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marshal.go
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marshal.go
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// Copyright 2020 ConsenSys Software Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Code generated by gnark DO NOT EDIT
package groth16
import (
curve "github.com/consensys/gnark-crypto/ecc/bls12-377"
"github.com/consensys/gnark-crypto/ecc/bls12-377/fr/pedersen"
"github.com/consensys/gnark-crypto/utils/unsafe"
"github.com/consensys/gnark/internal/utils"
"io"
)
// WriteTo writes binary encoding of the Proof elements to writer
// points are stored in compressed form Ar | Krs | Bs
// use WriteRawTo(...) to encode the proof without point compression
func (proof *Proof) WriteTo(w io.Writer) (n int64, err error) {
return proof.writeTo(w, false)
}
// WriteRawTo writes binary encoding of the Proof elements to writer
// points are stored in uncompressed form Ar | Krs | Bs
// use WriteTo(...) to encode the proof with point compression
func (proof *Proof) WriteRawTo(w io.Writer) (n int64, err error) {
return proof.writeTo(w, true)
}
func (proof *Proof) writeTo(w io.Writer, raw bool) (int64, error) {
var enc *curve.Encoder
if raw {
enc = curve.NewEncoder(w, curve.RawEncoding())
} else {
enc = curve.NewEncoder(w)
}
if err := enc.Encode(&proof.Ar); err != nil {
return enc.BytesWritten(), err
}
if err := enc.Encode(&proof.Bs); err != nil {
return enc.BytesWritten(), err
}
if err := enc.Encode(&proof.Krs); err != nil {
return enc.BytesWritten(), err
}
if err := enc.Encode(proof.Commitments); err != nil {
return enc.BytesWritten(), err
}
if err := enc.Encode(&proof.CommitmentPok); err != nil {
return enc.BytesWritten(), err
}
return enc.BytesWritten(), nil
}
// ReadFrom attempts to decode a Proof from reader
// Proof must be encoded through WriteTo (compressed) or WriteRawTo (uncompressed)
func (proof *Proof) ReadFrom(r io.Reader) (n int64, err error) {
dec := curve.NewDecoder(r)
if err := dec.Decode(&proof.Ar); err != nil {
return dec.BytesRead(), err
}
if err := dec.Decode(&proof.Bs); err != nil {
return dec.BytesRead(), err
}
if err := dec.Decode(&proof.Krs); err != nil {
return dec.BytesRead(), err
}
if err := dec.Decode(&proof.Commitments); err != nil {
return dec.BytesRead(), err
}
if err := dec.Decode(&proof.CommitmentPok); err != nil {
return dec.BytesRead(), err
}
return dec.BytesRead(), nil
}
// WriteTo writes binary encoding of the key elements to writer
// points are compressed
// use WriteRawTo(...) to encode the key without point compression
func (vk *VerifyingKey) WriteTo(w io.Writer) (n int64, err error) {
if n, err = vk.writeTo(w, false); err != nil {
return n, err
}
var m int64
m, err = vk.CommitmentKey.WriteTo(w)
return m + n, err
}
// WriteRawTo writes binary encoding of the key elements to writer
// points are not compressed
// use WriteTo(...) to encode the key with point compression
func (vk *VerifyingKey) WriteRawTo(w io.Writer) (n int64, err error) {
if n, err = vk.writeTo(w, true); err != nil {
return n, err
}
var m int64
m, err = vk.CommitmentKey.WriteRawTo(w)
return m + n, err
}
// writeTo serialization format:
// follows 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
