mirror of https://github.com/status-im/nim-eth.git
78 lines
2.4 KiB
Nim
78 lines
2.4 KiB
Nim
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# eth
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# Copyright (c) 2024 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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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 ./[keys, transactions, transactions_rlp]
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export keys, transactions
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proc signature*(tx: Transaction): Opt[Signature] =
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var bytes {.noinit.}: array[65, byte]
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bytes[0 .. 31] = tx.R.toBytesBE()
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bytes[32 .. 63] = tx.S.toBytesBE()
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bytes[64] =
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if tx.txType != TxLegacy:
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tx.V.byte
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elif tx.V >= EIP155_CHAIN_ID_OFFSET:
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byte(1 - (tx.V and 1))
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elif tx.V == 27 or tx.V == 28:
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byte(tx.V - 27)
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else:
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return Opt.none(Signature)
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Signature.fromRaw(bytes).mapConvertErr(void)
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proc `signature=`*(tx: var Transaction, param: tuple[sig: Signature, eip155: bool]) =
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let raw = param.sig.toRaw()
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tx.R = UInt256.fromBytesBE(raw.toOpenArray(0, 31))
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tx.S = UInt256.fromBytesBE(raw.toOpenArray(32, 63))
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let v = raw[64].uint64
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tx.V =
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case tx.txType
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of TxLegacy:
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if param.eip155:
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v + uint64(tx.chainId) * 2 + 35
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else:
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v + 27'u64
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else:
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v
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proc sign*(tx: Transaction, pk: PrivateKey, eip155: bool): (Signature, bool) =
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let hash = tx.rlpHashForSigning(eip155)
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(sign(pk, SkMessage(hash.data)), eip155)
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proc recoverKey*(tx: Transaction): Opt[PublicKey] =
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## Recovering key / sender is a costly operation - make sure to reuse the
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## outcome!
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##
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## Returns `none` if the signature is invalid with respect to the rest of
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## the transaction data.
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let
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sig = ?tx.signature()
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txHash = tx.rlpHashForSigning(tx.isEip155())
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recover(sig, SkMessage(txHash.data)).mapConvertErr(void)
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proc recoverSender*(tx: Transaction): Opt[Address] =
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## Recovering key / sender is a costly operation - make sure to reuse the
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## outcome!
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##
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## Returns `none` if the signature is invalid with respect to the rest of
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## the transaction data.
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let key = ?tx.recoverKey()
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ok key.to(Address)
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proc creationAddress*(tx: Transaction, sender: Address): Address =
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let hash = keccak256(rlp.encodeList(sender, tx.nonce))
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hash.to(Address)
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proc getRecipient*(tx: Transaction, sender: Address): Address =
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tx.to.valueOr(tx.creationAddress(sender))
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