diff --git a/examples/README.md b/examples/README.md index d8e8d05d2..3881b32dc 100644 --- a/examples/README.md +++ b/examples/README.md @@ -20,19 +20,20 @@ You can use `my_wallet.json` to deploy example contracts. See the table below for the detailed examples description. -| Example | Description | -|--------------------------| --- | -| [engine](engine) | This contract demonstrates how to use `runtime` interop package which implements an API for `System.Runtime.*` Neo system calls. Please, refer to the `runtime` [package documentation](../pkg/interop/doc.go) for details. | -| [events](events) | The contract shows how execution notifications with the different arguments types can be sent with the help of `runtime.Notify` function of the `runtime` interop package. Please, refer to the `runtime.Notify` [function documentation](../pkg/interop/runtime/runtime.go) for details. | -| [iterator](iterator) | This example describes a way to work with Neo iterators. Please, refer to the `iterator` [package documentation](../pkg/interop/iterator/iterator.go) for details. | -| [nft-d](nft-d) | NEP-11 divisible NFT. See NEP-11 token standard [specification](https://github.com/neo-project/proposals/blob/master/nep-11.mediawiki) for details. | -| [nft-nd](nft-nd) | NEP-11 non-divisible NFT. See NEP-11 token standard [specification](https://github.com/neo-project/proposals/blob/master/nep-11.mediawiki) for details. | -| [nft-nd-nns](nft-nd-nns) | Neo Name Service contract which is NEP-11 non-divisible NFT. The contract implements methods for Neo domain name system managing such as domains registration/transferring, records addition and names resolving. The package also contains tests implemented with [neotest](https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/neotest). | -| [oracle](oracle) | Oracle demo contract exposing two methods that you can use to process URLs. It uses oracle native contract, see [interop package documentation](../pkg/interop/native/oracle/oracle.go) also. | -| [runtime](runtime) | This contract demonstrates how to use special `_initialize` and `_deploy` methods. See the [compiler documentation](../docs/compiler.md#vm-api-interop-layer ) for methods details. It also shows the pattern for checking owner witness inside the contract with the help of `runtime.CheckWitness` interop [function](../pkg/interop/runtime/runtime.go). | -| [storage](storage) | The contract implements API for basic operations with a contract storage. It shows how to use `storage` interop package. See the `storage` [package documentation](../pkg/interop/storage/storage.go). | -| [timer](timer) | The idea of the contract is to count `tick` method invocations and destroy itself after the third invocation. It shows how to use `contract.Call` interop function to call, update (migrate) and destroy the contract. Please, refer to the `contract.Call` [function documentation](../pkg/interop/contract/contract.go) | -| [token](token) | This contract implements NEP-17 token standard (like NEO and GAS tokens) with all required methods and operations. See the NEP-17 token standard [specification](https://github.com/neo-project/proposals/pull/126) for details. | +| Example | Description | +|----------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| [engine](engine) | This contract demonstrates how to use `runtime` interop package which implements an API for `System.Runtime.*` Neo system calls. Please, refer to the `runtime` [package documentation](../pkg/interop/doc.go) for details. | +| [events](events) | The contract shows how execution notifications with the different arguments types can be sent with the help of `runtime.Notify` function of the `runtime` interop package. Please, refer to the `runtime.Notify` [function documentation](../pkg/interop/runtime/runtime.go) for details. | +| [iterator](iterator) | This example describes a way to work with Neo iterators. Please, refer to the `iterator` [package documentation](../pkg/interop/iterator/iterator.go) for details. | +| [nft-d](nft-d) | NEP-11 divisible NFT. See NEP-11 token standard [specification](https://github.com/neo-project/proposals/blob/master/nep-11.mediawiki) for details. | +| [nft-nd](nft-nd) | NEP-11 non-divisible NFT. See NEP-11 token standard [specification](https://github.com/neo-project/proposals/blob/master/nep-11.mediawiki) for details. | +| [nft-nd-nns](nft-nd-nns) | Neo Name Service contract which is NEP-11 non-divisible NFT. The contract implements methods for Neo domain name system managing such as domains registration/transferring, records addition and names resolving. The package also contains tests implemented with [neotest](https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/neotest). | +| [oracle](oracle) | Oracle demo contract exposing two methods that you can use to process URLs. It uses oracle native contract, see [interop package documentation](../pkg/interop/native/oracle/oracle.go) also. | +| [runtime](runtime) | This contract demonstrates how to use special `_initialize` and `_deploy` methods. See the [compiler documentation](../docs/compiler.md#vm-api-interop-layer ) for methods details. It also shows the pattern for checking owner witness inside the contract with the help of `runtime.CheckWitness` interop [function](../pkg/interop/runtime/runtime.go). | +| [storage](storage) | The contract implements API for basic operations with a contract storage. It shows how to use `storage` interop package. See the `storage` [package documentation](../pkg/interop/storage/storage.go). | +| [timer](timer) | The idea of the contract is to count `tick` method invocations and destroy itself after the third invocation. It shows how to use `contract.Call` interop function to call, update (migrate) and destroy the