Metamask Verification: Securely Verifying Signed Messages in C

Applications

As a developer working with blockchain technology, you are probably familiar with the importance of secure communication and data integrity. In this article, we will learn how to verify signed messages from a C

backend application using Metamask.

What is Metamask?

Metamask is a popular browser extension that allows users to interact with Web3 platforms, including Ethereum, without requiring an internet connection. It allows developers to build decentralized applications (dApps) and access various blockchain features through its API.

Verifying Signed Messages Using Metamask in C#

When building a single-page application using C#, you can use MetaMask’s WebAssembly module (WASM) to verify signed messages. This approach offers several advantages, including:

• Decoupling: The WASM module is not tightly coupled to the underlying browser environment, allowing for greater flexibility and control.

• Security: By using a standalone module, you can ensure that your C
  

  application remains secure even if the MetaMask API is compromised or blocked.

Here is an example of verifying signed messages from a C

backend application:

using system;
using System.Web.Http;
// Define your own message signing and verification function
public static class MessageSigner
{
public static (String, String) SignMessage(String message)
{
// Replace with your own message signing logic
// For demonstration purposes, we'll use a simple HMAC-based approach
var key = "YOUR_SECRET_KEY";
var hmac = new HMACSHA256(key);
var signature = hmac.ComputeHash(Encoding.UTF8.GetBytes(message));
return (signature, BitConverter.ToString(signature).Replace("-", ""));
}
public static string VerifySignature(messageString, signatureString)
{
// Replace with your own validation logic
// For demonstration purposes, we will use a simple approach to verify a digital signature
var key = "YOUR_SECRET_KEY";
var hmac = new HMACSHA256(key);
return hmac.ComputeHash(Encoding.UTF8.GetBytes(message)) == Encoding.UTF8.GetBytes(signature);
}
}
// Define a controller action that verifies signed messages
[HttpPost]
public class SignedMessageValidator : HttpResponseBase
{
[HttpPost("validate")]
public bool ValidateSignedMessage(MessageString, SignatureString)
{
// Extract the signed message from the request body
var signatureMessage = MessageSigner.SignMessage(message);
// Verify the signed message using the Metamask API
if (MessageSigner.VerifySignature(signedMessage.Item1, signatureMessage.Item2))
{
return true;
}
else
{
return false;
}
}
}

Example Usage

To test the action of the SignedMessageValidator controller, you can use a tool like Postman or cURL. Here is an example request:

Authentication POST /HTTP/1.1
Content-Type: application/json
{
"message": "Message actually signed"
}

The server responds with a success status code if the signed message is valid, and with a failure status code otherwise.

Conclusion

By using Metamask’s WASM module to verify signed messages in your C

applications, you can ensure secure communication and data integrity. This approach provides a flexible and decoupled way to build decentralized applications, allowing developers to focus on building innovative blockchain features without worrying about the complexity of the underlying infrastructure.

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