/
util.go
263 lines (226 loc) · 7.92 KB
/
util.go
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// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package wallet
import (
"bytes"
"encoding/hex"
"os"
"path/filepath"
"reflect"
"strconv"
"github.com/consensys/gnark-crypto/ecc"
"github.com/consensys/gnark/backend/groth16"
"github.com/consensys/gnark/backend/witness"
"github.com/consensys/gnark/frontend"
"github.com/pkg/errors"
"github.com/33cn/chain33/common"
"github.com/33cn/chain33/types"
mixTy "github.com/33cn/plugin/plugin/dapp/mix/types"
"github.com/consensys/gnark/backend"
"github.com/33cn/plugin/plugin/dapp/mix/executor/zksnark"
)
//产生随机秘钥和receivingPk对data DH加密,返回随机秘钥的公钥
func encryptSecretData(req *mixTy.EncryptSecretData) (*mixTy.DHSecret, error) {
secret, err := common.FromHex(req.Secret)
if err != nil {
return nil, errors.Wrap(err, "decode secret")
}
return encryptData(req.PeerSecretPubKey, secret)
}
func decryptSecretData(req *mixTy.DecryptSecretData) (*mixTy.SecretData, error) {
secret, err := common.FromHex(req.Secret)
if err != nil {
return nil, errors.Wrap(err, "decode req.secret")
}
decrypt, err := decryptData(req.SecretPriKey, req.OneTimePubKey, secret)
if err != nil {
return nil, errors.Wrap(err, "decrypt secret")
}
var raw mixTy.SecretData
err = types.Decode(decrypt, &raw)
if err != nil {
return nil, errors.Wrap(mixTy.ErrDecryptDataFail, "decode decrypt.secret")
}
return &raw, nil
}
func (p *mixPolicy) verifyProofOnChain(ty mixTy.VerifyType, proof *mixTy.ZkProofInfo, vkPath string, verifyOnChain bool) error {
//vkpath verify
if !verifyOnChain && len(vkPath) > 0 {
verifyKey, err := readZkKeyFile(vkPath)
if err != nil {
return errors.Wrapf(err, "getVerifyKey path=%s", vkPath)
}
pass, err := zksnark.Verify(verifyKey, proof.Proof, proof.PublicInput)
if err != nil || !pass {
return errors.Wrapf(err, "zk verify fail")
}
return nil
}
//线上验证proof,失败的原因有可能circuit,Pk和线上vk不匹配,或不是一起产生的版本
verify := &mixTy.VerifyProofInfo{
Ty: ty,
Proof: proof,
}
//onchain verify
_, err := p.walletOperate.GetAPI().Query(mixTy.MixX, "VerifyProof", verify)
return err
}
func (p *mixPolicy) getPaymentKey(addr string) (*mixTy.NoteAccountKey, error) {
msg, err := p.walletOperate.GetAPI().QueryChain(&types.ChainExecutor{
Driver: "mix",
FuncName: "PaymentPubKey",
Param: types.Encode(&types.ReqString{Data: addr}),
})
if err != nil {
return nil, err
}
return msg.(*mixTy.NoteAccountKey), err
}
func (p *mixPolicy) getPathProof(exec, symbol, leaf string) (*mixTy.CommitTreeProve, error) {
msg, err := p.walletOperate.GetAPI().QueryChain(&types.ChainExecutor{
Driver: "mix",
FuncName: "GetTreePath",
Param: types.Encode(&mixTy.TreeInfoReq{AssetExec: exec, AssetSymbol: symbol, LeafHash: leaf}),
})
if err != nil {
return nil, err
}
return msg.(*mixTy.CommitTreeProve), nil
}
func (p *mixPolicy) getNoteInfo(noteHash string) (*mixTy.WalletNoteInfo, error) {
if p.walletOperate.IsWalletLocked() {
return nil, types.ErrWalletIsLocked
}
var index mixTy.WalletMixIndexReq
index.NoteHash = noteHash
msg, err := p.listMixInfos(&index)
if err != nil {
return nil, errors.Wrapf(err, "list noteHash=%s", noteHash)
}
resp := msg.(*mixTy.WalletNoteResp)
if len(resp.Notes) < 1 {
return nil, errors.Wrapf(err, "list not found noteHash=%s", noteHash)
}
note := msg.(*mixTy.WalletNoteResp).Notes[0]
return note, nil
}
func (p *mixPolicy) getTreeProof(exec, symbol, leaf string) (*mixTy.TreePathProof, error) {
//get tree path
path, err := p.getPathProof(exec, symbol, leaf)
if err != nil {
return nil, errors.Wrapf(err, "get tree proof for noteHash=%s,exec=%s,symbol=%s", leaf, exec, symbol)
}
var proof mixTy.TreePathProof
proof.TreePath = path.ProofSet[1:]
proof.Helpers = path.Helpers
proof.TreeRootHash = path.RootHash
return &proof, nil
}
