Initial Commit

iTechSharp/srcbc/asn1/smime/SMIMECapabilities.cs

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+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Pkcs;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Smime
+{
+    /**
+     * Handler class for dealing with S/MIME Capabilities
+     */
+    public class SmimeCapabilities
+        : Asn1Encodable
+    {
+        /**
+         * general preferences
+         */
+        public static readonly DerObjectIdentifier PreferSignedData = PkcsObjectIdentifiers.PreferSignedData;
+        public static readonly DerObjectIdentifier CannotDecryptAny = PkcsObjectIdentifiers.CannotDecryptAny;
+        public static readonly DerObjectIdentifier SmimeCapabilitesVersions = PkcsObjectIdentifiers.SmimeCapabilitiesVersions;
+
+		/**
+         * encryption algorithms preferences
+         */
+        public static readonly DerObjectIdentifier DesCbc = new DerObjectIdentifier("1.3.14.3.2.7");
+        public static readonly DerObjectIdentifier DesEde3Cbc = PkcsObjectIdentifiers.DesEde3Cbc;
+        public static readonly DerObjectIdentifier RC2Cbc = PkcsObjectIdentifiers.RC2Cbc;
+
+		private Asn1Sequence capabilities;
+
+		/**
+         * return an Attr object from the given object.
+         *
+         * @param o the object we want converted.
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static SmimeCapabilities GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is SmimeCapabilities)
+            {
+                return (SmimeCapabilities) obj;
+            }
+
+			if (obj is Asn1Sequence)
+            {
+                return new SmimeCapabilities((Asn1Sequence) obj);
+            }
+
+			if (obj is AttributeX509)
+            {
+                return new SmimeCapabilities(
+                    (Asn1Sequence)(((AttributeX509) obj).AttrValues[0]));
+            }
+
+			throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+        }
+
+		public SmimeCapabilities(
+            Asn1Sequence seq)
+        {
+            capabilities = seq;
+        }
+
+		/**
+         * returns an ArrayList with 0 or more objects of all the capabilities
+         * matching the passed in capability Oid. If the Oid passed is null the
+         * entire set is returned.
+         */
+        public ArrayList GetCapabilities(
+            DerObjectIdentifier capability)
+        {
+            ArrayList list = new ArrayList();
+
+			if (capability == null)
+            {
+				foreach (object o in capabilities)
+				{
+                    SmimeCapability cap = SmimeCapability.GetInstance(o);
+
+					list.Add(cap);
+                }
+            }
+            else
+            {
+				foreach (object o in capabilities)
+				{
+                    SmimeCapability cap = SmimeCapability.GetInstance(o);
+
+					if (capability.Equals(cap.CapabilityID))
+                    {
+                        list.Add(cap);
+                    }
+                }
+            }
+
+			return list;
+        }
+
+		/**
+         * Produce an object suitable for an Asn1OutputStream.
+         * <pre>
+         * SMIMECapabilities ::= Sequence OF SMIMECapability
+         * </pre>
+         */
+        public override Asn1Object ToAsn1Object()
+        {
+            return capabilities;
+        }
+    }
+}