func (vk *VerifyingKey) writeTo(w io.Writer, raw bool) (int64, error) {
var enc *curve.Encoder
if raw {
enc = curve.NewEncoder(w, curve.RawEncoding())
} else {
enc = curve.NewEncoder(w)
}
// [α]1,[β]1,[β]2,[γ]2,[δ]1,[δ]2
if err := enc.Encode(&vk.G1.Alpha); err != nil {
return enc.BytesWritten(), err
}
if err := enc.Encode(&vk.G1.Beta); err != nil {
return enc.BytesWritten(), err
}
if err := enc.Encode(&vk.G2.Beta); err != nil {
return enc.BytesWritten(), err
}
if err := enc.Encode(&vk.G2.Gamma); err != nil {
return enc.BytesWritten(), err
}
if err := enc.Encode(&vk.G1.Delta); err != nil {
return enc.BytesWritten(), err
}
if err := enc.Encode(&vk.G2.Delta); err != nil {
return enc.BytesWritten(), err
}
// uint32(len(Kvk)),[Kvk]1
if err := enc.Encode(vk.G1.K); err != nil {
return enc.BytesWritten(), err
}
if vk.PublicAndCommitmentCommitted == nil {
vk.PublicAndCommitmentCommitted = [][]int{} // only matters in tests
}
if err := enc.Encode(utils.IntSliceSliceToUint64SliceSlice(vk.PublicAndCommitmentCommitted)); err != nil {
return enc.BytesWritten(), err
}
return enc.BytesWritten(), nil
}
// ReadFrom attempts to decode a VerifyingKey from reader
// VerifyingKey must be encoded through WriteTo (compressed) or WriteRawTo (uncompressed)
// serialization 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
func (vk *VerifyingKey) ReadFrom(r io.Reader) (int64, error) {
n, err := vk.readFrom(r)
if err != nil {
return n, err
}
var m int64
m, err = vk.CommitmentKey.ReadFrom(r)
return m + n, err
}
// UnsafeReadFrom has the same behavior as ReadFrom, except that it will not check that decode points
// are on the curve and in the correct subgroup.
func (vk *VerifyingKey) UnsafeReadFrom(r io.Reader) (int64, error) {
n, err := vk.readFrom(r, curve.NoSubgroupChecks())
if err != nil {
return n, err
}
var m int64
m, err = vk.CommitmentKey.UnsafeReadFrom(r)
return m + n, err
}
func (vk *VerifyingKey) readFrom(r io.Reader, decOptions ...func(*curve.Decoder)) (int64, error) {
dec := curve.NewDecoder(r, decOptions...)
// [α]1,[β]1,[β]2,[γ]2,[δ]1,[δ]2
if err := dec.Decode(&vk.G1.Alpha); err != nil {
return dec.BytesRead(), err
}
if err := dec.Decode(&vk.G1.Beta); err != nil {
return dec.BytesRead(), err
}
if err := dec.Decode(&vk.G2.Beta); err != nil {
return dec.BytesRead(), err
}
if err := dec.Decode(&vk.G2.Gamma); err != nil {
return dec.BytesRead(), err
}
if err := dec.Decode(&vk.G1.Delta); err != nil {
return dec.BytesRead(), err
}
if err := dec.Decode(&vk.G2.Delta); err != nil {
return dec.BytesRead(), err
}
// uint32(len(Kvk)),[Kvk]1
if err := dec.Decode(&vk.G1.K); err != nil {
return dec.BytesRead(), err
}
var publicCommitted [][]uint64
if err := dec.Decode(&publicCommitted); err != nil {
return dec.BytesRead(), err
}
vk.PublicAndCommitmentCommitted = utils.Uint64SliceSliceToIntSliceSlice(publicCommitted)
// recompute vk.e (e(α, β)) and -[δ]2, -[γ]2
if err := vk.Precompute(); err != nil {
return dec.BytesRead(), err
}
return dec.BytesRead(), nil
}
// WriteTo writes binary encoding of the key elements to writer
// points are compressed
// use WriteRawTo(...) to encode the key without point compression
func (pk *ProvingKey) WriteTo(w io.Writer) (n int64, err error) {
return pk.writeTo(w, false)
}
// WriteRawTo writes binary encoding of the key elements to writer
