ceremonyclient/node/crypto/wesolowski_frame_prover.go

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2024-02-13 07:04:56 +00:00
package crypto
import (
"bytes"
"crypto"
"crypto/rand"
"encoding/binary"
"math/big"
"github.com/cloudflare/circl/sign/ed448"
"github.com/iden3/go-iden3-crypto/poseidon"
"github.com/pkg/errors"
"go.uber.org/zap"
"golang.org/x/crypto/sha3"
"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/vdf"
"source.quilibrium.com/quilibrium/monorepo/node/keys"
"source.quilibrium.com/quilibrium/monorepo/node/protobufs"
"source.quilibrium.com/quilibrium/monorepo/node/tries"
)
type WesolowskiFrameProver struct {
logger *zap.Logger
}
func NewWesolowskiFrameProver(logger *zap.Logger) *WesolowskiFrameProver {
return &WesolowskiFrameProver{
logger,
}
}
func (w *WesolowskiFrameProver) ProveMasterClockFrame(
previousFrame *protobufs.ClockFrame,
timestamp int64,
difficulty uint32,
) (*protobufs.ClockFrame, error) {
input := []byte{}
input = append(input, previousFrame.Filter...)
input = binary.BigEndian.AppendUint64(input, previousFrame.FrameNumber+1)
input = binary.BigEndian.AppendUint32(input, difficulty)
input = append(input, previousFrame.Output[:]...)
b := sha3.Sum256(input)
v := vdf.New(difficulty, b)
v.Execute()
o := v.GetOutput()
previousSelectorBytes := [516]byte{}
copy(previousSelectorBytes[:], previousFrame.Output[:516])
parent, err := poseidon.HashBytes(previousSelectorBytes[:])
if err != nil {
return nil, errors.Wrap(err, "prove clock frame")
}
frame := &protobufs.ClockFrame{
Filter: previousFrame.Filter,
FrameNumber: previousFrame.FrameNumber + 1,
Timestamp: timestamp,
Difficulty: difficulty,
ParentSelector: parent.FillBytes(make([]byte, 32)),
Input: previousFrame.Output,
AggregateProofs: []*protobufs.InclusionAggregateProof{},
Output: o[:],
}
return frame, nil
}
func (w *WesolowskiFrameProver) VerifyMasterClockFrame(
frame *protobufs.ClockFrame,
) error {
input := []byte{}
input = append(input, frame.Filter...)
input = binary.BigEndian.AppendUint64(input, frame.FrameNumber)
input = binary.BigEndian.AppendUint32(input, frame.Difficulty)
input = append(input, frame.Input...)
if len(frame.Input) < 516 {
return errors.Wrap(
errors.New("invalid input"),
"verify clock frame",
)
}
if len(frame.AggregateProofs) > 0 {
return errors.Wrap(
errors.New("invalid input"),
"verify clock frame",
)
}
if frame.PublicKeySignature != nil {
return errors.Wrap(
errors.New("invalid input"),
"verify clock frame",
)
}
if len(frame.Input) != 516 {
return errors.Wrap(
errors.New("invalid input"),
"verify clock frame",
)
}
b := sha3.Sum256(input)
v := vdf.New(frame.Difficulty, b)
proof := [516]byte{}
copy(proof[:], frame.Output)
if !v.Verify(proof) {
w.logger.Error("invalid proof",
zap.Binary("filter", frame.Filter),
zap.Uint64("frame_number", frame.FrameNumber),
zap.Uint32("difficulty", frame.Difficulty),
zap.Binary("frame_input", frame.Input),
zap.Binary("frame_output", frame.Output),
)
return errors.Wrap(
errors.New("invalid proof"),
"verify clock frame",
)
}
previousSelectorBytes := [516]byte{}
copy(previousSelectorBytes[:], frame.Input[:516])
parent, err := poseidon.HashBytes(previousSelectorBytes[:])
if err != nil {
return errors.Wrap(err, "verify clock frame")
}
selector := new(big.Int).SetBytes(frame.ParentSelector)
if parent.Cmp(selector) != 0 {
return errors.Wrap(
errors.New("selector did not match input"),
"verify clock frame",
)
}
return nil
}
func (w *WesolowskiFrameProver) CreateMasterGenesisFrame(
filter []byte,
seed []byte,
difficulty uint32,
) (
*protobufs.ClockFrame,
error,
) {
b := sha3.Sum256(seed)
v := vdf.New(difficulty, b)
v.Execute()
o := v.GetOutput()
inputMessage := o[:]
w.logger.Debug("proving genesis frame")
input := []byte{}
input = append(input, filter...)
input = binary.BigEndian.AppendUint64(input, 0)
input = binary.BigEndian.AppendUint32(input, difficulty)
if bytes.Equal(seed, []byte{0x00}) {
value := [516]byte{}
input = append(input, value[:]...)
