@nomicfoundation/ethereumjs-tx/src/capabilities/eip2718.ts

Implementation of the various Ethereum Transaction Types

import { RLP } from '@nomicfoundation/ethereumjs-rlp'
import { BIGINT_0, BIGINT_1, concatBytes } from '@nomicfoundation/ethereumjs-util'
import { keccak256 as bufferKeccak256 } from 'ethereum-cryptography/keccak.js'

import { txTypeBytes } from '../util.js'

import { errorMsg } from './legacy.js'

import type { EIP2718CompatibleTx } from '../types.js'
import type { Input } from '@nomicfoundation/ethereumjs-rlp'

function keccak256(msg: Uint8Array): Uint8Array {
  return new Uint8Array(bufferKeccak256(Buffer.from(msg)))
}

export function getHashedMessageToSign(tx: EIP2718CompatibleTx): Uint8Array {
  const keccakFunction = tx.common.customCrypto.keccak256 ?? keccak256
  return keccakFunction(tx.getMessageToSign())
}

export function serialize(tx: EIP2718CompatibleTx, base?: Input): Uint8Array {
  return concatBytes(txTypeBytes(tx.type), RLP.encode(base ?? tx.raw()))
}

export function validateYParity(tx: EIP2718CompatibleTx) {
  const { v } = tx
  if (v !== undefined && v !== BIGINT_0 && v !== BIGINT_1) {
    const msg = errorMsg(tx, 'The y-parity of the transaction should either be 0 or 1')
    throw new Error(msg)
  }
}