1 files changed, 133 insertions, 0 deletions
diff --git a/Crypto/src/asn1/cms/PasswordRecipientInfo.cs b/Crypto/src/asn1/cms/PasswordRecipientInfo.cs
new file mode 100644
index 000000000..800b57951
--- /dev/null
+++ b/Crypto/src/asn1/cms/PasswordRecipientInfo.cs
@@ -0,0 +1,133 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+    public class PasswordRecipientInfo
+        : Asn1Encodable
+    {
+        private readonly DerInteger				version;
+        private readonly AlgorithmIdentifier	keyDerivationAlgorithm;
+        private readonly AlgorithmIdentifier	keyEncryptionAlgorithm;
+        private readonly Asn1OctetString		encryptedKey;
+
+		public PasswordRecipientInfo(
+            AlgorithmIdentifier	keyEncryptionAlgorithm,
+            Asn1OctetString		encryptedKey)
+        {
+            this.version = new DerInteger(0);
+            this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
+            this.encryptedKey = encryptedKey;
+        }
+
+		public PasswordRecipientInfo(
+			AlgorithmIdentifier	keyDerivationAlgorithm,
+			AlgorithmIdentifier	keyEncryptionAlgorithm,
+			Asn1OctetString		encryptedKey)
+		{
+			this.version = new DerInteger(0);
+			this.keyDerivationAlgorithm = keyDerivationAlgorithm;
+			this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
+			this.encryptedKey = encryptedKey;
+		}
+
+		public PasswordRecipientInfo(
+            Asn1Sequence seq)
+        {
+            version = (DerInteger) seq[0];
+
+			if (seq[1] is Asn1TaggedObject)
+            {
+                keyDerivationAlgorithm = AlgorithmIdentifier.GetInstance((Asn1TaggedObject) seq[1], false);
+                keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
+                encryptedKey = (Asn1OctetString) seq[3];
+            }
+            else
+            {
+                keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[1]);
+                encryptedKey = (Asn1OctetString) seq[2];
+            }
+        }
+
+		/**
+         * return a PasswordRecipientInfo 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 PasswordRecipientInfo GetInstance(
+            Asn1TaggedObject	obj,
+            bool				explicitly)
+        {
+            return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+        }
+
+		/**
+         * return a PasswordRecipientInfo object from the given object.
+         *
+         * @param obj the object we want converted.
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static PasswordRecipientInfo GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is PasswordRecipientInfo)
+                return (PasswordRecipientInfo) obj;
+
+			if (obj is Asn1Sequence)
+                return new PasswordRecipientInfo((Asn1Sequence) obj);
+
+			throw new ArgumentException("Invalid PasswordRecipientInfo: " + obj.GetType().Name);
+        }
+
+		public DerInteger Version
+		{
+			get { return version; }
+		}
+
+		public AlgorithmIdentifier KeyDerivationAlgorithm
+		{
+			get { return keyDerivationAlgorithm; }
+		}
+
+		public AlgorithmIdentifier KeyEncryptionAlgorithm
+		{
+			get { return keyEncryptionAlgorithm; }
+		}
+
+		public Asn1OctetString EncryptedKey
+		{
+			get { return encryptedKey; }
+		}
+
+		/**
+         * Produce an object suitable for an Asn1OutputStream.
+         * <pre>
+         * PasswordRecipientInfo ::= Sequence {
+         *   version CMSVersion,   -- Always set to 0
+         *   keyDerivationAlgorithm [0] KeyDerivationAlgorithmIdentifier
+         *                             OPTIONAL,
+         *  keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
+         *  encryptedKey EncryptedKey }
+         * </pre>
+         */
+        public override Asn1Object ToAsn1Object()
+        {
+            Asn1EncodableVector v = new Asn1EncodableVector(version);
+
+			if (keyDerivationAlgorithm != null)
+            {
+                v.Add(new DerTaggedObject(false, 0, keyDerivationAlgorithm));
+            }
+
+			v.Add(keyEncryptionAlgorithm, encryptedKey);
+
+			return new DerSequence(v);
+        }
+    }
+}