init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Asn1/X509/CertificatePair.cs

@@ -0,0 +1,71 @@
+using System;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1.X509;
+
+public class CertificatePair : Asn1Encodable
+{
+	private X509CertificateStructure forward;
+
+	private X509CertificateStructure reverse;
+
+	public X509CertificateStructure Forward => forward;
+
+	public X509CertificateStructure Reverse => reverse;
+
+	public static CertificatePair GetInstance(object obj)
+	{
+		if (obj == null || obj is CertificatePair)
+		{
+			return (CertificatePair)obj;
+		}
+		if (obj is Asn1Sequence)
+		{
+			return new CertificatePair((Asn1Sequence)obj);
+		}
+		throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(obj), "obj");
+	}
+
+	private CertificatePair(Asn1Sequence seq)
+	{
+		if (seq.Count != 1 && seq.Count != 2)
+		{
+			throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");
+		}
+		foreach (object item in seq)
+		{
+			Asn1TaggedObject instance = Asn1TaggedObject.GetInstance(item);
+			if (instance.TagNo == 0)
+			{
+				forward = X509CertificateStructure.GetInstance(instance, explicitly: true);
+				continue;
+			}
+			if (instance.TagNo == 1)
+			{
+				reverse = X509CertificateStructure.GetInstance(instance, explicitly: true);
+				continue;
+			}
+			throw new ArgumentException("Bad tag number: " + instance.TagNo);
+		}
+	}
+
+	public CertificatePair(X509CertificateStructure forward, X509CertificateStructure reverse)
+	{
+		this.forward = forward;
+		this.reverse = reverse;
+	}
+
+	public override Asn1Object ToAsn1Object()
+	{
+		Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector();
+		if (forward != null)
+		{
+			asn1EncodableVector.Add(new DerTaggedObject(0, forward));
+		}
+		if (reverse != null)
+		{
+			asn1EncodableVector.Add(new DerTaggedObject(1, reverse));
+		}
+		return new DerSequence(asn1EncodableVector);
+	}
+}