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tests/fuzzers/bls12381: Add BLST to fuzzing support (#24249)

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* tests/fuzzers/bls12381: added blst library

* go.mod: added blst dependency

* tests/fuzzers/bls12381: stuff

* tests/fuzzers/bls12381: added blst to pairing fuzzer
This commit is contained in:
Marius van der Wijden
2022-06-02 13:13:28 +02:00
committed by GitHub
parent d8a2305565
commit 3c6d6f7ee8
3 changed files with 58 additions and 13 deletions
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tests/fuzzers/bls12381/bls12381_fuzz.go
+51 -13
View File
@@ -30,19 +30,20 @@ import (
"github.com/consensys/gnark-crypto/ecc/bls12-381/fp"
"github.com/consensys/gnark-crypto/ecc/bls12-381/fr"
"github.com/ethereum/go-ethereum/crypto/bls12381"
blst "github.com/supranational/blst/bindings/go"
)
func FuzzCrossPairing(data []byte) int {
input := bytes.NewReader(data)
// get random G1 points
kpG1, cpG1, err := getG1Points(input)
kpG1, cpG1, blG1, err := getG1Points(input)
if err != nil {
return 0
}
// get random G2 points
kpG2, cpG2, err := getG2Points(input)
kpG2, cpG2, blG2, err := getG2Points(input)
if err != nil {
return 0
}
@@ -63,6 +64,15 @@ func FuzzCrossPairing(data []byte) int {
panic("pairing mismatch gnark / geth ")
}
var b []byte
ctx := blst.PairingCtx(false, b)
// compute pairing using blst
blst.PairingRawAggregate(ctx, blG2, blG1)
blstResult := blst.PairingAsFp12(ctx)
if !(bytes.Equal(blstResult.ToBendian(), bls12381.NewGT().ToBytes(kResult))) {
panic("pairing mismatch blst / geth ")
}
return 1
}
@@ -70,13 +80,13 @@ func FuzzCrossG1Add(data []byte) int {
input := bytes.NewReader(data)
// get random G1 points
kp1, cp1, err := getG1Points(input)
kp1, cp1, bl1, err := getG1Points(input)
if err != nil {
return 0
}
// get random G1 points
kp2, cp2, err := getG1Points(input)
kp2, cp2, bl2, err := getG1Points(input)
if err != nil {
return 0
}
@@ -96,6 +106,11 @@ func FuzzCrossG1Add(data []byte) int {
panic("G1 point addition mismatch gnark / geth ")
}
bl3 := blst.P1AffinesAdd([]*blst.P1Affine{bl1, bl2})
if !(bytes.Equal(cp.Marshal(), bl3.Serialize())) {
panic("G1 point addition mismatch blst / geth ")
}
return 1
}
@@ -103,13 +118,13 @@ func FuzzCrossG2Add(data []byte) int {
input := bytes.NewReader(data)
// get random G2 points
kp1, cp1, err := getG2Points(input)
kp1, cp1, bl1, err := getG2Points(input)
if err != nil {
return 0
}
// get random G2 points
kp2, cp2, err := getG2Points(input)
kp2, cp2, bl2, err := getG2Points(input)
if err != nil {
return 0
}
@@ -129,6 +144,11 @@ func FuzzCrossG2Add(data []byte) int {
panic("G2 point addition mismatch gnark / geth ")
}
bl3 := blst.P2AffinesAdd([]*blst.P2Affine{bl1, bl2})
if !(bytes.Equal(cp.Marshal(), bl3.Serialize())) {
panic("G1 point addition mismatch blst / geth ")
}
return 1
}
@@ -148,7 +168,7 @@ func FuzzCrossG1MultiExp(data []byte) int {
break
}
// get a random G1 point as basis
kp1, cp1, err := getG1Points(input)
kp1, cp1, _, err := getG1Points(input)
if err != nil {
break
}
@@ -183,11 +203,11 @@ func FuzzCrossG1MultiExp(data []byte) int {
return 1
}
func getG1Points(input io.Reader) (*bls12381.PointG1, *gnark.G1Affine, error) {
func getG1Points(input io.Reader) (*bls12381.PointG1, *gnark.G1Affine, *blst.P1Affine, error) {
// sample a random scalar
s, err := randomScalar(input, fp.Modulus())
if err != nil {
return nil, nil, err
return nil, nil, nil, err
}
// compute a random point
@@ -206,14 +226,23 @@ func getG1Points(input io.Reader) (*bls12381.PointG1, *gnark.G1Affine, error) {
panic("bytes(gnark.G1) != bytes(geth.G1)")
}
return kp, cp, nil
// marshal gnark point -> blst point
var p1 *blst.P1Affine
var scalar *blst.Scalar
scalar.Deserialize(s.Bytes())
p1.From(scalar)
if !bytes.Equal(p1.Serialize(), cpBytes) {
panic("bytes(blst.G1) != bytes(geth.G1)")
}
return kp, cp, p1, nil
}
func getG2Points(input io.Reader) (*bls12381.PointG2, *gnark.G2Affine, error) {
func getG2Points(input io.Reader) (*bls12381.PointG2, *gnark.G2Affine, *blst.P2Affine, error) {
// sample a random scalar
s, err := randomScalar(input, fp.Modulus())
if err != nil {
return nil, nil, err
return nil, nil, nil, err
}
// compute a random point
@@ -232,7 +261,16 @@ func getG2Points(input io.Reader) (*bls12381.PointG2, *gnark.G2Affine, error) {
panic("bytes(gnark.G2) != bytes(geth.G2)")
}
return kp, cp, nil
// marshal gnark point -> blst point
var p2 *blst.P2Affine
var scalar *blst.Scalar
scalar.Deserialize(s.Bytes())
p2.From(scalar)
if !bytes.Equal(p2.Serialize(), cpBytes) {
panic("bytes(blst.G2) != bytes(geth.G2)")
}
return kp, cp, p2, nil
}
func randomScalar(r io.Reader, max *big.Int) (k *big.Int, err error) {