mirror of
https://github.com/ethereum/go-ethereum.git
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5bb1f035a2
https://eips.ethereum.org/EIPS/eip-7883 --------- Co-authored-by: jwasinger <j-wasinger@hotmail.com> Co-authored-by: MariusVanDerWijden <m.vanderwijden@live.de> Co-authored-by: Felix Lange <fjl@twurst.com>
767 lines
25 KiB
Go
767 lines
25 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
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import (
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"crypto/sha256"
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"encoding/binary"
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"errors"
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"maps"
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"math"
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"math/big"
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"github.com/XinFinOrg/XDPoSChain/common"
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"github.com/XinFinOrg/XDPoSChain/core/tracing"
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"github.com/XinFinOrg/XDPoSChain/core/vm/privacy"
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"github.com/XinFinOrg/XDPoSChain/crypto"
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"github.com/XinFinOrg/XDPoSChain/crypto/blake2b"
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"github.com/XinFinOrg/XDPoSChain/crypto/bn256"
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"github.com/XinFinOrg/XDPoSChain/params"
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"golang.org/x/crypto/ripemd160"
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)
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// PrecompiledContract is the basic interface for native Go contracts. The implementation
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// requires a deterministic gas count based on the input size of the Run method of the
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// contract.
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type PrecompiledContract interface {
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RequiredGas(input []byte) uint64 // RequiredPrice calculates the contract gas use
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Run(input []byte) ([]byte, error) // Run runs the precompiled contract
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}
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// PrecompiledContracts contains the precompiled contracts supported at the given fork.
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type PrecompiledContracts map[common.Address]PrecompiledContract
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// PrecompiledContractsHomestead contains the default set of pre-compiled Ethereum
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// contracts used in the Frontier and Homestead releases.
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var PrecompiledContractsHomestead = PrecompiledContracts{
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common.BytesToAddress([]byte{1}): &ecrecover{},
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common.BytesToAddress([]byte{2}): &sha256hash{},
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common.BytesToAddress([]byte{3}): &ripemd160hash{},
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common.BytesToAddress([]byte{4}): &dataCopy{},
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}
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// PrecompiledContractsByzantium contains the default set of pre-compiled Ethereum
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// contracts used in the Byzantium release.
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var PrecompiledContractsByzantium = PrecompiledContracts{
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common.BytesToAddress([]byte{1}): &ecrecover{},
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common.BytesToAddress([]byte{2}): &sha256hash{},
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common.BytesToAddress([]byte{3}): &ripemd160hash{},
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common.BytesToAddress([]byte{4}): &dataCopy{},
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common.BytesToAddress([]byte{5}): &bigModExp{eip2565: false, eip7823: false, eip7883: false},
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common.BytesToAddress([]byte{6}): &bn256AddByzantium{},
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common.BytesToAddress([]byte{7}): &bn256ScalarMulByzantium{},
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common.BytesToAddress([]byte{8}): &bn256PairingByzantium{},
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common.BytesToAddress([]byte{30}): &ringSignatureVerifier{},
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common.BytesToAddress([]byte{40}): &bulletproofVerifier{},
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common.BytesToAddress([]byte{41}): &XDCxLastPrice{},
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common.BytesToAddress([]byte{42}): &XDCxEpochPrice{},
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}
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// PrecompiledContractsIstanbul contains the default set of pre-compiled Ethereum
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// contracts used in the Istanbul release.
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var PrecompiledContractsIstanbul = PrecompiledContracts{
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common.BytesToAddress([]byte{1}): &ecrecover{},
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common.BytesToAddress([]byte{2}): &sha256hash{},
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common.BytesToAddress([]byte{3}): &ripemd160hash{},
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common.BytesToAddress([]byte{4}): &dataCopy{},
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common.BytesToAddress([]byte{5}): &bigModExp{eip2565: false, eip7823: false, eip7883: false},
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common.BytesToAddress([]byte{6}): &bn256AddIstanbul{},
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common.BytesToAddress([]byte{7}): &bn256ScalarMulIstanbul{},
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common.BytesToAddress([]byte{8}): &bn256PairingIstanbul{},
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common.BytesToAddress([]byte{9}): &blake2F{},
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common.BytesToAddress([]byte{30}): &ringSignatureVerifier{},
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common.BytesToAddress([]byte{40}): &bulletproofVerifier{},
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common.BytesToAddress([]byte{41}): &XDCxLastPrice{},
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common.BytesToAddress([]byte{42}): &XDCxEpochPrice{},
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}
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// PrecompiledContractsXDCv2 contains the default set of pre-compiled Ethereum
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// contracts used in the XDC v2 release.
