diff --git a/Crypto/src/asn1/cms/KeyAgreeRecipientInfo.cs b/Crypto/src/asn1/cms/KeyAgreeRecipientInfo.cs
new file mode 100644
index 000000000..aafb008d4
--- /dev/null
+++ b/Crypto/src/asn1/cms/KeyAgreeRecipientInfo.cs
@@ -0,0 +1,141 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+ public class KeyAgreeRecipientInfo
+ : