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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.oer.its.ieee1609dot2;

import java.util.Iterator;

import org.bouncycastle.asn1.ASN1Encodable;
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.oer.its.ItsUtils;
import org.bouncycastle.util.Arrays;

/**
 *  *     AesCcmCiphertext ::= SEQUENCE {
 *         nonce OCTET STRING (SIZE (12))
 *         ccmCiphertext Opaque -- 16 bytes longer than plaintext
 *     }
 * 
 */
public class AesCcmCiphertext
    extends ASN1Object
{
    private final ASN1OctetString nonce;
    private final Opaque ccmCiphertext;

    public AesCcmCiphertext(ASN1OctetString nonce, Opaque opaque)
    {
        this.nonce = nonce;
        this.ccmCiphertext = opaque;
    }

    private AesCcmCiphertext(ASN1Sequence seq)
    {
        if (seq.size() != 2)
        {
            throw new IllegalArgumentException("expected sequence size of 2");
        }
        Iterator it = seq.iterator();
        nonce = ASN1OctetString.getInstance(it.next());
        ccmCiphertext = Opaque.getInstance(it.next());
    }

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

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

    public ASN1OctetString getNonce()
    {
        return nonce;
    }

    public Opaque getCcmCiphertext()
    {
        return ccmCiphertext;
    }

    public ASN1Primitive toASN1Primitive()
    {
        return ItsUtils.toSequence(nonce, ccmCiphertext);
    }

    public static Builder builder()
    {
        return new Builder();
    }

    public static class Builder
    {

        private ASN1OctetString nonce;
        private Opaque opaque;

        public Builder setNonce(ASN1OctetString nonce)
        {
            this.nonce = nonce;
            return this;
        }

        public Builder setNonce(byte[] nonce)
        {
            return setNonce(new DEROctetString(Arrays.clone(nonce)));
        }
        
        public Builder setCcmCiphertext(Opaque opaque)
        {
            this.opaque = opaque;
            return this;
        }

        public Builder setCcmCiphertext(byte[] opaque)
        {
            return setCcmCiphertext(new Opaque(opaque));
        }

        public AesCcmCiphertext createAesCcmCiphertext()
        {
            return new AesCcmCiphertext(nonce, opaque);
        }
    }
}