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var PrecompiledContractsXDCv2 = PrecompiledContracts{
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common.BytesToAddress([]byte{1}): &ecrecover{},
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common.BytesToAddress([]byte{2}): &sha256hash{},
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common.BytesToAddress([]byte{3}): &ripemd160hash{},
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common.BytesToAddress([]byte{4}): &dataCopy{},
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common.BytesToAddress([]byte{5}): &bigModExp{eip2565: false, eip7823: false, eip7883: false},
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common.BytesToAddress([]byte{6}): &bn256AddIstanbul{},
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common.BytesToAddress([]byte{7}): &bn256ScalarMulIstanbul{},
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common.BytesToAddress([]byte{8}): &bn256PairingIstanbul{},
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common.BytesToAddress([]byte{9}): &blake2F{},
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}
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// PrecompiledContractsEIP1559 contains the set of pre-compiled Ethereum
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// contracts used in the EIP1559 release.
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var PrecompiledContractsEIP1559 = PrecompiledContracts{
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common.BytesToAddress([]byte{1}): &ecrecover{},
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common.BytesToAddress([]byte{2}): &sha256hash{},
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common.BytesToAddress([]byte{3}): &ripemd160hash{},
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common.BytesToAddress([]byte{4}): &dataCopy{},
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common.BytesToAddress([]byte{5}): &bigModExp{eip2565: true, eip7823: false, eip7883: false},
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common.BytesToAddress([]byte{6}): &bn256AddIstanbul{},
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common.BytesToAddress([]byte{7}): &bn256ScalarMulIstanbul{},
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common.BytesToAddress([]byte{8}): &bn256PairingIstanbul{},
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common.BytesToAddress([]byte{9}): &blake2F{},
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}
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// PrecompiledContractsOsaka contains the set of pre-compiled Ethereum
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// contracts used in the Osaka release.
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var PrecompiledContractsOsaka = PrecompiledContracts{
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common.BytesToAddress([]byte{1}): &ecrecover{},
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common.BytesToAddress([]byte{2}): &sha256hash{},
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common.BytesToAddress([]byte{3}): &ripemd160hash{},
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common.BytesToAddress([]byte{4}): &dataCopy{},
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common.BytesToAddress([]byte{5}): &bigModExp{eip2565: true, eip7823: true, eip7883: true},
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common.BytesToAddress([]byte{6}): &bn256AddIstanbul{},
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common.BytesToAddress([]byte{7}): &bn256ScalarMulIstanbul{},
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common.BytesToAddress([]byte{8}): &bn256PairingIstanbul{},
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common.BytesToAddress([]byte{9}): &blake2F{},
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}
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var (
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PrecompiledAddressesOsaka []common.Address
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PrecompiledAddressesEIP1559 []common.Address
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PrecompiledAddressesXDCv2 []common.Address
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PrecompiledAddressesIstanbul []common.Address
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PrecompiledAddressesByzantium []common.Address
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PrecompiledAddressesHomestead []common.Address
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)
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func init() {
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for k := range PrecompiledContractsHomestead {
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PrecompiledAddressesHomestead = append(PrecompiledAddressesHomestead, k)
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}
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for k := range PrecompiledContractsByzantium {
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PrecompiledAddressesByzantium = append(PrecompiledAddressesByzantium, k)
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}
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for k := range PrecompiledContractsIstanbul {
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PrecompiledAddressesIstanbul = append(PrecompiledAddressesIstanbul, k)
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}
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for k := range PrecompiledContractsXDCv2 {
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PrecompiledAddressesXDCv2 = append(PrecompiledAddressesXDCv2, k)
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}
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for k := range PrecompiledContractsEIP1559 {
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PrecompiledAddressesEIP1559 = append(PrecompiledAddressesEIP1559, k)
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}
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for k := range PrecompiledContractsOsaka {
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PrecompiledAddressesOsaka = append(PrecompiledAddressesOsaka, k)
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}
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}
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func activePrecompiledContracts(rules params.Rules) PrecompiledContracts {
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switch {
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case rules.IsOsaka:
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return PrecompiledContractsOsaka
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case rules.IsEIP1559:
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return PrecompiledContractsEIP1559
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case rules.IsXDCxDisable:
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return PrecompiledContractsXDCv2
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case rules.IsIstanbul:
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return PrecompiledContractsIstanbul
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case rules.IsByzantium:
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return PrecompiledContractsByzantium
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default:
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return PrecompiledContractsHomestead
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}
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}
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// ActivePrecompiledContracts returns a copy of precompiled contracts enabled with the current configuration.
