Ethereum - User operations EIP-4337. All fields MUST be set as hex values.

[DenisDemyanko]

Hello, please help me. I want to receive JSON from user operations EIP-4337.

I received JSON, but JSON does not contain hex values (gas values & nonce)

When I try sent this JSON, I received the error - "Invalid hex value for property nonce:0 in UserOp" or "Invalid hex value for property maxFeePerGas:1507969922 in UserOp".

Please help me, how I can get JSON with hex values. Or what do I need to receive valid EthereumSigningOutput.
And I think the signature is invalid because we do sign not hex values? Or maybe you can help me, with how to receive a valid signature, if I will change all values to hex in JSON.

UserOperation a full user-operation struct. All fields MUST be set as hex values. empty bytes block (e.g. empty initCode) MUST be set to "0x"

My code:
let input = EthereumSigningInput.with { $0.chainID = Data(hexString: "0x000539")! $0.nonce = Data(hexString: "00")! $0.maxFeePerGas = Data(hexString: "0x59e1cb82")! $0.maxInclusionFeePerGas = Data(hexString: "0x59e1cb82")! //maxPriorityFeePerGas $0.txMode = .userOp $0.gasLimit = Data(hexString: "0x5454")! $0.privateKey = wallet.getKeyForCoin(coin: .ethereum).data $0.userOperation = EthereumUserOperation.with { $0.verificationGasLimit = Data(hexString: "0x05f997")! $0.preVerificationGas = Data(hexString: "0x015bd8")! $0.entryPoint = entryPointAddress $0.sender = myWalletTokenAddress $0.initCode = Data(hexString: initCode)! $0.paymasterAndData = Data(hexString: defaultPaymaster)! } }

let output: EthereumSigningOutput = AnySigner.sign(input: input, coin: .ethereum)

let jsonString = String(data: output.encoded, encoding: .utf8)

Example of JSON:

{"callData":"0xb61d27f60000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000000","callGasLimit":"21588","initCode":"0x40154c8909789bef6e8ed93befd234334c8d11155fbfb9cf000000000000000000000000b40284e302dc2d6e9e7be7784ba0ebe4aef7e5b60000000000000000000000000000000000000000000000000000000000000000","maxFeePerGas":"1507969922","maxPriorityFeePerGas":"1507969922","nonce":"0","paymasterAndData":"0xd0961c1ce3c333040ba3630fc64bf3ea84fef1bf","preVerificationGas":"89048","sender":"0x6d7185f1a41179fc8788a8aed97218d2403375bf","signature":"0x2276b6ce2fbe379d9761177174cdda9e9cfa001d23dd9c31d89c579a9d99e2450135c4f481aa9c44bbe1c52b57461b70ff7ec657931c363131c5d6ce8b086df51b","verificationGasLimit":"391575"}

[satoshiotomakan]

Hi @DenisDemyanko, you can try to use java.math.BigInteger to parse the decimal string and convert to a hex string:

BigInteger maxFeePerGas = new BigInteger(receivedJson.maxFeePerGas);
let input = EthereumSigningInput.with {
    $0.maxFeePerGas = Data(hexString: maxFeePerGas.toString(16))!
    // ...
};

[DenisDemyanko]

@satoshiotomakan thank you.
Could you please help me, what am I doing wrong? I am getting the wrong signature.
I want to call eth_sendUserOperation method, but when I try to send method, I received error:

 "error": {
        "message": "Invalid UserOp signature or paymaster signature",
        "code": -32507
    }

The pre-hash of the transaction is valid, because if I manually change the signature in the received JSON to valid signature, the result of the API function will be a hash that matches output.preHash.hexString

{
    "jsonrpc": "2.0",
    "id": 44,
    "result": "0x8321b2d6301b0f49945eabbfd38f7dcaa53ac846933468a165f0695500f3f756"
}

Here is my code to generate output

`let factoryAddress = "0x40154C8909789beF6e8ED93bEFD234334C8d1115"
let defaultPaymaster = "0xd0961c1Ce3c333040BA3630FC64Bf3ea84FeF1bf"
let deafultToken = "0x46aBf0F64103c8B08d6D8b4663261D83595fBE97"
let entryPointAddress = "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789"
        
let mySmartWalletAddress = "0x32480A1e937b7749a755793eA0F3D9607052a91A"
let myPublicWalletAddress = "0x199b0A98F87622bDB4B8Eaeb05171c86652dCa10"
        
let function = EthereumAbiFunction(name: "createAccount")
function.addParamAddress(val: Data (hexString: myPublicWalletAddress)!, isOutput: false)
function.addParamUInt256(val: Data(hexString: "00")!, isOutput: false)
        
let createAccountFuncEncoded = EthereumAbi.encode(fn: function)
let initCode = factoryAddress + createAccountFuncEncoded.hexString
        
