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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 org.bouncycastle.asn1.ASN1EncodableVector;
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;

/**
 *  *      id-cmc-popLinkWitnessV2 OBJECT IDENTIFIER ::= { id-cmc 33 }
 *      PopLinkWitnessV2 ::= SEQUENCE {
 *           keyGenAlgorithm   AlgorithmIdentifier,
 *           macAlgorithm      AlgorithmIdentifier,
 *           witness           OCTET STRING
 *      }
 * 
 */
public class PopLinkWitnessV2
    extends ASN1Object
{
    private final AlgorithmIdentifier keyGenAlgorithm;
    private final AlgorithmIdentifier macAlgorithm;
    private final byte[] witness;

    public PopLinkWitnessV2(AlgorithmIdentifier keyGenAlgorithm, AlgorithmIdentifier macAlgorithm, byte[] witness)
    {
        this.keyGenAlgorithm = keyGenAlgorithm;
        this.macAlgorithm = macAlgorithm;
        this.witness = Arrays.clone(witness);
    }

    private PopLinkWitnessV2(ASN1Sequence seq)
    {
        if (seq.size() != 3)
        {
            throw new IllegalArgumentException("incorrect sequence size");
        }
        this.keyGenAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(0));
        this.macAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
        this.witness = Arrays.clone(ASN1OctetString.getInstance(seq.getObjectAt(2)).getOctets());
    }

    public static PopLinkWitnessV2 getInstance(Object o)
    {
        if (o instanceof PopLinkWitnessV2)
        {
            return (PopLinkWitnessV2)o;
        }

        if (o != null)
        {
            return new PopLinkWitnessV2(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    public AlgorithmIdentifier getKeyGenAlgorithm()
    {
        return keyGenAlgorithm;
    }

    public AlgorithmIdentifier getMacAlgorithm()
    {
        return macAlgorithm;
    }

    public byte[] getWitness()
    {
        return Arrays.clone(witness);
    }

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

        v.add(keyGenAlgorithm);
        v.add(macAlgorithm);
        v.add(new DEROctetString(getWitness()));

        return new DERSequence(v);
    }
}