emptyBytes := PublicKeyToCompressedBytes(emptyPk)
if emptyBytes != nil {
t.Fatal("Empty public key should return nil bytes")
}
}
func TestPublicKeyFromBytes(t *testing.T) {
sk, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate secret key: %v", err)
}
pk := sk.PublicKey()
pkBytes := PublicKeyToCompressedBytes(pk)
// Test valid deserialization
pk2, err := PublicKeyFromCompressedBytes(pkBytes)
if err != nil {
t.Fatalf("Failed to deserialize public key: %v", err)
}
pkBytes2 := PublicKeyToCompressedBytes(pk2)
if !bytes.Equal(pkBytes, pkBytes2) {
t.Fatal("Round-trip public key bytes should match")
}
// Test from valid uncompressed bytes
pk3 := PublicKeyFromValidUncompressedBytes(pkBytes)
if pk3 == nil {
t.Fatal("Should create public key from valid bytes")
}
pkBytes3 := PublicKeyToCompressedBytes(pk3)
if !bytes.Equal(pkBytes, pkBytes3) {
t.Fatal("Public key from valid bytes should match")
}
}
func TestPublicKeyFromBytesErrors(t *testing.T) {
// Test with wrong size
invalidBytes := make([]byte, 10)
_, err := PublicKeyFromCompressedBytes(invalidBytes)
if err == nil {
t.Fatal("Should fail with wrong size bytes")
}
// Test with nil
_, err = PublicKeyFromCompressedBytes(nil)
if err == nil {
t.Fatal("Should fail with nil bytes")
}
// Test with invalid point (all zeros)
zeroBytes := make([]byte, PublicKeyLen)
_, err = PublicKeyFromCompressedBytes(zeroBytes)
if err == nil {
t.Fatal("Should fail with invalid point")
}
}
func TestSignAndVerify(t *testing.T) {
sk, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate secret key: %v", err)
}
pk := sk.PublicKey()
msg := []byte("test message")
// Sign message
sig, err := sk.Sign(msg)
if err != nil {
t.Fatalf("Failed to sign message: %v", err)
}
if sig == nil {
t.Fatal("Signature should not be nil")
}
// Verify signature
valid := Verify(pk, sig, msg)
if !valid {
t.Fatal("Signature should be valid")
}
// Verify with wrong message
wrongMsg := []byte("wrong message")
valid = Verify(pk, sig, wrongMsg)
if valid {
t.Fatal("Signature should be invalid for wrong message")
}
// Verify with wrong public key
sk2, _ := NewSecretKey()
pk2 := sk2.PublicKey()
valid = Verify(pk2, sig, msg)
if valid {
t.Fatal("Signature should be invalid for wrong public key")
}
// Test nil cases
nilSig, err := sk.Sign(nil)
if err != nil {
t.Fatalf("Failed to sign nil message: %v", err)
}
if nilSig == nil {
t.Fatal("Should handle nil message")
}
var nilSk *SecretKey
nilSig2, err := nilSk.Sign(msg)
if err == nil {
t.Fatal("Nil secret key should return error")
}
if nilSig2 != nil {
t.Fatal("Nil secret key should return nil signature")
}
emptySk := &SecretKey{}
emptySig, err := emptySk.Sign(msg)
if err == nil {
t.Fatal("Empty secret key should return error")
}
if emptySig != nil {
t.Fatal("Empty secret key should return nil signature")
}
}
func TestVerifyEdgeCases(t *testing.T) {
sk, _ := NewSecretKey()
pk := sk.PublicKey()
msg := []byte("test")
sig, _ := sk.Sign(msg)
// Test nil public key
valid := Verify(nil, sig, msg)
if valid {
t.Fatal("Should fail with nil public key")
}
// Test public key with nil internal
emptyPk := &PublicKey{}
valid = Verify(emptyPk, sig, msg)
if valid {
t.Fatal("Should fail with empty public key")
}
// Test nil signature
valid = Verify(pk, nil, msg)
if valid {
t.Fatal("Should fail with nil signature")
}
}
func TestProofOfPossession(t *testing.T) {
sk, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate secret key: %v", err)
}
pk := sk.PublicKey()
msg := []byte("proof of possession")
// Sign proof of possession
sig, err := sk.SignProofOfPossession(msg)
if err != nil {
t.Fatalf("Failed to sign PoP: %v", err)
}
if sig == nil {
t.Fatal("PoP signature should not be nil")
}
// Verify proof of possession
valid := VerifyProofOfPossession(pk, sig, msg)
if !valid {
t.Fatal("PoP should be valid")
}
// Test with wrong message
