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package org.bouncycastle.asn1.cms;
import java.io.IOException;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1SetParser;
import org.bouncycastle.asn1.ASN1TaggedObjectParser;
import org.bouncycastle.asn1.BERTags;
/**
* Parse {@link AuthEnvelopedData} input stream.
*
* <pre>
* AuthEnvelopedData ::= SEQUENCE {
* version CMSVersion,
* originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
* recipientInfos RecipientInfos,
* authEncryptedContentInfo EncryptedContentInfo,
* authAttrs [1] IMPLICIT AuthAttributes OPTIONAL,
* mac MessageAuthenticationCode,
* unauthAttrs [2] IMPLICIT UnauthAttributes OPTIONAL }
* </pre>
*/
public class AuthEnvelopedDataParser
{
private ASN1SequenceParser seq;
private ASN1Integer version;
private ASN1Encodable nextObject;
private boolean originatorInfoCalled;
public AuthEnvelopedDataParser(ASN1SequenceParser seq) throws IOException
{
this.seq = seq;
// TODO
// "It MUST be set to 0."
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 getAuthEncryptedContentInfo()
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 getAuthAttrs()
throws IOException
{
if (nextObject == null)
{
nextObject = seq.readObject();
}
if (nextObject instanceof ASN1TaggedObjectParser)
{
ASN1Encodable o = nextObject;
nextObject = null;
return (ASN1SetParser)((ASN1TaggedObjectParser)o).getObjectParser(BERTags.SET, false);
}
// TODO
// "The authAttrs MUST be present if the content type carried in
// EncryptedContentInfo is not id-data."
return null;
}
public ASN1OctetString getMac()
throws IOException
{
if (nextObject == null)
{
nextObject = seq.readObject();
}
ASN1Encodable o = nextObject;
nextObject = null;
return ASN1OctetString.getInstance(o.toASN1Primitive());
}
public ASN1SetParser getUnauthAttrs()
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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