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func ActivePrecompiledContracts(rules params.Rules) PrecompiledContracts {
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return maps.Clone(activePrecompiledContracts(rules))
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}
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// ActivePrecompiles returns the precompile addresses enabled with the current configuration.
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func ActivePrecompiles(rules params.Rules) []common.Address {
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switch {
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case rules.IsOsaka:
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return PrecompiledAddressesOsaka
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case rules.IsEIP1559:
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return PrecompiledAddressesEIP1559
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case rules.IsXDCxDisable:
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return PrecompiledAddressesXDCv2
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case rules.IsIstanbul:
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return PrecompiledAddressesIstanbul
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case rules.IsByzantium:
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return PrecompiledAddressesByzantium
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default:
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return PrecompiledAddressesHomestead
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}
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}
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// RunPrecompiledContract runs and evaluates the output of a precompiled contract.
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// It returns
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// - the returned bytes,
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// - the _remaining_ gas,
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// - any error that occurred
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func RunPrecompiledContract(evm *EVM, p PrecompiledContract, input []byte, suppliedGas uint64, logger *tracing.Hooks) (ret []byte, remainingGas uint64, err error) {
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if evm != nil {
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if evm.chainConfig.IsTIPXDCXReceiver(evm.Context.BlockNumber) {
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switch p := p.(type) {
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case *XDCxEpochPrice:
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p.SetTradingState(evm.tradingStateDB)
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case *XDCxLastPrice:
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p.SetTradingState(evm.tradingStateDB)
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}
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}
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}
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gasCost := p.RequiredGas(input)
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if suppliedGas < gasCost {
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return nil, 0, ErrOutOfGas
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}
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if logger != nil && logger.OnGasChange != nil {
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logger.OnGasChange(suppliedGas, suppliedGas-gasCost, tracing.GasChangeCallPrecompiledContract)
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}
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suppliedGas -= gasCost
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output, err := p.Run(input)
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return output, suppliedGas, err
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}
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// ecrecover implemented as a native contract.
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type ecrecover struct{}
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func (c *ecrecover) RequiredGas(input []byte) uint64 {
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return params.EcrecoverGas
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}
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func (c *ecrecover) Run(input []byte) ([]byte, error) {
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const ecRecoverInputLength = 128
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input = common.RightPadBytes(input, ecRecoverInputLength)
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// "input" is (hash, v, r, s), each 32 bytes
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// but for ecrecover we want (r, s, v)
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r := new(big.Int).SetBytes(input[64:96])
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s := new(big.Int).SetBytes(input[96:128])
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v := input[63] - 27
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// tighter sig s values input homestead only apply to tx sigs
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if !allZero(input[32:63]) || !crypto.ValidateSignatureValues(v, r, s, false) {
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return nil, nil
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}
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// We must make sure not to modify the 'input', so placing the 'v' along with
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// the signature needs to be done on a new allocation
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var sig [crypto.SignatureLength]byte
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copy(sig[:], input[64:128])
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sig[64] = v
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// v needs to be at the end for libsecp256k1
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pubKey, err := crypto.Ecrecover(input[:32], sig[:])
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// make sure the public key is a valid one
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if err != nil {
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return nil, nil
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}
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// the first byte of pubkey is bitcoin heritage
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return common.LeftPadBytes(crypto.Keccak256(pubKey[1:])[12:], 32), nil
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}
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// SHA256 implemented as a native contract.
