/// <summary>
/// Encrypt the command message
/// </summary>
/// <param name="pMessage">Message</param>
/// <param name="pProtocolType">Protocol type</param>
/// <returns>Returns the encrypted bytes of the message</returns>
internal static byte[] EncryptMessage(byte[] pMessage, HS100.ProtocolType pProtocolType)
{
List <byte> mBuffer = new List <byte>();
int key = 0xAB;
if ((pMessage != null) && (pMessage.Length > 0))
{
//Añadimos el prefijo del mensaje
if (pProtocolType == HS100.ProtocolType.TCP)
{
mBuffer.Add(0x00);
mBuffer.Add(0x00);
mBuffer.Add(0x00);
mBuffer.Add(0x00);
}
//Codificamos el mensaje
for (int i = 0; i < pMessage.Length; i++)
{
byte b = (byte)(key ^ pMessage[i]);
key = b;
mBuffer.Add(b);
}
}
return(mBuffer.ToArray());
}
/// <summary>
/// Decrypt the message
/// </summary>
/// <param name="pMessage">Message</param>
/// <param name="pProtocolType">Protocol type</param>
/// <returns>Returns the decrypted message</returns>
internal static byte[] DecryptMessage(byte[] pMessage, HS100.ProtocolType pProtocolType)
{
List <byte> mBuffer = new List <byte>();
int key = 0xAB;
//Skip the first 4 bytes in TCP communications (4 bytes header)
byte header = (pProtocolType == HS100.ProtocolType.UDP) ? (byte)0x00 : (byte)0x04;
if ((pMessage != null) && (pMessage.Length > 0))
{
for (int i = header; i < pMessage.Length; i++)
{
byte b = (byte)(key ^ pMessage[i]);
key = pMessage[i];
mBuffer.Add(b);
}
}
return(mBuffer.ToArray());
}
