1 files changed, 139 insertions, 0 deletions
diff --git a/Crypto/src/asn1/x509/Target.cs b/Crypto/src/asn1/x509/Target.cs
new file mode 100644
index 000000000..309b28c95
--- /dev/null
+++ b/Crypto/src/asn1/x509/Target.cs
@@ -0,0 +1,139 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+ /**
+ * Target structure used in target information extension for attribute
+ * certificates from RFC 3281.
+ *
+ * <pre>
+ * Target ::= CHOICE {
+ * targetName [0] GeneralName,
+ * targetGroup [1] GeneralName,
+ * targetCert [2] TargetCert
+ * }
+ * </pre>
+ *
+ * <p>
+ * The targetCert field is currently not supported and must not be used
+ * according to RFC 3281.</p>
+ */
+ public class Target
+ : Asn1Encodable, IAsn1Choice
+ {
+ public enum Choice
+ {
+ Name = 0,
+ Group = 1
+ };
+
+ private readonly GeneralName targetName;
+ private readonly GeneralName targetGroup;
+
+ /**
+ * Creates an instance of a Target from the given object.
+ * <p>
+ * <code>obj</code> can be a Target or a {@link Asn1TaggedObject}</p>
+ *
+ * @param obj The object.
+ * @return A Target instance.
+ * @throws ArgumentException if the given object cannot be
+ * interpreted as Target.
+ */
+ public static Target GetInstance(
+ object obj)
+ {
+ if (obj is Target)
+ {
+ return (Target) obj;
+ }
+
+ if (obj is Asn1TaggedObject)
+ {
+ return new Target((Asn1TaggedObject) obj);
+ }
+
+ throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+ }
+
+ /**
+ * Constructor from Asn1TaggedObject.
+ *
+ * @param tagObj The tagged object.
+ * @throws ArgumentException if the encoding is wrong.
+ */
+ private Target(
+ Asn1TaggedObject tagObj)
+ {
+ switch ((Choice) tagObj.TagNo)
+ {
+ case Choice.Name: // GeneralName is already a choice so explicit
+ targetName = GeneralName.GetInstance(tagObj, true);
+ break;
+ case Choice.Group:
+ targetGroup = GeneralName.GetInstance(tagObj, true);
+ break;
+ default:
+ throw new ArgumentException("unknown tag: " + tagObj.TagNo);
+ }
+ }
+
+ /**
+ * Constructor from given details.
+ * <p>
+ * Exactly one of the parameters must be not <code>null</code>.</p>
+ *
+ * @param type the choice type to apply to the name.
+ * @param name the general name.
+ * @throws ArgumentException if type is invalid.
+ */
+ public Target(
+ Choice type,
+ GeneralName name)
+ : this(new DerTaggedObject((int) type, name))
+ {
+ }
+
+ /**
+ * @return Returns the targetGroup.
+ */
+ public virtual GeneralName TargetGroup
+ {
+ get { return targetGroup; }
+ }
+
+ /**
+ * @return Returns the targetName.
+ */
+ public virtual GeneralName TargetName
+ {
+ get { return targetName; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ *
+ * Returns:
+ *
+ * <pre>
+ * Target ::= CHOICE {
+ * targetName [0] GeneralName,
+ * targetGroup [1] GeneralName,
+ * targetCert [2] TargetCert
+ * }
+ * </pre>
+ *
+ * @return an Asn1Object
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ // GeneralName is a choice already so most be explicitly tagged
+ if (targetName != null)
+ {
+ return new DerTaggedObject(true, 0, targetName);
+ }
+
+ return new DerTaggedObject(true, 1, targetGroup);
+ }
+ }
+}
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