223 lines
6.9 KiB
Nim
223 lines
6.9 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/utils,
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common/evmforks, ./vm_gas_costs
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import eth/common/transaction as common_transaction
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export common_transaction, errors
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proc toWordSize(size: GasInt): GasInt =
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# Round input to the nearest bigger multiple of 32
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# tx validation will ensure the value is not too big
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if size > GasInt.high-31:
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return (GasInt.high shr 5) + 1
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(size + 31) shr 5
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func intrinsicGas*(data: openArray[byte], fork: EVMFork): 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: EVMFork): 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.contractCreation:
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result = result + gasFees[fork][GasTXCreate]
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if fork >= FkShanghai:
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# cannot use wordCount here, it will raise unlisted exception
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let numWords = toWordSize(tx.payload.len)
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result = result + (gasFees[fork][GasInitcodeWord] * numWords)
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if tx.txType > TxLegacy:
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result = result + tx.accessList.len * ACCESS_LIST_ADDRESS_COST
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var numKeys = 0
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for n in tx.accessList:
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inc(numKeys, n.storageKeys.len)
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result = result + numKeys * ACCESS_LIST_STORAGE_KEY_COST
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proc getSignature*(tx: Transaction, output: var Signature): bool =
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var bytes: array[65, byte]
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bytes[0..31] = tx.R.toByteArrayBE()
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bytes[32..63] = tx.S.toByteArrayBE()
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if tx.txType == TxLegacy:
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var v = tx.V
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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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else:
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bytes[64] = tx.V.byte
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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*(tx: Transaction): Signature =
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if not getSignature(tx, result):
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raise newException(Exception, "Invalid signature")
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proc getSender*(tx: 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 tx.getSignature(sig):
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var txHash = tx.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*(tx: Transaction): EthAddress =
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## Raises error on failure to recover public key
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if not tx.getSender(result):
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raise newException(ValidationError, "Could not derive sender address from transaction")
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proc getRecipient*(tx: Transaction, sender: EthAddress): EthAddress =
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if tx.contractCreation:
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result = generateAddress(sender, tx.nonce)
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else:
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result = tx.to.get()
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proc validateTxLegacy(tx: Transaction, fork: EVMFork) =
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var
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vMin = 27'i64
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vMax = 28'i64
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if tx.V >= EIP155_CHAIN_ID_OFFSET:
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let chainId = (tx.V - 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 >= vMin
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isValid = isValid and tx.V <= 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 legacy transaction")
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proc validateTxEip2930(tx: Transaction) =
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var isValid = tx.V in {0'i64, 1'i64}
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isValid = isValid and tx.S >= UInt256.one
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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 not isValid:
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raise newException(ValidationError, "Invalid typed transaction")
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proc validateTxEip4844(tx: Transaction) =
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validateTxEip2930(tx)
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var isValid = tx.payload.len <= MAX_CALLDATA_SIZE
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isValid = isValid and tx.accessList.len <= MAX_ACCESS_LIST_SIZE
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for acl in tx.accessList:
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isValid = isValid and
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(acl.storageKeys.len <= MAX_ACCESS_LIST_STORAGE_KEYS)
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isValid = isValid and
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tx.versionedHashes.len <= MAX_VERSIONED_HASHES_LIST_SIZE
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for bv in tx.versionedHashes:
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isValid = isValid and
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bv.data[0] == BLOB_COMMITMENT_VERSION_KZG
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if not isValid:
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raise newException(ValidationError, "Invalid EIP-4844 transaction")
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proc validate*(tx: Transaction, fork: EVMFork) =
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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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if fork >= FkShanghai and tx.contractCreation and tx.payload.len > EIP3860_MAX_INITCODE_SIZE:
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raise newException(ValidationError, "Initcode size exceeds max")
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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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case tx.txType
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of TxLegacy:
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validateTxLegacy(tx, fork)
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of TxEip4844:
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validateTxEip4844(tx)
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of TxEip2930, TxEip1559:
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validateTxEip2930(tx)
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proc signTransaction*(tx: Transaction, privateKey: PrivateKey, chainId: ChainId, eip155: bool): Transaction =
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result = tx
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if eip155:
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# trigger rlpEncodeEIP155 in nim-eth
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result.V = chainId.int64 * 2'i64 + 35'i64
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let
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rlpTx = rlpEncode(result)
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sig = sign(privateKey, rlpTx).toRaw
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case tx.txType
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of TxLegacy:
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if eip155:
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result.V = sig[64].int64 + result.V
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else:
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result.V = sig[64].int64 + 27'i64
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else:
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result.V = sig[64].int64
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result.R = UInt256.fromBytesBE(sig[0..31])
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result.S = UInt256.fromBytesBE(sig[32..63])
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func eip1559TxNormalization*(tx: Transaction;
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baseFee: GasInt; fork: EVMFork): Transaction =
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## This function adjusts a legacy transaction to EIP-1559 standard. This
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## is needed particularly when using the `validateTransaction()` utility
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## with legacy transactions.
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result = tx
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if tx.txType < TxEip1559:
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result.maxPriorityFee = tx.gasPrice
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result.maxFee = tx.gasPrice
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if FkLondon <= fork:
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result.gasPrice = baseFee + min(result.maxPriorityFee, result.maxFee - baseFee)
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func effectiveGasTip*(tx: Transaction; baseFee: Option[UInt256]): GasInt =
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var
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maxPriorityFee = tx.maxPriorityFee
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maxFee = tx.maxFee
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baseFee = baseFee.get(0.u256).truncate(GasInt)
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if tx.txType < TxEip1559:
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maxPriorityFee = tx.gasPrice
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maxFee = tx.gasPrice
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min(maxPriorityFee, maxFee - baseFee)
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proc decodeTx*(bytes: openArray[byte]): Transaction =
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var rlp = rlpFromBytes(bytes)
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result = rlp.read(Transaction)
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if rlp.hasData:
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raise newException(RlpError, "rlp: input contains more than one value")
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