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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.

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package org.bouncycastle.asn1.x509;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Enumerated;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERSequence;

/**
 * ObjectDigestInfo ASN.1 structure used in v2 attribute certificates.
 * 
 *  
 *  
 *    ObjectDigestInfo ::= SEQUENCE {
 *         digestedObjectType  ENUMERATED {
 *                 publicKey            (0),
 *                 publicKeyCert        (1),
 *                 otherObjectTypes     (2) },
 *                         -- otherObjectTypes MUST NOT
 *                         -- be used in this profile
 *         otherObjectTypeID   OBJECT IDENTIFIER OPTIONAL,
 *         digestAlgorithm     AlgorithmIdentifier,
 *         objectDigest        BIT STRING
 *    }
 *   
 *


 * 
 */
public class ObjectDigestInfo
    extends ASN1Object
{
    /**
     * The public key is hashed.
     */
    public final static int publicKey = 0;

    /**
     * The public key certificate is hashed.
     */
    public final static int publicKeyCert = 1;

    /**
     * An other object is hashed.
     */
    public final static int otherObjectDigest = 2;

    ASN1Enumerated digestedObjectType;

    ASN1ObjectIdentifier otherObjectTypeID;

    AlgorithmIdentifier digestAlgorithm;

    DERBitString objectDigest;

    public static ObjectDigestInfo getInstance(
        Object obj)
    {
        if (obj instanceof ObjectDigestInfo)
        {
            return (ObjectDigestInfo)obj;
        }

        if (obj != null)
        {
            return new ObjectDigestInfo(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public static ObjectDigestInfo getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    /**
     * Constructor from given details.
     *

* If digestedObjectType is not {@link #publicKeyCert} or * {@link #publicKey} otherObjectTypeID must be given, * otherwise it is ignored. * * @param digestedObjectType The digest object type. * @param otherObjectTypeID The object type ID for * otherObjectDigest. * @param digestAlgorithm The algorithm identifier for the hash. * @param objectDigest The hash value. */ public ObjectDigestInfo( int digestedObjectType, ASN1ObjectIdentifier otherObjectTypeID, AlgorithmIdentifier digestAlgorithm, byte[] objectDigest) { this.digestedObjectType = new ASN1Enumerated(digestedObjectType); if (digestedObjectType == otherObjectDigest) { this.otherObjectTypeID = otherObjectTypeID; } this.digestAlgorithm = digestAlgorithm; this.objectDigest = new DERBitString(objectDigest); } private ObjectDigestInfo( ASN1Sequence seq) { if (seq.size() > 4 || seq.size() < 3) { throw new IllegalArgumentException("Bad sequence size: " + seq.size()); } digestedObjectType = ASN1Enumerated.getInstance(seq.getObjectAt(0)); int offset = 0; if (seq.size() == 4) { otherObjectTypeID = ASN1ObjectIdentifier.getInstance(seq.getObjectAt(1)); offset++; } digestAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1 + offset)); objectDigest = DERBitString.getInstance(seq.getObjectAt(2 + offset)); } public ASN1Enumerated getDigestedObjectType() { return digestedObjectType; } public ASN1ObjectIdentifier getOtherObjectTypeID() { return otherObjectTypeID; } public AlgorithmIdentifier getDigestAlgorithm() { return digestAlgorithm; } public DERBitString getObjectDigest() { return objectDigest; } /** * Produce an object suitable for an ASN1OutputStream. * * * * ObjectDigestInfo ::= SEQUENCE { * digestedObjectType ENUMERATED { * publicKey (0), * publicKeyCert (1), * otherObjectTypes (2) }, * -- otherObjectTypes MUST NOT * -- be used in this profile * otherObjectTypeID OBJECT IDENTIFIER OPTIONAL, * digestAlgorithm AlgorithmIdentifier, * objectDigest BIT STRING * } * * */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(4); v.add(digestedObjectType); if (otherObjectTypeID != null) { v.add(otherObjectTypeID); } v.add(digestAlgorithm); v.add(objectDigest); return new DERSequence(v); } }