contract. Please, refer to the `contract.Call` [function documentation](../pkg/interop/contract/contract.go) | +| [token](token) | This contract implements NEP-17 token standard (like NEO and GAS tokens) with all required methods and operations. See the NEP-17 token standard [specification](https://github.com/neo-project/proposals/pull/126) for details. | +| [zkp/cubic_circuit](zkp/cubic_circuit) | This example demonstrates how to create your own circuit and generate Groth-16 proof based on BLS12-381 elliptic curve points with the help of [consensys/gnark](https://pkg.go.dev/github.com/consensys/gnark). It also shows how to generate, deploy and invoke Verifier smart contract to verify proofs for the given circuit on the Neo chain with the help of [zkpbindings](https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/smartcontract/zkpbinding) NeoGo package. The package also contains circuit tests implemented with [gnark/test](https://pkg.go.dev/github.com/consensys/gnark/test) to check the circuit validity and end-to-end proof generation/verification test implemented with [neotest](https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/neotest) to demonstrate how to build, deploy and verify proofs via Verifier smart contract for the given circuit. | ## Compile diff --git a/examples/zkp/cubic_circuit/go.mod b/examples/zkp/cubic_circuit/go.mod new file mode 100644 index 000000000..56329e38d --- /dev/null +++ b/examples/zkp/cubic_circuit/go.mod @@ -0,0 +1,67 @@ +module github.com/nspcc-dev/neo-go/examples/zkp/cubic + +go 1.19 + +require ( + github.com/consensys/gnark v0.8.1 + github.com/consensys/gnark-crypto v0.9.2 + github.com/nspcc-dev/neo-go v0.102.0 + github.com/stretchr/testify v1.8.4 +) + +require ( + github.com/benbjohnson/clock v1.1.0 // indirect + github.com/beorn7/perks v1.0.1 // indirect + github.com/bits-and-blooms/bitset v1.7.0 // indirect + github.com/blang/semver/v4 v4.0.0 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/consensys/bavard v0.1.13 // indirect + github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect + github.com/fxamacker/cbor/v2 v2.4.0 // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/golang/snappy v0.0.1 // indirect + github.com/google/pprof v0.0.0-20230207041349-798e818bf904 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/gorilla/websocket v1.4.2 // indirect + github.com/hashicorp/golang-lru v0.6.0 // indirect + github.com/holiman/uint256 v1.2.0 // indirect + github.com/kr/text v0.2.0 // indirect + github.com/mattn/go-colorable v0.1.12 // indirect + github.com/mattn/go-isatty v0.0.14 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect + github.com/mmcloughlin/addchain v0.4.0 // indirect + github.com/mr-tron/base58 v1.2.0 // indirect + github.com/nspcc-dev/go-ordered-json v0.0.0-20220111165707-25110be27d22 // indirect + github.com/nspcc-dev/rfc6979 v0.2.0 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/prometheus/client_golang v1.13.0 // indirect + github.com/prometheus/client_model v0.2.0 // indirect + github.com/prometheus/common v0.37.0 // indirect + github.com/prometheus/procfs v0.8.0 // indirect + github.com/rogpeppe/go-internal v1.11.0 // indirect + github.com/rs/zerolog v1.29.0 // indirect + github.com/russross/blackfriday/v2 v2.0.1 // indirect + github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect + github.com/syndtr/goleveldb v1.0.1-0.20210305035536-64b5b1c73954 // indirect + github.com/twmb/murmur3 v1.1.5 // indirect + github.com/urfave/cli v1.22.5 // indirect + github.com/x448/float16 v0.8.4 // indirect + go.etcd.io/bbolt v1.3.7 // indirect + go.uber.org/atomic v1.10.0 // indirect + go.uber.org/multierr v1.9.0 // indirect + go.uber.org/zap v1.24.0 // indirect + golang.org/x/crypto v0.12.0 // indirect + golang.org/x/mod v0.12.0 // indirect + golang.org/x/sync v0.3.0 // indirect + golang.org/x/sys v0.11.0 // indirect + golang.org/x/term v0.11.0 // indirect + golang.org/x/text v0.12.0 // indirect + golang.org/x/tools v0.11.1 // indirect + google.golang.org/protobuf v1.31.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + rsc.io/tmplfunc v0.0.3 // indirect +) + +replace github.com/nspcc-dev/neo-go => ../../../ diff --git a/examples/zkp/cubic_circuit/go.sum b/examples/zkp/cubic_circuit/go.sum new file mode 100644 index 000000000..e194290fc --- /dev/null +++ b/examples/zkp/cubic_circuit/go.sum @@ -0,0 +1,659 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod 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b/examples/zkp/cubic_circuit/main.go @@ -0,0 +1,93 @@ +// Package cubic describes how to create and verify proofs on the Neo +// blockchain. The example shows how to check that the prover knows the solution +// of the cubic equation: y = x^3 + x + 5. The example is constructed for +// BLS12-381 curve points using Groth-16 proving system. The example includes +// everything that developer needs to start using ZKP on the Neo platform with +// Go SDK: +// 1. The described cubic circuit implementation. +// 2. The off-chain proof generation with the help of gnark-crypto library. +// 3. The Go verification contract generation and deployment with the help of +// NeoGo library. +// 4. The on-chain proof verification for various sets of input data (implemented +// as end-to-end test). +// 5. A set of unit-tests aimed to check the circuit validity. +package cubic + +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 +// that checks that the prover knows the solution for the provided expression. +// The circuit must declare its public and secret inputs as frontend.Variable. +// At compile time, frontend.Compile(...) recursively parses the struct fields +// that contains frontend.Variable to build the frontend.constraintSystem. +// By default, a frontend.Variable has the gnark:",secret" visibility. +type