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type sha256hash struct{}
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// RequiredGas returns the gas required to execute the pre-compiled contract.
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//
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// This method does not require any overflow checking as the input size gas costs
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// required for anything significant is so high it's impossible to pay for.
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func (c *sha256hash) RequiredGas(input []byte) uint64 {
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return uint64(len(input)+31)/32*params.Sha256PerWordGas + params.Sha256BaseGas
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}
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func (c *sha256hash) Run(input []byte) ([]byte, error) {
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h := sha256.Sum256(input)
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return h[:], nil
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}
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// RIPEMD160 implemented as a native contract.
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type ripemd160hash struct{}
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// RequiredGas returns the gas required to execute the pre-compiled contract.
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//
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// This method does not require any overflow checking as the input size gas costs
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// required for anything significant is so high it's impossible to pay for.
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func (c *ripemd160hash) RequiredGas(input []byte) uint64 {
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return uint64(len(input)+31)/32*params.Ripemd160PerWordGas + params.Ripemd160BaseGas
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}
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func (c *ripemd160hash) Run(input []byte) ([]byte, error) {
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ripemd := ripemd160.New()
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ripemd.Write(input)
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return common.LeftPadBytes(ripemd.Sum(nil), 32), nil
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}
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// data copy implemented as a native contract.
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type dataCopy struct{}
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// RequiredGas returns the gas required to execute the pre-compiled contract.
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//
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// This method does not require any overflow checking as the input size gas costs
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// required for anything significant is so high it's impossible to pay for.
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func (c *dataCopy) RequiredGas(input []byte) uint64 {
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return uint64(len(input)+31)/32*params.IdentityPerWordGas + params.IdentityBaseGas
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}
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func (c *dataCopy) Run(in []byte) ([]byte, error) {
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return common.CopyBytes(in), nil
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}
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// bigModExp implements a native big integer exponential modular operation.
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type bigModExp struct {
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eip2565 bool
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eip7823 bool
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eip7883 bool
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}
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var (
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big0 = big.NewInt(0)
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big1 = big.NewInt(1)
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big3 = big.NewInt(3)
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big7 = big.NewInt(7)
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big20 = big.NewInt(20)
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big32 = big.NewInt(32)
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big64 = big.NewInt(64)
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big96 = big.NewInt(96)
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big480 = big.NewInt(480)
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big1024 = big.NewInt(1024)
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big3072 = big.NewInt(3072)
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big199680 = big.NewInt(199680)
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)
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// modexpMultComplexity implements bigModexp multComplexity formula, as defined in EIP-198
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//
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// def mult_complexity(x):
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//
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// if x <= 64: return x ** 2
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// elif x <= 1024: return x ** 2 // 4 + 96 * x - 3072
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// else: return x ** 2 // 16 + 480 * x - 199680
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//
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// where is x is max(length_of_MODULUS, length_of_BASE)
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func modexpMultComplexity(x *big.Int) *big.Int {
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switch {
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case x.Cmp(big64) <= 0:
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x.Mul(x, x) // x ** 2
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case x.Cmp(big1024) <= 0:
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// (x ** 2 // 4 ) + ( 96 * x - 3072)
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x = new(big.Int).Add(
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new(big.Int).Rsh(new(big.Int).Mul(x, x), 2),
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new(big.Int).Sub(new(big.Int).Mul(big96, x), big3072),
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)
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default:
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// (x ** 2 // 16) + (480 * x - 199680)
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x = new(big.Int).Add(
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new(big.Int).Rsh(new(big.Int).Mul(x, x), 4),
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new(big.Int).Sub(new(big.Int).Mul(big480, x), big199680),
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)
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}
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return x
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}
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// RequiredGas returns the gas required to execute the pre-compiled contract.