// points are not compressed
// use WriteTo(...) to encode the key with point compression
func (pk *ProvingKey) WriteRawTo(w io.Writer) (n int64, err error) {
return pk.writeTo(w, true)
}
func (pk *ProvingKey) writeTo(w io.Writer, raw bool) (int64, error) {
n, err := pk.Domain.WriteTo(w)
if err != nil {
return n, err
}
var enc *curve.Encoder
if raw {
enc = curve.NewEncoder(w, curve.RawEncoding())
} else {
enc = curve.NewEncoder(w)
}
nbWires := uint64(len(pk.InfinityA))
toEncode := []interface{}{
&pk.G1.Alpha,
&pk.G1.Beta,
&pk.G1.Delta,
pk.G1.A,
pk.G1.B,
pk.G1.Z,
pk.G1.K,
&pk.G2.Beta,
&pk.G2.Delta,
pk.G2.B,
nbWires,
pk.NbInfinityA,
pk.NbInfinityB,
pk.InfinityA,
pk.InfinityB,
uint32(len(pk.CommitmentKeys)),
}
for _, v := range toEncode {
if err := enc.Encode(v); err != nil {
return n + enc.BytesWritten(), err
}
}
for i := range pk.CommitmentKeys {
var (
n2 int64
err error
)
if raw {
n2, err = pk.CommitmentKeys[i].WriteRawTo(w)
} else {
n2, err = pk.CommitmentKeys[i].WriteTo(w)
}
n += n2
if err != nil {
return n, err
}
}
return n + enc.BytesWritten(), nil
}
// ReadFrom attempts to decode a ProvingKey from reader
// ProvingKey must be encoded through WriteTo (compressed) or WriteRawTo (uncompressed)
// note that we don't check that the points are on the curve or in the correct subgroup at this point
func (pk *ProvingKey) ReadFrom(r io.Reader) (int64, error) {
return pk.readFrom(r)
}
// UnsafeReadFrom behaves like ReadFrom excepts it doesn't check if the decoded points are on the curve
// or in the correct subgroup
func (pk *ProvingKey) UnsafeReadFrom(r io.Reader) (int64, error) {
return pk.readFrom(r, curve.NoSubgroupChecks())
}
func (pk *ProvingKey) readFrom(r io.Reader, decOptions ...func(*curve.Decoder)) (int64, error) {
n, err := pk.Domain.ReadFrom(r)
if err != nil {
return n, err
}
dec := curve.NewDecoder(r, decOptions...)
var nbWires uint64
var nbCommitments uint32
toDecode := []interface{}{
&pk.G1.Alpha,
&pk.G1.Beta,
&pk.G1.Delta,
&pk.G1.A,
&pk.G1.B,
&pk.G1.Z,
&pk.G1.K,
&pk.G2.Beta,
&pk.G2.Delta,
&pk.G2.B,
&nbWires,
&pk.NbInfinityA,
&pk.NbInfinityB,
}
for _, v := range toDecode {
if err := dec.Decode(v); err != nil {
return n + dec.BytesRead(), err
}
}
pk.InfinityA = make([]bool, nbWires)
pk.InfinityB = make([]bool, nbWires)
if err := dec.Decode(&pk.InfinityA); err != nil {
return n + dec.BytesRead(), err
}
if err := dec.Decode(&pk.InfinityB); err != nil {
return n + dec.BytesRead(), err
}
if err := dec.Decode(&nbCommitments); err != nil {
return n + dec.BytesRead(), err
}
pk.CommitmentKeys = make([]pedersen.ProvingKey, nbCommitments)
for i := range pk.CommitmentKeys {
n2, err := pk.CommitmentKeys[i].ReadFrom(r)
n += n2
if err != nil {
return n, err
}
}
return n + dec.BytesRead(), nil
}
// WriteDump behaves like WriteRawTo, excepts, the slices of points are "dumped" using gnark-crypto/utils/unsafe
// Output is compatible with ReadDump, with the caveat that, not only the points are not checked for
// correctness, but the raw bytes are platform dependent (endianness, etc.)
func (pk *ProvingKey) WriteDump(w io.Writer) error {
// it behaves like WriteRawTo, excepts, the slices of points are "dumped" using gnark-crypto/utils/unsafe
// start by writing an unsafe marker to fail early.
