package org.bouncycastle.asn1.cms; import java.io.IOException; import org.bouncycastle.asn1.ASN1Encodable; import org.bouncycastle.asn1.ASN1Integer; import org.bouncycastle.asn1.ASN1SequenceParser; import org.bouncycastle.asn1.ASN1SetParser; import org.bouncycastle.asn1.ASN1TaggedObjectParser; import org.bouncycastle.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; } }