init commit

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

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+using System.IO;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1.Cms;
+
+public class SignedDataParser
+{
+	private Asn1SequenceParser _seq;
+
+	private DerInteger _version;
+
+	private object _nextObject;
+
+	private bool _certsCalled;
+
+	private bool _crlsCalled;
+
+	public DerInteger Version => _version;
+
+	public static SignedDataParser GetInstance(object o)
+	{
+		if (o is Asn1Sequence)
+		{
+			return new SignedDataParser(((Asn1Sequence)o).Parser);
+		}
+		if (o is Asn1SequenceParser)
+		{
+			return new SignedDataParser((Asn1SequenceParser)o);
+		}
+		throw new IOException("unknown object encountered: " + Platform.GetTypeName(o));
+	}
+
+	public SignedDataParser(Asn1SequenceParser seq)
+	{
+		_seq = seq;
+		_version = (DerInteger)seq.ReadObject();
+	}
+
+	public Asn1SetParser GetDigestAlgorithms()
+	{
+		return (Asn1SetParser)_seq.ReadObject();
+	}
+
+	public ContentInfoParser GetEncapContentInfo()
+	{
+		return new ContentInfoParser((Asn1SequenceParser)_seq.ReadObject());
+	}
+
+	public Asn1SetParser GetCertificates()
+	{
+		_certsCalled = true;
+		_nextObject = _seq.ReadObject();
+		if (_nextObject is Asn1TaggedObjectParser && ((Asn1TaggedObjectParser)_nextObject).TagNo == 0)
+		{
+			Asn1SetParser result = (Asn1SetParser)((Asn1TaggedObjectParser)_nextObject).GetObjectParser(17, isExplicit: false);
+			_nextObject = null;
+			return result;
+		}
+		return null;
+	}
+
+	public Asn1SetParser GetCrls()
+	{
+		if (!_certsCalled)
+		{
+			throw new IOException("GetCerts() has not been called.");
+		}
+		_crlsCalled = true;
+		if (_nextObject == null)
+		{
+			_nextObject = _seq.ReadObject();
+		}
+		if (_nextObject is Asn1TaggedObjectParser && ((Asn1TaggedObjectParser)_nextObject).TagNo == 1)
+		{
+			Asn1SetParser result = (Asn1SetParser)((Asn1TaggedObjectParser)_nextObject).GetObjectParser(17, isExplicit: false);
+			_nextObject = null;
+			return result;
+		}
+		return null;
+	}
+
+	public Asn1SetParser GetSignerInfos()
+	{
+		if (!_certsCalled || !_crlsCalled)
+		{
+			throw new IOException("GetCerts() and/or GetCrls() has not been called.");
+		}
+		if (_nextObject == null)
+		{
+			_nextObject = _seq.ReadObject();
+		}
+		return (Asn1SetParser)_nextObject;
+	}
+}