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Add anonymous envelope (zk) verification with test
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // Package zk provides utilities around the zkSNARK (Groth16) tooling. | ||
| package zk | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io/ioutil" | ||
| "math/big" | ||
|
|
||
| "github.com/vocdoni/go-snark/parsers" | ||
| "github.com/vocdoni/go-snark/types" | ||
| models "go.vocdoni.io/proto/build/go/models" | ||
| ) | ||
|
|
||
| func LoadVkFromFile(path string) (*types.Vk, error) { | ||
| vkJSON, err := ioutil.ReadFile(path) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| vk, err := parsers.ParseVk(vkJSON) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return vk, nil | ||
| } | ||
|
|
||
| func ProtobufZKProofToCircomProof(p *models.ProofZkSNARK) (*types.Proof, []*big.Int, error) { | ||
| if len(p.A) != 3 && len(p.B) != 6 && len(p.C) != 3 { | ||
| return nil, nil, fmt.Errorf("error on zkProof format") | ||
| } | ||
| proofString := parsers.ProofString{ | ||
| A: p.A, | ||
| B: [][]string{ | ||
| { | ||
| p.B[0], | ||
| p.B[1], | ||
| }, | ||
| { | ||
| p.B[2], | ||
| p.B[3], | ||
| }, | ||
| { | ||
| p.B[4], | ||
| p.B[5], | ||
| }, | ||
| }, | ||
| C: p.C, | ||
| } | ||
| publicInputsString := p.PublicInputs | ||
|
|
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| // parse zkProof & PublicInputs from tx.Proof | ||
| proof, err := parsers.ProofStringToProof(proofString) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| publicInputs, err := parsers.PublicSignalsStringToPublicSignals(publicInputsString) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| return proof, publicInputs, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| package zk | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "math/big" | ||
| "testing" | ||
|
|
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| qt "github.com/frankban/quicktest" | ||
| models "go.vocdoni.io/proto/build/go/models" | ||
| ) | ||
|
|
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| func TestProtobufZKProofToCircomProof(t *testing.T) { | ||
| protoProof := &models.ProofZkSNARK{ | ||
| A: []string{ | ||
| "17569240301865190069940703408776620561950070507358357198130890464508555015742", | ||
| "14719281396036152924308513019111720587276284390020911371919541479835430607528", | ||
| "1", | ||
| }, | ||
| B: []string{ | ||
| "19366523330111704407267566338410994924319459949138724547828188860719056192113", | ||
| "3554431156699466263343064300468289853516840393068286815512868805374822045471", | ||
| "7069001739799325309551446576989712671469685847725867674777886436500905588451", | ||
| "9519609195825772265125524447464801412742967232326200600178197674408796399758", | ||
| "1", | ||
| "0", | ||
| }, | ||
| C: []string{ | ||
| "1803067082675811010286176187174786634523306099072027370858753233512049893073", | ||
| "12821812994233574817558778896965446058705557189286765124075749479926329638171", | ||
| "1", | ||
| }, | ||
| PublicInputs: []string{"1", "2", "3"}, | ||
| } | ||
| proof, pubInputs, err := ProtobufZKProofToCircomProof(protoProof) | ||
| qt.Assert(t, err, qt.IsNil) | ||
|
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||
| expectedStr := `{"pi_a":"26d7d66de7e4ed7fa7abf7078ef9e4e45bf0000787c451874ee9f31c930bb63e208ad16ae0f6916670dcf183c1d23efe1e2ddc45dbb138d922c79ad1b4bcdaa8","pi_b":"07dbbc9b161442d63d59869a61a2b1724f49f8ce7cd83f92bc33edf4e697d71f2ad1105288e9d12915b079725ad629845a3c6cdd4311b21778be06cc82ae8271150be869d01f1fcb87fb7f4930e690c3b873d29529f3d9db0f8021253806a88e0fa0e9c753288b4110ef539418f37c30de082a0bc60083222e8ca6694b2ef6e3","pi_c":"03fc7ff321b29905a8a64f324906272e69c9a0e7b097b523ef57fc6a320f5ed11c58e39436354cb151affb97a664401f1eb6b54a9f3a6a366543bf6813f5fd1b"}` | ||
|
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| proofJSON, err := json.Marshal(proof) | ||
| qt.Assert(t, err, qt.IsNil) | ||
| qt.Assert(t, expectedStr, qt.Equals, string(proofJSON)) | ||
| a := []*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)} | ||
| for i := range a { | ||
| qt.Assert(t, a[i].String(), qt.Equals, pubInputs[i].String()) | ||
| } | ||
| } |
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