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