let maxFeePerGas = "0x59818264"
let maxPriorityFeePerGas = "0x59682f00"
let gasLimit = "0x5454"
let verificationGasLimit = "0x05f997"
let preVerificationGas = "0x015bf0"
let nonce = "0x00"
let chainID = "0x0539"
let privateKey = "0x220b646d64f847d5c807fc37db2511b140406a8c1d4a3580b8b29ba980063dab"

let input = EthereumSigningInput.with {
            $0.chainID = Data(hexString: chainID)!
            $0.nonce = Data(hexString: nonce)!
            $0.maxFeePerGas = Data(hexString: maxFeePerGas)!
            $0.maxInclusionFeePerGas = Data(hexString: maxPriorityFeePerGas)!
            $0.txMode = .userOp
            $0.gasLimit = Data(hexString: gasLimit)!
            $0.privateKey = Data(hexString: privateKey)!
            $0.userOperation = EthereumUserOperation.with {
                $0.verificationGasLimit = Data(hexString: verificationGasLimit)!
                $0.preVerificationGas = Data(hexString: preVerificationGas)!
                $0.entryPoint = entryPointAddress
                $0.sender = mySmartWalletAddress
                $0.initCode = Data(hexString: initCode)!
                $0.paymasterAndData = Data(hexString: defaultPaymaster)!
            }
        }`

let output: EthereumSigningOutput = AnySigner.sign(input: input, coin: .ethereum) 
let jsonString = String(data: output.encoded, encoding: .utf8) ?? ""
print(jsonString)

JSON result:

{"callData":"0xb61d27f60000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000000","callGasLimit":"21588","initCode":"0x40154c8909789bef6e8ed93befd234334c8d11155fbfb9cf000000000000000000000000199b0a98f87622bdb4b8eaeb05171c86652dca100000000000000000000000000000000000000000000000000000000000000000","maxFeePerGas":"1501659748","maxPriorityFeePerGas":"1500000000","nonce":"0","paymasterAndData":"0xd0961c1ce3c333040ba3630fc64bf3ea84fef1bf","preVerificationGas":"89072","sender":"0x32480a1e937b7749a755793ea0f3d9607052a91a","signature":"0x81710570a173bbd96413e4558e5fed7adede220abd223dd87b665d3097b04f9b528fb32d1ee822db337117df5e58659f78ab2dff285750c15d0a29c5e0a678d71c","verificationGasLimit":"391575"}

API Call

{"method":"eth_sendUserOperation","params":[
{
  "callData" : "0xb61d27f60000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000000",
  "paymasterAndData" : "0xd0961c1ce3c333040ba3630fc64bf3ea84fef1bf",
  "preVerificationGas" : "0x015bf0",
  "maxPriorityFeePerGas" : "0x59682f00",
  "sender" : "0x32480a1e937b7749a755793ea0f3d9607052a91a",
  "signature" : "0x81710570a173bbd96413e4558e5fed7adede220abd223dd87b665d3097b04f9b528fb32d1ee822db337117df5e58659f78ab2dff285750c15d0a29c5e0a678d71c",
  "verificationGasLimit" : "0x05f997",
  "maxFeePerGas" : "0x59818264",
  "callGasLimit" : "0x5454",
  "initCode" : "0x40154c8909789bef6e8ed93befd234334c8d11155fbfb9cf000000000000000000000000199b0a98f87622bdb4b8eaeb05171c86652dca100000000000000000000000000000000000000000000000000000000000000000",
  "nonce" : "0x00"
},"0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789"],"id":44,"jsonrpc":"2.0"}

The expected valid signature should be
0x87239c9d96d1199f1b4bb1bb7804cd5c16ca2ba875c5767f802b938f209aa3ce289c08f44a9d0c09aa49aeee81ce1435a3153295163aca4902de6a9b557678a61c

I know the valid signature because I have a browser extension, that uses the @account-abstraction/contracts package.
This browser extension makes calls and I can debug and compile logs. All data is the same, except for the signature.

Maybe I missed some parameters when generation input? But pre-hash is the same and valid.

Thank you.

[DenisDemyanko]

@satoshiotomakan

Hello. Also, I try node lib. Same result.
I got a valid preHash but an invalid signature.
If I sign the hash via Ethereum lib I get a valid signature.

