package org.bouncycastle.asn1.cms;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1SetParser;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.ASN1TaggedObjectParser;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERTags;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

Produce an object suitable for an ASN1OutputStream.
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
/** * 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 DEREncodable nextObject; private boolean originatorInfoCalled; public AuthenticatedDataParser( ASN1SequenceParser seq) throws IOException { this.seq = seq; this.version = (DERInteger)seq.readObject(); } public DERInteger 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(DERTags.SEQUENCE, false); nextObject = null; return OriginatorInfo.getInstance(originatorInfo.getDERObject()); } 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 AlgorithmIdentifier getMacAlgorithm() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject != null) { ASN1SequenceParser o = (ASN1SequenceParser)nextObject; nextObject = null; return AlgorithmIdentifier.getInstance(o.getDERObject()); } return null; } public AlgorithmIdentifier getDigestAlgorithm() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject instanceof ASN1TaggedObjectParser) { AlgorithmIdentifier obj = AlgorithmIdentifier.getInstance((ASN1TaggedObject)nextObject.getDERObject(), false); nextObject = null; return obj; } return null; } public ContentInfoParser getEnapsulatedContentInfo() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject != null) { ASN1SequenceParser o = (ASN1SequenceParser)nextObject; nextObject = null; return new ContentInfoParser(o); } return null; } public ASN1SetParser getAuthAttrs() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject instanceof ASN1TaggedObjectParser) { DEREncodable o = nextObject; nextObject = null; return (ASN1SetParser)((ASN1TaggedObjectParser)o).getObjectParser(DERTags.SET, false); } return null; } public ASN1OctetString getMac() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } DEREncodable o = nextObject; nextObject = null; return ASN1OctetString.getInstance(o.getDERObject()); } public ASN1SetParser getUnauthAttrs() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject != null) { DEREncodable o = nextObject; nextObject = null; return (ASN1SetParser)((ASN1TaggedObjectParser)o).getObjectParser(DERTags.SET, false); } return null; } }