initial example working

cubic.go

@@ -0,0 +1,72 @@
+// Copyright 2020 ConsenSys AG
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+    "fmt"
+    "os"
+    "github.com/consensys/gnark/frontend"
+    "github.com/consensys/gnark-crypto/ecc"
+    "github.com/consensys/gnark/frontend/cs/r1cs"
+    "github.com/consensys/gnark/backend/groth16"
+)
+
+// Circuit defines a simple circuit
+// x**3 + x + 5 == y
+type Circuit struct {
+    // struct tags on a variable is optional
+    // default uses variable name and secret visibility.
+    X frontend.Variable `gnark:"x"`
+    Y frontend.Variable `gnark:",public"`
+}
+
+// Define declares the circuit constraints
+// x**3 + x + 5 == y
+func (circuit *Circuit) Define(api frontend.API) error {
+    x3 := api.Mul(circuit.X, circuit.X, circuit.X)
+    api.AssertIsEqual(circuit.Y, api.Add(x3, circuit.X, 5))
+    return nil
+}
+
+func main() {
+    err := main_impl()
+    if err != nil {
+        fmt.Println(err)
+        os.Exit(1)
+    }
+}
+
+func main_impl() error {
+    var myCircuit Circuit
+    r1cs, err := frontend.Compile(ecc.BN254, r1cs.NewBuilder, &myCircuit)
+    if err != nil {
+        return err
+    }
+
+    assignment := &Circuit{
+        X: "2",
+        Y: "15",
+    }
+    witness, _ := frontend.NewWitness(assignment, ecc.BN254)
+    publicWitness, _ := witness.Public()
+    pk, vk, err := groth16.Setup(r1cs)
+    proof, err := groth16.Prove(r1cs, pk, witness)
+    err = groth16.Verify(proof, vk, publicWitness)
+    if err != nil {
+        return err
+    }
+    fmt.Println(proof)
+    return nil
+}

go.mod

@@ -0,0 +1,15 @@
+module cubic
+
+go 1.19
+
+require (
+	github.com/consensys/gnark v0.7.0 // indirect
+	github.com/consensys/gnark-crypto v0.7.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.2.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.16 // indirect
+	github.com/mmcloughlin/addchain v0.4.0 // indirect
+	github.com/rs/zerolog v1.28.0 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	golang.org/x/sys v0.0.0-20220928140112-f11e5e49a4ec // indirect
+)

go.sum

@@ -0,0 +1,29 @@
+github.com/consensys/gnark v0.7.0 h1:zyI8zPAhSazrZPeQpKIFUHLgrnAuxI+EDrFLNizKb9I=
+github.com/consensys/gnark v0.7.0/go.mod h1:oQnMurInsfe+9rG4l8qh8AFVihfuRCS5H3XPJH/6HPM=
+github.com/consensys/gnark-crypto v0.7.0 h1:rwdy8+ssmLYRqKp+ryRRgQJl/rCq2uv+n83cOydm5UE=
+github.com/consensys/gnark-crypto v0.7.0/go.mod h1:KPSuJzyxkJA8xZ/+CV47tyqkr9MmpZA3PXivK4VPrVg=
+github.com/coreos/go-systemd/v22 v22.3.3-0.20220203105225-a9a7ef127534/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/fxamacker/cbor/v2 v2.2.0 h1:6eXqdDDe588rSYAi1HfZKbx6YYQO4mxQ9eC6xYpU/JQ=
+github.com/fxamacker/cbor/v2 v2.2.0/go.mod h1:TA1xS00nchWmaBnEIxPSE5oHLuJBAVvqrtAnWBwBCVo=
+github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/google/subcommands v1.2.0/go.mod h1:ZjhPrFU+Olkh9WazFPsl27BQ4UPiG37m3yTrtFlrHVk=
+github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
+github.com/mattn/go-isatty v0.0.16 h1:bq3VjFmv/sOjHtdEhmkEV4x1AJtvUvOJ2PFAZ5+peKQ=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mmcloughlin/addchain v0.4.0 h1:SobOdjm2xLj1KkXN5/n0xTIWyZA2+s99UCY1iPfkHRY=
+github.com/mmcloughlin/addchain v0.4.0/go.mod h1:A86O+tHqZLMNO4w6ZZ4FlVQEadcoqkyU72HC5wJ4RlU=
+github.com/mmcloughlin/profile v0.1.1/go.mod h1:IhHD7q1ooxgwTgjxQYkACGA77oFTDdFVejUS1/tS/qU=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
+github.com/rs/zerolog v1.28.0 h1:MirSo27VyNi7RJYP3078AA1+Cyzd2GB66qy3aUHvsWY=
+github.com/rs/zerolog v1.28.0/go.mod h1:NILgTygv/Uej1ra5XxGf82ZFSLk58MFGAUS2o6usyD0=
+github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
+github.com/x448/float16 v0.8.4/go.mod h1:14CWIYCyZA/cWjXOioeEpHeN/83MdbZDRQHoFcYsOfg=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220928140112-f11e5e49a4ec h1:BkDtF2Ih9xZ7le9ndzTA7KJow28VbQW3odyk/8drmuI=
+golang.org/x/sys v0.0.0-20220928140112-f11e5e49a4ec/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=