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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls. This jar contains APIs for JDK 1.4.

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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;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DLSequence;
import org.bouncycastle.asn1.DLTaggedObject;

/**
 * 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 final ASN1ObjectIdentifier contentType;
    private final ASN1Encodable        content;
    private final boolean              isDefiniteLength;

    /**
     * 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.getInstance(seq.getObjectAt(1), BERTags.CONTEXT_SPECIFIC); if (!tagged.isExplicit() || tagged.getTagNo() != 0) { throw new IllegalArgumentException("Bad tag for 'content'"); } content = tagged.getExplicitBaseObject(); } else { content = null; } isDefiniteLength = !(seq instanceof BERSequence); } public ContentInfo( ASN1ObjectIdentifier contentType, ASN1Encodable content) { this.contentType = contentType; this.content = content; if (content != null) { ASN1Primitive prim = content.toASN1Primitive(); this.isDefiniteLength = prim instanceof DEROctetString || prim instanceof DLSequence || prim instanceof DERSequence; } else { // no content, keep it simple. this.isDefiniteLength = true; } } public ASN1ObjectIdentifier getContentType() { return contentType; } public ASN1Encodable getContent() { return content; } /** * Return true if this object encapsulates a definite-length structure. * * @return true if definite-length, false if indefinite. */ public boolean isDefiniteLength() { return isDefiniteLength; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(2); v.add(contentType); if (content != null) { if (isDefiniteLength) { v.add(new DLTaggedObject(0, content)); } else { v.add(new BERTaggedObject(0, content)); } } return isDefiniteLength ? (ASN1Primitive)new DLSequence(v) : (ASN1Primitive)new BERSequence(v); } }