bug: signMessage generates incorrect signature for Hex message

[moldy530]

Is there an existing issue for this?

• I have searched the existing issues

Package Version

0.3.39

Current Behavior

Currently, stringToBytes (used by hashMessage when signing a message) takes the string and UTF-8 encodes the string and converts it to a byte array. This is a problem when trying to interface with a SimpleAccount because the generated signature is not correct. The expected signature is an ERC-191 signed hash of the UserOp.

This was was only an issue after 0.3.17

Expected Behavior

I'd expect stringToBytes to check if the string is already a Hex and then just call hexToBytes instead of UTF-8 encoding the hex string.

Steps To Reproduce

// This is one of the test private keys in this repo
const ownerAccount = privateKeyToAccount(
    "0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80"
);

expect(
  await ownerAccount.signMessage({
    message: "0xa70d0af2ebb03a44dcd0714a8724f622e3ab876d0aa312f0ee04823285d6fb1b"
  })
).toBe("0x1a7fd732f926be0a1dbfd1b4acbd7a6f7198fda1ab5ef69ef027a2eee89987785d210298e12119a1d62b5a7d2d9f24d075682675ae00f51a5602e725f0d180851b")

Link to Minimal Reproducible Example (StackBlitz, CodeSandbox, GitHub repo etc.)

No response

Anything else?

No response