} else {
input = append(input, seed...)
}
b = sha3.Sum256(input)
v = vdf.New(difficulty, b)
v.Execute()
o = v.GetOutput()
frame := &protobufs.ClockFrame{
Filter: filter,
FrameNumber: 0,
Timestamp: 0,
Difficulty: difficulty,
Input: inputMessage,
Output: o[:],
ParentSelector: []byte{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
AggregateProofs: []*protobufs.InclusionAggregateProof{},
PublicKeySignature: nil,
}
return frame, nil
}
func (w *WesolowskiFrameProver) ProveDataClockFrame(
previousFrame *protobufs.ClockFrame,
commitments [][]byte,
aggregateProofs []*protobufs.InclusionAggregateProof,
provingKey crypto.Signer,
timestamp int64,
difficulty uint32,
) (*protobufs.ClockFrame, error) {
var pubkey []byte
pubkeyType := keys.KeyTypeEd448
ed448PublicKey, ok := provingKey.Public().(ed448.PublicKey)
if ok {
pubkey = []byte(ed448PublicKey)
} else {
return nil, errors.Wrap(
errors.New("no valid signature provided"),
"prove clock frame",
)
}
h, err := poseidon.HashBytes(pubkey)
if err != nil {
return nil, errors.Wrap(
errors.New("could not hash proving key"),
"prove clock frame",
)
}
address := h.Bytes()
input := []byte{}
input = append(input, previousFrame.Filter...)
input = binary.BigEndian.AppendUint64(input, previousFrame.FrameNumber+1)
input = binary.BigEndian.AppendUint64(input, uint64(timestamp))
input = binary.BigEndian.AppendUint32(input, difficulty)
input = append(input, address...)
input = append(input, previousFrame.Output[:]...)
commitmentInput := []byte{}
for _, commitment := range commitments {
commitmentInput = append(commitmentInput, commitment...)
}
input = append(input, commitmentInput...)
b := sha3.Sum256(input)
v := vdf.New(difficulty, b)
v.Execute()
o := v.GetOutput()
// TODO: make this configurable for signing algorithms that allow
// user-supplied hash functions
signature, err := provingKey.Sign(
rand.Reader,
append(append([]byte{}, b[:]...), o[:]...),
crypto.Hash(0),
)
if err != nil {
return nil, errors.Wrap(
err,
"prove",
)
}
previousSelectorBytes := [516]byte{}
copy(previousSelectorBytes[:], previousFrame.Output[:516])
parent, err := poseidon.HashBytes(previousSelectorBytes[:])
if err != nil {
return nil, errors.Wrap(err, "prove clock frame")
}
frame := &protobufs.ClockFrame{
Filter: previousFrame.Filter,
FrameNumber: previousFrame.FrameNumber + 1,
Timestamp: timestamp,
Difficulty: difficulty,
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ParentSelector: parent.FillBytes(make([]byte, 32)),
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Input: append(
append([]byte{}, previousFrame.Output...),
commitmentInput...,
),
AggregateProofs: aggregateProofs,
Output: o[:],
}
switch pubkeyType {
case keys.KeyTypeEd448:
frame.PublicKeySignature = &protobufs.ClockFrame_PublicKeySignatureEd448{
PublicKeySignatureEd448: &protobufs.Ed448Signature{
Signature: signature,
PublicKey: &protobufs.Ed448PublicKey{
KeyValue: pubkey,
},
},
}
default:
return nil, errors.Wrap(
errors.New("unsupported proving key"),
"prove clock frame",
)
}
return frame, nil
}
func (w *WesolowskiFrameProver) CreateDataGenesisFrame(
filter []byte,
origin []byte,
difficulty uint32,
inclusionProof *InclusionAggregateProof,
proverKeys [][]byte,
preDusk bool,
) (*protobufs.ClockFrame, *tries.RollingFrecencyCritbitTrie, error) {
frameProverTrie := &tries.RollingFrecencyCritbitTrie{}
for _, s := range proverKeys {
addr, err := poseidon.HashBytes(s)
if err != nil {
panic(err)
}
addrBytes := addr.Bytes()
addrBytes = append(make([]byte, 32-len(addrBytes)), addrBytes...)
