1 files changed, 130 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/asn1/cms/ContentInfo.java b/core/src/main/java/org/spongycastle/asn1/cms/ContentInfo.java
new file mode 100644
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+++ b/core/src/main/java/org/spongycastle/asn1/cms/ContentInfo.java
@@ -0,0 +1,130 @@
+package org.spongycastle.asn1.cms;
+
+import org.spongycastle.asn1.ASN1Encodable;
+import org.spongycastle.asn1.ASN1EncodableVector;
+import org.spongycastle.asn1.ASN1Object;
+import org.spongycastle.asn1.ASN1ObjectIdentifier;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.asn1.ASN1TaggedObject;
+import org.spongycastle.asn1.BERSequence;
+import org.spongycastle.asn1.BERTaggedObject;
+
+/**
+ * <a href="http://tools.ietf.org/html/rfc5652#section-3">RFC 5652</a> ContentInfo, and 
+ * <a href="http://tools.ietf.org/html/rfc5652#section-5.2">RFC 5652</a> EncapsulatedContentInfo objects.
+ *
+ * <pre>
+ * ContentInfo ::= SEQUENCE {
+ *     contentType ContentType,
+ *     content [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL
+ * }
+ *
+ * EncapsulatedContentInfo ::= SEQUENCE {
+ *     eContentType ContentType,
+ *     eContent [0] EXPLICIT OCTET STRING OPTIONAL
+ * }
+ * </pre>
+ */
+public class ContentInfo
+    extends ASN1Object
+    implements CMSObjectIdentifiers
+{
+    private ASN1ObjectIdentifier contentType;
+    private ASN1Encodable        content;
+
+    /**
+     * Return an ContentInfo object from the given object.
+     * <p>
+     * Accepted inputs:
+     * <ul>
+     * <li> null &rarr; null
+     * <li> {@link ContentInfo} object
+     * <li> {@link org.spongycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with ContentInfo structure inside
+     * </ul>
+     *
+     * @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));
+    }
+
+    /**
+     * @deprecated use getInstance()
+     */
+    public 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);
+    }
+}