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func (c *bigModExp) RequiredGas(input []byte) uint64 {
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var (
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baseLen = new(big.Int).SetBytes(getData(input, 0, 32))
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expLen = new(big.Int).SetBytes(getData(input, 32, 32))
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modLen = new(big.Int).SetBytes(getData(input, 64, 32))
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)
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if len(input) > 96 {
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input = input[96:]
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} else {
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input = input[:0]
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}
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// Retrieve the head 32 bytes of exp for the adjusted exponent length
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var expHead *big.Int
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if big.NewInt(int64(len(input))).Cmp(baseLen) <= 0 {
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expHead = new(big.Int)
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} else {
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if expLen.Cmp(big32) > 0 {
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expHead = new(big.Int).SetBytes(getData(input, baseLen.Uint64(), 32))
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} else {
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expHead = new(big.Int).SetBytes(getData(input, baseLen.Uint64(), expLen.Uint64()))
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}
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}
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// Calculate the adjusted exponent length
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var msb int
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if bitlen := expHead.BitLen(); bitlen > 0 {
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msb = bitlen - 1
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}
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adjExpLen := new(big.Int)
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if expLen.Cmp(big32) > 0 {
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adjExpLen.Sub(expLen, big32)
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if c.eip7883 {
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adjExpLen.Lsh(adjExpLen, 4)
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} else {
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adjExpLen.Lsh(adjExpLen, 3)
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}
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}
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adjExpLen.Add(adjExpLen, big.NewInt(int64(msb)))
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// Calculate the gas cost of the operation
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gas := new(big.Int)
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if modLen.Cmp(baseLen) < 0 {
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gas.Set(baseLen)
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} else {
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gas.Set(modLen)
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}
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maxLenOver32 := gas.Cmp(big32) > 0
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if c.eip2565 {
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// EIP-2565 has three changes
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// 1. Different multComplexity (inlined here)
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// in EIP-2565 (https://eips.ethereum.org/EIPS/eip-2565):
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//
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// def mult_complexity(x):
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// ceiling(x/8)^2
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//
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// where is x is max(length_of_MODULUS, length_of_BASE)
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gas.Add(gas, big7)
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gas.Rsh(gas, 3)
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gas.Mul(gas, gas)
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var minPrice uint64 = 200
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if c.eip7883 {
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minPrice = 500
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if maxLenOver32 {
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gas.Add(gas, gas)
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} else {
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gas = big.NewInt(16)
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}
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}
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if adjExpLen.Cmp(big1) > 0 {
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gas.Mul(gas, adjExpLen)
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}
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// 2. Different divisor (`GQUADDIVISOR`) (3)
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|
gas.Div(gas, big3)
|
|
if gas.BitLen() > 64 {
|
|
return math.MaxUint64
|
|
}
|
|
return max(minPrice, gas.Uint64())
|
|
}
|
|
|
|
// Pre-Berlin logic.
|
|
gas = modexpMultComplexity(gas)
|
|
if adjExpLen.Cmp(big1) > 0 {
|
|
gas.Mul(gas, adjExpLen)
|
|
}
|
|
gas.Div(gas, big20)
|
|
if gas.BitLen() > 64 {
|
|
return math.MaxUint64
|
|
}
|
|
return gas.Uint64()
|
|
}
|
|
|
|
func (c *bigModExp) Run(input []byte) ([]byte, error) {
|
|
var (
|
|
baseLenBig = new(big.Int).SetBytes(getData(input, 0, 32))
|
|
expLenBig = new(big.Int).SetBytes(getData(input, 32, 32))
|
|
modLenBig = new(big.Int).SetBytes(getData(input, 64, 32))
|
|
baseLen = baseLenBig.Uint64()
|
|
expLen = expLenBig.Uint64()
|
|
modLen = modLenBig.Uint64()
|
|
inputLenOverflow = max(baseLenBig.BitLen(), expLenBig.BitLen(), modLenBig.BitLen()) > 64
|
|
)
|
|
if len(input) > 96 {
|
|
input = input[96:]
|
|
} else {
|
|
input = input[:0]
|
|
}
|
|
|
|
// enforce size cap for inputs
|
|
if c.eip7823 && (inputLenOverflow || max(baseLen, expLen, modLen) > 1024) {
|
|
return nil, errors.New("one or more of base/exponent/modulus length exceeded 1024 bytes")
|
|
}
|
|
// Handle a special case when both the base and mod length is zero
|
|
if baseLen == 0 && modLen == 0 {
|
|
return []byte{}, nil
|
|
}
|
|
// Retrieve the operands and execute the exponentiation
|
|
var (
|
|
base = new(big.Int).SetBytes(getData(input, 0, baseLen))
|
|
exp = new(big.Int).SetBytes(getData(input, baseLen, expLen))
|
|
mod = new(big.Int).SetBytes(getData(input, baseLen+expLen, modLen))
|
|
v []byte
|
|
)
|
|
switch {
|
|
case mod.BitLen() == 0:
|
|
// Modulo 0 is undefined, return zero
|
|
return common.LeftPadBytes([]byte{}, int(modLen)), nil
|
|
case base.BitLen() == 1: // a bit length of 1 means it's 1 (or -1).
