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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls. This jar contains APIs for JDK 1.5 and up.
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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.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1SetParser;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.ASN1TaggedObjectParser;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * Parse {@link AuthenticatedData} stream.
 *  * AuthenticatedData ::= SEQUENCE {
 *       version CMSVersion,
 *       originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
 *       recipientInfos RecipientInfos,
 *       macAlgorithm MessageAuthenticationCodeAlgorithm,
 *       digestAlgorithm [1] DigestAlgorithmIdentifier OPTIONAL,
 *       encapContentInfo EncapsulatedContentInfo,
 *       authAttrs [2] IMPLICIT AuthAttributes OPTIONAL,
 *       mac MessageAuthenticationCode,
 *       unauthAttrs [3] IMPLICIT UnauthAttributes OPTIONAL }
 *
 * AuthAttributes ::= SET SIZE (1..MAX) OF Attribute
 *
 * UnauthAttributes ::= SET SIZE (1..MAX) OF Attribute
 *
 * MessageAuthenticationCode ::= OCTET STRING
 * 
 */
public class AuthenticatedDataParser
{
    private ASN1SequenceParser seq;
    private ASN1Integer version;
    private ASN1Encodable nextObject;
    private boolean originatorInfoCalled;

    public AuthenticatedDataParser(
        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 AlgorithmIdentifier getMacAlgorithm()
        throws IOException
    {
        if (nextObject == null)
        {
            nextObject = seq.readObject();
        }

        if (nextObject != null)
        {
            ASN1SequenceParser o = (ASN1SequenceParser)nextObject;
            nextObject = null;
            return AlgorithmIdentifier.getInstance(o.toASN1Primitive());
        }

        return null;
    }

    public AlgorithmIdentifier getDigestAlgorithm()
        throws IOException
    {
        if (nextObject == null)
        {
            nextObject = seq.readObject();
        }

        if (nextObject instanceof ASN1TaggedObjectParser)
        {
            AlgorithmIdentifier obj = AlgorithmIdentifier.getInstance((ASN1TaggedObject)nextObject.toASN1Primitive(), false);
            nextObject = null;
            return obj;
        }

        return null;
    }

    public ContentInfoParser getEncapsulatedContentInfo()
        throws IOException
    {
        if (nextObject == null)
        {
            nextObject = seq.readObject();
        }

        if (nextObject != null)
        {
            ASN1SequenceParser o = (ASN1SequenceParser)nextObject;
            nextObject = null;
            return new ContentInfoParser(o);
        }

        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);
        }

        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;
    }
}