init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/X509/X509ExtensionBase.cs

@@ -0,0 +1,62 @@
+using System;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.X509;
+
+public abstract class X509ExtensionBase : IX509Extension
+{
+	protected abstract X509Extensions GetX509Extensions();
+
+	protected virtual ISet GetExtensionOids(bool critical)
+	{
+		X509Extensions x509Extensions = GetX509Extensions();
+		if (x509Extensions != null)
+		{
+			HashSet hashSet = new HashSet();
+			{
+				foreach (DerObjectIdentifier extensionOid in x509Extensions.ExtensionOids)
+				{
+					X509Extension extension = x509Extensions.GetExtension(extensionOid);
+					if (extension.IsCritical == critical)
+					{
+						hashSet.Add(extensionOid.Id);
+					}
+				}
+				return hashSet;
+			}
+		}
+		return null;
+	}
+
+	public virtual ISet GetNonCriticalExtensionOids()
+	{
+		return GetExtensionOids(critical: false);
+	}
+
+	public virtual ISet GetCriticalExtensionOids()
+	{
+		return GetExtensionOids(critical: true);
+	}
+
+	[Obsolete("Use version taking a DerObjectIdentifier instead")]
+	public Asn1OctetString GetExtensionValue(string oid)
+	{
+		return GetExtensionValue(new DerObjectIdentifier(oid));
+	}
+
+	public virtual Asn1OctetString GetExtensionValue(DerObjectIdentifier oid)
+	{
+		X509Extensions x509Extensions = GetX509Extensions();
+		if (x509Extensions != null)
+		{
+			X509Extension extension = x509Extensions.GetExtension(oid);
+			if (extension != null)
+			{
+				return extension.Value;
+			}
+		}
+		return null;
+	}
+}