CubicCircuit struct { + // Struct tags on a variable is optional. + // Default uses variable name and secret visibility. + X frontend.Variable `gnark:"x,secret"` // Secret input. + Y frontend.Variable `gnark:"y,public"` // Public input. +} + +// A gnark circuit must implement the frontend.Circuit interface +// (https://docs.gnark.consensys.net/HowTo/write/circuit_structure). +var _ = frontend.Circuit(&CubicCircuit{}) + +// Define declares the circuit constraints +// x**3 + x + 5 == y. +func (circuit *CubicCircuit) Define(api frontend.API) error { + x3 := api.Mul(circuit.X, circuit.X, circuit.X) + + // Can be used for the circuit debugging. + api.Println("X^3", x3) + + api.AssertIsEqual(circuit.Y, api.Add(x3, circuit.X, 5)) + return nil +} + +// main demonstrates how to build the proof and verify it with the help of gnark +// library. Error handling omitted intentionally to simplify the example. +func main() { + var ( + circuit CubicCircuit + assignment = CubicCircuit{X: 3, Y: 35} + ) + + // Compile our circuit into a R1CS (a constraint system). + ccs, _ := frontend.Compile(ecc.BLS12_381.ScalarField(), r1cs.NewBuilder, &circuit) + + // Once the circuit is compiled, you can run the three algorithms of a zk-SNARK back end: + + // 1. One time setup (groth16 zkSNARK). + pk, vk, _ := groth16.Setup(ccs) + + // Intermediate step: witness definition. + witness, _ := frontend.NewWitness(&assignment, ecc.BLS12_381.ScalarField()) + publicWitness, _ := witness.Public() + + // 2. Proof creation (groth16). + proof, _ := groth16.Prove(ccs, pk, witness) + + // 3. Proof verification (groth16) via gnark-crypto library. + _ = groth16.Verify(proof, vk, publicWitness) + + // 4. If building ZKP systems for Neo, you'll need a verification contract + // deployed to the Neo chain to be able to verify generated proofs. This + // contract can be generated automatically using NeoGo zkpbinding package: + // err := zkpbinding.GenerateVerifier(zkpbinding.Config{ + // VerifyingKey: vk, + // Output: f, // Verifier Go contract writer + // CfgOutput: fCfg, // Verifier Go contract configuration YAML file + // GomodOutput: fMod, // go.mod file for the Verifier contract + // GosumOutput: fSum, // go.sum file for the Verifier contract + // }) + // + // Create arguments to invoke `verifyProof` mathod of Verifier contract: + // verifyProofArgs, err := zkpbinding.GetVerifyProofArgs(proof, publicWitness) + // + // For end-to-end usage example, please, see the TestCubicCircuit_EndToEnd test. +} diff --git a/examples/zkp/cubic_circuit/main_test.go b/examples/zkp/cubic_circuit/main_test.go new file mode 100644 index 000000000..b03790355 --- /dev/null +++ b/examples/zkp/cubic_circuit/main_test.go @@ -0,0 +1,142 @@ +package cubic + +import ( + "os" + "path/filepath" + "testing" + + "github.com/consensys/gnark-crypto/ecc" + "github.com/consensys/gnark/backend/groth16" + "github.com/consensys/gnark/frontend" + "github.com/consensys/gnark/frontend/cs/r1cs" + "github.com/consensys/gnark/test" + "github.com/nspcc-dev/neo-go/pkg/neotest" + "github.com/nspcc-dev/neo-go/pkg/neotest/chain" + "github.com/nspcc-dev/neo-go/pkg/smartcontract/zkpbinding" + "github.com/stretchr/testify/require" +) + +// First of all, you'll need to ensure that your circuit is properly constructed. +// Use unit tests to test execute the circuit and verify it against a various set +// of curves and backends with gnark/test package. +// More about circuit testing using gnark/test package: https://pkg.go.dev/github.com/consensys/gnark/test@v0.7.0 + +// TestCubicCircuit_TestExecution runs the provided circuit in the test execution engine. +func TestCubicCircuit_TestExecution(t *testing.T) { + var ( + circuit CubicCircuit + assignment = CubicCircuit{X: 3, Y: 35} + ) + + // Test executing the circuit without running a ZK-SNARK prover (with the + // help of test engine). It can be useful for the circuit debugging, see + // https://docs.gnark.consensys.net/HowTo/debug_test#common-errors. + err := test.IsSolved(&circuit, &assignment, ecc.BLS12_381.ScalarField()) + require.NoError(t, err) +} + +// TestCubicCircuit_Verification performs the circuit correctness testing over a +// set of all supported curves and backends and over a specified curve with a +// set of exact input and output values. +func TestCubicCircuit_Verification(t *testing.T) { + // Assert object wrapping testing.T. + assert := test.NewAssert(t) + + // Declare the circuit. + var cubicCircuit CubicCircuit + + // The default behavior of the assert helper is to test the circuit across + // all supported curves and backends, ensure correct serialization, and + // cross-test the constraint system solver against a big.Int test execution + // engine. + assert.ProverFailed(&cubicCircuit, &CubicCircuit{ + X: 3, // Wrong value. + Y: 5, + }) + + // If needed, we can directly specify the desired curves or backends. + assert.ProverSucceeded(&cubicCircuit, &CubicCircuit{ + X: 3, // Good value. + Y: 35, + }, test.WithCurves(ecc.BLS12_381)) +} + +// TestCubicCircuit_EndToEnd shows how to generate proof for pre-defined cubic circuit, +// how to generate Go verification contract that can be compiled by NeoGo and deployed +// to the chain and how to verify proofs via verification contract invocation. +func TestCubicCircuit_EndToEnd(t *testing.T) { + var ( + circuit CubicCircuit + assignment = CubicCircuit{X: 3, Y: 35} + ) + + // Compile our circuit into a R1CS (a constraint system). + ccs, err := frontend.Compile(ecc.BLS12_381.ScalarField(), r1cs.NewBuilder, &circuit) + require.NoError(t, err) + + // One time setup (groth16 zkSNARK). + pk, vk, err := groth16.Setup(ccs) + require.NoError(t, err) + + // Intermediate step: witness definition. + witness, err := frontend.NewWitness(&assignment, ecc.BLS12_381.ScalarField()) + require.NoError(t, err) + publicWitness, err := witness.Public() + require.NoError(t, err) + + // Proof creation (groth16). + proof, err := groth16.Prove(ccs, pk, witness) + require.NoError(t, err) + + // Ensure that gnark can successfully verify the proof (just in case). + err = groth16.Verify(proof, vk, publicWitness) + require.NoError(t, err) + + // Now, when we're sure that the proof is valid, we can create and deploy verification + // contract to the Neo testing chain. + args, err := zkpbinding.GetVerifyProofArgs(proof, publicWitness) + require.NoError(t, err) + + // Create contract file. + tmpDir := t.TempDir() + srcPath := filepath.Join(tmpDir, "verify.go") + f, err := os.Create(srcPath) + require.NoError(t, err) + + // Create contract configuration file. + cfgPath := filepath.Join(tmpDir, "verify.yml") + fCfg, err := os.Create(cfgPath) + require.NoError(t, err) + + // Create contract go.mod and go.sum files. + fMod, err := os.Create(filepath.Join(tmpDir, "go.mod")) + require.NoError(t, err) + fSum, err := os.Create(filepath.Join(tmpDir, "go.sum")) + require.NoError(t, err) + + err = zkpbinding.GenerateVerifier(zkpbinding.Config{ + VerifyingKey: vk, + Output: f, + CfgOutput: fCfg, + GomodOutput: fMod, + GosumOutput: fSum, + }) + require.NoError(t, err) + + require.NoError(t, f.Close()) + require.NoError(t, fCfg.Close()) + require.NoError(t, fMod.Close()) + require.NoError(t, fSum.Close()) + + // Create testing chain and deploy contract onto it. + bc, committee := chain.NewSingle(t) + e := neotest.NewExecutor(t, bc, committee, committee) + + // Compile verification contract and deploy the contract onto chain. + c := neotest.CompileFile(t, e.Validator.ScriptHash(), srcPath, cfgPath) + e.DeployContract(t, c, nil) + + // Verify proof via verification contract call. + validatorInvoker := e.ValidatorInvoker(c.Hash) + validatorInvoker.Invoke(t, true, "verifyProof", args.A, args.B, args.C, args.PublicWitnesses) +} diff --git a/examples/zkp/xor_compat/verify.go b/examples/zkp/xor_compat/verify.go index 3f3a8f1e3..4a9c82d1a 100644 --- a/examples/zkp/xor_compat/verify.go +++ b/examples/zkp/xor_compat/verify.go @@ -7,6 +7,12 @@ // not be deployed into chain to verify other circuits. // // This example is constructed to prove that a&b=0 where a and b are private input. +// +// Please, do not use this example to create, proof and verify your own circuits. +// Refer to examples/cubic_circuit package to get an example of a custom circuit +// creation in Go and check out the +// [zkpbinding](https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/smartcontract/zkpbinding) +// package to create your own verification contract for the circuit. package xor import ( diff --git a/go.mod b/go.mod index 397be0bbb..f0d17f2ad 100644 --- a/go.mod +++ b/go.mod @@ -1,8 +1,9 @@ module github.com/nspcc-dev/neo-go require ( - github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e - github.com/consensys/gnark-crypto v0.9.1 + github.com/chzyer/readline v1.5.0 + github.com/consensys/gnark v0.8.1 + github.com/consensys/gnark-crypto v0.9.2 github.com/davecgh/go-spew v1.1.1 github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 github.com/google/uuid v1.3.0 @@ -37,12 +38,17 @@ require ( github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20221202181307-76fa05c21b12 // indirect github.com/benbjohnson/clock v1.1.0 // indirect github.com/beorn7/perks v1.0.1 // indirect + github.com/blang/semver/v4 v4.0.0 // indirect github.com/cespare/xxhash/v2 v2.2.0 // indirect github.com/consensys/bavard v0.1.13 // indirect github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d // indirect github.com/frankban/quicktest v1.14.5 // indirect + github.com/fxamacker/cbor/v2 v2.4.0 // indirect github.com/golang/protobuf v1.5.3 // indirect github.com/golang/snappy v0.0.1 // indirect + github.com/google/pprof v0.0.0-20230207041349-798e818bf904 // indirect + github.com/mattn/go-colorable v0.1.12 // indirect + github.com/mattn/go-isatty v0.0.14 // indirect github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect github.com/mmcloughlin/addchain v0.4.0 // indirect github.com/nspcc-dev/hrw v1.0.9 // indirect @@ -53,9 +59,11 @@ require ( github.com/prometheus/client_model v0.2.0 // indirect github.com/prometheus/common v0.37.0 // indirect github.com/prometheus/procfs v0.8.0 // indirect + github.com/rs/zerolog v1.29.0 // indirect github.com/russross/blackfriday/v2 v2.0.1 // indirect github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect github.com/spaolacci/murmur3 v1.1.0 // indirect + github.com/x448/float16 v0.8.4 // indirect go.uber.org/multierr v1.9.0 // indirect golang.org/x/exp v0.0.0-20230801115018-d63ba01acd4b // indirect golang.org/x/mod v0.12.0 // indirect diff --git a/go.sum b/go.sum index 5c01ec128..97bc5169d 100644 --- a/go.sum +++ b/go.sum @@ -46,23 +46,31 @@ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8= github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM= github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= +github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM= +github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ= github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44= github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= -github.com/chzyer/logex v1.1.10 h1:Swpa1K6QvQznwJRcfTfQJmTE72DqScAa40E+fbHEXEE= github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI= -github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e h1:fY5BOSpyZCqRo5OhCuC+XN+r/bBCmeuuJtjz+bCNIf8= +github.com/chzyer/logex v1.2.0 h1:+eqR0HfOetur4tgnC8ftU5imRnhi4te+BadWS95c5AM= +github.com/chzyer/logex v1.2.0/go.mod h1:9+9sk7u7pGNWYMkh0hdiL++6OeibzJccyQU4p4MedaY= github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI= -github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 