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using System;
namespace Org.BouncyCastle.Asn1.Cms
{
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* EnvelopedData ::= SEQUENCE {
* version CMSVersion,
* originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
* recipientInfos RecipientInfos,
* encryptedContentInfo EncryptedContentInfo,
* unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL
* }
* </pre>
*/
public class EnvelopedDataParser
{
private Asn1SequenceParser _seq;
private DerInteger _version;
private IAsn1Convertible _nextObject;
private bool _originatorInfoCalled;
public EnvelopedDataParser(
Asn1SequenceParser seq)
{
this._seq = seq;
this._version = (DerInteger)seq.ReadObject();
}
public DerInteger Version
{
get { return _version; }
}
public OriginatorInfo GetOriginatorInfo()
{
_originatorInfoCalled = true;
if (_nextObject == null)
{
_nextObject = _seq.ReadObject();
}
if (_nextObject is Asn1TaggedObjectParser && ((Asn1TaggedObjectParser)_nextObject).TagNo == 0)
{
Asn1SequenceParser originatorInfo = (Asn1SequenceParser)
((Asn1TaggedObjectParser)_nextObject).GetObjectParser(Asn1Tags.Sequence, false);
_nextObject = null;
return OriginatorInfo.GetInstance(originatorInfo.ToAsn1Object());
}
return null;
}
public Asn1SetParser GetRecipientInfos()
{
if (!_originatorInfoCalled)
{
GetOriginatorInfo();
}
if (_nextObject == null)
{
_nextObject = _seq.ReadObject();
}
Asn1SetParser recipientInfos = (Asn1SetParser)_nextObject;
_nextObject = null;
return recipientInfos;
}
public EncryptedContentInfoParser GetEncryptedContentInfo()
{
if (_nextObject == null)
{
_nextObject = _seq.ReadObject();
}
if (_nextObject != null)
{
Asn1SequenceParser o = (Asn1SequenceParser) _nextObject;
_nextObject = null;
return new EncryptedContentInfoParser(o);
}
return null;
}
public Asn1SetParser GetUnprotectedAttrs()
{
if (_nextObject == null)
{
_nextObject = _seq.ReadObject();
}
if (_nextObject != null)
{
IAsn1Convertible o = _nextObject;
_nextObject = null;
return (Asn1SetParser)((Asn1TaggedObjectParser)o).GetObjectParser(Asn1Tags.Set, false);
}
return null;
}
}
}
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