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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,7 @@ | ||
| # GNARK Pedersen commitment prove & verification | ||
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| [](https://opensource.org/licenses/MIT) | ||
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| This package implement the ZK-SNARk circuit for verifying of the knowledge of the openings to the Pedersen commitment. | ||
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| Check tests [circuit_test.go](./circuit_test.go) for usage example |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,31 @@ | ||
| // Package pedersen_gnark | ||
| // Copyright 2024 Oleg Fomenko. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
| package pedersen_gnark | ||
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| import ( | ||
| tedwards "github.com/consensys/gnark-crypto/ecc/twistededwards" | ||
| "github.com/consensys/gnark/frontend" | ||
| "github.com/consensys/gnark/std/algebra/native/twistededwards" | ||
| ) | ||
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| type Circuit struct { | ||
| Amount frontend.Variable | ||
| Randomness frontend.Variable | ||
| Commitment twistededwards.Point `gnark:",public"` | ||
| H twistededwards.Point `gnark:",public"` | ||
| G twistededwards.Point `gnark:",public"` | ||
| } | ||
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| func (c *Circuit) Define(api frontend.API) error { | ||
| curve, err := twistededwards.NewEdCurve(api, tedwards.BN254) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| recoveredCommitment := curve.Add(curve.ScalarMul(c.H, c.Amount), curve.ScalarMul(c.G, c.Randomness)) | ||
| curve.API().AssertIsEqual(recoveredCommitment.X, c.Commitment.X) | ||
| curve.API().AssertIsEqual(recoveredCommitment.Y, c.Commitment.Y) | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| // Package pedersen_gnark | ||
| // Copyright 2024 Oleg Fomenko. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
| package pedersen_gnark | ||
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| import ( | ||
| "crypto/rand" | ||
| "github.com/consensys/gnark-crypto/ecc" | ||
| "github.com/consensys/gnark-crypto/ecc/bn254/fr" | ||
| bn254 "github.com/consensys/gnark-crypto/ecc/bn254/twistededwards" | ||
| "github.com/consensys/gnark/backend/groth16" | ||
| "github.com/consensys/gnark/frontend" | ||
| "github.com/consensys/gnark/frontend/cs/r1cs" | ||
| "github.com/consensys/gnark/std/algebra/native/twistededwards" | ||
| "math/big" | ||
| "testing" | ||
| ) | ||
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| var curve = bn254.GetEdwardsCurve() | ||
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| func getPoint() *bn254.PointAffine { | ||
| k, err := rand.Int(rand.Reader, &curve.Order) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
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| defer func() { k = nil }() | ||
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| return new(bn254.PointAffine).ScalarMultiplication(&curve.Base, k) | ||
| } | ||
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| func TestCircuitProveAndVerify(t *testing.T) { | ||
| var circuit Circuit | ||
| r1cs, err := frontend.Compile(ecc.BN254.ScalarField(), r1cs.NewBuilder, &circuit) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
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| pk, vk, err := groth16.Setup(r1cs) | ||
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| var assignment Circuit | ||
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| H := getPoint() | ||
| G := getPoint() | ||
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| assignment.H = twistededwards.Point{ | ||
| X: H.X, | ||
| Y: H.Y, | ||
| } | ||
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| assignment.G = twistededwards.Point{ | ||
| X: G.X, | ||
| Y: G.Y, | ||
| } | ||
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| amount := big.NewInt(10) | ||
| randomness := big.NewInt(20) | ||
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| assignment.Amount = new(fr.Element).SetBigInt(amount) | ||
| assignment.Randomness = new(fr.Element).SetBigInt(randomness) | ||
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| commitment := new(bn254.PointAffine).Add( | ||
| new(bn254.PointAffine).ScalarMultiplication(H, amount), | ||
| new(bn254.PointAffine).ScalarMultiplication(G, randomness), | ||
| ) | ||
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| assignment.Commitment = twistededwards.Point{ | ||
| X: commitment.X, | ||
| Y: commitment.Y, | ||
| } | ||
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| witness, err := frontend.NewWitness(&assignment, ecc.BN254.ScalarField()) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
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| publicWitness, err := witness.Public() | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
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| proof, err := groth16.Prove(r1cs, pk, witness) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
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| err = groth16.Verify(proof, vk, publicWitness) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| } |