/// <summary>
/// Attempts to parse raw data into a structured packet
/// </summary>
/// <param name="buffer">Raw data to parse</param>
/// <param name="packet">Parsed packet</param>
/// <param name="count">The length of the packet in bytes</param>
/// <param name="index">The index into the buffer at which the packet begins</param>
/// <returns>True if parsing was successful, false if it is not.</returns>
internal static bool TryParse(byte[] buffer, int index, int count, out EapolKey packet)
{
try
{
if (count < MinimumParseableBytes)
{
packet = null;
return(false);
}
using (var ms = new MemoryStream(buffer, index, count, false))
{
using (var br = new BinaryReader(ms))
{
packet = new EapolKey();
packet.KeyDescriptorType = br.ReadByte();
packet.KeyInformation = ByteOrder.NetworkToHostOrder(br.ReadUInt16());
packet.KeyLength = ByteOrder.NetworkToHostOrder(br.ReadUInt16());
packet.ReplayCounter = br.ReadBytes(8);
packet.Nonce = br.ReadBytes(32);
packet.IV = br.ReadBytes(16);
packet.RSC = br.ReadBytes(8);
packet.ID = br.ReadBytes(8);
packet.MIC = br.ReadBytes(16);
packet.DataLen = ByteOrder.NetworkToHostOrder(br.ReadUInt16());
packet.Data = br.ReadBytes((int)(count - br.BaseStream.Position));
return(true);
}
}
}
catch (Exception)
{
packet = null;
return(false);
}
}
/// <summary>
/// Attempts to parse raw data into a structured packet
/// </summary>
/// <param name="buffer">Raw data to parse</param>
/// <param name="packet">Parsed packet</param>
/// <param name="count">The length of the packet in bytes</param>
/// <param name="index">The index into the buffer at which the packet begins</param>
/// <returns>True if parsing was successful, false if it is not.</returns>
internal static bool TryParse(byte[] buffer, int index, int count, out EapolKey packet)
{
try
{
if (count < MinimumParseableBytes)
{
packet = null;
return false;
}
using (var ms = new MemoryStream(buffer, index, count, false))
{
using (var br = new BinaryReader(ms))
{
packet = new EapolKey();
packet.KeyDescriptorType = br.ReadByte();
packet.KeyInformation = ByteOrder.NetworkToHostOrder(br.ReadUInt16());
packet.KeyLength = ByteOrder.NetworkToHostOrder(br.ReadUInt16());
packet.ReplayCounter = br.ReadBytes(8);
packet.Nonce = br.ReadBytes(32);
packet.IV = br.ReadBytes(16);
packet.RSC = br.ReadBytes(8);
packet.ID = br.ReadBytes(8);
packet.MIC = br.ReadBytes(16);
packet.DataLen = ByteOrder.NetworkToHostOrder(br.ReadUInt16());
packet.Data = br.ReadBytes((int)(count - br.BaseStream.Position));
return true;
}
}
}
catch (Exception)
{
packet = null;
return false;
}
}
/// <summary>
/// Attempts to parse raw data into a structured packet
/// </summary>
/// <param name="buffer">Raw data to parse</param>
/// <param name="packet">Parsed packet</param>
/// <param name="count">The length of the packet in bytes</param>
/// <param name="index">The index into the buffer at which the packet begins</param>
/// <returns>True if parsing was successful, false if it is not.</returns>
internal static bool TryParse(byte[] buffer, int index, int count, out IEEE802_1x packet)
{
try
{
if (count < MinimumParseableBytes)
{
packet = null;
return(false);
}
using (var ms = new MemoryStream(buffer, index, count, false))
{
using (var br = new BinaryReader(ms))
{
var version = br.ReadByte();
var type = br.ReadByte();
var bodyLength = ByteOrder.NetworkToHostOrder(br.ReadUInt16());
var payloadLength = Math.Min(bodyLength, (int)(count - br.BaseStream.Position));
packet = null;
switch (type)
{
case (byte)Types.EAPOL_KEY:
{
EapolKey payload;
if (EapolKey.TryParse(
buffer,
index + (int)br.BaseStream.Position,
payloadLength,
out payload))
{
packet = new IEEE802_1x <EapolKey> {
Payload = payload
};
}
}
break;
}
if (packet == null)
{
Generic payload;
Generic.TryParse(
buffer,
index + (int)br.BaseStream.Position,
(int)(count - br.BaseStream.Position),
out payload);
// This can never fail, so I'm not checking the output
packet = new IEEE802_1x <Generic> {
Payload = payload
};
}
packet.Version = version;
packet.Type = type;
packet.BodyLength = bodyLength;
return(true);
}
}
}
catch (Exception)
{
packet = null;
return(false);
}
}
