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.Random(padding)); var baddr = new BufLen(Session.RemoteEP.Address.GetAddressBytes()); var bport = BufUtils.Flip16BL((ushort)Session.RemoteEP.Port); #if LOG_ALL_TRANSPORT Logging.LogTransport(string.Format("SSU SessionConfirmedState {0}: X for signature {1}.", Session.DebugId, Request.X.Key)); Logging.LogTransport(string.Format("SSU SessionConfirmedState {0}: Y for signature {1}.", Session.DebugId, Request.Y.Key)); Logging.LogTransport(string.Format("SSU SessionConfirmedState {0}: Alice address for signature {1}. Port {2}.", Session.DebugId, Request.SCMessage.Address, Request.SCMessage.Port)); Logging.LogTransport(string.Format("SSU SessionConfirmedState {0}: Bob address for signature {1}. Port {2}.", Session.DebugId, baddr, bport)); Logging.LogTransport(string.Format("SSU SessionConfirmedState {0}: Relay tag {1}. Signon time {2}.", Session.DebugId, Request.SCMessage.RelayTag, (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, (BufLen)Session.SignOnTimeA ); writer.Write(sign); #if LOG_ALL_TRANSPORT Logging.LogTransport(string.Format("SessionConfirmedState {0}: sending unfragmented SessionConfirmed. {1} bytes [0x{1:X}].", Session.DebugId, writer - start - SSUHeader.FIXED_HEADER_SIZE)); #endif 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), (BufLen)APort, Request.Address, (BufLen)BufUtils.Flip16((ushort)Session.MyRouterContext.UDPPort), (BufLen)RelayTag, (BufLen)Session.SignOnTimeB); var signstart = new BufLen(writer); writer.Write(sign); var padding = BufUtils.Get16BytePadding(writer - signstart); writer.Write(BufUtils.Random(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) { #if LOG_ALL_TRANSPORT Logging.LogTransport(string.Format("SessionConfirmedState {0}: sending fragment {1} of {2}, {3} bytes [0x{3:X}].", Session.DebugId, i + 1, datafragments.Count + 1, datafragments[i].Length)); #endif 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.Random(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, (BufLen)Session.SignOnTimeA ); writer.Write(sign); #if LOG_ALL_TRANSPORT Logging.LogTransport(string.Format("SessionConfirmedState {0}: sending fragment {1} of {2}, {3} bytes [0x{3:X}].", Session.DebugId, frag + 1, datafragments.Count + 1, writer - start - SSUHeader.FIXED_HEADER_SIZE)); #endif return(true); }); }