X509EnhancedKeyUsageExtension.cs

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using Internal.Cryptography.Pal;
 
namespace System.Security.Cryptography.X509Certificates;
 
public sealed class X509EnhancedKeyUsageExtension : X509Extension
{
    private OidCollection _enhancedKeyUsages;
 
    private bool _decoded;
 
    public OidCollection EnhancedKeyUsages
    {
        get
        {
            if (!_decoded)
            {
                X509Pal.Instance.DecodeX509EnhancedKeyUsageExtension(base.RawData, out _enhancedKeyUsages);
                _decoded = true;
            }
            OidCollection oidCollection = new OidCollection();
            OidEnumerator enumerator = _enhancedKeyUsages.GetEnumerator();
            while (enumerator.MoveNext())
            {
                Oid current = enumerator.Current;
                oidCollection.Add(current);
            }
            return oidCollection;
        }
    }
 
    public X509EnhancedKeyUsageExtension()
        : base(System.Security.Cryptography.Oids.EnhancedKeyUsageOid)
    {
        _enhancedKeyUsages = new OidCollection();
        _decoded = true;
    }
 
    public X509EnhancedKeyUsageExtension(AsnEncodedData encodedEnhancedKeyUsages, bool critical)
        : base(System.Security.Cryptography.Oids.EnhancedKeyUsageOid, encodedEnhancedKeyUsages.RawData, critical)
    {
    }
 
    public X509EnhancedKeyUsageExtension(OidCollection enhancedKeyUsages, bool critical)
        : base(System.Security.Cryptography.Oids.EnhancedKeyUsageOid, EncodeExtension(enhancedKeyUsages), critical)
    {
    }
 
    public override void CopyFrom(AsnEncodedData asnEncodedData)
    {
        base.CopyFrom(asnEncodedData);
        _decoded = false;
    }
 
    private static byte[] EncodeExtension(OidCollection enhancedKeyUsages)
    {
        if (enhancedKeyUsages == null)
        {
            throw new ArgumentNullException("enhancedKeyUsages");
        }
        return X509Pal.Instance.EncodeX509EnhancedKeyUsageExtension(enhancedKeyUsages);
    }
}