TLSharp/TLSharp.Core/Auth/Authenticator.cs

using System.Threading.Tasks;
using TLSharp.Core.Network;

namespace TLSharp.Core.Auth
{
	public static class Authenticator
	{
		public static async Task<Step3_Response> DoAuthentication(TcpTransport transport)
		{
			var sender = new MtProtoPlainSender(transport);
			var step1 = new Step1_PQRequest();

			await sender.Send(step1.ToBytes());
			var step1Response = step1.FromBytes(await sender.Recieve());

			var step2 = new Step2_DHExchange();
			await sender.Send(step2.ToBytes(
				step1Response.Nonce,
				step1Response.ServerNonce,
				step1Response.Fingerprints,
				step1Response.Pq));

			var step2Response = step2.FromBytes(await sender.Recieve());

			var step3 = new Step3_CompleteDHExchange();
			await sender.Send(step3.ToBytes(
				step2Response.Nonce,
				step2Response.ServerNonce,
				step2Response.NewNonce,
				step2Response.EncryptedAnswer));

			var step3Response = step3.FromBytes(await sender.Recieve());

			return step3Response;
		}
	}
}