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offchain_config_digester.go
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offchain_config_digester.go
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package llo
import (
"crypto/ed25519"
"encoding/binary"
"encoding/hex"
"fmt"
"math/big"
"strings"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/pkg/errors"
"github.com/smartcontractkit/libocr/offchainreporting2plus/types"
ocrtypes "github.com/smartcontractkit/libocr/offchainreporting2plus/types"
"github.com/smartcontractkit/wsrpc/credentials"
"github.com/smartcontractkit/chainlink/v2/core/gethwrappers/llo-feeds/generated/exposed_channel_verifier"
)
// Originally sourced from: https://github.com/smartcontractkit/offchain-reporting/blob/991ebe1462fd56826a1ddfb34287d542acb2baee/lib/offchainreporting2/chains/evmutil/offchain_config_digester.go
var _ ocrtypes.OffchainConfigDigester = OffchainConfigDigester{}
func NewOffchainConfigDigester(chainID *big.Int, contractAddress common.Address) OffchainConfigDigester {
return OffchainConfigDigester{chainID, contractAddress}
}
type OffchainConfigDigester struct {
ChainID *big.Int
ContractAddress common.Address
}
func (d OffchainConfigDigester) ConfigDigest(cc ocrtypes.ContractConfig) (ocrtypes.ConfigDigest, error) {
signers := []common.Address{}
for i, signer := range cc.Signers {
if len(signer) != 20 {
return ocrtypes.ConfigDigest{}, errors.Errorf("%v-th evm signer should be a 20 byte address, but got %x", i, signer)
}
a := common.BytesToAddress(signer)
signers = append(signers, a)
}
transmitters := []credentials.StaticSizedPublicKey{}
for i, transmitter := range cc.Transmitters {
if len(transmitter) != 2*ed25519.PublicKeySize {
return ocrtypes.ConfigDigest{}, errors.Errorf("%v-th evm transmitter should be a 64 character hex-encoded ed25519 public key, but got '%v' (%d chars)", i, transmitter, len(transmitter))
}
var t credentials.StaticSizedPublicKey
b, err := hex.DecodeString(string(transmitter))
if err != nil {
return ocrtypes.ConfigDigest{}, errors.Wrapf(err, "%v-th evm transmitter is not valid hex, got: %q", i, transmitter)
}
copy(t[:], b)
transmitters = append(transmitters, t)
}
return configDigest(
d.ChainID,
d.ContractAddress,
cc.ConfigCount,
signers,
transmitters,
cc.F,
cc.OnchainConfig,
cc.OffchainConfigVersion,
cc.OffchainConfig,
)
}
func (d OffchainConfigDigester) ConfigDigestPrefix() (ocrtypes.ConfigDigestPrefix, error) {
return ocrtypes.ConfigDigestPrefixLLO, nil
}
func makeConfigDigestArgs() abi.Arguments {
abi, err := abi.JSON(strings.NewReader(exposed_channel_verifier.ExposedChannelVerifierABI))
if err != nil {
// assertion
panic(fmt.Sprintf("could not parse aggregator ABI: %s", err.Error()))
}
return abi.Methods["exposedConfigDigestFromConfigData"].Inputs
}
var configDigestArgs = makeConfigDigestArgs()
func configDigest(
chainID *big.Int,
contractAddress common.Address,
configCount uint64,
oracles []common.Address,
transmitters []credentials.StaticSizedPublicKey,
f uint8,
onchainConfig []byte,
offchainConfigVersion uint64,
offchainConfig []byte,
) (types.ConfigDigest, error) {
msg, err := configDigestArgs.Pack(
chainID,
contractAddress,
configCount,
oracles,
transmitters,
f,
onchainConfig,
offchainConfigVersion,
offchainConfig,
)
if err != nil {
return types.ConfigDigest{}, fmt.Errorf("could not pack config digest args: %v", err)
}
rawHash := crypto.Keccak256(msg)
configDigest := types.ConfigDigest{}
if n := copy(configDigest[:], rawHash); n != len(configDigest) {
return types.ConfigDigest{}, fmt.Errorf("copied too little data: %d/%d", n, len(configDigest))
}
binary.BigEndian.PutUint16(configDigest[:2], uint16(ocrtypes.ConfigDigestPrefixLLO))
if !(configDigest[0] == 0 && configDigest[1] == 9) {
return types.ConfigDigest{}, fmt.Errorf("wrong ConfigDigestPrefix; got: %x, expected: %d", configDigest[:2], ocrtypes.ConfigDigestPrefixLLO)
}
return configDigest, nil
}