nimbus-eth1/nimbus/transaction.nim

160 lines
4.7 KiB
Nim

# Nimbus
# Copyright (c) 2018 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed except according to those terms.
import
./constants, ./errors, eth/[common, keys], ./utils,
./forks, ./vm_gas_costs
import eth/common/transaction as common_transaction
export common_transaction
func intrinsicGas*(data: openarray[byte], fork: Fork): GasInt =
result = gasFees[fork][GasTransaction]
for i in data:
if i == 0:
result += gasFees[fork][GasTXDataZero]
else:
result += gasFees[fork][GasTXDataNonZero]
proc intrinsicGas*(tx: Transaction, fork: Fork): GasInt =
const
ADDRESS_COST = 2400
STORAGE_KEY_COST = 1900
# Compute the baseline gas cost for this transaction. This is the amount
# of gas needed to send this transaction (but that is not actually used
# for computation)
result = tx.payload.intrinsicGas(fork)
if tx.contractCreation:
result = result + gasFees[fork][GasTXCreate]
if tx.txType > TxLegacy:
result = result + tx.accessList.len * ADDRESS_COST
var numKeys = 0
for n in tx.accessList:
inc(numKeys, n.storageKeys.len)
result = result + numKeys * STORAGE_KEY_COST
proc getSignature*(tx: Transaction, output: var Signature): bool =
var bytes: array[65, byte]
bytes[0..31] = tx.R.toByteArrayBE()
bytes[32..63] = tx.S.toByteArrayBE()
if tx.txType == TxLegacy:
var v = tx.V
if v >= EIP155_CHAIN_ID_OFFSET:
v = 28 - (v and 0x01)
elif v == 27 or v == 28:
discard
else:
return false
bytes[64] = byte(v - 27)
else:
bytes[64] = tx.V.byte
let sig = Signature.fromRaw(bytes)
if sig.isOk:
output = sig[]
return true
return false
proc toSignature*(tx: Transaction): Signature =
if not getSignature(tx, result):
raise newException(Exception, "Invalid signature")
proc getSender*(tx: Transaction, output: var EthAddress): bool =
## Find the address the transaction was sent from.
var sig: Signature
if tx.getSignature(sig):
var txHash = tx.txHashNoSignature
let pubkey = recover(sig, SkMessage(txHash.data))
if pubkey.isOk:
output = pubkey[].toCanonicalAddress()
result = true
proc getSender*(tx: Transaction): EthAddress =
## Raises error on failure to recover public key
if not tx.getSender(result):
raise newException(ValidationError, "Could not derive sender address from transaction")
proc getRecipient*(tx: Transaction, sender: EthAddress): EthAddress =
if tx.contractCreation:
result = generateAddress(sender, tx.nonce)
else:
result = tx.to.get()
proc validateTxLegacy(tx: Transaction, fork: Fork) =
var
vMin = 27'i64
vMax = 28'i64
if tx.V >= EIP155_CHAIN_ID_OFFSET:
let chainId = (tx.V - EIP155_CHAIN_ID_OFFSET) div 2
vMin = 35 + (2 * chainId)
vMax = vMin + 1
var isValid = tx.R >= Uint256.one
isValid = isValid and tx.S >= Uint256.one
isValid = isValid and tx.V >= vMin
isValid = isValid and tx.V <= vMax
isValid = isValid and tx.S < SECPK1_N
isValid = isValid and tx.R < SECPK1_N
if fork >= FkHomestead:
isValid = isValid and tx.S < SECPK1_N div 2
if not isValid:
raise newException(ValidationError, "Invalid transaction")
proc validateTxEip2930(tx: Transaction) =
var isValid = tx.V in {0'i64, 1'i64}
isValid = isValid and tx.S >= Uint256.one
isValid = isValid and tx.S < SECPK1_N
isValid = isValid and tx.R < SECPK1_N
if not isValid:
raise newException(ValidationError, "Invalid transaction")
proc validate*(tx: Transaction, fork: Fork) =
# parameters pass validation rules
if tx.intrinsicGas(fork) > tx.gasLimit:
raise newException(ValidationError, "Insufficient gas")
# check signature validity
var sender: EthAddress
if not tx.getSender(sender):
raise newException(ValidationError, "Invalid signature or failed message verification")
case tx.txType
of TxLegacy:
validateTxLegacy(tx, fork)
else:
validateTxEip2930(tx)
proc signTransaction*(tx: Transaction, privateKey: PrivateKey, chainId: ChainId, eip155: bool): Transaction =
result = tx
if eip155:
# trigger rlpEncodeEIP155 in nim-eth
result.V = chainId.int64 * 2'i64 + 35'i64
let
rlpTx = rlpEncode(result)
sig = sign(privateKey, rlpTx).toRaw
case tx.txType
of TxLegacy:
if eip155:
result.V = sig[64].int64 + result.V
else:
result.V = sig[64].int64 + 27'i64
else:
result.V = sig[64].int64
result.R = Uint256.fromBytesBE(sig[0..31])
result.S = Uint256.fromBytesBE(sig[32..63])