Signature from core-wallet - 0x6591fdd130a3dc87f3b09cd0fe55edae90ccce1e306dce51c648f1742026fdb52f3c6287c0912385852c524bfedff6d53fe76a2b7e8cb672e03de4f66b6237061b

Signature from ETH - 0xbc13fcd6f072acd8399356018999e730f0c108ac590f4f76900ec7637417d663138f422f75cd3a277a766d9482b18e6752343bcf8785356c7d1e27b5f1f82db01c

Prehash - 0x239e8ae401f75a59a655e782745966a9b8d559f57e02a581cf09516f019a4eac

import { TW } from "@trustwallet/wallet-core"
import { initWasm } from "@trustwallet/wallet-core"
import { ethers } from "ethers";

let func = async () => {
    const { AnySigner, CoinType, HexCoding } = await initWasm();

    const input = TW.Ethereum.Proto.SigningInput.create({
        txMode: TW.Ethereum.Proto.TransactionMode.UserOp,
        chainId: Buffer.from("0539", "hex"),
        nonce: Buffer.from("00", "hex"),
        maxFeePerGas: Buffer.from("596ffcba"  , "hex"),
        maxInclusionFeePerGas: Buffer.from("59682f00"  , "hex"),
        gasLimit: Buffer.from("5454", "hex"),
        userOperation: TW.Ethereum.Proto.UserOperation.create({
            entryPoint: "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789",
            initCode: Buffer.from("40154c8909789bef6e8ed93befd234334c8d11155fbfb9cf00000000000000000000000094d773ecc236473bb2cccc3d7b4f1731e1f305980000000000000000000000000000000000000000000000000000000000000000", "hex"),
            sender: "0x20c008674D5e1AFde073A2A51A4A960107e3c9D7",
            preVerificationGas: Buffer.from("015bf0", "hex"),
            verificationGasLimit: Buffer.from("05f997", "hex"),
            paymasterAndData: Buffer.from("d0961c1Ce3c333040BA3630FC64Bf3ea84FeF1bf", "hex")
        }),
        privateKey: HexCoding.decode(
          "0xb9db2151034c6b6604d6aaf86ef0852e5c662a456b2365aab389714d03e9168e"
        ),
      });

      input.txMode = TW.Ethereum.Proto.TransactionMode.UserOp
    
      const encoded = TW.Ethereum.Proto.SigningInput.encode(input).finish();
      const outputData = AnySigner.sign(encoded, CoinType.ethereum);
      const output = TW.Ethereum.Proto.SigningOutput.decode(outputData);
      console.log(String.fromCharCode(...output.encoded))
      console.log(HexCoding.encode(output.preHash))

      let wallet = new ethers.Wallet("0xb9db2151034c6b6604d6aaf86ef0852e5c662a456b2365aab389714d03e9168e")

      let res = await wallet.signMessage(output.preHash)
      console.log(res)

} 

func()

[satoshiotomakan]

As I can see, you provide different private keys:

let wallet = new ethers.Wallet("0xb9db2151034c6b6604d6aaf86ef0852e5c662a456b2365aab389714d03e9168e")

let privateKey = "0x220b646d64f847d5c807fc37db2511b140406a8c1d4a3580b8b29ba980063dab"

Cat it be the reason?

[DenisDemyanko]

@satoshiotomakan No, because the code from Swift and TypeScript uses different private keys. It's okay.
The main problem or question for example (TypeScript code above this post) is that signatures generated from TW and ETH are different. The pre-hash is valid. If I sign the pre-hash with an ETH wallet, I get a valid signature that works.
The signature created via TW not working and I get an error - "message": "Invalid UserOp signature or paymaster signature"

let wallet = new ethers.Wallet("0xb9db2151034c6b6604d6aaf86ef0852e5c662a456b2365aab389714d03e9168e")
let res = await wallet.signMessage(output.preHash)

I provided TypeScript code, so you can run in the terminal and see signatures that return from TW and ETH.
TW_TEST.zip

- yarn
- yarn run start

Result:

`OUTPUT TW:
{"callData":"0xb61d27f60000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000000","callGasLimit":"21588","initCode":"0x40154c8909789bef6e8ed93befd234334c8d11155fbfb9cf00000000000000000000000094d773ecc236473bb2cccc3d7b4f1731e1f305980000000000000000000000000000000000000000000000000000000000000000","maxFeePerGas":"1500511418","maxPriorityFeePerGas":"1500000000","nonce":"0","paymasterAndData":"0xd0961c1ce3c333040ba3630fc64bf3ea84fef1bf","preVerificationGas":"89072","sender":"0x20c008674d5e1afde073a2a51a4a960107e3c9d7","signature":"0x6591fdd130a3dc87f3b09cd0fe55edae90ccce1e306dce51c648f1742026fdb52f3c6287c0912385852c524bfedff6d53fe76a2b7e8cb672e03de4f66b6237061b","verificationGasLimit":"391575"}

PRE-HASH TW:0x239e8ae401f75a59a655e782745966a9b8d559f57e02a581cf09516f019a4eac

SIGANTURE FROM ETH: 0xbc13fcd6f072acd8399356018999e730f0c108ac590f4f76900ec7637417d663138f422f75cd3a277a766d9482b18e6752343bcf8785356c7d1e27b5f1f82db01c`