public byte[] BuildAu2Packet()
{
var frame = new MaslAu2Frame(_rsspEndPoint.LocalEquipType, _rsspEndPoint.LocalID,
EncryptionAlgorithm.TripleDES, _macCalc.RandomA);
frame.MAC = this.CalcAu2MAC(frame, _rsspEndPoint.RemoteID);
return(frame.GetBytes());
}
public override void HandleAu2Frame(MaslAu2Frame au2Frame)
{
if (au2Frame.EncryAlgorithm != EncryptionAlgorithm.TripleDES)
{
throw new SafetyFeatureNotSupportedException();
}
var expectedDir = MaslFrameDirection.Server2Client;
if (au2Frame.Direction != expectedDir)
{
throw new DirectionFlagException(expectedDir);
}
var expectedId = this.Context.RsspEP.RemoteID & 0xFFFFFF;
if (au2Frame.ServerID != expectedId)
{
throw new IdentifyInAu2Exception(string.Format("AU2中无效的CTCS ID，期望值={0}（0x{0:X2}），实际值={1}（0x{1:X2}）。",
expectedId, au2Frame.ServerID));
}
// 更新远程设备（被动方）类型。
this.Context.RsspEP.RemoteEquipType = au2Frame.DeviceType;
// 更新RandomA
this.Context.MacCalculator.RandomA = au2Frame.RandomA;
// 初始化Mac计算器。
this.Context.MacCalculator.UpdateSessionKeys();
// 验证MAC。
var actualMac = au2Frame.MAC;
var expectedMac = this.Context.AuMessageMacCalculator.CalcAu2MAC(au2Frame, this.Context.RsspEP.LocalID);
if (!ArrayHelper.Equals(expectedMac, actualMac))
{
throw new MacInAu2Exception(string.Format("Au2消息Mac检验失败，期望值={0}，实际值={1}",
HelperTools.ConvertToString(expectedMac),
HelperTools.ConvertToString(actualMac)));
}
// 发送AU3。
var au3Pkt = this.Context.AuMessageBuilder.BuildAu3Packet();
this.Context.AleConnection.SendUserData(au3Pkt);
// 启动握手计时器，等待AR
this.Context.StartHandshakeTimer();
// 设置下一个状态。
this.Context.CurrentState = new MaslWaitingforArState(this.Context);
}
public void Test1()
{
var randomA = new byte[] { 0x1f, 0xd3, 0xa1, 0xce, 0x7b, 0x87, 0xe9, 0xb0 };
var mac = new byte[] { 0xA6, 0x86, 0x33, 0x93, 0xb9, 0x3B, 0x51, 0x0D };
var frame1 = new MaslAu2Frame(5, 0x8AC001, EncryptionAlgorithm.TripleDES, randomA);
frame1.MAC = mac;
var bytes = frame1.GetBytes();
var frame2 = new MaslAu2Frame();
frame2.ParseBytes(bytes, 0, bytes.Length);
Assert.AreEqual(frame1.ServerID, frame2.ServerID);
Assert.AreEqual(frame1.DeviceType, frame2.DeviceType);
Assert.AreEqual(frame1.Direction, frame2.Direction);
Assert.AreEqual(frame1.EncryAlgorithm, frame2.EncryAlgorithm);
Assert.AreEqual(frame1.FrameType, frame2.FrameType);
CollectionAssert.AreEqual(frame1.RandomA, frame2.RandomA);
CollectionAssert.AreEqual(frame1.MAC, frame2.MAC);
}
public byte[] CalcAu2MAC(MaslAu2Frame frame, uint destAddress)
{
using (var memStream = new MemoryStream(30))
{
// L
memStream.WriteByte(0x00);
memStream.WriteByte(0x1B);
// DA
memStream.WriteByte((byte)((destAddress >> 16) & 0xFF));
memStream.WriteByte((byte)((destAddress >> 8) & 0xFF));
memStream.WriteByte((byte)((destAddress) & 0xFF));
// ETY+MTI+DF
memStream.WriteByte(frame.GetHeaderByte());
// SA
memStream.WriteByte((byte)((frame.ServerID >> 16) & 0xFF));
memStream.WriteByte((byte)((frame.ServerID >> 8) & 0xFF));
memStream.WriteByte((byte)((frame.ServerID) & 0xFF));
// SaF
memStream.WriteByte((byte)frame.EncryAlgorithm);
// RA + RB
memStream.Write(_macCalc.RandomA, 0, _macCalc.RandomA.Length);
memStream.Write(_macCalc.RandomB, 0, _macCalc.RandomB.Length);
// DA
memStream.WriteByte((byte)((destAddress >> 16) & 0xFF));
memStream.WriteByte((byte)((destAddress >> 8) & 0xFF));
memStream.WriteByte((byte)((destAddress) & 0xFF));
var mac = _macCalc.CalcMac(memStream.ToArray());
return(mac);
}
}
public override void HandleAu2Frame(MaslAu2Frame frame)
{
throw new SequenceIntegrityException();
}
public override void HandleAu2Frame(MaslAu2Frame frame)
{
throw new NotArObtainedAfterAu3Exception();
}
public override void HandleAu2Frame(MaslAu2Frame frame)
{
throw new MaslException(MaslErrorCode.SequenceIntegrityFailure);
}
public virtual void HandleAu2Frame(MaslAu2Frame frame)
{
LogUtility.Error(string.Format("{0}: {1}.{2} not implement!",
this.Context.RsspEP.ID, this.GetType().Name,
new StackFrame(0).GetMethod().Name.Split('.').Last()));
}
