1 files changed, 120 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/asn1/x509/TargetInformation.java b/core/src/main/java/org/spongycastle/asn1/x509/TargetInformation.java
new file mode 100644
index 00000000..0b8c49a5
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/asn1/x509/TargetInformation.java
@@ -0,0 +1,120 @@
+package org.spongycastle.asn1.x509;
+
+import java.util.Enumeration;
+
+import org.spongycastle.asn1.ASN1Object;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.asn1.DERSequence;
+
+/**
+ * Target information extension for attributes certificates according to RFC
+ * 3281.
+ * 
+ * <pre>
+ *           SEQUENCE OF Targets
+ * </pre>
+ * 
+ */
+public class TargetInformation
+    extends ASN1Object
+{
+    private ASN1Sequence targets;
+
+    /**
+     * Creates an instance of a TargetInformation from the given object.
+     * <p>
+     * <code>obj</code> can be a TargetInformation or a {@link ASN1Sequence}
+     * 
+     * @param obj The object.
+     * @return A TargetInformation instance.
+     * @throws IllegalArgumentException if the given object cannot be
+     *             interpreted as TargetInformation.
+     */
+    public static TargetInformation getInstance(Object obj)
+    {
+        if (obj instanceof TargetInformation)
+        {
+            return (TargetInformation)obj;
+        }
+        else if (obj != null)
+        {
+            return new TargetInformation(ASN1Sequence.getInstance(obj));
+        }
+
+        return null;
+    }
+
+    /**
+     * Constructor from a ASN1Sequence.
+     * 
+     * @param seq The ASN1Sequence.
+     * @throws IllegalArgumentException if the sequence does not contain
+     *             correctly encoded Targets elements.
+     */
+    private TargetInformation(ASN1Sequence seq)
+    {
+        targets = seq;
+    }
+
+    /**
+     * Returns the targets in this target information extension.
+     * 
+     * @return Returns the targets.
+     */
+    public Targets[] getTargetsObjects()
+    {
+        Targets[] copy = new Targets[targets.size()];
+        int count = 0;
+        for (Enumeration e = targets.getObjects(); e.hasMoreElements();)
+        {
+            copy[count++] = Targets.getInstance(e.nextElement());
+        }
+        return copy;
+    }
+
+    /**
+     * Constructs a target information from a single targets element. 
+     * According to RFC 3281 only one targets element must be produced.
+     * 
+     * @param targets A Targets instance.
+     */
+    public TargetInformation(Targets targets)
+    {
+        this.targets = new DERSequence(targets);
+    }
+
+    /**
+     * According to RFC 3281 only one targets element must be produced. If
+     * multiple targets are given they must be merged in
+     * into one targets element.
+     *
+     * @param targets An array with {@link Targets}.
+     */
+    public TargetInformation(Target[] targets)
+    {
+        this(new Targets(targets));
+    }
+
+    /**
+     * Produce an object suitable for an ASN1OutputStream.
+     * 
+     * Returns:
+     * 
+     * <pre>
+     *          SEQUENCE OF Targets
+     * </pre>
+     * 
+     * <p>
+     * According to RFC 3281 only one targets element must be produced. If
+     * multiple targets are given in the constructor they are merged into one
+     * targets element. If this was produced from a
+     * {@link org.spongycastle.asn1.ASN1Sequence} the encoding is kept.
+     * 
+     * @return a ASN1Primitive
+     */
+    public ASN1Primitive toASN1Primitive()
+    {
+        return targets;
+    }
+}