h1:q763qf9huN11kDQavWsoZXJNW3xEE4JJyHa5Q25/sd8= +github.com/chzyer/readline v1.5.0 h1:lSwwFrbNviGePhkewF1az4oLmcwqCZijQ2/Wi3BGHAI= +github.com/chzyer/readline v1.5.0/go.mod h1:x22KAscuvRqlLoK9CsoYsmxoXZMMFVyOl86cAH8qUic= github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU= +github.com/chzyer/test v0.0.0-20210722231415-061457976a23 h1:dZ0/VyGgQdVGAss6Ju0dt5P0QltE0SFY5Woh6hbIfiQ= +github.com/chzyer/test v0.0.0-20210722231415-061457976a23/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU= github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc= github.com/consensys/bavard v0.1.13 h1:oLhMLOFGTLdlda/kma4VOJazblc7IM5y5QPd2A/YjhQ= github.com/consensys/bavard v0.1.13/go.mod h1:9ItSMtA/dXMAiL7BG6bqW2m3NdSEObYWoH223nGHukI= -github.com/consensys/gnark-crypto v0.9.1 h1:mru55qKdWl3E035hAoh1jj9d7hVnYY5pfb6tmovSmII= -github.com/consensys/gnark-crypto v0.9.1/go.mod h1:a2DQL4+5ywF6safEeZFEPGRiiGbjzGFRUN2sg06VuU4= +github.com/consensys/gnark v0.8.1 h1:zXM6iFejCJSwqkZsjS/qMQGLEyX0rg8nRhwuEwzj3bg= +github.com/consensys/gnark v0.8.1/go.mod h1:PsGdLgX5nBy9EsDbqBkvTncZbfT69MizMsveGAsHBbo= +github.com/consensys/gnark-crypto v0.9.2 h1:a4gsSAnQNgrt8dqxsd49H2rtLQPoekZCWpCmcKPRNus= +github.com/consensys/gnark-crypto v0.9.2/go.mod h1:a2DQL4+5ywF6safEeZFEPGRiiGbjzGFRUN2sg06VuU4= +github.com/coreos/go-systemd/v22 v22.3.3-0.20220203105225-a9a7ef127534/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc= github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY= github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU= github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= @@ -81,6 +89,8 @@ github.com/frankban/quicktest v1.14.5/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7z github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo= github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4= github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ= +github.com/fxamacker/cbor/v2 v2.4.0 h1:ri0ArlOR+5XunOP8CRUowT0pSJOwhW098ZCUyskZD88= +github.com/fxamacker/cbor/v2 v2.4.0/go.mod h1:TA1xS00nchWmaBnEIxPSE5oHLuJBAVvqrtAnWBwBCVo= github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU= github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8= github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8= @@ -93,6 +103,7 @@ github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A= github.com/go-logfmt/logfmt v0.5.1/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs= github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= +github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA= github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ= github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc= @@ -148,6 +159,8 @@ github.com/google/pprof v0.0.0-20200212024743-f11f1df84d12/go.mod h1:ZgVRPoUq/hf github.com/google/pprof v0.0.0-20200229191704-1ebb73c60ed3/go.mod h1:ZgVRPoUq/hfqzAqh7sHMqb3I9Rq5C59dIz2SbBwJ4eM= github.com/google/pprof v0.0.0-20200430221834-fc25d7d30c6d/go.mod h1:ZgVRPoUq/hfqzAqh7sHMqb3I9Rq5C59dIz2SbBwJ4eM= github.com/google/pprof v0.0.0-20200708004538-1a94d8640e99/go.mod h1:ZgVRPoUq/hfqzAqh7sHMqb3I9Rq5C59dIz2SbBwJ4eM= +github.com/google/pprof v0.0.0-20230207041349-798e818bf904 h1:4/hN5RUoecvl+RmJRE2YxKWtnnQls6rQjjW5oV7qg2U= +github.com/google/pprof v0.0.0-20230207041349-798e818bf904/go.mod h1:uglQLonpP8qtYCYyzA+8c/9qtqgA3qsXGYqCPKARAFg= github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI= github.com/google/subcommands v1.2.0/go.mod h1:ZjhPrFU+Olkh9WazFPsl27BQ4UPiG37m3yTrtFlrHVk= github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I= @@ -187,6 +200,10 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI= github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY= github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE= github.com/leanovate/gopter v0.2.9 h1:fQjYxZaynp97ozCzfOyOuAGOU4aU/z37zf/tOujFk7c= +github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40= +github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4= +github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y= +github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94= github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU= github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0= github.com/mmcloughlin/addchain v0.4.0 h1:SobOdjm2xLj1KkXN5/n0xTIWyZA2+s99UCY1iPfkHRY= @@ -265,6 +282,9 @@ github.com/prometheus/procfs v0.8.0/go.mod h1:z7EfXMXOkbkqb9IINtpCn86r/to3BnA0ua github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4= github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8= github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs= +github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg= +github.com/rs/zerolog v1.29.0 h1:Zes4hju04hjbvkVkOhdl2HpZa+0PmVwigmo8XoORE5w= +github.com/rs/zerolog v1.29.0/go.mod h1:NILgTygv/Uej1ra5XxGf82ZFSLk58MFGAUS2o6usyD0= github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q= github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM= github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo= @@ -290,6 +310,8 @@ github.com/urfave/cli v1.22.5 h1:lNq9sAHXK2qfdI8W+GRItjCEkI+2oR4d+MEHy1CKXoU= github.com/urfave/cli v1.22.5/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0= github.com/virtuald/go-ordered-json v0.0.0-20170621173500-b18e6e673d74 h1:JwtAtbp7r/7QSyGz8mKUbYJBg2+6Cd7OjM8o/GNOcVo= github.com/virtuald/go-ordered-json v0.0.0-20170621173500-b18e6e673d74/go.mod h1:RmMWU37GKR2s6pgrIEB4ixgpVCt/cf7dnJv3fuH1J1c= +github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM= +github.com/x448/float16 v0.8.4/go.mod h1:14CWIYCyZA/cWjXOioeEpHeN/83MdbZDRQHoFcYsOfg= github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= @@ -446,8 +468,11 @@ golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7w golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +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 v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM= golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo= @@ -597,8 +622,8 @@ google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqw gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= -gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo= gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk= gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys= gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ= diff --git a/pkg/smartcontract/zkpbinding/binding.go b/pkg/smartcontract/zkpbinding/binding.go new file mode 100644 index 000000000..2af304898 --- /dev/null +++ b/pkg/smartcontract/zkpbinding/binding.go @@ -0,0 +1,383 @@ +// Package zkpbinding contains a set of helper functions aimed to generate and +// interact with Verifier smart contract written in Go and using Groth-16 proving +// system over BLS12-381 elliptic curve to verify proofs. Package zkpbinding +// provides the Veifier contract generation functionality itself as far as a +// helper that converts groth16.Proof to the Verifier-specific set of arguments. +// +// Please, check out the example of zkpbinding package usage to generate and +// verify proofs on the Neo chain: +// https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/smartcontract/zkpbinding +package zkpbinding + +import ( + "bytes" + "encoding/binary" + "errors" + "fmt" + "io" + "text/template" + + "github.com/consensys/gnark-crypto/ecc" + bls12381 "github.com/consensys/gnark-crypto/ecc/bls12-381" + "github.com/consensys/gnark-crypto/ecc/bn254/fr" + "github.com/consensys/gnark/backend/groth16" + "github.com/consensys/gnark/backend/witness" + "github.com/nspcc-dev/neo-go/pkg/util/slice" +) + +// Config represents a configuration for Verifier Go smart contract generator. +type Config struct { + // VerifyingKey must be a Groth-16 BLS12-381 specific verifier key, + // parameters of which will be used to generate Verifier Neo smart contract. + VerifyingKey groth16.VerifyingKey + // Output is a writer for the resulting Verifier Go smart contract, it must + // not be nil. + Output io.Writer + // CfgOutput is a writer for the resulting Verifier Go smart contract YAML + // configuration file needed to compile the contract. It may be nil if the + // contract configuration file generation should be omitted. + CfgOutput io.Writer + // GomodOutput is a writer for the resulting go.mod file of the Verifier Go + // smart contract needed to compile it. It may be nil if the go.mod file + // generation should be omitted. + GomodOutput io.Writer + // GosumOutput is a writer for the resulting go.sum file of the Verifier Go + // smart contract needed to compile it. It may be nil if the go.sum file + // generation should be omitted. + GosumOutput io.Writer +} + +// A set of Verifier smart contract template related constants. +const ( + // goVerificationTmpl is a verification smart contract template. It contains + // a single `verifyProof` method that accepts a proof represented as three + // BLS12-381 curve points and public information required for verification + // represented as a list of serialized 32-bytes field elements in the LE form. + // The boolean result of `verifyProof` is either `true` (if the proof is + // valid) or `false` (if the proof is invalid). The smart contract generated + // from this template can be immediately compiled without any additional + // changes using NeoGo compiler, deployed to the Neo chain and invoked. The + // verification contract is circuit-specific, i.e. corresponds to a specific + // single constraint system. Thus, every new circuit requires vew verification + // contract to be generated and deployed to the chain. + goVerificationTmpl = `// Package main contains verification smart contract that uses Neo BLS12-381 +// curves interoperability functionality to verify provided proof against provided +// public input. The contract contains a single 'verifyProof' method that accepts +// a proof represented as three BLS12-381 curve points and public witnesses +// required for verification represented as a list of serialized 32-bytes field +// elements in the LE form. This contract is circuit-specific and can not be used +// to verify other circuits. +// +// Use NeoGo smart contract compiler to compile this contract: +// https://github.com/nspcc-dev/neo-go/blob/master/docs/compiler.md#compiling. +// You will need to create contract YAML configuration file and proper go.mod and +// go.sum files required for compilation. Please, refer to the NeoGo ZKP example +// to see how to verify proofs via the Verifier contract: +// https://github.com/nspcc-dev/neo-go/tree/master/examples/zkp/cubic_circuit. +// +// This contract is automatically generated. +package main + +import ( + "github.com/nspcc-dev/neo-go/pkg/interop/native/crypto" + "github.com/nspcc-dev/neo-go/pkg/interop/util" +) + +// A set of circuit-specific variables required for verification. Should be generated +// using MPC process. +var ( + // G1 Affine point. + alpha = []byte{{ byteSliceToStr .Alpha }} + // G2 Affine point. + beta = []byte{{ byteSliceToStr .Beta }} + // G2 Affine point. + gamma = []byte{{ byteSliceToStr .Gamma }} + // G2 Affine point. + delta = []byte{{ byteSliceToStr .Delta }} + // A set of G1 Affine points. + ic = [][]byte{ + {{- range $i := .ICs }} + {{ byteSliceToStr $i }},{{ end -}} + } +) + +// VerifyProof verifies the given proof represented as three serialized compressed +// BLS12-381 points against the public information represented as a list of +// serialized 32-bytes field elements in the LE form. Verification process +// follows the Groth-16 proving system and is taken from the +// https://github.com/neo-project/neo/issues/2647#issuecomment-1002893109 without +// any changes. Verification process checks the following equality: +// A*B = alpha*beta + sum(pub_input[i]*(beta*u_i(x)+alpha*v_i(x)+w_i(x))/gamma)*gamma + C*delta +func VerifyProof(a []byte, b []byte, c []byte, publicInput [][]byte) bool { + alphaPoint := crypto.Bls12381Deserialize(alpha) + betaPoint := crypto.Bls12381Deserialize(beta) + gammaPoint := crypto.Bls12381Deserialize(gamma) + deltaPoint := crypto.Bls12381Deserialize(delta) + + aPoint := crypto.Bls12381Deserialize(a) + bPoint := crypto.Bls12381Deserialize(b) + cPoint := crypto.Bls12381Deserialize(c) + + // Equation left1: A*B + lt := crypto.Bls12381Pairing(aPoint, bPoint) + + // Equation right1: alpha*beta + rt1 := crypto.Bls12381Pairing(alphaPoint, betaPoint) + + // Equation right2: sum(pub_input[i]*(beta*u_i(x)+alpha*v_i(x)+w_i(x))/gamma)*gamma + inputlen := len(publicInput) + iclen := len(ic) + + if iclen != inputlen+1 { + panic("error: inputlen or iclen") + } + icPoints := make([]crypto.Bls12381Point, iclen) + for i := 0; i < iclen; i++ { + icPoints[i] = crypto.Bls12381Deserialize(ic[i]) + } + acc := icPoints[0] + for i := 0; i < inputlen; i++ { + scalar := publicInput[i] // 32-bytes LE field element. + temp := crypto.Bls12381Mul(icPoints[i+1], scalar, false) + acc = crypto.Bls12381Add(acc, temp) + } + rt2 := crypto.Bls12381Pairing(acc, gammaPoint) + + // Equation right3: C*delta + rt3 := crypto.Bls12381Pairing(cPoint, deltaPoint) + + // Check equality. + t1 := crypto.Bls12381Add(rt1, rt2) + t2 := crypto.Bls12381Add(t1, rt3) + + return util.Equals(lt, t2) +} +` + + // verifyCfg is a contract configuration file required to compile smart + // contract. + verifyCfg = `name: "Groth-16 Verifier contract" +sourceurl: https://github.com/nspcc-dev/neo-go/ +supportedstandards: []` + + // verifyGomod is a standard go.mod file containing module name, go version + // and dependency packages version needed for smart contract compilation. + verifyGomod = `module verify + +go 1.18 + +require github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20230606150208-a2daad6ba614 +` + + // verifyGosum is a standard go.sum file needed for contract compilation. + verifyGosum = `github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20230606150208-a2daad6ba614 h1:MiDBj73HNgPUbJRpXWLXrsGvX4rkYVDrdSmfOwivGR8= +github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20230606150208-a2daad6ba614/go.mod h1:ZUuXOkdtHZgaC13za/zMgXfQFncZ0jLzfQTe+OsDOtg= +` +) + +// verifyingKeyConstantPartLen is the length of the constant-len part of a +// serialized compressed verifying key. It is used to check that serialization +// format of a verifying key is expected. +const verifyingKeyConstantPartLen = bls12381.SizeOfG1AffineCompressed + bls12381.SizeOfG1AffineCompressed + // [α]1,[β]1 + bls12381.SizeOfG2AffineCompressed + bls12381.SizeOfG2AffineCompressed + // [β]2,[γ]2 + bls12381.SizeOfG1AffineCompressed + bls12381.SizeOfG2AffineCompressed + // [δ]1,[δ]2 + 4 // len(Kvk) in BE (a number of public wires for this circuit) + +// VerifyProofArgs is the set of arguments of `verifyProof` method of a +// Verifier contract in serialized form (as the contract accepts them). +type VerifyProofArgs struct { + A []byte + B []byte + C []byte + PublicWitnesses []any +} + +// tmplParams is a set of parameters used by verification contract template. +type tmplParams struct { + Alpha []byte + Beta []byte + Gamma []byte + Delta []byte + ICs [][]byte +} + +// GenerateVerifier generates a Verifier smart contract written in Go for Neo +// blockchain. The contract contains a single `verifyProof` method that accepts +// a proof represented as three BLS12-381 curve points and public witnesses +// required for verification represented as a list of serialized 32-bytes field +// elements in the LE form. The boolean result of `verifyProof` is either `true` +// (if the proof is valid) or `false` (if the proof is invalid). The smart +// contract generated from this template can be immediately compiled without +// any additional changes using NeoGo compiler, deployed to the Neo chain and +// invoked. The verification contract is circuit-specific, i.e. corresponds to +// a specific constraint system. Thus, every new circuit requires its own +// verification contract to be generated and deployed to the chain. +// +// GenerateVerifier also generates a proper contract YAML configuration file, +// go.mod and go.sum files if the corresponding writers are provided via cfg. +func GenerateVerifier(cfg Config) error { + if cfg.VerifyingKey == nil { + return fmt.Errorf("nil verifying key") + } + if cfg.VerifyingKey.CurveID() != ecc.BLS12_381 { + return fmt.Errorf("unexpected elliptic curve: %s", cfg.VerifyingKey.CurveID()) + } + + // Fetch the contract's public verification parameters. We can't directly access + // the VerifyingKey elements, because it's hidden under internal package, thus, + // take these parameters from the serialized VerifyingKey representation. It + // follows the bellman format: + // https://github.com/zkcrypto/bellman/blob/fa9be45588227a8c6ec34957de3f68705f07bd92/src/groth16/mod.rs#L143 + // [α]1,[β]1,[β]2,[γ]2,[δ]1,[δ]2,uint32(len(Kvk)),[Kvk]1 + // See also the serialisation code: https://github.com/Consensys/gnark/blob/165b49ab88d69c97867a76e147e6fd41af138210/internal/backend/bls12-381/groth16/marshal.go#L95 + var buf bytes.Buffer + _, err := cfg.VerifyingKey.WriteTo(&buf) + if err != nil { + return fmt.Errorf("failed to serialize verifying key: %w", err) + } + vkBytes := slice.Copy(buf.Bytes()) + + // Ensure the serialized verifier key has the expected length/format (just in case). + if len(vkBytes) < verifyingKeyConstantPartLen { + return errors.New("unexpected len of constant-size