if err := unsafe.WriteMarker(w); err != nil {
return err
}
if _, err := pk.Domain.WriteTo(w); err != nil {
return err
}
enc := curve.NewEncoder(w, curve.RawEncoding())
nbWires := uint64(len(pk.InfinityA))
toEncode := []interface{}{
&pk.G1.Alpha,
&pk.G1.Beta,
&pk.G1.Delta,
// pk.G1.A,
// pk.G1.B,
// pk.G1.Z,
// pk.G1.K,
&pk.G2.Beta,
&pk.G2.Delta,
// pk.G2.B,
nbWires,
pk.NbInfinityA,
pk.NbInfinityB,
pk.InfinityA,
pk.InfinityB,
uint32(len(pk.CommitmentKeys)),
}
for _, v := range toEncode {
if err := enc.Encode(v); err != nil {
return err
}
}
// dump slices of points
if err := unsafe.WriteSlice(w, pk.G1.A); err != nil {
return err
}
if err := unsafe.WriteSlice(w, pk.G1.B); err != nil {
return err
}
if err := unsafe.WriteSlice(w, pk.G1.Z); err != nil {
return err
}
if err := unsafe.WriteSlice(w, pk.G1.K); err != nil {
return err
}
if err := unsafe.WriteSlice(w, pk.G2.B); err != nil {
return err
}
for i := range pk.CommitmentKeys {
if err := unsafe.WriteSlice(w, pk.CommitmentKeys[i].Basis); err != nil {
return err
}
if err := unsafe.WriteSlice(w, pk.CommitmentKeys[i].BasisExpSigma); err != nil {
return err
}
}
return nil
}
// ReadDump reads a ProvingKey from a dump written by WriteDump.
// This is platform dependent and very unsafe (no checks, no endianness translation, etc.)
func (pk *ProvingKey) ReadDump(r io.Reader) error {
// read the marker to fail early in case of malformed input
if err := unsafe.ReadMarker(r); err != nil {
return err
}
if _, err := pk.Domain.ReadFrom(r); err != nil {
return err
}
dec := curve.NewDecoder(r, curve.NoSubgroupChecks())
var nbWires uint64
var nbCommitments uint32
toDecode := []interface{}{
&pk.G1.Alpha,
&pk.G1.Beta,
&pk.G1.Delta,
// &pk.G1.A,
// &pk.G1.B,
// &pk.G1.Z,
// &pk.G1.K,
&pk.G2.Beta,
&pk.G2.Delta,
// &pk.G2.B,
&nbWires,
&pk.NbInfinityA,
&pk.NbInfinityB,
}
for _, v := range toDecode {
if err := dec.Decode(v); err != nil {
return err
}
}
pk.InfinityA = make([]bool, nbWires)
pk.InfinityB = make([]bool, nbWires)
if err := dec.Decode(&pk.InfinityA); err != nil {
return err
}
if err := dec.Decode(&pk.InfinityB); err != nil {
return err
}
if err := dec.Decode(&nbCommitments); err != nil {
return err
}
// read slices of points
var err error
pk.G1.A, _, err = unsafe.ReadSlice[[]curve.G1Affine](r)
if err != nil {
return err
}
pk.G1.B, _, err = unsafe.ReadSlice[[]curve.G1Affine](r)
if err != nil {
return err
}
pk.G1.Z, _, err = unsafe.ReadSlice[[]curve.G1Affine](r)
if err != nil {
return err
}
pk.G1.K, _, err = unsafe.ReadSlice[[]curve.G1Affine](r)
if err != nil {
return err
}
pk.G2.B, _, err = unsafe.ReadSlice[[]curve.G2Affine](r)
if err != nil {
return err
}
pk.CommitmentKeys = make([]pedersen.ProvingKey, nbCommitments)
for i := range pk.CommitmentKeys {
pk.CommitmentKeys[i].Basis, _, err = unsafe.ReadSlice[[]curve.G1Affine](r)
if err != nil {
return err
}
pk.CommitmentKeys[i].BasisExpSigma, _, err = unsafe.ReadSlice[[]curve.G1Affine](r)
if err != nil {
return err
}
}
return nil
}