ServerCryptogramData.cs

using System;
using OSDP.Net.Messages;
using OSDP.Net.Messages.SecureChannel;
 
namespace OSDP.Net.Model.CommandData;

public class ServerCryptogramData : CommandData
{
    public ServerCryptogramData(byte[] serverCryptogram, bool isDefaultKey)
    {
        ServerCryptogram = serverCryptogram ?? throw new ArgumentNullException(nameof(serverCryptogram));
        IsDefaultKey = isDefaultKey;
    }

    public byte[] ServerCryptogram { get; }

    public bool IsDefaultKey { get; }
    
    public override CommandType CommandType => CommandType.ServerCryptogram;

    public override byte Code => (byte)CommandType;

    public override bool IsSecurityInitialization => true;

    public override ReadOnlySpan<byte> SecurityControlBlock()
    {
        return new byte[]
        {
            0x03,
            (byte)SecurityBlockType.SecureConnectionSequenceStep3,
            (byte)(IsDefaultKey ? 0x00 : 0x01)
        };
    }

    public override byte[] BuildData()
    {
        return ServerCryptogram;
    }

    public static ServerCryptogramData ParseData(ReadOnlySpan<byte> data, ReadOnlySpan<byte> securityControlBlock)
    {
        return new ServerCryptogramData(data.ToArray(), securityControlBlock[2] == 0x01);
    }
}