init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Asn1/Cms/KeyAgreeRecipientInfo.cs

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+using System;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1.Cms;
+
+public class KeyAgreeRecipientInfo : Asn1Encodable
+{
+	private DerInteger version;
+
+	private OriginatorIdentifierOrKey originator;
+
+	private Asn1OctetString ukm;
+
+	private AlgorithmIdentifier keyEncryptionAlgorithm;
+
+	private Asn1Sequence recipientEncryptedKeys;
+
+	public DerInteger Version => version;
+
+	public OriginatorIdentifierOrKey Originator => originator;
+
+	public Asn1OctetString UserKeyingMaterial => ukm;
+
+	public AlgorithmIdentifier KeyEncryptionAlgorithm => keyEncryptionAlgorithm;
+
+	public Asn1Sequence RecipientEncryptedKeys => recipientEncryptedKeys;
+
+	public KeyAgreeRecipientInfo(OriginatorIdentifierOrKey originator, Asn1OctetString ukm, AlgorithmIdentifier keyEncryptionAlgorithm, Asn1Sequence recipientEncryptedKeys)
+	{
+		version = new DerInteger(3);
+		this.originator = originator;
+		this.ukm = ukm;
+		this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
+		this.recipientEncryptedKeys = recipientEncryptedKeys;
+	}
+
+	public KeyAgreeRecipientInfo(Asn1Sequence seq)
+	{
+		int index = 0;
+		version = (DerInteger)seq[index++];
+		originator = OriginatorIdentifierOrKey.GetInstance((Asn1TaggedObject)seq[index++], explicitly: true);
+		if (seq[index] is Asn1TaggedObject)
+		{
+			ukm = Asn1OctetString.GetInstance((Asn1TaggedObject)seq[index++], isExplicit: true);
+		}
+		keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[index++]);
+		recipientEncryptedKeys = (Asn1Sequence)seq[index++];
+	}
+
+	public static KeyAgreeRecipientInfo GetInstance(Asn1TaggedObject obj, bool explicitly)
+	{
+		return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+	}
+
+	public static KeyAgreeRecipientInfo GetInstance(object obj)
+	{
+		if (obj == null || obj is KeyAgreeRecipientInfo)
+		{
+			return (KeyAgreeRecipientInfo)obj;
+		}
+		if (obj is Asn1Sequence)
+		{
+			return new KeyAgreeRecipientInfo((Asn1Sequence)obj);
+		}
+		throw new ArgumentException("Illegal object in KeyAgreeRecipientInfo: " + Platform.GetTypeName(obj));
+	}
+
+	public override Asn1Object ToAsn1Object()
+	{
+		Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(version, new DerTaggedObject(explicitly: true, 0, originator));
+		if (ukm != null)
+		{
+			asn1EncodableVector.Add(new DerTaggedObject(explicitly: true, 1, ukm));
+		}
+		asn1EncodableVector.Add(keyEncryptionAlgorithm, recipientEncryptedKeys);
+		return new DerSequence(asn1EncodableVector);
+	}
+}