init commit

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

@@ -0,0 +1,81 @@
+namespace Org.BouncyCastle.Asn1.Cms;
+
+public class EnvelopedDataParser
+{
+	private Asn1SequenceParser _seq;
+
+	private DerInteger _version;
+
+	private IAsn1Convertible _nextObject;
+
+	private bool _originatorInfoCalled;
+
+	public DerInteger Version => _version;
+
+	public EnvelopedDataParser(Asn1SequenceParser seq)
+	{
+		_seq = seq;
+		_version = (DerInteger)seq.ReadObject();
+	}
+
+	public OriginatorInfo GetOriginatorInfo()
+	{
+		_originatorInfoCalled = true;
+		if (_nextObject == null)
+		{
+			_nextObject = _seq.ReadObject();
+		}
+		if (_nextObject is Asn1TaggedObjectParser && ((Asn1TaggedObjectParser)_nextObject).TagNo == 0)
+		{
+			Asn1SequenceParser asn1SequenceParser = (Asn1SequenceParser)((Asn1TaggedObjectParser)_nextObject).GetObjectParser(16, isExplicit: false);
+			_nextObject = null;
+			return OriginatorInfo.GetInstance(asn1SequenceParser.ToAsn1Object());
+		}
+		return null;
+	}
+
+	public Asn1SetParser GetRecipientInfos()
+	{
+		if (!_originatorInfoCalled)
+		{
+			GetOriginatorInfo();
+		}
+		if (_nextObject == null)
+		{
+			_nextObject = _seq.ReadObject();
+		}
+		Asn1SetParser result = (Asn1SetParser)_nextObject;
+		_nextObject = null;
+		return result;
+	}
+
+	public EncryptedContentInfoParser GetEncryptedContentInfo()
+	{
+		if (_nextObject == null)
+		{
+			_nextObject = _seq.ReadObject();
+		}
+		if (_nextObject != null)
+		{
+			Asn1SequenceParser seq = (Asn1SequenceParser)_nextObject;
+			_nextObject = null;
+			return new EncryptedContentInfoParser(seq);
+		}
+		return null;
+	}
+
+	public Asn1SetParser GetUnprotectedAttrs()
+	{
+		if (_nextObject == null)
+		{
+			_nextObject = _seq.ReadObject();
+		}
+		if (_nextObject != null)
+		{
+			IAsn1Convertible nextObject = _nextObject;
+			_nextObject = null;
+			return (Asn1SetParser)((Asn1TaggedObjectParser)nextObject).GetObjectParser(17, isExplicit: false);
+		}
+		return null;
+	}
+}