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.ASN1ParsingException;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1SetParser;
import org.bouncycastle.asn1.ASN1TaggedObjectParser;
import org.bouncycastle.asn1.BERTags;

Parse AuthEnvelopedData input stream.
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 }
/** * 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; private EncryptedContentInfoParser authEncryptedContentInfoParser; public AuthEnvelopedDataParser(ASN1SequenceParser seq) throws IOException { this.seq = seq; // "It MUST be set to 0." this.version = ASN1Integer.getInstance(seq.readObject()); if (this.version.getValue().intValue() != 0) { throw new ASN1ParsingException("AuthEnvelopedData version number must be 0"); } } 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; authEncryptedContentInfoParser = new EncryptedContentInfoParser(o); return authEncryptedContentInfoParser; } 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); } // "The authAttrs MUST be present if the content type carried in // EncryptedContentInfo is not id-data." if (!authEncryptedContentInfoParser.getContentType().equals(CMSObjectIdentifiers.data)) { throw new ASN1ParsingException("authAttrs must be present with non-data content"); } 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; } }