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using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Cms
{
/**
* <pre>
* SignedData ::= SEQUENCE {
* version CMSVersion,
* digestAlgorithms DigestAlgorithmIdentifiers,
* encapContentInfo EncapsulatedContentInfo,
* certificates [0] IMPLICIT CertificateSet OPTIONAL,
* crls [1] IMPLICIT CertificateRevocationLists OPTIONAL,
* signerInfos SignerInfos
* }
* </pre>
*/
public class SignedDataParser
{
private readonly Asn1SequenceParser m_seq;
private readonly DerInteger m_version;
private object _nextObject;
private bool _certsCalled;
private bool _crlsCalled;
public static SignedDataParser GetInstance(object o)
{
if (o is Asn1SequenceParser parser)
return new SignedDataParser(parser);
if (o is Asn1Sequence seq)
return new SignedDataParser(seq.Parser);
throw new IOException("unknown object encountered: " + Platform.GetTypeName(o));
}
public SignedDataParser(Asn1SequenceParser seq)
{
m_seq = seq;
m_version = (DerInteger)seq.ReadObject();
}
public DerInteger Version => m_version;
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();
if (_nextObject is Asn1TaggedObjectParser tagged && tagged.HasContextTag(0))
{
Asn1SetParser certs = (Asn1SetParser)tagged.ParseBaseUniversal(false, Asn1Tags.SetOf);
_nextObject = null;
return certs;
}
return null;
}
public Asn1SetParser GetCrls()
{
if (!_certsCalled)
throw new IOException("GetCerts() has not been called.");
_crlsCalled = true;
if (_nextObject == null)
{
_nextObject = m_seq.ReadObject();
}
if (_nextObject is Asn1TaggedObjectParser tagged && tagged.HasContextTag(1))
{
Asn1SetParser crls = (Asn1SetParser)tagged.ParseBaseUniversal(false, Asn1Tags.SetOf);
_nextObject = null;
return crls;
}
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;
}
}
}
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