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4ea11b9fb9
Transaction signing is something that happens in a lot of places - this PR introduces primitives for transaction signing in `transaction_utils` such that we can use the same logic across web3/eth1/etc for this simple operation. `transaction_utils` also contains a few more "spec-derived" helpers for working with transactions, such as the computation of a contract address etc that cannot easily be introduced in `transactions` itself without bringing in dependencies like secp and rlp, so they end up in a separate module. Finally, since these modules collect "versions" of these transaction types across different eips, some tests are moved to follow the same structure.
78 lines
2.4 KiB
Nim
78 lines
2.4 KiB
Nim
# 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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