The r and s returned by signTransaction to does not always consist of 64 characters

[pustovalov]

Expected behavior

Signature length should for r, s should be 66 bytes

Actual behavior

In some cases signature length for r, s can be 65 bytes

Steps to reproduce the behavior

import { Web3 } from 'web3'

(async () => {
  const url = 'https://testnet.aurora.dev'
  const web3Lib = new Web3(url)
  const wallet = '0x059f9dfBb8E8Ef58082354484991C46686F5F8B2'

  const transactionCount = await web3Lib.eth.getTransactionCount(
    wallet,
    'latest',
  )

  const tx = {
    to: wallet,
    value: web3Lib.utils.toWei('1', 'wei'),
    gas: 41000,
    nonce: web3Lib.utils.toHex(transactionCount)
  }

  const signedTx = await web3Lib.eth.accounts.signTransaction(
    tx,
    `0x${process.env.PRIVATE_KEY}`,
  )
  console.log('signedTx', signedTx)

  const transaction = await web3Lib.eth.sendSignedTransaction(signedTx.rawTransaction)
  const transactionByHash = await web3Lib.eth.getTransaction(transaction.transactionHash)

  console.log('transactionByHash', transactionByHash)
})()

Logs

signedTx {
  messageHash: '0x7b29f620af6ce4677b4d8a73e0c3107704c7521ec053a8850570f69a4f71cd3b',
  v: '0x9c8a82c9',
  r: '0x3ded0b10cedf23352ff65cee83e0f491c3ebe79346e74aef490a507dc411fa6',
  s: '0x284b6b6c77be9aaac2483c8f08ae27874067ae2c62f0b4feed2fba937ae9212a',
  rawTransaction: '0xf8658202c98082a02894059f9dfbb8e8ef58082354484991c46686f5f8b20180849c8a82c9a003ded0b10cedf23352ff65cee83e0f491c3ebe79346e74aef490a507dc411fa6a0284b6b6c77be9aaac2483c8f08ae27874067ae2c62f0b4feed2fba937ae9212a',
  transactionHash: '0x2a47755b3113a35615273906f3ff2b19c27c19380677503ca81d47a9c32cbb76'
}

transactionByHash {
  blockHash: '0xfc39219d5b96233844a8d822e92cf3b0e388275362f1cff1595ad3196bb2d73c',
  blockNumber: 129264354n,
  from: '0x059f9dfbb8e8ef58082354484991c46686f5f8b2',
  gas: 41000n,
  gasPrice: 0n,
  hash: '0x2a47755b3113a35615273906f3ff2b19c27c19380677503ca81d47a9c32cbb76',
  input: '0x',
  nonce: 713n,
  v: 2626323145n,
  r: '0x03ded0b10cedf23352ff65cee83e0f491c3ebe79346e74aef490a507dc411fa6',
  s: '0x284b6b6c77be9aaac2483c8f08ae27874067ae2c62f0b4feed2fba937ae9212a',
  to: '0x059f9dfbb8e8ef58082354484991c46686f5f8b2',
  type: 0n,
  transactionIndex: 0n,
  value: 1n,
  data: '0x'
}

In this case we have this signature generated by web3.js

r: 0x3ded0b10cedf23352ff65cee83e0f491c3ebe79346e74aef490a507dc411fa6

And result from the RPC is:

r: 0x03ded0b10cedf23352ff65cee83e0f491c3ebe79346e74aef490a507dc411fa6

And if decode this tx by ethers.js the result will be:

{
  "type": 0,
  "to": "0x059f9dfBb8E8Ef58082354484991C46686F5F8B2",
  "data": "0x",
  "nonce": 713,
  "gasLimit": "41000",
  "gasPrice": "0",
  "maxPriorityFeePerGas": null,
  "maxFeePerGas": null,
  "value": "1",
  "chainId": "1313161555",
  "sig": {
    "_type": "signature",
    "networkV": "2626323145",
    "r": "0x03ded0b10cedf23352ff65cee83e0f491c3ebe79346e74aef490a507dc411fa6",
    "s": "0x284b6b6c77be9aaac2483c8f08ae27874067ae2c62f0b4feed2fba937ae9212a",
    "v": 27
  },
  "accessList": null
}

with:

r: 0x03ded0b10cedf23352ff65cee83e0f491c3ebe79346e74aef490a507dc411fa6

Environment

Node: v18.16.0
web3.js: 4.0.1