using System;
namespace ln.identities
{
    public abstract class SecureAttribute
    {
        static public Random Random { get; } = new Random();

        public Guid UniqueID { get; private set; }
        public String Label { get; set; }

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

        protected SecureAttribute()
        {
            UniqueID = Guid.NewGuid();
        }
        protected SecureAttribute(String label)
            :this()
        {
            Label = label;
        }

        public abstract String GetAuthenticationParameters();
        public abstract bool Authenticate(byte[] challenge, byte[] prove);

        public virtual byte[] CreateChallenge()
        {
            Challenge = new byte[32];
            Random.NextBytes(Challenge);
            return Challenge;
        }

        public string GetAttributeTypeName() => this.GetType().Name;

    }
}