org.bouncycastle.asn1.cms.ContentInfo Maven / Gradle / Ivy

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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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/***************************************************************/
/******    DO NOT EDIT THIS CLASS bc-java SOURCE FILE     ******/
/***************************************************************/
package org.bouncycastle.asn1.cms;

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.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.BERTaggedObject;

/**
 * RFC 5652 ContentInfo, and 
 * RFC 5652 EncapsulatedContentInfo objects.
 *
 *  * ContentInfo ::= SEQUENCE {
 *     contentType ContentType,
 *     content [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL
 * }
 *
 * EncapsulatedContentInfo ::= SEQUENCE {
 *     eContentType ContentType,
 *     eContent [0] EXPLICIT OCTET STRING OPTIONAL
 * }
 * 
 */
public class ContentInfo
    extends ASN1Object
    implements CMSObjectIdentifiers
{
    private ASN1ObjectIdentifier contentType;
    private ASN1Encodable        content;

    /**
     * Return an ContentInfo object from the given object.
     * 
     * Accepted inputs:
     * 

     *  null → null
     * 
 {@link ContentInfo} object
     * 
 {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with ContentInfo structure inside
     * 
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static ContentInfo getInstance(
        Object  obj)
    {
        if (obj instanceof ContentInfo)
        {
            return (ContentInfo)obj;
        }
        else if (obj != null)
        {
            return new ContentInfo(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public static ContentInfo getInstance(
        ASN1TaggedObject obj,
        boolean explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    private ContentInfo(
        ASN1Sequence  seq)
    {
        if (seq.size() < 1 || seq.size() > 2)
        {
            throw new IllegalArgumentException("Bad sequence size: " + seq.size());
        }

        contentType = (ASN1ObjectIdentifier)seq.getObjectAt(0);

        if (seq.size() > 1)
        {
            ASN1TaggedObject tagged = (ASN1TaggedObject)seq.getObjectAt(1);
            if (!tagged.isExplicit() || tagged.getTagNo() != 0)
            {
                throw new IllegalArgumentException("Bad tag for 'content'");
            }

            content = tagged.getObject();
        }
    }

    public ContentInfo(
        ASN1ObjectIdentifier contentType,
        ASN1Encodable        content)
    {
        this.contentType = contentType;
        this.content = content;
    }

    public ASN1ObjectIdentifier getContentType()
    {
        return contentType;
    }

    public ASN1Encodable getContent()
    {
        return content;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector  v = new ASN1EncodableVector();

        v.add(contentType);

        if (content != null)
        {
            v.add(new BERTaggedObject(0, content));
        }

        return new BERSequence(v);
    }
}