/// <summary>
/// Decrypts the given packet in-place.
/// </summary>
/// <remarks>
/// The array will be modified directly.
/// </remarks>
/// <param name="packet">The data to decrypt.</param>
public void Decrypt(byte[] packet)
{
lock (_decryptor)
{
_decryptor.Transform(packet);
CustomCrypto.Decrypt(packet);
}
}
/// <summary>
/// Encrypts a packet, constructs a header for it and packs them into a new array.
/// </summary>
/// <remarks>
/// The array given as the <paramref name="packetData"/> parameter is transformed in-place.
/// </remarks>
/// <param name="packetData">The packet data to encrypt and pack.</param>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="packetData"/> is <see langword="null"/>.
/// </exception>
/// <returns>an array with the encrypted packet and its header.</returns>
public byte[] EncryptAndPack(byte[] packetData)
{
Guard.NotNull(() => packetData, packetData);
int length = packetData.Length;
var rawData = new byte[length + 4];
lock (_encryptor)
{
byte[] header = ConstructHeader(length);
Buffer.BlockCopy(header, 0, rawData, 0, 4);
CustomCrypto.Encrypt(packetData);
_encryptor.Transform(packetData);
}
Buffer.BlockCopy(packetData, 0, rawData, 4, length);
return(rawData);
}
