go-snark 
Go implementation of the Groth16 protocol zkSNARK prover & verifier compatible with:
Using bn256 (used by go-ethereum) for the Pairing curve operations.
Usage
- Generate Proof
import (
"github.com/vocdoni/go-snark/parsers"
"github.com/vocdoni/go-snark/prover"
"github.com/vocdoni/go-snark/verifier"
)
[...]
// read ProvingKey & Witness files
provingKeyJSON, _ := ioutil.ReadFile("../testdata/circuit1k/proving_key.json")
witnessJSON, _ := ioutil.ReadFile("../testdata/circuit1k/witness.json")
// parse Proving Key
pk, _ := parsers.ParsePk(provingKeyJSON)
// parse Witness
w, _ := parsers.ParseWitness(witnessJSON)
// generate the proof
proof, pubSignals, _ := prover.GenerateProof(pk, w)
// print proof & publicSignals
proofStr, _ := parsers.ProofToJSON(proof)
publicStr, _ := json.Marshal(parsers.ArrayBigIntToString(pubSignals))
fmt.Println(proofStr)
fmt.Println(publicStr)- Verify Proof
// read proof & verificationKey & publicSignals
proofJSON, _ := ioutil.ReadFile("../testdata/circuit1k/proof.json")
vkJSON, _ := ioutil.ReadFile("../testdata/circuit1k/verification_key.json")
publicJSON, _ := ioutil.ReadFile("../testdata/circuit1k/public.json")
// parse proof & verificationKey & publicSignals
public, _ := parsers.ParsePublicSignals(publicJSON)
proof, _ := parsers.ParseProof(proofJSON)
vk, _ := parsers.ParseVk(vkJSON)
// verify the proof with the given verificationKey & publicSignals
v := verifier.Verify(vk, proof, public)
fmt.Println(v)CLI
From the cli directory:
- Show options
> go run cli.go -help
go-snark
v0.0.1
Usage of go-snark:
-proof string
proof path (default "proof.json")
-prove
prover mode
-provingkey string
provingKey path (default "proving_key.json")
-public string
public signals path (default "public.json")
-verificationkey string
verificationKey path (default "verification_key.json")
-verify
verifier mode
-witness string
witness path (default "witness.json")
- Prove
> go run cli.go -prove -provingkey=../testdata/circuit5k/proving_key.json -witness=../testdata/circuit5k/witness.json
- Verify
> go run cli.go -verify -verificationkey=../testdata/circuit5k/verification_key.json
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