// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace System.Security.Cryptography.X509Certificates
{
    public sealed class X509KeyUsageExtension : X509Extension
    {
        public X509KeyUsageExtension()
            : base(Oids.KeyUsageOid)
        {
            _decoded = true;
        }
 
        public X509KeyUsageExtension(AsnEncodedData encodedKeyUsage, bool critical)
            : base(Oids.KeyUsageOid, encodedKeyUsage.RawData, critical)
        {
        }
 
        public X509KeyUsageExtension(X509KeyUsageFlags keyUsages, bool critical)
            : base(Oids.KeyUsageOid, X509Pal.Instance.EncodeX509KeyUsageExtension(keyUsages), critical, skipCopy: true)
        {
        }
 
        public X509KeyUsageFlags KeyUsages
        {
            get
            {
                if (!_decoded)
                {
                    X509Pal.Instance.DecodeX509KeyUsageExtension(RawData, out _keyUsages);
                    _decoded = true;
                }
                return _keyUsages;
            }
        }
 
        public override void CopyFrom(AsnEncodedData asnEncodedData)
        {
            base.CopyFrom(asnEncodedData);
            _decoded = false;
        }
 
        private bool _decoded;
        private X509KeyUsageFlags _keyUsages;
    }
}