public SSUHeader(BufRef writer, MessageTypes msgtype) { MAC = writer.ReadBufLen(16); IV = writer.ReadBufLen(16); IV.Randomize(); FlagBuf = writer.ReadBufLen(1); MessageType = msgtype; TimeStampBuf = writer.ReadBufLen(4); TimeStamp = SSUHost.SSUTime(DateTime.UtcNow); }
private void SendUnfragmentedSessionConfirmed() { var ri = new BufLen(Session.MyRouterContext.MyRouterInfo.ToByteArray()); SendMessage( SSUHeader.MessageTypes.SessionConfirmed, Session.MACKey, Session.SharedKey, (start, writer) => { writer.Write8((byte)((0 << 4) + 1)); writer.WriteFlip16((ushort)ri.Length); writer.Write(ri); Session.SignOnTimeA = BufUtils.Flip32(SSUHost.SSUTime(DateTime.UtcNow)); writer.Write32(Session.SignOnTimeA); var padding = BufUtils.Get16BytePadding(Session.MyRouterContext.Certificate.SignatureLength + (writer - start)); writer.Write(BufUtils.RandomBytes(padding)); var baddr = new BufLen(Session.RemoteEP.Address.GetAddressBytes()); var bport = BufUtils.Flip16BL((ushort)Session.RemoteEP.Port); #if LOG_MUCH_TRANSPORT Logging.LogTransport($"SSU {this}: X for signature {Request.X.Key}."); Logging.LogTransport($"SSU {this}: Y for signature {Request.Y.Key}."); Logging.LogTransport($"SSU {this}: Alice address for signature {Request.SCMessage.Address}. Port {Request.SCMessage.Port}."); Logging.LogTransport($"SSU {this}: Bob address for signature {baddr}. Port {bport}."); Logging.LogTransport($"SSU {this}: Relay tag {Request.SCMessage.RelayTag}. Signon time {(BufLen)Session.SignOnTimeA}."); #endif var sign = I2PSignature.DoSign(Session.MyRouterContext.PrivateSigningKey, Request.X.Key, Request.Y.Key, Request.SCMessage.Address, Request.SCMessage.Port, baddr, bport, Request.SCMessage.RelayTag, BufUtils.To32BL(Session.SignOnTimeA) ); writer.Write(sign); Logging.LogTransport($"SSU {this}: {Session.RemoteEP} " + $"sending unfragmented SessionConfirmed [0x{writer - start - SSUHeader.FIXED_HEADER_SIZE:X}] bytes."); return(true); }); }
private void SendSessionCreated() { SendMessage( SSUHeader.MessageTypes.SessionCreated, Session.MyRouterContext.IntroKey, Session.MyRouterContext.IntroKey, (start, writer) => { writer.Write(Y.Key); AAddr = Session.RemoteEP.Address.GetAddressBytes(); writer.Write8((byte)AAddr.Length); writer.Write(AAddr); APort = BufUtils.Flip16((ushort)Session.RemoteEP.Port); writer.Write16(APort); writer.WriteFlip32(RelayTag); Session.SignOnTimeB = BufUtils.Flip32(SSUHost.SSUTime(DateTime.UtcNow)); writer.Write32(Session.SignOnTimeB); var sign = I2PSignature.DoSign(Session.MyRouterContext.PrivateSigningKey, Request.X, Y.Key, new BufLen(AAddr), BufUtils.To16BL(APort), Request.Address, BufUtils.Flip16BL((ushort)Session.MyRouterContext.UDPPort), BufUtils.To32BL(RelayTag), BufUtils.To32BL(Session.SignOnTimeB)); var signstart = new BufLen(writer); writer.Write(sign); var padding = BufUtils.Get16BytePadding(writer - signstart); writer.Write(BufUtils.RandomBytes(padding)); var cipher = new CbcBlockCipher(new AesEngine()); var signcryptbuf = new BufLen(signstart, 0, writer - signstart); cipher.Init(true, Session.SharedKey.ToParametersWithIV(new BufLen(start, 16, 16))); cipher.ProcessBytes(signcryptbuf); return(true); }); }
private void SendFragmentedSessionConfirmed() { var ri = new BufLen(Session.MyRouterContext.MyRouterInfo.ToByteArray()); var rireader = new BufRefLen(ri); var datafragments = new List <BufLen>(); while (rireader.Length > 0) { datafragments.Add(rireader.ReadBufLen(Math.Min(rireader.Length, 472))); } for (int i = 0; i < datafragments.Count; ++i) { Logging.LogTransport($"SSU {this}: {Session.RemoteEP} " + $"sending fragment {i + 1} of {datafragments.Count + 1}, [0x{datafragments[i].Length:X}] bytes."); SendMessage( SSUHeader.MessageTypes.SessionConfirmed, Session.MACKey, Session.SharedKey, (start, writer) => { writer.Write8((byte)((i << 4) + datafragments.Count + 1)); writer.WriteFlip16((ushort)datafragments[i].Length); writer.Write(datafragments[i]); return(true); }); } SendMessage( SSUHeader.MessageTypes.SessionConfirmed, Session.MACKey, Session.SharedKey, (start, writer) => { var frag = datafragments.Count; writer.Write8((byte)((frag << 4) + frag + 1)); writer.WriteFlip16(0); Session.SignOnTimeA = BufUtils.Flip32(SSUHost.SSUTime(DateTime.UtcNow)); writer.Write32(Session.SignOnTimeA); var padding = BufUtils.Get16BytePadding(Session.MyRouterContext.Certificate.SignatureLength + (writer - start)); writer.Write(BufUtils.RandomBytes(padding)); var baddr = new BufLen(Session.RemoteEP.Address.GetAddressBytes()); var sign = I2PSignature.DoSign(Session.MyRouterContext.PrivateSigningKey, Request.X.Key, Request.Y.Key, Request.SCMessage.Address, Request.SCMessage.Port, baddr, BufUtils.Flip16BL((ushort)Session.RemoteEP.Port), Request.SCMessage.RelayTag, BufUtils.To32BL(Session.SignOnTimeA) ); writer.Write(sign); Logging.LogTransport($"SSU {this}: {Session.RemoteEP} " + $"sending fragment {frag + 1} of {datafragments.Count + 1}, [0x{writer - start - SSUHeader.FIXED_HEADER_SIZE:X}] bytes."); return(true); }); }