SignedDataParser
using Org.BouncyCastle.Utilities;
using System.IO;
namespace Org.BouncyCastle.Asn1.Cms
{
public class SignedDataParser
{
private readonly Asn1SequenceParser m_seq;
private readonly DerInteger m_version;
private object _nextObject;
private bool _certsCalled;
private bool _crlsCalled;
public DerInteger Version => m_version;
public static SignedDataParser GetInstance(object o)
{
Asn1SequenceParser asn1SequenceParser = o as Asn1SequenceParser;
if (asn1SequenceParser != null)
return new SignedDataParser(asn1SequenceParser);
Asn1Sequence asn1Sequence = o as Asn1Sequence;
if (asn1Sequence != null)
return new SignedDataParser(asn1Sequence.Parser);
throw new IOException("unknown object encountered: " + Platform.GetTypeName(o));
}
public SignedDataParser(Asn1SequenceParser seq)
{
m_seq = seq;
m_version = (DerInteger)seq.ReadObject();
}
public Asn1SetParser GetDigestAlgorithms()
{
return (Asn1SetParser)m_seq.ReadObject();
}
public ContentInfoParser GetEncapContentInfo()
{
return new ContentInfoParser((Asn1SequenceParser)m_seq.ReadObject());
}
public Asn1SetParser GetCertificates()
{
_certsCalled = true;
_nextObject = m_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 = m_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 = m_seq.ReadObject();
return (Asn1SetParser)_nextObject;
}
}
}