Facebook实时更新:在C#中验证X-Hub-Signature SHA1签名

using System;
using System.Security.Cryptography;
using System.Text;

public class SignatureValidator
{
    public static bool ValidateSignature(string signature, string requestBody, string secret)
    {
        byte[] secretBytes = Encoding.UTF8.GetBytes(secret);
        byte[] requestBodyBytes = Encoding.UTF8.GetBytes(requestBody);

        using (HMACSHA1 hmac = new HMACSHA1(secretBytes))
        {
            byte[] hashBytes = hmac.ComputeHash(requestBodyBytes);
            string computedSignature = "sha1=" + BitConverter.ToString(hashBytes).Replace("-", "").ToLower();

            return signature.Equals(computedSignature);
        }
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        string signature = "X-Hub-Signature value from HTTP header";
        string requestBody = "Raw content of the HTTP request body";
        string secret = "Your secret key";

        bool isValid = SignatureValidator.ValidateSignature(signature, requestBody, secret);

        if (isValid)
        {
            Console.WriteLine("Signature is valid. Proceed with further processing.");
        }
        else
        {
            Console.WriteLine("Signature is invalid. Request may have been tampered with.");
        }
    }
}