|
|
// If base == 1, then we can just return base % mod (if mod >= 1, which it is)
|
|
v = base.Mod(base, mod).Bytes()
|
|
default:
|
|
v = base.Exp(base, exp, mod).Bytes()
|
|
}
|
|
return common.LeftPadBytes(v, int(modLen)), nil
|
|
}
|
|
|
|
// newCurvePoint unmarshals a binary blob into a bn256 elliptic curve point,
|
|
// returning it, or an error if the point is invalid.
|
|
func newCurvePoint(blob []byte) (*bn256.G1, error) {
|
|
p := new(bn256.G1)
|
|
if _, err := p.Unmarshal(blob); err != nil {
|
|
return nil, err
|
|
}
|
|
return p, nil
|
|
}
|
|
|
|
// newTwistPoint unmarshals a binary blob into a bn256 elliptic curve point,
|
|
// returning it, or an error if the point is invalid.
|
|
func newTwistPoint(blob []byte) (*bn256.G2, error) {
|
|
p := new(bn256.G2)
|
|
if _, err := p.Unmarshal(blob); err != nil {
|
|
return nil, err
|
|
}
|
|
return p, nil
|
|
}
|
|
|
|
// runBn256Add implements the Bn256Add precompile, referenced by both
|
|
// Byzantium and Istanbul operations.
|
|
func runBn256Add(input []byte) ([]byte, error) {
|
|
x, err := newCurvePoint(getData(input, 0, 64))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
y, err := newCurvePoint(getData(input, 64, 64))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
res := new(bn256.G1)
|
|
res.Add(x, y)
|
|
return res.Marshal(), nil
|
|
}
|
|
|
|
// bn256AddIstanbul implements a native elliptic curve point addition conforming to
|
|
// Istanbul consensus rules.
|
|
type bn256AddIstanbul struct{}
|
|
|
|
// RequiredGas returns the gas required to execute the pre-compiled contract.
|
|
func (c *bn256AddIstanbul) RequiredGas(input []byte) uint64 {
|
|
return params.Bn256AddGasIstanbul
|
|
}
|
|
|
|
func (c *bn256AddIstanbul) Run(input []byte) ([]byte, error) {
|
|
return runBn256Add(input)
|
|
}
|
|
|
|
// bn256AddByzantium implements a native elliptic curve point addition
|
|
// conforming to Byzantium consensus rules.
|
|
type bn256AddByzantium struct{}
|
|
|
|
// RequiredGas returns the gas required to execute the pre-compiled contract.
|
|
func (c *bn256AddByzantium) RequiredGas(input []byte) uint64 {
|
|
return params.Bn256AddGasByzantium
|
|
}
|
|
|
|
func (c *bn256AddByzantium) Run(input []byte) ([]byte, error) {
|
|
return runBn256Add(input)
|
|
}
|
|
|
|
// runBn256ScalarMul implements the Bn256ScalarMul precompile, referenced by
|
|
// both Byzantium and Istanbul operations.
|
|
func runBn256ScalarMul(input []byte) ([]byte, error) {
|
|
p, err := newCurvePoint(getData(input, 0, 64))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
res := new(bn256.G1)
|
|
res.ScalarMult(p, new(big.Int).SetBytes(getData(input, 64, 32)))
|
|
return res.Marshal(), nil
|
|
}
|
|
|
|
// bn256ScalarMulIstanbul implements a native elliptic curve scalar
|
|
// multiplication conforming to Istanbul consensus rules.
