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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.its;

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;

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

    private AesCcmCiphertext(ASN1Sequence seq)
    {
        if (seq.size() != 2)
        {
            throw new IllegalArgumentException("sequence not length 2");
        }

        nonce = Utils.octetStringFixed(ASN1OctetString.getInstance(seq.getObjectAt(0)).getOctets(), 12);
        opaque = SequenceOfOctetString.getInstance(seq.getObjectAt(1));
    }

    public static AesCcmCiphertext getInstance(Object o)
    {
        if (o instanceof AesCcmCiphertext)
        {
            return (AesCcmCiphertext)o;
        }
        else if (o != null)
        {
            return new AesCcmCiphertext(ASN1Sequence.getInstance(o));
        }

        return null;
    }

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

        v.add(new DEROctetString(nonce));
        v.add(opaque);

        return new DERSequence(v);
    }
}