65 lines
2.4 KiB
Nim
65 lines
2.4 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, eth_keys, rlp
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proc intrinsicGas*(t: Transaction): 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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raise newException(ValueError, "not implemented intrinsicGas")
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proc validate*(t: Transaction) =
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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 t.intrinsicGas() > t.gasLimit:
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raise newException(ValidationError, "Insufficient gas")
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# self.check_signature_validity()
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func hash*(transaction: Transaction): Hash256 =
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# Hash transaction without signature
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type
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TransHashObj = object
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accountNonce: uint64
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gasPrice: GasInt
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gasLimit: GasInt
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to: EthAddress
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value: UInt256
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payload: Blob
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return TransHashObj(
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accountNonce: transaction.accountNonce,
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gasPrice: transaction.gasPrice,
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gasLimit: transaction.gasLimit,
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to: transaction.to,
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value: transaction.value,
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payload: transaction.payload
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).rlpHash
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proc toSignature*(transaction: Transaction): Signature =
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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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bytes[64] = transaction.V
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initSignature(bytes)
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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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let
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txHash = transaction.hash # hash without signature
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sig = transaction.toSignature()
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var pubKey: PublicKey
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if recoverSignatureKey(sig, txHash.data, pubKey) == EthKeysStatus.Success:
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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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