func getCircuit(circuitTy mixTy.VerifyType) (frontend.CompiledConstraintSystem, error) {
switch circuitTy {
case mixTy.VerifyType_DEPOSIT:
return frontend.Compile(ecc.BN254, backend.GROTH16, &mixTy.DepositCircuit{})
case mixTy.VerifyType_WITHDRAW:
return frontend.Compile(ecc.BN254, backend.GROTH16, &mixTy.WithdrawCircuit{})
case mixTy.VerifyType_TRANSFERINPUT:
return frontend.Compile(ecc.BN254, backend.GROTH16, &mixTy.TransferInputCircuit{})
case mixTy.VerifyType_TRANSFEROUTPUT:
return frontend.Compile(ecc.BN254, backend.GROTH16, &mixTy.TransferOutputCircuit{})
case mixTy.VerifyType_AUTHORIZE:
return frontend.Compile(ecc.BN254, backend.GROTH16, &mixTy.AuthorizeCircuit{})
default:
return nil, errors.Wrapf(types.ErrInvalidParam, "ty=%d", circuitTy)
}
}
func getCircuitKeyFileName(circuitTy mixTy.VerifyType) (string, string, error) {
switch circuitTy {
case mixTy.VerifyType_DEPOSIT:
return mixTy.DepositPk, mixTy.DepositVk, nil
case mixTy.VerifyType_WITHDRAW:
return mixTy.WithdrawPk, mixTy.WithdrawVk, nil
case mixTy.VerifyType_TRANSFERINPUT:
return mixTy.TransInputPk, mixTy.TransInputVk, nil
case mixTy.VerifyType_TRANSFEROUTPUT:
return mixTy.TransOutputPk, mixTy.TransOutputVk, nil
case mixTy.VerifyType_AUTHORIZE:
return mixTy.AuthPk, mixTy.AuthVk, nil
default:
return "", "", errors.Wrapf(types.ErrInvalidParam, "ty=%d", circuitTy)
}
}
//文件内容存储的是hex string,读的时候直接转换为string即可
func readZkKeyFile(path string) (string, error) {
f, err := os.Open(path)
if err != nil {
return "", errors.Wrapf(err, "open file=%s", path)
}
var buf bytes.Buffer
_, err = buf.ReadFrom(f)
if err != nil {
return "", errors.Wrapf(err, "read file=%s", path)
}
return buf.String(), nil
}
func createProof(circuit frontend.CompiledConstraintSystem, pk groth16.ProvingKey, witness frontend.Circuit) (groth16.Proof, error) {
return groth16.Prove(circuit, pk, witness)
}
func updateTreePath(obj interface{}, treeProof *mixTy.TreePathProof) {
tv := reflect.ValueOf(obj)
if tv.Kind() == reflect.Ptr {
tv = tv.Elem()
}
index := 0
for i, t := range treeProof.TreePath {
tv.FieldByName("Path" + strconv.Itoa(i)).Addr().Interface().(*frontend.Variable).Assign(t)
tv.FieldByName("Helper" + strconv.Itoa(i)).Addr().Interface().(*frontend.Variable).Assign(strconv.Itoa(int(treeProof.Helpers[i])))
tv.FieldByName("Valid" + strconv.Itoa(i)).Addr().Interface().(*frontend.Variable).Assign("1")
index = i + 1
}
//电路变量必须设置
for i := index; i < mixTy.TreeLevel; i++ {
tv.FieldByName("Path" + strconv.Itoa(i)).Addr().Interface().(*frontend.Variable).Assign("0")
tv.FieldByName("Helper" + strconv.Itoa(i)).Addr().Interface().(*frontend.Variable).Assign("0")
tv.FieldByName("Valid" + strconv.Itoa(i)).Addr().Interface().(*frontend.Variable).Assign("0")
}
}
func getZkProofKeys(circuitTy mixTy.VerifyType, path, file string, inputs frontend.Circuit) (*mixTy.ZkProofInfo, error) {
//从电路文件获取电路约束
circuit, err := getCircuit(circuitTy)
if err != nil {
return nil, err
}
//从pv 文件读取Pk结构
pkFile := filepath.Join(path, file)
pkStr, err := readZkKeyFile(pkFile)
if err != nil {
return nil, errors.Wrapf(err, "readZkKeyFile")
}
pkBuf, err := mixTy.GetByteBuff(pkStr)
if err != nil {
return nil, err
}
pk := groth16.NewProvingKey(ecc.BN254)
if _, err := pk.ReadFrom(pkBuf); err != nil {
return nil, errors.Wrapf(err, "read pk")
}
//产生zk 证明
proof, err := createProof(circuit, pk, inputs)
if err != nil {
return nil, errors.Wrapf(err, "create proof to %s", pkFile)
}
var proofKey bytes.Buffer
if _, err := proof.WriteTo(&proofKey); err != nil {
return nil, errors.Wrapf(err, "write proof")
}
//公开输入序列化
var pubBuf bytes.Buffer
_, err = witness.WritePublicTo(&pubBuf, ecc.BN254, inputs)
if err != nil {
return nil, errors.Wrapf(err, "write public input")
}
return &mixTy.ZkProofInfo{
Proof: hex.EncodeToString(proofKey.Bytes()),
PublicInput: hex.EncodeToString(pubBuf.Bytes()),
}, nil
}