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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.cmp;

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.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 *  *    KemCiphertextInfo ::= SEQUENCE {
 *      kem              AlgorithmIdentifier{KEM-ALGORITHM, {...}},
 *      ct               OCTET STRING
 *    }
 * 
 */
public class KemCiphertextInfo
    extends ASN1Object
{
    private final AlgorithmIdentifier kem;
    private final ASN1OctetString ct;

    private KemCiphertextInfo(ASN1Sequence seq)
    {
        if (seq.size() != 2)
        {
            throw new IllegalArgumentException("sequence size should 2");
        }

        kem = AlgorithmIdentifier.getInstance(seq.getObjectAt(0));
        ct = ASN1OctetString.getInstance(seq.getObjectAt(1));
    }


    public KemCiphertextInfo(
        AlgorithmIdentifier kem,
        ASN1OctetString ct)
    {
        this.kem = kem;
        this.ct = ct;
    }

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

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

        return null;
    }

    public AlgorithmIdentifier getKem()
    {
        return kem;
    }

    public ASN1OctetString getCt()
    {
        return ct;
    }

    /**
     *      *    KemCiphertextInfo ::= SEQUENCE {
     *      kem              AlgorithmIdentifier{KEM-ALGORITHM, {...}},
     *      ct               OCTET STRING
     *    }
     * 
     *
     * @return a basic ASN.1 object representation.
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        v.add(kem);
        v.add(ct);

        return new DERSequence(v);
    }
}