using Org.BouncyCastle.Utilities; using System.IO; 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(); Asn1TaggedObjectParser asn1TaggedObjectParser = _nextObject as Asn1TaggedObjectParser; if (asn1TaggedObjectParser != null && asn1TaggedObjectParser.HasContextTag(0)) { Asn1SetParser result = (Asn1SetParser)asn1TaggedObjectParser.ParseBaseUniversal(false, 17); _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(); Asn1TaggedObjectParser asn1TaggedObjectParser = _nextObject as Asn1TaggedObjectParser; if (asn1TaggedObjectParser != null && asn1TaggedObjectParser.HasContextTag(1)) { Asn1SetParser result = (Asn1SetParser)asn1TaggedObjectParser.ParseBaseUniversal(false, 17); _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; } } }