Initial Commit

iTechSharp/srcbc/asn1/cms/KEKRecipientInfo.cs

@@ -0,0 +1,110 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+    public class KekRecipientInfo
+        : Asn1Encodable
+    {
+        private DerInteger			version;
+        private KekIdentifier       kekID;
+        private AlgorithmIdentifier keyEncryptionAlgorithm;
+        private Asn1OctetString     encryptedKey;
+
+		public KekRecipientInfo(
+            KekIdentifier       kekID,
+            AlgorithmIdentifier keyEncryptionAlgorithm,
+            Asn1OctetString     encryptedKey)
+        {
+            this.version = new DerInteger(4);
+            this.kekID = kekID;
+            this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
+            this.encryptedKey = encryptedKey;
+        }
+
+		public KekRecipientInfo(
+            Asn1Sequence seq)
+        {
+            version = (DerInteger) seq[0];
+            kekID = KekIdentifier.GetInstance(seq[1]);
+            keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
+            encryptedKey = (Asn1OctetString) seq[3];
+        }
+
+		/**
+         * return a KekRecipientInfo object from a tagged object.
+         *
+         * @param obj the tagged object holding the object we want.
+         * @param explicitly true if the object is meant to be explicitly
+         *              tagged false otherwise.
+         * @exception ArgumentException if the object held by the
+         *          tagged object cannot be converted.
+         */
+        public static KekRecipientInfo GetInstance(
+            Asn1TaggedObject	obj,
+            bool				explicitly)
+        {
+            return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+        }
+
+        /**
+         * return a KekRecipientInfo object from the given object.
+         *
+         * @param obj the object we want converted.
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static KekRecipientInfo GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is KekRecipientInfo)
+            {
+                return (KekRecipientInfo)obj;
+            }
+
+            if(obj is Asn1Sequence)
+            {
+                return new KekRecipientInfo((Asn1Sequence)obj);
+            }
+
+            throw new ArgumentException("Invalid KekRecipientInfo: " + obj.GetType().Name);
+        }
+
+		public DerInteger Version
+		{
+			get { return version; }
+		}
+
+		public KekIdentifier KekID
+		{
+			get { return kekID; }
+		}
+
+		public AlgorithmIdentifier KeyEncryptionAlgorithm
+		{
+			get { return keyEncryptionAlgorithm; }
+		}
+
+		public Asn1OctetString EncryptedKey
+		{
+			get { return encryptedKey; }
+		}
+
+		/**
+         * Produce an object suitable for an Asn1OutputStream.
+         * <pre>
+         * KekRecipientInfo ::= Sequence {
+         *     version CMSVersion,  -- always set to 4
+         *     kekID KekIdentifier,
+         *     keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
+         *     encryptedKey EncryptedKey
+         * }
+         * </pre>
+         */
+        public override Asn1Object ToAsn1Object()
+        {
+			return new DerSequence(version, kekID, keyEncryptionAlgorithm, encryptedKey);
+        }
+    }
+}