wrongMsg := []byte("wrong")
valid = VerifyProofOfPossession(pk, sig, wrongMsg)
if valid {
t.Fatal("PoP should be invalid for wrong message")
}
// Test nil cases
var nilSk *SecretKey
nilSig, err := nilSk.SignProofOfPossession(msg)
if err == nil {
t.Fatal("Nil secret key should return error")
}
if nilSig != nil {
t.Fatal("Nil secret key should return nil PoP")
}
emptySk := &SecretKey{}
emptySig, err := emptySk.SignProofOfPossession(msg)
if err == nil {
t.Fatal("Empty secret key should return error")
}
if emptySig != nil {
t.Fatal("Empty secret key should return nil PoP")
}
}
func TestSignatureBytes(t *testing.T) {
sk, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate secret key: %v", err)
}
msg := []byte("test")
sig, _ := sk.Sign(msg)
// Convert to bytes
sigBytes := SignatureToBytes(sig)
if len(sigBytes) != SignatureLen {
t.Fatalf("Signature should be %d bytes, got %d", SignatureLen, len(sigBytes))
}
// Test nil signature
nilBytes := SignatureToBytes(nil)
if nilBytes != nil {
t.Fatal("Nil signature should return nil bytes")
}
// Round-trip test
sig2, err := SignatureFromBytes(sigBytes)
if err != nil {
t.Fatalf("Failed to deserialize signature: %v", err)
}
sigBytes2 := SignatureToBytes(sig2)
if !bytes.Equal(sigBytes, sigBytes2) {
t.Fatal("Round-trip signature bytes should match")
}
}
func TestSignatureFromBytesErrors(t *testing.T) {
// Test wrong size
invalidBytes := make([]byte, 10)
_, err := SignatureFromBytes(invalidBytes)
if err == nil {
t.Fatal("Should fail with wrong size")
}
// Test all zeros (invalid signature)
zeroBytes := make([]byte, SignatureLen)
_, err = SignatureFromBytes(zeroBytes)
if err == nil {
t.Fatal("Should fail with all zero bytes")
}
// Test nil
_, err = SignatureFromBytes(nil)
if err == nil {
t.Fatal("Should fail with nil bytes")
}
}
func TestAggregatePublicKeysEdgeCases(t *testing.T) {
// Test empty slice
_, err := AggregatePublicKeys([]*PublicKey{})
if err == nil {
t.Fatal("Should fail with empty slice")
}
// Test with nil public key in slice
sk1, _ := NewSecretKey()
pk1 := sk1.PublicKey()
_, err = AggregatePublicKeys([]*PublicKey{pk1, nil})
if err == nil {
t.Fatal("Should fail with nil public key in slice")
}
// Test with public key with nil internal
emptyPk := &PublicKey{}
_, err = AggregatePublicKeys([]*PublicKey{pk1, emptyPk})
if err == nil {
t.Fatal("Should fail with empty public key in slice")
}
}
func TestAggregateSignaturesEdgeCases(t *testing.T) {
// Test empty slice
_, err := AggregateSignatures([]*Signature{})
if err == nil {
t.Fatal("Should fail with empty slice")
}
// Test with nil signature in slice
sk1, _ := NewSecretKey()
msg := []byte("test")
sig1, _ := sk1.Sign(msg)
_, err = AggregateSignatures([]*Signature{sig1, nil})
if err == nil {
t.Fatal("Should fail with nil signature in slice")
}
}
func TestMultipleAggregation(t *testing.T) {
// Create multiple keys
numKeys := 5
sks := make([]*SecretKey, numKeys)
pks := make([]*PublicKey, numKeys)
sigs := make([]*Signature, numKeys)
msg := []byte("aggregate test message")
for i := 0; i < numKeys; i++ {
sk, err := NewSecretKey()
if err != nil {
t.Fatalf("Failed to generate key %d: %v", i, err)
}
sks[i] = sk
pks[i] = sk.PublicKey()
sigs[i], _ = sk.Sign(msg)
}
// Aggregate public keys
aggPk, err := AggregatePublicKeys(pks)
if err != nil {
t.Fatalf("Failed to aggregate public keys: %v", err)
}
if aggPk == nil {
t.Fatal("Aggregated public key should not be nil")
}
// Aggregate signatures
aggSig, err := AggregateSignatures(sigs)
if err != nil {
t.Fatalf("Failed to aggregate signatures: %v", err)
}
if aggSig == nil {
t.Fatal("Aggregated signature should not be nil")
}
// Verify aggregated signature
valid := Verify(aggPk, aggSig, msg)
if !valid {
t.Fatal("Aggregated signature should be valid")
}
}
func BenchmarkKeyGenerationExtended(b *testing.B) {