frameProverTrie.Add(addrBytes, 0)
}
w.logger.Info("proving genesis frame")
input := []byte{}
input = append(input, filter...)
input = binary.BigEndian.AppendUint64(input, 0)
input = binary.BigEndian.AppendUint64(input, 0)
input = binary.BigEndian.AppendUint32(input, difficulty)
input = append(input, origin...)
if !preDusk {
input = append(input, inclusionProof.AggregateCommitment...)
}
b := sha3.Sum256(input)
v := vdf.New(difficulty, b)
v.Execute()
o := v.GetOutput()
commitments := []*protobufs.InclusionCommitment{}
for i, commit := range inclusionProof.InclusionCommitments {
commitments = append(commitments, &protobufs.InclusionCommitment{
Filter: filter,
FrameNumber: 0,
Position: uint32(i),
TypeUrl: commit.TypeUrl,
Data: commit.Data,
Commitment: commit.Commitment,
})
}
frame := &protobufs.ClockFrame{
Filter: filter,
FrameNumber: 0,
Timestamp: 0,
Difficulty: difficulty,
Input: append(
append([]byte{}, origin...),
inclusionProof.AggregateCommitment...,
),
Output: o[:],
ParentSelector: []byte{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
AggregateProofs: []*protobufs.InclusionAggregateProof{
{
Filter: filter,
FrameNumber: 0,
InclusionCommitments: commitments,
Proof: inclusionProof.Proof,
},
},
PublicKeySignature: nil,
}
return frame, frameProverTrie, nil
}
func (w *WesolowskiFrameProver) VerifyDataClockFrame(
frame *protobufs.ClockFrame,
) error {
var pubkey []byte
var signature []byte
pubkeyType := keys.KeyTypeEd448
ed448PublicKey := frame.GetPublicKeySignatureEd448()
if ed448PublicKey != nil {
pubkey = ed448PublicKey.PublicKey.KeyValue
signature = ed448PublicKey.Signature
} else {
return errors.Wrap(
errors.New("no valid signature provided"),
"verify clock frame",
)
}
h, err := poseidon.HashBytes(pubkey)
if err != nil {
return errors.Wrap(
errors.New("could not hash proving key"),
"verify clock frame",
)
}
address := h.Bytes()
input := []byte{}
input = append(input, frame.Filter...)
input = binary.BigEndian.AppendUint64(input, frame.FrameNumber)
input = binary.BigEndian.AppendUint64(input, uint64(frame.Timestamp))
input = binary.BigEndian.AppendUint32(input, frame.Difficulty)
input = append(input, address...)
input = append(input, frame.Input...)
if len(frame.Input) < 516 {
return errors.Wrap(
errors.New("invalid input"),
"verify clock frame",
)
}
b := sha3.Sum256(input)
v := vdf.New(frame.Difficulty, b)
proof := [516]byte{}
copy(proof[:], frame.Output)
// TODO: make this configurable for signing algorithms that allow
// user-supplied hash functions
switch pubkeyType {
case keys.KeyTypeEd448:
if len(pubkey) != 57 || len(signature) != 114 || !ed448.VerifyAny(
pubkey,
append(append([]byte{}, b[:]...), frame.Output...),
signature,
crypto.Hash(0),
) {
return errors.Wrap(
errors.New("invalid signature for issuer"),
"verify clock frame",
)
}
}
if !v.Verify(proof) {
return errors.Wrap(
errors.New("invalid proof"),
"verify clock frame",
)
}
previousSelectorBytes := [516]byte{}
copy(previousSelectorBytes[:], frame.Input[:516])
parent, err := poseidon.HashBytes(previousSelectorBytes[:])
if err != nil {
return errors.Wrap(err, "verify clock frame")
}
selector := new(big.Int).SetBytes(frame.ParentSelector)
if parent.Cmp(selector) != 0 {
return errors.Wrap(
errors.New("selector did not match input"),
"verify clock frame",
)
}
return nil
}