112 lines
3.6 KiB
Nim
112 lines
3.6 KiB
Nim
# Nimbus
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# Copyright (c) 2018 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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constants, errors, eth/[common, keys], utils,
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./vm/interpreter/[vm_forks, gas_costs], constants
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import eth/common/transaction as common_transaction
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export common_transaction
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func intrinsicGas*(data: openarray[byte], fork: Fork): GasInt =
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result = gasFees[fork][GasTransaction]
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for i in data:
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if i == 0:
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result += gasFees[fork][GasTXDataZero]
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else:
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result += gasFees[fork][GasTXDataNonZero]
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proc intrinsicGas*(tx: Transaction, fork: Fork): GasInt =
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# Compute the baseline gas cost for this transaction. This is the amount
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# of gas needed to send this transaction (but that is not actually used
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# for computation)
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result = tx.payload.intrinsicGas(fork)
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if tx.isContractCreation:
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result = result + gasFees[fork][GasTXCreate]
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proc getSignature*(transaction: Transaction, output: var Signature): bool =
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var bytes: array[65, byte]
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bytes[0..31] = transaction.R.toByteArrayBE()
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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
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if v >= EIP155_CHAIN_ID_OFFSET:
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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:
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return false
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bytes[64] = byte(v - 27)
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let sig = Signature.fromRaw(bytes)
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if sig.isOk:
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output = sig[]
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return true
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return false
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proc toSignature*(transaction: Transaction): Signature =
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if not getSignature(transaction, result):
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raise newException(Exception, "Invalid signature")
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proc getSender*(transaction: Transaction, output: var EthAddress): bool =
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## Find the address the transaction was sent from.
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var sig: Signature
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if transaction.getSignature(sig):
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var txHash = transaction.txHashNoSignature
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let pubkey = recover(sig, SkMessage(txHash.data))
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if pubkey.isOk:
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output = pubkey[].toCanonicalAddress()
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result = true
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proc getSender*(transaction: Transaction): EthAddress =
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## Raises error on failure to recover public key
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if not transaction.getSender(result):
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raise newException(ValidationError, "Could not derive sender address from transaction")
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proc getRecipient*(tx: Transaction): EthAddress =
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if tx.isContractCreation:
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let sender = tx.getSender()
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result = generateAddress(sender, tx.accountNonce)
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else:
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result = tx.to
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proc validate*(tx: Transaction, fork: Fork) =
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# Hook called during instantiation to ensure that all transaction
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# parameters pass validation rules
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if tx.intrinsicGas(fork) > tx.gasLimit:
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raise newException(ValidationError, "Insufficient gas")
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# check signature validity
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var sender: EthAddress
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if not tx.getSender(sender):
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raise newException(ValidationError, "Invalid signature or failed message verification")
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var
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vMin = 27
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vMax = 28
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if tx.V.int >= EIP155_CHAIN_ID_OFFSET:
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let chainId = (tx.V.int - EIP155_CHAIN_ID_OFFSET) div 2
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vMin = 35 + (2 * chainId)
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vMax = vMin + 1
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var isValid = tx.R >= Uint256.one
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isValid = isValid and tx.S >= Uint256.one
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isValid = isValid and tx.V.int >= vMin
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isValid = isValid and tx.V.int <= vMax
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isValid = isValid and tx.S < SECPK1_N
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isValid = isValid and tx.R < SECPK1_N
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if fork >= FkHomestead:
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isValid = isValid and tx.S < SECPK1_N div 2
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if not isValid:
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raise newException(ValidationError, "Invalid transaction")
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