ContentInfo.java revision 5db505e1f6a68c8d5dfdb0fed0b8607dea7bed96 
1package org.bouncycastle.asn1.cms;
2
3import org.bouncycastle.asn1.ASN1Encodable;
4import org.bouncycastle.asn1.ASN1EncodableVector;
5import org.bouncycastle.asn1.ASN1Object;
6import org.bouncycastle.asn1.ASN1ObjectIdentifier;
7import org.bouncycastle.asn1.ASN1Primitive;
8import org.bouncycastle.asn1.ASN1Sequence;
9import org.bouncycastle.asn1.ASN1TaggedObject;
10import org.bouncycastle.asn1.BERSequence;
11import org.bouncycastle.asn1.BERTaggedObject;
12
13/**
14 * <a href="http://tools.ietf.org/html/rfc5652#section-3">RFC 5652</a> ContentInfo, and
15 * <a href="http://tools.ietf.org/html/rfc5652#section-5.2">RFC 5652</a> EncapsulatedContentInfo objects.
16 *
17 * <pre>
18 * ContentInfo ::= SEQUENCE {
19 *     contentType ContentType,
20 *     content [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL
21 * }
22 *
23 * EncapsulatedContentInfo ::= SEQUENCE {
24 *     eContentType ContentType,
25 *     eContent [0] EXPLICIT OCTET STRING OPTIONAL
26 * }
27 * </pre>
28 */
29public class ContentInfo
30    extends ASN1Object
31    // BEGIN android-removed
32    // implements CMSObjectIdentifiers
33    // END android-removed
34{
35    private ASN1ObjectIdentifier contentType;
36    private ASN1Encodable        content;
37
38    /**
39     * Return an ContentInfo object from the given object.
40     * <p>
41     * Accepted inputs:
42     * <ul>
43     * <li> null &rarr; null
44     * <li> {@link ContentInfo} object
45     * <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with ContentInfo structure inside
46     * </ul>
47     *
48     * @param obj the object we want converted.
49     * @exception IllegalArgumentException if the object cannot be converted.
50     */
51    public static ContentInfo getInstance(
52        Object  obj)
53    {
54        if (obj instanceof ContentInfo)
55        {
56            return (ContentInfo)obj;
57        }
58        else if (obj != null)
59        {
60            return new ContentInfo(ASN1Sequence.getInstance(obj));
61        }
62
63        return null;
64    }
65
66    public static ContentInfo getInstance(
67        ASN1TaggedObject obj,
68        boolean explicit)
69    {
70        return getInstance(ASN1Sequence.getInstance(obj, explicit));
71    }
72
73    /**
74     * @deprecated use getInstance()
75     */
76    public ContentInfo(
77        ASN1Sequence  seq)
78    {
79        if (seq.size() < 1 || seq.size() > 2)
80        {
81            throw new IllegalArgumentException("Bad sequence size: " + seq.size());
82        }
83
84        contentType = (ASN1ObjectIdentifier)seq.getObjectAt(0);
85
86        if (seq.size() > 1)
87        {
88            ASN1TaggedObject tagged = (ASN1TaggedObject)seq.getObjectAt(1);
89            if (!tagged.isExplicit() || tagged.getTagNo() != 0)
90            {
91                throw new IllegalArgumentException("Bad tag for 'content'");
92            }
93
94            content = tagged.getObject();
95        }
96    }
97
98    public ContentInfo(
99        ASN1ObjectIdentifier contentType,
100        ASN1Encodable        content)
101    {
102        this.contentType = contentType;
103        this.content = content;
104    }
105
106    public ASN1ObjectIdentifier getContentType()
107    {
108        return contentType;
109    }
110
111    public ASN1Encodable getContent()
112    {
113        return content;
114    }
115
116    /**
117     * Produce an object suitable for an ASN1OutputStream.
118     */
119    public ASN1Primitive toASN1Primitive()
120    {
121        ASN1EncodableVector  v = new ASN1EncodableVector();
122
123        v.add(contentType);
124
125        if (content != null)
126        {
127            v.add(new BERTaggedObject(0, content));
128        }
129
130        return new BERSequence(v);
131    }
132}
133