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lcp.go
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lcp.go
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package types
import (
"bytes"
"fmt"
"math/big"
sdk "github.com/cosmos/cosmos-sdk/types"
clienttypes "github.com/cosmos/ibc-go/v4/modules/core/02-client/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
"github.com/ethereum/go-ethereum/rlp"
)
const (
QuoteOK = "OK"
QuoteSignatureInvalid = "SIGNATURE_INVALID"
QuoteGroupRevoked = "GROUP_REVOKED"
QuoteSignatureRevoked = "SIGNATURE_REVOKED"
QuoteKeyRevoked = "KEY_REVOKED"
QuoteSigRLVersionMismatch = "SIGRL_VERSION_MISMATCH"
QuoteGroupOutOfDate = "GROUP_OUT_OF_DATE"
QuoteConfigurationNeeded = "CONFIGURATION_NEEDED"
QuoteSwHardeningNeeded = "SW_HARDENING_NEEDED"
QuoteConfigurationAndSwHardeningNeeded = "CONFIGURATION_AND_SW_HARDENING_NEEDED"
)
// Note: currently, LCP supports only secp256k1
func VerifySignature(msg []byte, signature []byte, signer common.Address) error {
pubKey, err := secp256k1.RecoverPubkey(msg, signature)
if err != nil {
return err
}
pub, err := crypto.UnmarshalPubkey(pubKey)
if err != nil {
return err
}
addr := crypto.PubkeyToAddress(*pub)
if signer == addr {
return nil
} else {
return fmt.Errorf("unexpected signer: expected=%v actual=%v", signer.Hex(), addr.Hex())
}
}
func VerifySignatureWithSignBytes(signBytes []byte, signature []byte, expectedSigner common.Address) error {
if l := len(signature); l != 65 {
return fmt.Errorf("invalid signature length: expected=%v actual=%v", 65, l)
}
if l := len(expectedSigner); l != common.AddressLength {
return fmt.Errorf("invalid signer length: expected=%v actual=%v", common.AddressLength, l)
}
msg := crypto.Keccak256(signBytes)
return VerifySignature(msg, signature, expectedSigner)
}
type StateID [32]byte
func (id StateID) EqualBytes(bz []byte) bool {
return bytes.Equal(id[:], bz)
}
type UpdateClientCommitment struct {
PrevStateID *StateID
NewStateID StateID
NewState []byte
PrevHeight *clienttypes.Height
NewHeight clienttypes.Height
Timestamp big.Int
ValidationParams []byte
}
type RLPUpdateClientCommitment struct {
PrevStateID []byte
NewStateID [32]byte
NewState []byte
PrevHeight []byte
NewHeight [16]byte
Timestamp [16]byte
ValidationParams []byte
}
func (c *RLPUpdateClientCommitment) ToUpdateClientCommitment() (*UpdateClientCommitment, error) {
var (
commitment UpdateClientCommitment
err error
)
if l := len(c.PrevStateID); l == 32 {
commitment.PrevStateID = (*StateID)(c.PrevStateID)
} else if l > 0 {
return nil, fmt.Errorf("PrevStateID length must be 0 or 32, but got %v", l)
}
commitment.NewStateID = c.NewStateID
commitment.NewState = c.NewState
if len(c.PrevHeight) > 0 {
commitment.PrevHeight, err = bzToHeight(c.PrevHeight)
if err != nil {
return nil, err
}
}
newHeight, err := bzToHeight(c.NewHeight[:])
if err != nil {
return nil, err
}
commitment.NewHeight = *newHeight
var timestamp big.Int
commitment.Timestamp = *timestamp.SetBytes(c.Timestamp[:])
commitment.ValidationParams = c.ValidationParams
return &commitment, nil
}
func bzToHeight(bz []byte) (*clienttypes.Height, error) {
var height clienttypes.Height
if l := len(bz); l != 16 {
return nil, fmt.Errorf("unexpcted bytes length: expected=%v actual=%v", 16, l)
}
height.RevisionNumber = sdk.BigEndianToUint64(bz[:8])
height.RevisionHeight = sdk.BigEndianToUint64(bz[8:])
return &height, nil
}
func ParseUpdateClientCommitment(bz []byte) (*UpdateClientCommitment, error) {
var rc RLPUpdateClientCommitment
if err := rlp.DecodeBytes(bz, &rc); err != nil {
return nil, err
}
return rc.ToUpdateClientCommitment()
}
type StateCommitment struct {
Prefix []byte
Path []byte
Value [32]byte
Height clienttypes.Height
StateID StateID
}
type StateCommitmentProof struct {
CommitmentBytes []byte
Signer []byte
Signature []byte
}
func NewStateCommitmentProof(commitmentBytes, signer, signature []byte) StateCommitmentProof {
return StateCommitmentProof{CommitmentBytes: commitmentBytes, Signer: signer, Signature: signature}
}
func (p StateCommitmentProof) ToRLPBytes() []byte {
bz, err := rlp.EncodeToBytes(p)
if err != nil {
panic(err)
}
return bz
}
func (p StateCommitmentProof) GetCommitment() (*StateCommitment, error) {
return ParseStateCommitment(p.CommitmentBytes)
}
func ParseStateCommitmentProof(bz []byte) (*StateCommitmentProof, error) {
var proof StateCommitmentProof
if err := rlp.DecodeBytes(bz, &proof); err != nil {
return nil, err
}
return &proof, nil
}
func ParseStateCommitment(bz []byte) (*StateCommitment, error) {
var commitment StateCommitment
buf := bytes.NewBuffer(bz)
st := rlp.NewStream(buf, 0)
if _, err := st.List(); err != nil {
return nil, err
}
if err := st.Decode(&commitment.Prefix); err != nil {
return nil, err
}
if err := st.Decode(&commitment.Path); err != nil {
return nil, err
}
if err := st.Decode(&commitment.Value); err != nil {
return nil, err
}
heightBytes, err := st.Bytes()
if err != nil {
return nil, err
}
height, err := bzToHeight(heightBytes)
if err != nil {
return nil, err
}
commitment.Height = *height
if err := st.Decode(&commitment.StateID); err != nil {
return nil, err
}
if err := st.ListEnd(); err != nil {
return nil, err
}
return &commitment, nil
}