init commit

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

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+using System;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1.Cms;
+
+public class KeyTransRecipientInfo : Asn1Encodable
+{
+	private DerInteger version;
+
+	private RecipientIdentifier rid;
+
+	private AlgorithmIdentifier keyEncryptionAlgorithm;
+
+	private Asn1OctetString encryptedKey;
+
+	public DerInteger Version => version;
+
+	public RecipientIdentifier RecipientIdentifier => rid;
+
+	public AlgorithmIdentifier KeyEncryptionAlgorithm => keyEncryptionAlgorithm;
+
+	public Asn1OctetString EncryptedKey => encryptedKey;
+
+	public KeyTransRecipientInfo(RecipientIdentifier rid, AlgorithmIdentifier keyEncryptionAlgorithm, Asn1OctetString encryptedKey)
+	{
+		if (rid.ToAsn1Object() is Asn1TaggedObject)
+		{
+			version = new DerInteger(2);
+		}
+		else
+		{
+			version = new DerInteger(0);
+		}
+		this.rid = rid;
+		this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
+		this.encryptedKey = encryptedKey;
+	}
+
+	public KeyTransRecipientInfo(Asn1Sequence seq)
+	{
+		version = (DerInteger)seq[0];
+		rid = RecipientIdentifier.GetInstance(seq[1]);
+		keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
+		encryptedKey = (Asn1OctetString)seq[3];
+	}
+
+	public static KeyTransRecipientInfo GetInstance(object obj)
+	{
+		if (obj == null || obj is KeyTransRecipientInfo)
+		{
+			return (KeyTransRecipientInfo)obj;
+		}
+		if (obj is Asn1Sequence)
+		{
+			return new KeyTransRecipientInfo((Asn1Sequence)obj);
+		}
+		throw new ArgumentException("Illegal object in KeyTransRecipientInfo: " + Platform.GetTypeName(obj));
+	}
+
+	public override Asn1Object ToAsn1Object()
+	{
+		return new DerSequence(version, rid, keyEncryptionAlgorithm, encryptedKey);
+	}
+}