nimbus-eth1/nimbus/transaction.nim

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# 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
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constants, errors, eth/[common, rlp, keys], nimcrypto, utils
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proc initTransaction*(nonce: AccountNonce, gasPrice, gasLimit: GasInt, to: EthAddress,
value: UInt256, payload: Blob, V: byte, R, S: UInt256, isContractCreation = false): Transaction =
result.accountNonce = nonce
result.gasPrice = gasPrice
result.gasLimit = gasLimit
result.to = to
result.value = value
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result.payload = payload
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result.V = V
result.R = R
result.S = S
result.isContractCreation = isContractCreation
func intrinsicGas*(data: openarray[byte]): GasInt =
result = 21_000 # GasTransaction
for i in data:
if i == 0:
result += 4 # GasTXDataZero
else:
result += 68 # GasTXDataNonZero
proc intrinsicGas*(t: Transaction): GasInt =
# 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 = t.payload.intrinsicGas
proc validate*(t: Transaction) =
# Hook called during instantiation to ensure that all transaction
# parameters pass validation rules
if t.intrinsicGas() > t.gasLimit:
raise newException(ValidationError, "Insufficient gas")
# self.check_signature_validity()
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type
TransHashObj = object
accountNonce: AccountNonce
gasPrice: GasInt
gasLimit: GasInt
to {.rlpCustomSerialization.}: EthAddress
value: UInt256
payload: Blob
mIsContractCreation {.rlpIgnore.}: bool
proc read(rlp: var Rlp, t: var TransHashObj, _: type EthAddress): EthAddress {.inline.} =
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if rlp.blobLen != 0:
result = rlp.read(EthAddress)
else:
t.mIsContractCreation = true
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proc append(rlpWriter: var RlpWriter, t: TransHashObj, a: EthAddress) {.inline.} =
if t.mIsContractCreation:
rlpWriter.append("")
else:
rlpWriter.append(a)
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const
EIP155_CHAIN_ID_OFFSET = 35
func rlpEncode*(transaction: Transaction): auto =
# Encode transaction without signature
return rlp.encode(TransHashObj(
accountNonce: transaction.accountNonce,
gasPrice: transaction.gasPrice,
gasLimit: transaction.gasLimit,
to: transaction.to,
value: transaction.value,
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payload: transaction.payload,
mIsContractCreation: transaction.isContractCreation
))
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func rlpEncodeEIP155*(tx: Transaction): auto =
let V = (tx.V.int - EIP155_CHAIN_ID_OFFSET) div 2
# Encode transaction without signature
return rlp.encode(Transaction(
accountNonce: tx.accountNonce,
gasPrice: tx.gasPrice,
gasLimit: tx.gasLimit,
to: tx.to,
value: tx.value,
payload: tx.payload,
isContractCreation: tx.isContractCreation,
V: V.byte,
R: 0.u256,
S: 0.u256
))
func txHashNoSignature*(tx: Transaction): Hash256 =
# Hash transaction without signature
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return keccak256.digest(if tx.V.int >= EIP155_CHAIN_ID_OFFSET: tx.rlpEncodeEIP155 else: tx.rlpEncode)
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proc getSignature*(transaction: Transaction, output: var Signature): bool =
var bytes: array[65, byte]
bytes[0..31] = transaction.R.toByteArrayBE()
bytes[32..63] = transaction.S.toByteArrayBE()
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# TODO: V will become a byte or range soon.
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var v = transaction.V.int
if v >= EIP155_CHAIN_ID_OFFSET:
v = 28 - (v and 0x01)
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elif v == 27 or v == 28:
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discard
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else:
return false
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bytes[64] = byte(v - 27)
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result = recoverSignature(bytes, output) == EthKeysStatus.Success
proc toSignature*(transaction: Transaction): Signature =
if not getSignature(transaction, result):
raise newException(Exception, "Invalid signaure")
proc getSender*(transaction: Transaction, output: var EthAddress): bool =
## Find the address the transaction was sent from.
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var sig: Signature
if transaction.getSignature(sig):
var pubKey: PublicKey
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var txHash = transaction.txHashNoSignature
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if recoverSignatureKey(sig, txHash.data, pubKey) == EthKeysStatus.Success:
output = pubKey.toCanonicalAddress()
result = true
proc getSender*(transaction: Transaction): EthAddress =
## Raises error on failure to recover public key
if not transaction.getSender(result):
raise newException(ValidationError, "Could not derive sender address from transaction")
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proc getRecipient*(tx: Transaction): EthAddress =
if tx.isContractCreation:
let sender = tx.getSender()
result = generateAddress(sender, tx.accountNonce)
else:
result = tx.to