|
|
type bn256ScalarMulIstanbul struct{}
|
|
|
|
// RequiredGas returns the gas required to execute the pre-compiled contract.
|
|
func (c *bn256ScalarMulIstanbul) RequiredGas(input []byte) uint64 {
|
|
return params.Bn256ScalarMulGasIstanbul
|
|
}
|
|
|
|
func (c *bn256ScalarMulIstanbul) Run(input []byte) ([]byte, error) {
|
|
return runBn256ScalarMul(input)
|
|
}
|
|
|
|
// bn256ScalarMulByzantium implements a native elliptic curve scalar
|
|
// multiplication conforming to Byzantium consensus rules.
|
|
type bn256ScalarMulByzantium struct{}
|
|
|
|
// RequiredGas returns the gas required to execute the pre-compiled contract.
|
|
func (c *bn256ScalarMulByzantium) RequiredGas(input []byte) uint64 {
|
|
return params.Bn256ScalarMulGasByzantium
|
|
}
|
|
|
|
func (c *bn256ScalarMulByzantium) Run(input []byte) ([]byte, error) {
|
|
return runBn256ScalarMul(input)
|
|
}
|
|
|
|
var (
|
|
// true32Byte is returned if the bn256 pairing check succeeds.
|
|
true32Byte = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}
|
|
|
|
// false32Byte is returned if the bn256 pairing check fails.
|
|
false32Byte = make([]byte, 32)
|
|
|
|
// errBadPairingInput is returned if the bn256 pairing input is invalid.
|
|
errBadPairingInput = errors.New("bad elliptic curve pairing size")
|
|
)
|
|
|
|
// runBn256Pairing implements the Bn256Pairing precompile, referenced by both
|
|
// Byzantium and Istanbul operations.
|
|
func runBn256Pairing(input []byte) ([]byte, error) {
|
|
// Handle some corner cases cheaply
|
|
if len(input)%192 > 0 {
|
|
return nil, errBadPairingInput
|
|
}
|
|
// Convert the input into a set of coordinates
|
|
var (
|
|
cs []*bn256.G1
|
|
ts []*bn256.G2
|
|
)
|
|
for i := 0; i < len(input); i += 192 {
|
|
c, err := newCurvePoint(input[i : i+64])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
t, err := newTwistPoint(input[i+64 : i+192])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
cs = append(cs, c)
|
|
ts = append(ts, t)
|
|
}
|
|
// Execute the pairing checks and return the results
|
|
if bn256.PairingCheck(cs, ts) {
|
|
return true32Byte, nil
|
|
}
|
|
return false32Byte, nil
|
|
}
|
|
|
|
type ringSignatureVerifier struct{}
|
|
type bulletproofVerifier struct{}
|
|
|
|
func (c *bulletproofVerifier) RequiredGas(input []byte) uint64 {
|
|
//the gas should depends on the ringsize
|
|
return 100000
|
|
}
|
|
|
|
func (c *ringSignatureVerifier) RequiredGas(input []byte) uint64 {
|
|
//the gas should depends on the ringsize
|
|
return 100000
|
|
}
|
|
|
|
func (c *ringSignatureVerifier) Run(proof []byte) ([]byte, error) {
|
|
der, err := privacy.Deserialize(proof)
|
|
if err != nil {
|
|
return []byte{}, errors.New("fail to deserialize proof")
|
|
}
|
|
if !privacy.Verify(der, false) {
|
|
return []byte{}, errors.New("fail to verify ring signature")
|
|
}
|
|
return []byte{}, nil
|
|
}
|
|
|
|
func (c *bulletproofVerifier) Run(proof []byte) ([]byte, error) {
|
|
mrp := new(privacy.MultiRangeProof)
|
|
if mrp.Deserialize(proof) != nil {
|
|
return []byte{}, errors.New("failed to deserialize bulletproofs")
|
|
}
|
|
|
|
if !privacy.MRPVerify(mrp) {
|
|
return []byte{}, errors.New("failed to verify bulletproof")
|
|
}
|
|
return []byte{}, nil
|
|
}
|
|
|
|
// bn256PairingIstanbul implements a pairing pre-compile for the bn256 curve
|
|
// conforming to Istanbul consensus rules.
