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

namespace FishGameService.Utils
{
    public static class SignHelper
    {
        public static string Sign(string rawStr, string signKey)
        {
            var input = rawStr + "|" + signKey;
            var hash = MD5.HashData(Encoding.UTF8.GetBytes(input));
            return Convert.ToHexString(hash).Substring(0, 8).ToLower();
        }

        public static bool Verify(string rawStr, string signKey, string expectedSign)
        {
            if (string.IsNullOrWhiteSpace(expectedSign))
                return false;
            var computed = Sign(rawStr, signKey);
            return computed == expectedSign;
        }
    }
}