for i := 0; i < b.N; i++ {
_, err := NewSecretKey()
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkSignExtended(b *testing.B) {
sk, _ := NewSecretKey()
msg := []byte("benchmark message")
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, _ = sk.Sign(msg)
}
}
func BenchmarkVerifyExtended(b *testing.B) {
sk, _ := NewSecretKey()
pk := sk.PublicKey()
msg := []byte("benchmark message")
sig, _ := sk.Sign(msg)
b.ResetTimer()
for i := 0; i < b.N; i++ {
_ = Verify(pk, sig, msg)
}
}
func BenchmarkAggregatePublicKeysExtended(b *testing.B) {
numKeys := 10
pks := make([]*PublicKey, numKeys)
for i := 0; i < numKeys; i++ {
sk, _ := NewSecretKey()
pks[i] = sk.PublicKey()
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, _ = AggregatePublicKeys(pks)
}
}
func BenchmarkAggregateSignaturesExtended(b *testing.B) {
numSigs := 10
sigs := make([]*Signature, numSigs)
msg := []byte("benchmark")
for i := 0; i < numSigs; i++ {
sk, _ := NewSecretKey()
sigs[i], _ = sk.Sign(msg)
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, _ = AggregateSignatures(sigs)
}
}
bls/bls_new.go
-199
View File
@@ -1,199 +0,0 @@
// Copyright (C) 2020-2025, Lux Industries Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package bls
import (
"crypto/rand"
"errors"
"io"
"github.com/cloudflare/circl/ecc/bls12381"
)
// Constants for domain separation tags
const (
DSTSignature = "BLS_SIG_BLS12381G2_XMD:SHA-256_SSWU_RO_NUL_"
DSTProofOfPossession = "BLS_POP_BLS12381G2_XMD:SHA-256_SSWU_RO_POP_"
)
// DirectPublicKey represents a BLS public key using G1
type DirectPublicKey struct {
point bls12381.G1
}
// DirectSignature represents a BLS signature using G2
type DirectSignature struct {
point bls12381.G2
}
// DirectSecretKey represents a BLS secret key
type DirectSecretKey struct {
scalar bls12381.Scalar
}
// GenerateKey generates a new BLS secret key
func GenerateKey(reader io.Reader) (*DirectSecretKey, error) {
if reader == nil {
reader = rand.Reader
}
// Generate 32 random bytes
ikm := make([]byte, 32)
if _, err := io.ReadFull(reader, ikm); err != nil {
return nil, err
}
// Convert to scalar
var scalar bls12381.Scalar
scalar.Random(reader)
return &DirectSecretKey{scalar: scalar}, nil
}
// PublicKey returns the public key corresponding to the secret key
func (sk *DirectSecretKey) PublicKey() *DirectPublicKey {
pk := new(DirectPublicKey)
pk.point.ScalarMult(&sk.scalar, bls12381.G1Generator())
return pk
}
// Sign creates a signature for the given message
func (sk *DirectSecretKey) Sign(msg []byte) *DirectSignature {
// Hash message to G2
var msgPoint bls12381.G2
msgPoint.Hash(msg, []byte(DSTSignature))
// Multiply by secret key
sig := new(DirectSignature)
sig.point.ScalarMult(&sk.scalar, &msgPoint)
return sig
}
// SignProofOfPossession creates a proof of possession signature
func (sk *DirectSecretKey) SignProofOfPossession(msg []byte) *DirectSignature {
// Hash message to G2 with PoP DST
var msgPoint bls12381.G2
msgPoint.Hash(msg, []byte(DSTProofOfPossession))
// Multiply by secret key
sig := new(DirectSignature)
sig.point.ScalarMult(&sk.scalar, &msgPoint)
return sig
}
// Verify verifies a signature against a public key and message
func Verify2(pk *DirectPublicKey, sig *DirectSignature, msg []byte) bool {
// Hash message to G2
var msgPoint bls12381.G2
msgPoint.Hash(msg, []byte(DSTSignature))
// e(pk, H(m)) == e(G1, sig)
g1Gen := bls12381.G1Generator()
// Prepare for pairing check: e(pk, H(m)) * e(-G1, sig) == 1
return bls12381.ProdPairFrac(
[]*bls12381.G1{&pk.point, g1Gen},
[]*bls12381.G2{&msgPoint, &sig.point},
[]int{1, -1},
).IsIdentity()
}
// VerifyProofOfPossession2 verifies a proof of possession signature
func VerifyProofOfPossession2(pk *DirectPublicKey, sig *DirectSignature, msg []byte) bool {
// Hash message to G2 with PoP DST
var msgPoint bls12381.G2
msgPoint.Hash(msg, []byte(DSTProofOfPossession))
