| 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 {@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; |
| } |
| } |