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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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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: {@link SignedData} object.
 * 
 * 
 * SignedData ::= SEQUENCE {
 *     version CMSVersion,
 *     digestAlgorithms DigestAlgorithmIdentifiers,
 *     encapContentInfo EncapsulatedContentInfo,
 *     certificates [0] IMPLICIT CertificateSet OPTIONAL,
 *     crls [1] IMPLICIT CertificateRevocationLists OPTIONAL,
 *     signerInfos SignerInfos
 *   }
 * 
 */
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;
    }
}