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Fix the example provided in README.md #470

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merged 2 commits into from
Feb 10, 2023
Merged

Fix the example provided in README.md #470

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f9e5574
Merge pull request #455 from ConsenSys/develop
gbotrel Feb 7, 2023
add1247
Fix the example provided in `README.md`
aybehrouz Feb 9, 2023
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36 changes: 24 additions & 12 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,15 @@ Refer to the [`gnark` User Documentation]
Here is what `x**3 + x + 5 = y` looks like

```golang
package main

import (
"github.com/consensys/gnark-crypto/ecc"
"github.com/consensys/gnark/backend/groth16"
"github.com/consensys/gnark/frontend"
"github.com/consensys/gnark/frontend/cs/r1cs"
)

// CubicCircuit defines a simple circuit
// x**3 + x + 5 == y
type CubicCircuit struct {
Expand All @@ -87,21 +96,24 @@ func (circuit *CubicCircuit) Define(api frontend.API) error {
return nil
}

// compiles our circuit into a R1CS
var circuit CubicCircuit
ccs, err := frontend.Compile(ecc.BN254.ScalarField(), r1cs.NewBuilder, &circuit)
func main() {
// compiles our circuit into a R1CS
var circuit CubicCircuit
ccs, _ := frontend.Compile(ecc.BN254, r1cs.NewBuilder, &circuit)

// groth16 zkSNARK: Setup
pk, vk, err := groth16.Setup(ccs)
// groth16 zkSNARK: Setup
pk, vk, _ := groth16.Setup(ccs)

// witness definition
assignment := CubicCircuit{X: 3, Y: 35}
witness, err := frontend.NewWitness(&assignment, ecc.BN254.ScalarField())
publicWitness, _ := witness.Public()
// witness definition
assignment := CubicCircuit{X: 3, Y: 35}
witness, _ := frontend.NewWitness(&assignment, ecc.BN254)
publicWitness, _ := witness.Public()

// groth16: Prove & Verify
proof, _ := groth16.Prove(ccs, pk, witness)
groth16.Verify(proof, vk, publicWitness)
}

// groth16: Prove & Verify
proof, err := groth16.Prove(ccs, pk, witness)
err := groth16.Verify(proof, vk, publicWitness)
```

## Citing
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