X509KeyUsageExtension.cs

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using Internal.Cryptography.Pal;
 
namespace System.Security.Cryptography.X509Certificates;
 
public sealed class X509KeyUsageExtension : X509Extension
{
    private bool _decoded;
 
    private X509KeyUsageFlags _keyUsages;
 
    public X509KeyUsageFlags KeyUsages
    {
        get
        {
            if (!_decoded)
            {
                X509Pal.Instance.DecodeX509KeyUsageExtension(base.RawData, out _keyUsages);
                _decoded = true;
            }
            return _keyUsages;
        }
    }
 
    public X509KeyUsageExtension()
        : base(System.Security.Cryptography.Oids.KeyUsageOid)
    {
        _decoded = true;
    }
 
    public X509KeyUsageExtension(AsnEncodedData encodedKeyUsage, bool critical)
        : base(System.Security.Cryptography.Oids.KeyUsageOid, encodedKeyUsage.RawData, critical)
    {
    }
 
    public X509KeyUsageExtension(X509KeyUsageFlags keyUsages, bool critical)
        : base(System.Security.Cryptography.Oids.KeyUsageOid, X509Pal.Instance.EncodeX509KeyUsageExtension(keyUsages), critical)
    {
    }
 
    public override void CopyFrom(AsnEncodedData asnEncodedData)
    {
        base.CopyFrom(asnEncodedData);
        _decoded = false;
    }
}