/// <summary>
/// Decrypts and deserializes a message from a byte buffer.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="sharedKey">The shared encryption key.</param>
/// <exception cref="FormatException">Thrown if the buffer does not contain a valid message.</exception>
public DynDnsMessage(byte[] buffer, SymmetricKey sharedKey)
{
try
{
using (var ms = new EnhancedMemoryStream(Crypto.Decrypt(buffer, sharedKey)))
{
if (ms.ReadInt32Le() != Magic)
{
throw new Exception();
}
this.Version = ms.ReadByte();
if (this.Version < FormatVer)
{
throw new FormatException(string.Format("DynDnsMessage version [{0}] is not supported.", this.Version));
}
this.TimeStampUtc = new DateTime(ms.ReadInt64Le());
this.Flags = (DynDnsMessageFlag)ms.ReadInt32Le();
this.HostEntry = new DynDnsHostEntry(ms.ReadString16());
}
}
catch (Exception e)
{
throw new FormatException("Invalid Dynamic DNS message.", e);
}
}
/// <summary>
/// Decrypts and deserializes a message from a byte buffer.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="sharedKey">The shared encryption key.</param>
/// <exception cref="FormatException">Thrown if the buffer does not contain a valid message.</exception>
public UdpBroadcastMessage(byte[] buffer, SymmetricKey sharedKey)
{
try
{
using (var ms = new EnhancedMemoryStream(Crypto.Decrypt(buffer, sharedKey)))
{
if (ms.ReadInt32Le() != Magic)
{
throw new Exception();
}
this.TimeStampUtc = new DateTime(ms.ReadInt64Le());
this.SourceAddress = new IPAddress(ms.ReadBytes(4));
this.MessageType = (UdpBroadcastMessageType)ms.ReadByte();
this.BroadcastGroup = ms.ReadByte();
this.Payload = ms.ReadBytes16();
}
}
catch (Exception e)
{
throw new FormatException("Invalid UDP broadcast message.", e);
}
}