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package org.spongycastle.asn1.cms;
import java.io.IOException;
import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1Integer;
import org.spongycastle.asn1.ASN1SequenceParser;
import org.spongycastle.asn1.ASN1SetParser;
import org.spongycastle.asn1.ASN1TaggedObjectParser;
import org.spongycastle.asn1.BERTags;
/**
* Parser of <a href="http://tools.ietf.org/html/rfc5652#section-6.1">RFC 5652</a> {@link EnvelopedData} object.
* <p>
* <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 ASN1Integer _version;
private ASN1Encodable _nextObject;
private boolean _originatorInfoCalled;
public EnvelopedDataParser(
ASN1SequenceParser seq)
throws IOException
{
this._seq = seq;
this._version = ASN1Integer.getInstance(seq.readObject());
}
public ASN1Integer getVersion()
{
return _version;
}
public OriginatorInfo getOriginatorInfo()
throws IOException
{
_originatorInfoCalled = true;
if (_nextObject == null)
{
_nextObject = _seq.readObject();
}
if (_nextObject instanceof ASN1TaggedObjectParser && ((ASN1TaggedObjectParser)_nextObject).getTagNo() == 0)
{
ASN1SequenceParser originatorInfo = (ASN1SequenceParser) ((ASN1TaggedObjectParser)_nextObject).getObjectParser(BERTags.SEQUENCE, false);
_nextObject = null;
return OriginatorInfo.getInstance(originatorInfo.toASN1Primitive());
}
return null;
}
public ASN1SetParser getRecipientInfos()
throws IOException
{
if (!_originatorInfoCalled)
{
getOriginatorInfo();
}
if (_nextObject == null)
{
_nextObject = _seq.readObject();
}
ASN1SetParser recipientInfos = (ASN1SetParser)_nextObject;
_nextObject = null;
return recipientInfos;
}
public EncryptedContentInfoParser getEncryptedContentInfo()
throws IOException
{
if (_nextObject == null)
{
_nextObject = _seq.readObject();
}
if (_nextObject != null)
{
ASN1SequenceParser o = (ASN1SequenceParser) _nextObject;
_nextObject = null;
return new EncryptedContentInfoParser(o);
}
return null;
}
public ASN1SetParser getUnprotectedAttrs()
throws IOException
{
if (_nextObject == null)
{
_nextObject = _seq.readObject();
}
if (_nextObject != null)
{
ASN1Encodable o = _nextObject;
_nextObject = null;
return (ASN1SetParser)((ASN1TaggedObjectParser)o).getObjectParser(BERTags.SET, false);
}
return null;
}
}
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