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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.cmc;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Arrays;

/**
 *  *
 * PublishTrustAnchors ::= SEQUENCE {
 *     seqNumber      INTEGER,
 *     hashAlgorithm  AlgorithmIdentifier,
 *     anchorHashes     SEQUENCE OF OCTET STRING
 * }
 * 
 */
public class PublishTrustAnchors
    extends ASN1Object
{
    private final ASN1Integer seqNumber;
    private final AlgorithmIdentifier hashAlgorithm;
    private final ASN1Sequence anchorHashes;

    public PublishTrustAnchors(BigInteger seqNumber, AlgorithmIdentifier hashAlgorithm, byte[][] anchorHashes)
    {
        this.seqNumber = new ASN1Integer(seqNumber);
        this.hashAlgorithm = hashAlgorithm;

        ASN1EncodableVector v = new ASN1EncodableVector(anchorHashes.length);
        for (int i = 0; i != anchorHashes.length; i++)
        {
             v.add(new DEROctetString(Arrays.clone(anchorHashes[i])));
        }
        this.anchorHashes = new DERSequence(v);
    }

    private PublishTrustAnchors(ASN1Sequence seq)
    {
        if (seq.size() != 3)
        {
            throw new IllegalArgumentException("incorrect sequence size");
        }
        this.seqNumber = ASN1Integer.getInstance(seq.getObjectAt(0));
        this.hashAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
        this.anchorHashes = ASN1Sequence.getInstance(seq.getObjectAt(2));
    }

    public static PublishTrustAnchors getInstance(Object o)
    {
        if (o instanceof PublishTrustAnchors)
        {
            return (PublishTrustAnchors)o;
        }

        if (o != null)
        {
            return new PublishTrustAnchors(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    public BigInteger getSeqNumber()
    {
        return seqNumber.getValue();
    }

    public AlgorithmIdentifier getHashAlgorithm()
    {
        return hashAlgorithm;
    }

    public byte[][] getAnchorHashes()
    {
        byte[][] hashes = new byte[anchorHashes.size()][];

        for (int i = 0; i != hashes.length; i++)
        {
            hashes[i] = Arrays.clone(ASN1OctetString.getInstance(anchorHashes.getObjectAt(i)).getOctets());
        }

        return hashes;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(seqNumber);
        v.add(hashAlgorithm);
        v.add(anchorHashes);

        return new DERSequence(v);
    }
}