package org.bouncycastle.asn1.cms;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.ASN1SetParser;
import org.bouncycastle.asn1.ASN1TaggedObjectParser;
import org.bouncycastle.asn1.BERTags;

Parser for RFC 5652: SignedData object.

SignedData ::= SEQUENCE {
    version CMSVersion,
    digestAlgorithms DigestAlgorithmIdentifiers,
    encapContentInfo EncapsulatedContentInfo,
    certificates [0] IMPLICIT CertificateSet OPTIONAL,
    crls [1] IMPLICIT CertificateRevocationLists OPTIONAL,
    signerInfos SignerInfos
  }
/** * Parser for <a href="http://tools.ietf.org/html/rfc5652#section-5.1">RFC 5652</a>: {@link SignedData} object. * <p> * <pre> * SignedData ::= SEQUENCE { * version CMSVersion, * digestAlgorithms DigestAlgorithmIdentifiers, * encapContentInfo EncapsulatedContentInfo, * certificates [0] IMPLICIT CertificateSet OPTIONAL, * crls [1] IMPLICIT CertificateRevocationLists OPTIONAL, * signerInfos SignerInfos * } * </pre> */
public class SignedDataParser { private ASN1SequenceParser _seq; private ASN1Integer _version; private Object _nextObject; private boolean _certsCalled; private boolean _crlsCalled; public static SignedDataParser getInstance( Object o) throws IOException { if (o instanceof ASN1Sequence) { return new SignedDataParser(((ASN1Sequence)o).parser()); } if (o instanceof ASN1SequenceParser) { return new SignedDataParser((ASN1SequenceParser)o); } throw new IOException("unknown object encountered: " + o.getClass().getName()); } private SignedDataParser( ASN1SequenceParser seq) throws IOException { this._seq = seq; this._version = (ASN1Integer)seq.readObject(); } public ASN1Integer getVersion() { return _version; } public ASN1SetParser getDigestAlgorithms() throws IOException { Object o = _seq.readObject(); if (o instanceof ASN1Set) { return ((ASN1Set)o).parser(); } return (ASN1SetParser)o; } public ContentInfoParser getEncapContentInfo() throws IOException { return new ContentInfoParser((ASN1SequenceParser)_seq.readObject()); } public ASN1SetParser getCertificates() throws IOException { _certsCalled = true; _nextObject = _seq.readObject(); if (_nextObject instanceof ASN1TaggedObjectParser && ((ASN1TaggedObjectParser)_nextObject).getTagNo() == 0) { ASN1SetParser certs = (ASN1SetParser)((ASN1TaggedObjectParser)_nextObject).getObjectParser(BERTags.SET, false); _nextObject = null; return certs; } return null; } public ASN1SetParser getCrls() throws IOException { if (!_certsCalled) { throw new IOException("getCerts() has not been called."); } _crlsCalled = true; if (_nextObject == null) { _nextObject = _seq.readObject(); } if (_nextObject instanceof ASN1TaggedObjectParser && ((ASN1TaggedObjectParser)_nextObject).getTagNo() == 1) { ASN1SetParser crls = (ASN1SetParser)((ASN1TaggedObjectParser)_nextObject).getObjectParser(BERTags.SET, false); _nextObject = null; return crls; } return null; } public ASN1SetParser getSignerInfos() throws IOException { if (!_certsCalled || !_crlsCalled) { throw new IOException("getCerts() and/or getCrls() has not been called."); } if (_nextObject == null) { _nextObject = _seq.readObject(); } return (ASN1SetParser)_nextObject; } }