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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.ess;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERUTF8String;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERUTF8String;

public class ContentHints
    extends ASN1Object
{
    private DERUTF8String contentDescription;
    private ASN1ObjectIdentifier contentType;

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

        return null;
    }

    /**
     * constructor
     */
    private ContentHints(ASN1Sequence seq)
    {
        ASN1Encodable field = seq.getObjectAt(0);
        if (field.toASN1Primitive() instanceof DERUTF8String)
        {
            contentDescription = DERUTF8String.getInstance(field);
            contentType = ASN1ObjectIdentifier.getInstance(seq.getObjectAt(1));
        }
        else
        {
            contentType = ASN1ObjectIdentifier.getInstance(seq.getObjectAt(0));
        }
    }

    public ContentHints(
        ASN1ObjectIdentifier contentType)
    {
        this.contentType = contentType;
        this.contentDescription = null;
    }

    public ContentHints(
        ASN1ObjectIdentifier contentType,
        DERUTF8String contentDescription)
    {
        this.contentType = contentType;
        this.contentDescription = contentDescription;
    }

    public ASN1ObjectIdentifier getContentType()
    {
        return contentType;
    }

    /**
     * @deprecated Use {@link #getContentDescriptionUTF8()} instead.
     */
    public DERUTF8String getContentDescription()
    {
        return null == contentDescription || contentDescription instanceof DERUTF8String
            ?   (DERUTF8String)contentDescription
            :   new DERUTF8String(contentDescription.getString());
    }

    public DERUTF8String getContentDescriptionUTF8()
    {
        return contentDescription;
    }

    /**
     *      * ContentHints ::= SEQUENCE {
     *   contentDescription UTF8String (SIZE (1..MAX)) OPTIONAL,
     *   contentType ContentType }
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        if (contentDescription != null)
        {
            v.add(contentDescription);
        }

        v.add(contentType);

        return new DERSequence(v);
    }
}