001package org.apache.commons.ssl.org.bouncycastle.asn1.cms;
002
003import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Encodable;
004import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1EncodableVector;
005import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Object;
006import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1ObjectIdentifier;
007import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Primitive;
008import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Sequence;
009import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1TaggedObject;
010import org.apache.commons.ssl.org.bouncycastle.asn1.BERSequence;
011import org.apache.commons.ssl.org.bouncycastle.asn1.BERTaggedObject;
012
013/**
014 * <a href="http://tools.ietf.org/html/rfc5652#section-3">RFC 5652</a> ContentInfo, and 
015 * <a href="http://tools.ietf.org/html/rfc5652#section-5.2">RFC 5652</a> EncapsulatedContentInfo objects.
016 *
017 * <pre>
018 * ContentInfo ::= SEQUENCE {
019 *     contentType ContentType,
020 *     content [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL
021 * }
022 *
023 * EncapsulatedContentInfo ::= SEQUENCE {
024 *     eContentType ContentType,
025 *     eContent [0] EXPLICIT OCTET STRING OPTIONAL
026 * }
027 * </pre>
028 */
029public class ContentInfo
030    extends ASN1Object
031    implements CMSObjectIdentifiers
032{
033    private ASN1ObjectIdentifier contentType;
034    private ASN1Encodable        content;
035
036    /**
037     * Return an ContentInfo object from the given object.
038     * <p>
039     * Accepted inputs:
040     * <ul>
041     * <li> null &rarr; null
042     * <li> {@link ContentInfo} object
043     * <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with ContentInfo structure inside
044     * </ul>
045     *
046     * @param obj the object we want converted.
047     * @exception IllegalArgumentException if the object cannot be converted.
048     */
049    public static ContentInfo getInstance(
050        Object  obj)
051    {
052        if (obj instanceof ContentInfo)
053        {
054            return (ContentInfo)obj;
055        }
056        else if (obj != null)
057        {
058            return new ContentInfo(ASN1Sequence.getInstance(obj));
059        }
060
061        return null;
062    }
063
064    public static ContentInfo getInstance(
065        ASN1TaggedObject obj,
066        boolean explicit)
067    {
068        return getInstance(ASN1Sequence.getInstance(obj, explicit));
069    }
070
071    /**
072     * @deprecated use getInstance()
073     */
074    public ContentInfo(
075        ASN1Sequence  seq)
076    {
077        if (seq.size() < 1 || seq.size() > 2)
078        {
079            throw new IllegalArgumentException("Bad sequence size: " + seq.size());
080        }
081
082        contentType = (ASN1ObjectIdentifier)seq.getObjectAt(0);
083
084        if (seq.size() > 1)
085        {
086            ASN1TaggedObject tagged = (ASN1TaggedObject)seq.getObjectAt(1);
087            if (!tagged.isExplicit() || tagged.getTagNo() != 0)
088            {
089                throw new IllegalArgumentException("Bad tag for 'content'");
090            }
091
092            content = tagged.getObject();
093        }
094    }
095
096    public ContentInfo(
097        ASN1ObjectIdentifier contentType,
098        ASN1Encodable        content)
099    {
100        this.contentType = contentType;
101        this.content = content;
102    }
103
104    public ASN1ObjectIdentifier getContentType()
105    {
106        return contentType;
107    }
108
109    public ASN1Encodable getContent()
110    {
111        return content;
112    }
113
114    /**
115     * Produce an object suitable for an ASN1OutputStream.
116     */
117    public ASN1Primitive toASN1Primitive()
118    {
119        ASN1EncodableVector  v = new ASN1EncodableVector();
120
121        v.add(contentType);
122
123        if (content != null)
124        {
125            v.add(new BERTaggedObject(0, content));
126        }
127
128        return new BERSequence(v);
129    }
130}