Initial Commit

iTechSharp/srcbc/asn1/cms/RecipientInfo.cs

@@ -0,0 +1,151 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+    public class RecipientInfo
+        : Asn1Encodable
+    {
+        internal Asn1Encodable info;
+
+		public RecipientInfo(
+            KeyTransRecipientInfo info)
+        {
+            this.info = info;
+        }
+
+		public RecipientInfo(
+            KeyAgreeRecipientInfo info)
+        {
+            this.info = new DerTaggedObject(false, 1, info);
+        }
+
+		public RecipientInfo(
+            KekRecipientInfo info)
+        {
+            this.info = new DerTaggedObject(false, 2, info);
+        }
+
+		public RecipientInfo(
+            PasswordRecipientInfo info)
+        {
+            this.info = new DerTaggedObject(false, 3, info);
+        }
+
+		public RecipientInfo(
+            OtherRecipientInfo info)
+        {
+            this.info = new DerTaggedObject(false, 4, info);
+        }
+
+		public RecipientInfo(
+            Asn1Object   info)
+        {
+            this.info = info;
+        }
+
+		public static RecipientInfo GetInstance(
+            object o)
+        {
+            if (o == null || o is RecipientInfo)
+            {
+                return (RecipientInfo) o;
+            }
+
+			if (o is Asn1Sequence)
+            {
+                return new RecipientInfo((Asn1Sequence) o);
+            }
+
+			if (o is Asn1TaggedObject)
+            {
+                return new RecipientInfo((Asn1TaggedObject) o);
+            }
+
+			throw new ArgumentException("unknown object in factory: " + o.GetType().Name);
+        }
+
+		public DerInteger Version
+        {
+			get
+			{
+				if (info is Asn1TaggedObject)
+				{
+					Asn1TaggedObject o = (Asn1TaggedObject) info;
+
+					switch (o.TagNo)
+					{
+						case 1:
+							return KeyAgreeRecipientInfo.GetInstance(o, false).Version;
+						case 2:
+							return GetKekInfo(o).Version;
+						case 3:
+							return PasswordRecipientInfo.GetInstance(o, false).Version;
+						case 4:
+							return new DerInteger(0);    // no syntax version for OtherRecipientInfo
+						default:
+							throw new InvalidOperationException("unknown tag");
+					}
+				}
+
+				return KeyTransRecipientInfo.GetInstance(info).Version;
+			}
+        }
+
+		public bool IsTagged
+		{
+			get { return info is Asn1TaggedObject; }
+		}
+
+		public Asn1Encodable Info
+        {
+			get
+			{
+				if (info is Asn1TaggedObject)
+				{
+					Asn1TaggedObject o = (Asn1TaggedObject) info;
+
+					switch (o.TagNo)
+					{
+						case 1:
+							return KeyAgreeRecipientInfo.GetInstance(o, false);
+						case 2:
+							return GetKekInfo(o);
+						case 3:
+							return PasswordRecipientInfo.GetInstance(o, false);
+						case 4:
+							return OtherRecipientInfo.GetInstance(o, false);
+						default:
+							throw new InvalidOperationException("unknown tag");
+					}
+				}
+
+				return KeyTransRecipientInfo.GetInstance(info);
+			}
+        }
+
+		private KekRecipientInfo GetKekInfo(
+			Asn1TaggedObject o)
+		{
+			// For compatibility with erroneous version, we don't always pass 'false' here
+			return KekRecipientInfo.GetInstance(o, o.IsExplicit());
+		}
+
+		/**
+         * Produce an object suitable for an Asn1OutputStream.
+         * <pre>
+         * RecipientInfo ::= CHOICE {
+         *     ktri KeyTransRecipientInfo,
+         *     kari [1] KeyAgreeRecipientInfo,
+         *     kekri [2] KekRecipientInfo,
+         *     pwri [3] PasswordRecipientInfo,
+         *     ori [4] OtherRecipientInfo }
+         * </pre>
+         */
+        public override Asn1Object ToAsn1Object()
+        {
+            return info.ToAsn1Object();
+        }
+    }
+}