using System.Security.Cryptography;

namespace RsaKeyLoader;

public class KeyLoader
{
    public static string PathString =
        Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "auth-key");
    public static RSA GetGeneratedKey()
    {
        if (File.Exists(PathString))
        {
            return LoadKey(PathString);
        }
        else
        {
            Generate(PathString);
            return LoadKey(PathString);
        }
    }
    
    public static void Generate(string path)
    {
        var rsaKey = RSA.Create();
        var privateKey = rsaKey.ExportRSAPrivateKey();
        File.WriteAllBytes(path, privateKey);
    }

    public static RSA LoadKey(string path)
    {
        var rsaKey = RSA.Create();
        rsaKey.ImportRSAPrivateKey(File.ReadAllBytes(path), out _);
        return rsaKey;
    }
}