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zkp: add end-to-end Groth-16 proof generation/verification example

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The example shows that the proover knows the solution of the cubic
equation: y = x^3 + x + 5. The example is constructed for BLS12-381
curve points using Groth-16 prooving algorithm. 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. Go verification contract generation and deployment with the help of
   NeoGo libraries.
4. The on-chain proof verification for various sets of input data.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
This commit is contained in:
Anna Shaleva 2023-07-29 14:03:50 +03:00
parent 0a3260c22c
commit 9e74fc5b47
9 changed files with 1405 additions and 21 deletions
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27
examples/README.md
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@ -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

67
examples/zkp/cubic_circuit/go.mod Normal file
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@ -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 => ../../../

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examples/zkp/cubic_circuit/go.sum Normal file
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@ -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 h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20221202181307-76fa05c21b12 h1:npHgfD4Tl2WJS3AJaMUi5ynGDPUBfkg3U3fCzDyXZ+4=
github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
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/bits-and-blooms/bitset v1.7.0 h1:YjAGVd3XmtK9ktAbX8Zg2g2PwLIMjGREZJHlV4j7NEo=
github.com/bits-and-blooms/bitset v1.7.0/go.mod h1:gIdJ4wp64HaoK2YrL1Q5/N7Y16edYb8uY+O0FJTyyDA=
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 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE=
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/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
github.com/chzyer/readline v1.5.0 h1:lSwwFrbNviGePhkewF1az4oLmcwqCZijQ2/Wi3BGHAI=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/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 v0.8.0 h1:0bQ2MyDG4oNjMQpNyL8HjrrUSSL3yYJg0Elzo6LzmcU=
github.com/consensys/gnark v0.8.0/go.mod h1:aKmA7dIiLbTm0OV37xTq0z+Bpe4xER8EhRLi6necrm8=
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/consensys/gnark-crypto v0.11.2 h1:GJjjtWJ+db1xGao7vTsOgAOGgjfPe7eRGPL+xxMX0qE=
github.com/consensys/gnark-crypto v0.11.2/go.mod h1:v2Gy7L/4ZRosZ7Ivs+9SfUDr0f5UlG+EM5t7MPHiLuY=
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=
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github.com/holiman/uint256 v1.2.0/go.mod h1:y4ga/t+u+Xwd7CpDgZESaRcWy0I7XMlTMA25ApIH5Jw=
github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
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github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
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github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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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=
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github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
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golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
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golang.org/x/crypto v0.6.0/go.mod h1:OFC/31mSvZgRz0V1QTNCzfAI1aIRzbiufJtkMIlEp58=
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93
examples/zkp/cubic_circuit/main.go Normal file
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@ -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.
}

142
examples/zkp/cubic_circuit/main_test.go Normal file
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@ -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)
}

6
examples/zkp/xor_compat/verify.go
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@ -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 (

12
go.mod
View file

@ -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

37
go.sum
View file

@ -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=

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pkg/smartcontract/zkpbinding/binding.go Normal file
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// 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
}