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using System;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Cms
{
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* AuthenticatedData ::= SEQUENCE {
* version CMSVersion,
* originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
* recipientInfos RecipientInfos,
* macAlgorithm MessageAuthenticationCodeAlgorithm,
* digestAlgorithm [1] DigestAlgorithmIdentifier OPTIONAL,
* encapContentInfo EncapsulatedContentInfo,
* authAttrs [2] IMPLICIT AuthAttributes OPTIONAL,
* mac MessageAuthenticationCode,
* unauthAttrs [3] IMPLICIT UnauthAttributes OPTIONAL }
*
* AuthAttributes ::= SET SIZE (1..MAX) OF Attribute
*
* UnauthAttributes ::= SET SIZE (1..MAX) OF Attribute
*
* MessageAuthenticationCode ::= OCTET STRING
* </pre>
*/
public class AuthenticatedDataParser
{
private Asn1SequenceParser seq;
private DerInteger version;
private IAsn1Convertible nextObject;
private bool originatorInfoCalled;
public AuthenticatedDataParser(
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 o)
{
if (o.HasContextTag(0))
{
Asn1SequenceParser originatorInfo = (Asn1SequenceParser)o.ParseBaseUniversal(false, Asn1Tags.Sequence);
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 AlgorithmIdentifier GetMacAlgorithm()
{
if (nextObject == null)
{
nextObject = seq.ReadObject();
}
if (nextObject != null)
{
Asn1SequenceParser o = (Asn1SequenceParser)nextObject;
nextObject = null;
return AlgorithmIdentifier.GetInstance(o.ToAsn1Object());
}
return null;
}
public AlgorithmIdentifier GetDigestAlgorithm()
{
if (nextObject == null)
{
nextObject = seq.ReadObject();
}
if (nextObject is Asn1TaggedObjectParser)
{
AlgorithmIdentifier obj = AlgorithmIdentifier.GetInstance(
(Asn1TaggedObject)nextObject.ToAsn1Object(), false);
nextObject = null;
return obj;
}
return null;
}
public ContentInfoParser GetEnapsulatedContentInfo()
{
if (nextObject == null)
{
nextObject = seq.ReadObject();
}
if (nextObject != null)
{
Asn1SequenceParser o = (Asn1SequenceParser)nextObject;
nextObject = null;
return new ContentInfoParser(o);
}
return null;
}
public Asn1SetParser GetAuthAttrs()
{
if (nextObject == null)
{
nextObject = seq.ReadObject();
}
if (nextObject is Asn1TaggedObjectParser o)
{
nextObject = null;
return (Asn1SetParser)Asn1Utilities.ParseContextBaseUniversal(o, 2, false, Asn1Tags.SetOf);
}
return null;
}
public Asn1OctetString GetMac()
{
if (nextObject == null)
{
nextObject = seq.ReadObject();
}
IAsn1Convertible o = nextObject;
nextObject = null;
return Asn1OctetString.GetInstance(o.ToAsn1Object());
}
public Asn1SetParser GetUnauthAttrs()
{
if (nextObject == null)
{
nextObject = seq.ReadObject();
}
if (nextObject != null)
{
Asn1TaggedObject o = (Asn1TaggedObject)nextObject;
nextObject = null;
return (Asn1SetParser)Asn1Utilities.ParseContextBaseUniversal(o, 3, false, Asn1Tags.SetOf);
}
return null;
}
}
}
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