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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.asn1.icao;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * The LDSSecurityObject object (V1.8).
 *  * LDSSecurityObject ::= SEQUENCE {
 *   version                LDSSecurityObjectVersion,
 *   hashAlgorithm          DigestAlgorithmIdentifier,
 *   dataGroupHashValues    SEQUENCE SIZE (2..ub-DataGroups) OF DataHashGroup,
 *   ldsVersionInfo         LDSVersionInfo OPTIONAL
 *   -- if present, version MUST be v1 }
 *
 * DigestAlgorithmIdentifier ::= AlgorithmIdentifier,
 *
 * LDSSecurityObjectVersion :: INTEGER {V0(0)}
 * 
 */
public class LDSSecurityObject
    extends ASN1Object
    implements ICAOObjectIdentifiers
{
    public static final int ub_DataGroups = 16;

    private ASN1Integer version = new ASN1Integer(0);
    private AlgorithmIdentifier digestAlgorithmIdentifier;
    private DataGroupHash[] datagroupHash;
    private LDSVersionInfo versionInfo;

    public static LDSSecurityObject getInstance(
        Object obj)
    {
        if (obj instanceof LDSSecurityObject)
        {
            return (LDSSecurityObject)obj;
        }
        else if (obj != null)
        {
            return new LDSSecurityObject(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    private LDSSecurityObject(
        ASN1Sequence seq)
    {
        if (seq == null || seq.size() == 0)
        {
            throw new IllegalArgumentException("null or empty sequence passed.");
        }

        Enumeration e = seq.getObjects();

        // version
        version = ASN1Integer.getInstance(e.nextElement());
        // digestAlgorithmIdentifier
        digestAlgorithmIdentifier = AlgorithmIdentifier.getInstance(e.nextElement());

        ASN1Sequence datagroupHashSeq = ASN1Sequence.getInstance(e.nextElement());

        if (version.hasValue(1))
        {
            versionInfo = LDSVersionInfo.getInstance(e.nextElement());
        }

        checkDatagroupHashSeqSize(datagroupHashSeq.size());

        datagroupHash = new DataGroupHash[datagroupHashSeq.size()];
        for (int i = 0; i < datagroupHashSeq.size(); i++)
        {
            datagroupHash[i] = DataGroupHash.getInstance(datagroupHashSeq.getObjectAt(i));
        }
    }

    public LDSSecurityObject(
        AlgorithmIdentifier digestAlgorithmIdentifier,
        DataGroupHash[] datagroupHash)
    {
        this.version = new ASN1Integer(0);
        this.digestAlgorithmIdentifier = digestAlgorithmIdentifier;
        this.datagroupHash = copy(datagroupHash);

        checkDatagroupHashSeqSize(datagroupHash.length);
    }

    public LDSSecurityObject(
        AlgorithmIdentifier digestAlgorithmIdentifier,
        DataGroupHash[] datagroupHash,
        LDSVersionInfo versionInfo)
    {
        this.version = new ASN1Integer(1);
        this.digestAlgorithmIdentifier = digestAlgorithmIdentifier;
        this.datagroupHash = copy(datagroupHash);
        this.versionInfo = versionInfo;

        checkDatagroupHashSeqSize(datagroupHash.length);
    }

    private void checkDatagroupHashSeqSize(int size)
    {
        if ((size < 2) || (size > ub_DataGroups))
        {
            throw new IllegalArgumentException("wrong size in DataGroupHashValues : not in (2.." + ub_DataGroups + ")");
        }
    }

    public int getVersion()
    {
        return version.intValueExact();
    }

    public AlgorithmIdentifier getDigestAlgorithmIdentifier()
    {
        return digestAlgorithmIdentifier;
    }

    public DataGroupHash[] getDatagroupHash()
    {
        return copy(datagroupHash);
    }

    public LDSVersionInfo getVersionInfo()
    {
        return versionInfo;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector seq = new ASN1EncodableVector(4);

        seq.add(version);
        seq.add(digestAlgorithmIdentifier);
        seq.add(new DERSequence(datagroupHash));

        if (versionInfo != null)
        {
            seq.add(versionInfo);
        }

        return new DERSequence(seq);
    }

    private DataGroupHash[] copy(DataGroupHash[] dgHash)
    {
        DataGroupHash[] rv = new DataGroupHash[dgHash.length];

        System.arraycopy(dgHash, 0, rv, 0, rv.length);

        return rv;
    }
}