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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction 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.

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package org.bouncycastle.pkcs;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Encodable;
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;
import org.bouncycastle.asn1.pkcs.PBKDF2Params;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;

/**
 * From https://datatracker.ietf.org/doc/html/rfc8018
 *
 *  * PBMAC1-params ::= SEQUENCE {
 *     keyDerivationFunc AlgorithmIdentifier {{PBMAC1-KDFs}},
 *     messageAuthScheme AlgorithmIdentifier {{PBMAC1-MACs}} }
 * 
 */
public class PBMAC1Params
    extends ASN1Object
    implements PKCSObjectIdentifiers
{
    private AlgorithmIdentifier func;
    private AlgorithmIdentifier scheme;

    public static PBMAC1Params getInstance(
        Object  obj)
    {
        if (obj instanceof PBMAC1Params)
        {
            return (PBMAC1Params)obj;
        }
        if (obj != null)
        {
            return new PBMAC1Params(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public PBMAC1Params(AlgorithmIdentifier keyDevFunc, AlgorithmIdentifier encScheme)
    {
        this.func = keyDevFunc;
        this.scheme = encScheme;
    }

    private PBMAC1Params(
        ASN1Sequence  obj)
    {
        Enumeration e = obj.getObjects();
        ASN1Sequence  funcSeq = ASN1Sequence.getInstance(((ASN1Encodable)e.nextElement()).toASN1Primitive());

        if (funcSeq.getObjectAt(0).equals(id_PBKDF2))
        {
            func = new AlgorithmIdentifier(id_PBKDF2, PBKDF2Params.getInstance(funcSeq.getObjectAt(1)));
        }
        else
        {
            func = AlgorithmIdentifier.getInstance(funcSeq);
        }

        scheme = AlgorithmIdentifier.getInstance(e.nextElement());
    }

    public AlgorithmIdentifier getKeyDerivationFunc()
    {
        return func;
    }

    public AlgorithmIdentifier getMessageAuthScheme()
    {
        return scheme;
    }

    public ASN1Primitive toASN1Primitive()
    {
        return new DERSequence(new ASN1Encodable[] {func, scheme});
    }
}