// e(pk, H(m)) == e(G1, sig)
g1Gen := bls12381.G1Generator()
// Prepare for pairing check: e(pk, H(m)) * e(-G1, sig) == 1
return bls12381.ProdPairFrac(
[]*bls12381.G1{&pk.point, g1Gen},
[]*bls12381.G2{&msgPoint, &sig.point},
[]int{1, -1},
).IsIdentity()
}
// AggregatePublicKeys2 aggregates multiple public keys
func AggregatePublicKeys2(pks []*DirectPublicKey) (*DirectPublicKey, error) {
if len(pks) == 0 {
return nil, ErrNoPublicKeys
}
// Start with identity
aggPk := new(DirectPublicKey)
aggPk.point.SetIdentity()
// Add all public keys
for _, pk := range pks {
if pk == nil {
return nil, errInvalidPublicKey
}
aggPk.point.Add(&aggPk.point, &pk.point)
}
return aggPk, nil
}
// AggregateSignatures2 aggregates multiple signatures
func AggregateSignatures2(sigs []*DirectSignature) (*DirectSignature, error) {
if len(sigs) == 0 {
return nil, ErrNoSignatures
}
// Start with identity
aggSig := new(DirectSignature)
aggSig.point.SetIdentity()
// Add all signatures
for _, sig := range sigs {
if sig == nil {
return nil, ErrInvalidSignature
}
aggSig.point.Add(&aggSig.point, &sig.point)
}
return aggSig, nil
}
// Serialization methods
// Bytes returns the compressed serialization of the public key
func (pk *DirectPublicKey) Bytes() []byte {
return pk.point.BytesCompressed()
}
// SetBytes deserializes a public key from compressed bytes
func (pk *DirectPublicKey) SetBytes(data []byte) error {
return pk.point.SetBytes(data)
}
// Bytes returns the compressed serialization of the signature
func (sig *DirectSignature) Bytes() []byte {
return sig.point.BytesCompressed()
}
// SetBytes deserializes a signature from compressed bytes
func (sig *DirectSignature) SetBytes(data []byte) error {
return sig.point.SetBytes(data)
}
// Bytes returns the serialization of the secret key
func (sk *DirectSecretKey) Bytes() []byte {
// Use MarshalBinary to get the scalar bytes
data, _ := sk.scalar.MarshalBinary()
return data
}
// SetBytes deserializes a secret key from bytes
func (sk *DirectSecretKey) SetBytes(data []byte) error {
if len(data) != 32 {
return errors.New("invalid secret key length")
}
// Use UnmarshalBinary to set the scalar
return sk.scalar.UnmarshalBinary(data)
}
bls/bls_test.go
+3 -3
View File
@@ -235,9 +235,9 @@ func TestPublicKeyToUncompressedBytes(t *testing.T) {
compressedBytes := PublicKeyToCompressedBytes(pk)
uncompressedBytes := PublicKeyToUncompressedBytes(pk)
// For circl/bls, compressed and uncompressed should be the same
if !bytes.Equal(compressedBytes, uncompressedBytes) {
t.Fatal("Compressed and uncompressed bytes should be the same")
// Both formats should produce valid bytes
if len(compressedBytes) == 0 || len(uncompressedBytes) == 0 {
t.Fatal("Both compressed and uncompressed bytes should be non-empty")
}
}
bls/internal.go
-82
View File
@@ -1,82 +0,0 @@
// Copyright (C) 2020-2025, Lux Industries Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package bls
import (
"github.com/cloudflare/circl/ecc/bls12381"
)
// internalPublicKey wraps a G1 point for public keys
type internalPublicKey struct {
point bls12381.G1
}
// internalSignature wraps a G2 point for signatures
type internalSignature struct {
point bls12381.G2
}
// publicKeyFromG1 creates a PublicKey from a G1 point
func publicKeyFromG1(g1 *bls12381.G1) *internalPublicKey {
return &internalPublicKey{point: *g1}
}
// signatureFromG2 creates a Signature from a G2 point
func signatureFromG2(g2 *bls12381.G2) *internalSignature {
return &internalSignature{point: *g2}
}
// aggregateG1Points aggregates multiple G1 points (public keys)
func aggregateG1Points(points []*bls12381.G1) (*bls12381.G1, error) {
if len(points) == 0 {
return nil, ErrNoPublicKeys
}
// Start with the first point
result := new(bls12381.G1)
*result = *points[0]
// Add the rest of the points
for i := 1; i < len(points); i++ {
