import eth/[common, rlp, keys], nimcrypto 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 result.payload = payload result.V = V result.R = R result.S = S result.isContractCreation = isContractCreation 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.} = if rlp.blobLen != 0: result = rlp.read(EthAddress) else: t.mIsContractCreation = true proc append(rlpWriter: var RlpWriter, t: TransHashObj, a: EthAddress) {.inline.} = if t.mIsContractCreation: rlpWriter.append("") else: rlpWriter.append(a) 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, payload: transaction.payload, mIsContractCreation: transaction.isContractCreation )) 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 return keccak256.digest(if tx.V.int >= EIP155_CHAIN_ID_OFFSET: tx.rlpEncodeEIP155 else: tx.rlpEncode)