1 files changed, 99 insertions, 0 deletions
diff --git a/crypto/src/asn1/cms/KeyTransRecipientInfo.cs b/crypto/src/asn1/cms/KeyTransRecipientInfo.cs
new file mode 100644
index 000000000..aae18c59d
--- /dev/null
+++ b/crypto/src/asn1/cms/KeyTransRecipientInfo.cs
@@ -0,0 +1,99 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+    public class KeyTransRecipientInfo
+        : Asn1Encodable
+    {
+        private DerInteger          version;
+        private RecipientIdentifier rid;
+        private AlgorithmIdentifier keyEncryptionAlgorithm;
+        private Asn1OctetString     encryptedKey;
+
+		public KeyTransRecipientInfo(
+            RecipientIdentifier rid,
+            AlgorithmIdentifier keyEncryptionAlgorithm,
+            Asn1OctetString     encryptedKey)
+        {
+            if (rid.ToAsn1Object() is Asn1TaggedObject)
+            {
+                this.version = new DerInteger(2);
+            }
+            else
+            {
+                this.version = new DerInteger(0);
+            }
+
+			this.rid = rid;
+            this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
+            this.encryptedKey = encryptedKey;
+        }
+
+		public KeyTransRecipientInfo(
+            Asn1Sequence seq)
+        {
+            this.version = (DerInteger) seq[0];
+            this.rid = RecipientIdentifier.GetInstance(seq[1]);
+            this.keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
+            this.encryptedKey = (Asn1OctetString) seq[3];
+        }
+
+		/**
+         * return a KeyTransRecipientInfo object from the given object.
+         *
+         * @param obj the object we want converted.
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static KeyTransRecipientInfo GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is KeyTransRecipientInfo)
+                return (KeyTransRecipientInfo) obj;
+
+			if(obj is Asn1Sequence)
+                return new KeyTransRecipientInfo((Asn1Sequence) obj);
+
+			throw new ArgumentException(
+				"Illegal object in KeyTransRecipientInfo: " + obj.GetType().Name);
+        }
+
+		public DerInteger Version
+		{
+			get { return version; }
+		}
+
+		public RecipientIdentifier RecipientIdentifier
+		{
+			get { return rid; }
+		}
+
+		public AlgorithmIdentifier KeyEncryptionAlgorithm
+		{
+			get { return keyEncryptionAlgorithm; }
+		}
+
+		public Asn1OctetString EncryptedKey
+		{
+			get { return encryptedKey; }
+		}
+
+		/**
+         * Produce an object suitable for an Asn1OutputStream.
+         * <pre>
+         * KeyTransRecipientInfo ::= Sequence {
+         *     version CMSVersion,  -- always set to 0 or 2
+         *     rid RecipientIdentifier,
+         *     keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
+         *     encryptedKey EncryptedKey
+         * }
+         * </pre>
+         */
+        public override Asn1Object ToAsn1Object()
+        {
+			return new DerSequence(version, rid, keyEncryptionAlgorithm, encryptedKey);
+        }
+    }
+}