EcRecover签名消息与PublicAddress不匹配

Question

我正在尝试创建一个C# webservice后端API，它处理在步骤5中找到的代码逻辑：https://www.toptal.com/ethereum/one-click-login-flows-a-metamask-tutorial

他们的代码如下所示：

User.findOne({ where: { publicAddress } })
  // --snip--
  .then(user => {
    const msg = `I am signing my one-time nonce: ${user.nonce}`;

    // We now are in possession of msg, publicAddress and signature. We
    // can perform an elliptic curve signature verification with ecrecover
    const msgBuffer = ethUtil.toBuffer(msg);
    const msgHash = ethUtil.hashPersonalMessage(msgBuffer);
    const signatureBuffer = ethUtil.toBuffer(signature);
    const signatureParams = ethUtil.fromRpcSig(signatureBuffer);
    const publicKey = ethUtil.ecrecover(
      msgHash,
      signatureParams.v,
      signatureParams.r,
      signatureParams.s
    );
    const addressBuffer = ethUtil.publicToAddress(publicKey);
    const address = ethUtil.bufferToHex(addressBuffer);

    // The signature verification is successful if the address found with
    // ecrecover matches the initial publicAddress
    if (address.toLowerCase() === publicAddress.toLowerCase()) {
      return user;
    } else {
      return res
        .status(401)
        .send({ error: 'Signature verification failed' });
    }
  })

我的代码如下所示。但它总是返回假的。我最初的猜测是，“消息”格式在某种程度上是不正确的。我已经看到了其他示例，不包括"\x19“部分，而是删除它并包含它都返回false。

public static bool AccountSignerIsValid(string signature, string publicAddress)
{
    var nonce = "12345678";
    var terms = "Please sign to log in: " + nonce;
    var message = Encoding.UTF8.GetBytes("\x19Ethereum Signed Message:\n" + terms.Length + terms);
    var hash = (new Sha3Keccack()).CalculateHash(message.ToArray());

    var signer = new Nethereum.Signer.MessageSigner();
    var account = signer.EcRecover(hash, signature);

    return (account.ToLower().Equals(publicAddress.ToLower()));
}

要更改C#代码以使其返回为真，我需要做什么？

Answer 1

//  ("\x19Ethereum")  !=  ("\x19" + "Ethereum")
var message = Encoding.UTF8.GetBytes("\x19" + "Ethereum Signed Message:\n" + terms.Length + terms);

Answer 2

对于到达这里的其他人，有一个build in函数，负责编码、散列、验证和构建字符串：

var recoveredAddress = signer.EncodeUTF8AndEcRecover(message, signature);

只需注意，恢复的地址是混合大小写(构建在校验和中)，所以IgnoreCase比较或小写两者都是。