using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Numerics; using Square; using System.Globalization; namespace CircleScape.Encryption { class Key { private BigInteger Secret; public BigInteger Generator { get; private set; } = 2; public BigInteger Modulus { get; private set; } public BigInteger PrivateKey { get; private set; } = BigInteger.Zero; public bool Succeeded { get => !PrivateKey.IsZero; } public Key() { Secret = RNG.NextPrime(512 / 8); Modulus = RNG.NextPrime(512 / 8); } public Packet GenerateRequestPacket() { return new Packet( Packet.kId.KeyExchange, Generator.ToHexString(), Modulus.ToHexString(), BigInteger.ModPow(Generator, Secret, Modulus).ToHexString() ); } public BigInteger ParseResponsePacket(Packet packet) { if(packet.Id != Packet.kId.KeyExchange || packet.RegionCount != 1) return -1; if(!BigInteger.TryParse(packet[0], NumberStyles.HexNumber, NumberFormatInfo.InvariantInfo, out BigInteger ClientKey)) return -1; return (PrivateKey = BigInteger.ModPow(ClientKey, Secret, Modulus)); } } }