using System.Security;
using DSInternals.Common.Cryptography;

namespace DSInternals.Common.Data;

// https://msdn.microsoft.com/en-us/library/cc941809.aspx
public class KerberosKeyData
{
    // Size: Reserved1 (2 bytes) + Reserved2 (2 bytes) + Reserved3 (4 bytes) + KeyType (4 bytes) + KeyLength (4 bytes) + KeyOffset (4 bytes)
    internal const int StructureSize = sizeof(short) + sizeof(short) + sizeof(int) + sizeof(KerberosKeyType) + sizeof(int) + sizeof(int);

    public KerberosKeyData(KerberosKeyType keyType, byte[] key)
    {
        ArgumentNullException.ThrowIfNull(key);
        this.KeyType = keyType;
        this.Key = key;
    }

    public KerberosKeyData(KerberosKeyType type, SecureString password, string salt)
    {
        ArgumentNullException.ThrowIfNull(password);
        ArgumentNullException.ThrowIfNull(salt);

        this.KeyType = type;
        this.Key = KerberosKeyDerivation.DeriveKey(type, password, salt);
    }

    public KerberosKeyType KeyType
    {
        get;
        private set;
    }

    public byte[] Key
    {
        get;
        private set;
    }

    public override string ToString()
    {
        return $"Type: {this.KeyType}, Key: {this.Key.ToHex()}";
    }
}