|
|
type bn256PairingIstanbul struct{}
|
|
|
|
// RequiredGas returns the gas required to execute the pre-compiled contract.
|
|
func (c *bn256PairingIstanbul) RequiredGas(input []byte) uint64 {
|
|
return params.Bn256PairingBaseGasIstanbul + uint64(len(input)/192)*params.Bn256PairingPerPointGasIstanbul
|
|
}
|
|
|
|
func (c *bn256PairingIstanbul) Run(input []byte) ([]byte, error) {
|
|
return runBn256Pairing(input)
|
|
}
|
|
|
|
// bn256PairingByzantium implements a pairing pre-compile for the bn256 curve
|
|
// conforming to Byzantium consensus rules.
|
|
type bn256PairingByzantium struct{}
|
|
|
|
// RequiredGas returns the gas required to execute the pre-compiled contract.
|
|
func (c *bn256PairingByzantium) RequiredGas(input []byte) uint64 {
|
|
return params.Bn256PairingBaseGasByzantium + uint64(len(input)/192)*params.Bn256PairingPerPointGasByzantium
|
|
}
|
|
|
|
func (c *bn256PairingByzantium) Run(input []byte) ([]byte, error) {
|
|
return runBn256Pairing(input)
|
|
}
|
|
|
|
type blake2F struct{}
|
|
|
|
func (c *blake2F) RequiredGas(input []byte) uint64 {
|
|
// If the input is malformed, we can't calculate the gas, return 0 and let the
|
|
// actual call choke and fault.
|
|
if len(input) != blake2FInputLength {
|
|
return 0
|
|
}
|
|
return uint64(binary.BigEndian.Uint32(input[0:4]))
|
|
}
|
|
|
|
const (
|
|
blake2FInputLength = 213
|
|
blake2FFinalBlockBytes = byte(1)
|
|
blake2FNonFinalBlockBytes = byte(0)
|
|
)
|
|
|
|
var (
|
|
errBlake2FInvalidInputLength = errors.New("invalid input length")
|
|
errBlake2FInvalidFinalFlag = errors.New("invalid final flag")
|
|
)
|
|
|
|
func (c *blake2F) Run(input []byte) ([]byte, error) {
|
|
// Make sure the input is valid (correct length and final flag)
|
|
if len(input) != blake2FInputLength {
|
|
return nil, errBlake2FInvalidInputLength
|
|
}
|
|
if input[212] != blake2FNonFinalBlockBytes && input[212] != blake2FFinalBlockBytes {
|
|
return nil, errBlake2FInvalidFinalFlag
|
|
}
|
|
// Parse the input into the Blake2b call parameters
|
|
var (
|
|
rounds = binary.BigEndian.Uint32(input[0:4])
|
|
final = input[212] == blake2FFinalBlockBytes
|
|
|
|
h [8]uint64
|
|
m [16]uint64
|
|
t [2]uint64
|
|
)
|
|
for i := 0; i < 8; i++ {
|
|
offset := 4 + i*8
|
|
h[i] = binary.LittleEndian.Uint64(input[offset : offset+8])
|
|
}
|
|
for i := 0; i < 16; i++ {
|
|
offset := 68 + i*8
|
|
m[i] = binary.LittleEndian.Uint64(input[offset : offset+8])
|
|
}
|
|
t[0] = binary.LittleEndian.Uint64(input[196:204])
|
|
t[1] = binary.LittleEndian.Uint64(input[204:212])
|
|
|
|
// Execute the compression function, extract and return the result
|
|
blake2b.F(&h, m, t, final, rounds)
|
|
|
|
output := make([]byte, 64)
|
|
for i := 0; i < 8; i++ {
|
|
offset := i * 8
|
|
binary.LittleEndian.PutUint64(output[offset:offset+8], h[i])
|
|
}
|
|
return output, nil
|
|
}
|