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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls. This jar contains APIs for JDK 1.8 and up.
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package org.bouncycastle.asn1.cmp;

import org.bouncycastle.asn1.ASN1Encodable;
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.ASN1TaggedObject;
import org.bouncycastle.asn1.ASN1Util;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/*
 *  * KemOtherInfo ::= SEQUENCE {
 *   staticString      PKIFreeText,  -- MUST be "CMP-KEM"
 *   transactionID [0] OCTET STRING     OPTIONAL,
 *   senderNonce   [1] OCTET STRING     OPTIONAL,
 *   recipNonce    [2] OCTET STRING     OPTIONAL,
 *   len               INTEGER (1..MAX),
 *   mac               AlgorithmIdentifier{MAC-ALGORITHM, {...}}
 *   ct                OCTET STRING
 * }
 * 
 */
public class KemOtherInfo
    extends ASN1Object
{
    private static final PKIFreeText DEFAULT_staticString = new PKIFreeText("CMP-KEM");

    private final PKIFreeText staticString;
    private final ASN1OctetString transactionID;
    private final ASN1OctetString senderNonce;
    private final ASN1OctetString recipNonce;
    private final ASN1Integer len;
    private final AlgorithmIdentifier mac;
    private final ASN1OctetString ct;

    public KemOtherInfo(
        ASN1OctetString transactionID,
        ASN1OctetString senderNonce,
        ASN1OctetString recipNonce,
        ASN1Integer len,
        AlgorithmIdentifier mac,
        ASN1OctetString ct)
    {
        this.staticString = DEFAULT_staticString;
        this.transactionID = transactionID;
        this.senderNonce = senderNonce;
        this.recipNonce = recipNonce;
        this.len = len;
        this.mac = mac;
        this.ct = ct;
    }

    public KemOtherInfo(
        ASN1OctetString transactionID,
        ASN1OctetString senderNonce,
        ASN1OctetString recipNonce,
        long len,
        AlgorithmIdentifier mac,
        ASN1OctetString ct)
    {
        this(transactionID, senderNonce, recipNonce, new ASN1Integer(len), mac, ct);
    }

    private KemOtherInfo(ASN1Sequence seq)
    {
        if (seq.size() < 4 || seq.size() > 7)
        {
            throw new IllegalArgumentException("sequence size should be between 4 and 7 inclusive");
        }

        int seqPos = 0;

        this.staticString = PKIFreeText.getInstance(seq.getObjectAt(seqPos));
        if (!DEFAULT_staticString.equals(staticString))
        {
            throw new IllegalArgumentException("staticString field should be " + DEFAULT_staticString);
        }

        ASN1OctetString transactionID = null;
        ASN1OctetString senderNonce = null;
        ASN1OctetString recipNonce = null;

        ASN1TaggedObject tagged = tryGetTagged(seq, ++seqPos);

        if (tagged != null)
        {
            ASN1Primitive _transactionID = ASN1Util.tryGetContextBaseUniversal(tagged, 0, true, BERTags.OCTET_STRING);
            if (_transactionID != null)
            {
                transactionID = (ASN1OctetString)_transactionID;
                tagged = tryGetTagged(seq, ++seqPos);
            }
        }

        if (tagged != null)
        {
            ASN1Primitive _senderNonce = ASN1Util.tryGetContextBaseUniversal(tagged, 1, true, BERTags.OCTET_STRING);
            if (_senderNonce != null)
            {
                senderNonce = (ASN1OctetString)_senderNonce;
                tagged = tryGetTagged(seq, ++seqPos);
            }
        }

        if (tagged != null)
        {
            ASN1Primitive _recipNonce = ASN1Util.tryGetContextBaseUniversal(tagged, 2, true, BERTags.OCTET_STRING);
            if (_recipNonce != null)
            {
                recipNonce = (ASN1OctetString)_recipNonce;
                tagged = tryGetTagged(seq, ++seqPos);
            }
        }

        if (tagged != null)
        {
            throw new IllegalArgumentException("unknown tag: " + ASN1Util.getTagText(tagged));
        }

        this.transactionID = transactionID;
        this.senderNonce = senderNonce;
        this.recipNonce = recipNonce;

        this.len = ASN1Integer.getInstance(seq.getObjectAt(seqPos));
        this.mac = AlgorithmIdentifier.getInstance(seq.getObjectAt(++seqPos));
        this.ct = ASN1OctetString.getInstance(seq.getObjectAt(++seqPos));

        if (++seqPos != seq.size())
        {
            throw new IllegalArgumentException("unexpected data at end of sequence");
        }
    }

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

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

        return null;
    }

    public ASN1OctetString getTransactionID()
    {
        return transactionID;
    }

    public ASN1OctetString getSenderNonce()
    {
        return senderNonce;
    }

    public ASN1OctetString getRecipNonce()
    {
        return recipNonce;
    }

    public ASN1Integer getLen()
    {
        return len;
    }

    public AlgorithmIdentifier getMac()
    {
        return mac;
    }

    public ASN1OctetString getCt()
    {
        return ct;
    }

    /**
     *      * KemOtherInfo ::= SEQUENCE {
     *   staticString      PKIFreeText,   -- MUST be "CMP-KEM"
     *   transactionID [0] OCTET STRING     OPTIONAL,
     *   senderNonce   [1] OCTET STRING     OPTIONAL,
     *   recipNonce    [2] OCTET STRING     OPTIONAL,
     *   len               INTEGER (1..MAX),
     *   mac               AlgorithmIdentifier{MAC-ALGORITHM, {...}}
     *   ct                OCTET STRING
     * }
     * 
     *
     * @return a basic ASN.1 object representation.
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(7);

        v.add(staticString);
        addOptional(v, 0, transactionID);
        addOptional(v, 1, senderNonce);
        addOptional(v, 2, recipNonce);
        v.add(len);
        v.add(mac);
        v.add(ct);

        return new DERSequence(v);
    }

    private static void addOptional(ASN1EncodableVector v, int tagNo, ASN1Encodable obj)
    {
        if (obj != null)
        {
            v.add(new DERTaggedObject(true, tagNo, obj));
        }
    }

    private static ASN1TaggedObject tryGetTagged(ASN1Sequence seq, int seqPos)
    {
        ASN1Encodable element = seq.getObjectAt(seqPos);
        return element instanceof ASN1TaggedObject ? (ASN1TaggedObject)element : null;
    }
}