part of serialized verifying key") + } + kvkLen := binary.BigEndian.Uint32(vkBytes[verifyingKeyConstantPartLen-4:]) + if len(vkBytes) != verifyingKeyConstantPartLen+int(kvkLen*bls12381.SizeOfG1AffineCompressed) { + return errors.New("unexpected len of serialized verifying key") + } + + var ( + alphaG1Offset = 0 + betaG2Offset = bls12381.SizeOfG1AffineCompressed + bls12381.SizeOfG1AffineCompressed // [α]1,[β]1 + gammaG2Offset = bls12381.SizeOfG1AffineCompressed + bls12381.SizeOfG1AffineCompressed + // [α]1,[β]1 + bls12381.SizeOfG2AffineCompressed // [β]2 + deltaG2Offset = bls12381.SizeOfG1AffineCompressed + bls12381.SizeOfG1AffineCompressed + // [α]1,[β]1 + bls12381.SizeOfG2AffineCompressed + bls12381.SizeOfG2AffineCompressed + // [β]2,[γ]2 + bls12381.SizeOfG1AffineCompressed // [δ]1 + kvkLenOffset = bls12381.SizeOfG1AffineCompressed + bls12381.SizeOfG1AffineCompressed + // [α]1,[β]1 + bls12381.SizeOfG2AffineCompressed + bls12381.SizeOfG2AffineCompressed + // [β]2,[γ]2 + bls12381.SizeOfG1AffineCompressed + bls12381.SizeOfG2AffineCompressed // [δ]1,[δ]2 + kvkStartOffset = kvkLenOffset + 4 + ) + alphaG1 := vkBytes[alphaG1Offset : alphaG1Offset+bls12381.SizeOfG1AffineCompressed] + betaG2 := vkBytes[betaG2Offset : betaG2Offset+bls12381.SizeOfG2AffineCompressed] + gammaG2 := vkBytes[gammaG2Offset : gammaG2Offset+bls12381.SizeOfG2AffineCompressed] + deltaG2 := vkBytes[deltaG2Offset : deltaG2Offset+bls12381.SizeOfG2AffineCompressed] + kvks := make([][]byte, kvkLen) + for i := range kvks { + start := kvkStartOffset + i*bls12381.SizeOfG1AffineCompressed + end := start + bls12381.SizeOfG1AffineCompressed + kvks[i] = vkBytes[start:end] + } + + // Generate verification contract from the template using the retrieved + // verification parameters. + tmpl := template.Must(template.New("generate").Funcs(template.FuncMap{ + "byteSliceToStr": byteSliceToStr, + }).Parse(goVerificationTmpl)) + + err = tmpl.Execute(cfg.Output, tmplParams{ + Alpha: alphaG1, + Beta: betaG2, + Gamma: gammaG2, + Delta: deltaG2, + ICs: kvks, + }) + if err != nil { + return fmt.Errorf("failed to generate template: %w", err) + } + + if cfg.CfgOutput != nil { + _, err = cfg.CfgOutput.Write([]byte(verifyCfg)) + if err != nil { + return fmt.Errorf("failed to generate contract configuration file: %w", err) + } + } + if cfg.GomodOutput != nil { + _, err = cfg.GomodOutput.Write([]byte(verifyGomod)) + if err != nil { + return fmt.Errorf("failed to generate go.mod file: %w", err) + } + } + if cfg.GosumOutput != nil { + _, err = cfg.GosumOutput.Write([]byte(verifyGosum)) + if err != nil { + return fmt.Errorf("failed to generate go.mod file: %w", err) + } + } + + return nil +} + +// byteSliceToStr is a codegen helper that converts byte slice to a go-like slice. +func byteSliceToStr(s []byte) string { + var res string + for _, b := range s { + res += fmt.Sprintf("%d, ", b) + } + return `{` + res[:len(res)-2] + `}` +} + +// GetVerifyProofArgs returns a serialized set of arguments `verifyProof` method +// of a generated Verifier contract accepts. The set of arguments may be directly +// used as parameters to contract invocation. +func GetVerifyProofArgs(proof groth16.Proof, publicWitness witness.Witness) (*VerifyProofArgs, error) { + if proof == nil { + return nil, errors.New("nil proof") + } + if proof.CurveID() != ecc.BLS12_381 { + return nil, fmt.Errorf("unexpected elliptic curve: %s", proof.CurveID()) + } + // If a full witness was provided, then retrieve public part, we don't need the secret part of it. + publicWitness, err := publicWitness.Public() + if err != nil { + return nil, fmt.Errorf("failed to retrieve public witness: %w", err) + } + // Get the proof bytes (points are in the compressed form, as Verification contract accepts it). + proofSizeCompressed := int64(bls12381.SizeOfG1AffineCompressed + bls12381.SizeOfG2AffineCompressed + bls12381.SizeOfG1AffineCompressed) + var buf bytes.Buffer + n, err := proof.WriteTo(&buf) + if err != nil { + return nil, fmt.Errorf("failed to serialize proof: %w", err) + } + if n != proofSizeCompressed { + return nil, fmt.Errorf("unexpected serialized proof length: %d", n) + } + proofBytes := slice.Copy(buf.Bytes()) + + aBytes := proofBytes[:bls12381.SizeOfG1AffineCompressed] + bBytes := proofBytes[bls12381.SizeOfG1AffineCompressed : bls12381.SizeOfG1AffineCompressed+bls12381.SizeOfG2AffineCompressed] + cBytes := proofBytes[bls12381.SizeOfG1AffineCompressed+bls12381.SizeOfG2AffineCompressed:] + + publicWitnessBytes, err := publicWitness.MarshalBinary() + if err != nil { + return nil, fmt.Errorf("failed to encode public witness: %w", err) + } + numPublicWitness := binary.BigEndian.Uint32(publicWitnessBytes[:4]) + numSecretWitness := binary.BigEndian.Uint32(publicWitnessBytes[4:8]) + numVectorElements := binary.BigEndian.Uint32(publicWitnessBytes[8:12]) + + // Ensure that serialization format is as expected (just in case). + if numSecretWitness != 0 { + return nil, fmt.Errorf("unexpected number of secret witnesses: %d", numSecretWitness) + } + if numPublicWitness+numSecretWitness != numVectorElements { + return nil, fmt.Errorf("unexpected number of public witness elements: %d", numVectorElements) + } + + // Create public witness input. + input := make([]any, numVectorElements) + offset := 12 + for i := range input { // firstly - public witnesses, after that - private ones (but they are missing from publicWitness anyway). + start := offset + i*fr.Bytes + end := start + fr.Bytes + slice.Reverse(publicWitnessBytes[start:end]) // gnark stores witnesses in the BE form, but native CryptoLib accepts LE-encoded fields elements (not a canonical form). + input[i] = publicWitnessBytes[start:end] + } + return &VerifyProofArgs{ + A: aBytes, + B: bBytes, + C: cBytes, + PublicWitnesses: input, + }, nil +}