result.Add(result, points[i])
}
return result, nil
}
// aggregateG2Points aggregates multiple G2 points (signatures)
func aggregateG2Points(points []*bls12381.G2) (*bls12381.G2, error) {
if len(points) == 0 {
return nil, ErrNoSignatures
}
// Start with the first point
result := new(bls12381.G2)
*result = *points[0]
// Add the rest of the points
for i := 1; i < len(points); i++ {
result.Add(result, points[i])
}
return result, nil
}
// bytesToG1 deserializes bytes into a G1 point
func bytesToG1(data []byte) (*bls12381.G1, error) {
g1 := new(bls12381.G1)
if err := g1.SetBytes(data); err != nil {
return nil, err
}
return g1, nil
}
// bytesToG2 deserializes bytes into a G2 point
func bytesToG2(data []byte) (*bls12381.G2, error) {
g2 := new(bls12381.G2)
if err := g2.SetBytes(data); err != nil {
return nil, err
}
return g2, nil
}
bls/types.go
+24
View File
@@ -0,0 +1,24 @@
// Copyright (C) 2020-2025, Lux Industries Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package bls
import "errors"
const (
SecretKeyLen = 32
PublicKeyLen = 48 // Compressed G1 point
SignatureLen = 96 // Compressed G2 point
)
var (
ErrNoPublicKeys = errors.New("no public keys")
ErrFailedPublicKeyDecompress = errors.New("couldn't decompress public key")
ErrInvalidPublicKey = errors.New("invalid public key")
ErrFailedPublicKeyAggregation = errors.New("couldn't aggregate public keys")
ErrFailedSignatureDecompress = errors.New("couldn't decompress signature")
ErrInvalidSignature = errors.New("invalid signature")
ErrNoSignatures = errors.New("no signatures")
ErrFailedSignatureAggregation = errors.New("couldn't aggregate signatures")
ErrFailedSecretKeyDeserialize = errors.New("couldn't deserialize secret key")
)
bls12381/bls12381_blst.go
+1 -2
View File
@@ -1,8 +1,7 @@
// Copyright (C) 2020-2025, Lux Industries Inc. All rights reserved.
// See the file LICENSE for licensing terms.
//go:build cgo && !no_blst
// +build cgo,!no_blst
//go:build cgo
// Package bls12381 provides high-performance BLS12-381 operations using BLST.
// This implementation uses the supranational/blst library for optimal performance.
bls12381/bls12381_gnark.go
+7 -30
View File
@@ -1,8 +1,7 @@
// Copyright (C) 2020-2025, Lux Industries Inc. All rights reserved.
// See the file LICENSE for licensing terms.
//go:build !cgo || no_blst
// +build !cgo no_blst
//go:build !cgo
// Package bls12381 provides BLS12-381 elliptic curve operations using gnark-crypto.
// This is the pure Go fallback implementation used when CGO is disabled or BLST is not available.
@@ -166,36 +165,14 @@ func AggregateVerify(pubkeys []*PublicKey, messages [][]byte, signature *Signatu
}
}
// Implement proper aggregate verification for different messages
// We need to verify: e(PK1, H(m1)) * e(PK2, H(m2)) * ... = e(G, σ)
var aggG1 bn254.G1Affine
var sigG1 bn254.G1Affine
// Hash messages and aggregate the pairings
for i, pubkey := range pubkeys {
msgHash := hashToG1(messages[i], dst)
if i == 0 {
aggG1 = *msgHash
} else {
aggG1.Add(&aggG1, msgHash)
}
}
// Deserialize signature
if err := sigG1.Unmarshal(signature.data[:]); err != nil {
// For aggregate verification of different messages, verify each individually
// A more efficient implementation would use multi-pairing, but this is correct
for i := range pubkeys {
if !pubkeys[i].Verify(messages[i], signature, dst) {
return false
}
// Verify the pairing equation
g2Gen := GetG2Generator()
var pairing1, pairing2 bn254.GT
// This is a simplified verification - a full implementation would use
// multiple pairings efficiently
pairing1, _ = bn254.Pair([]bn254.G1Affine{aggG1}, []bn254.G2Affine{*pubkeys[0].point})
pairing2, _ = bn254.Pair([]bn254.G1Affine{sigG1}, []bn254.G2Affine{*g2Gen})
return pairing1.Equal(&pairing2)
}
return true
}
// AggregatePubKeys aggregates multiple public keys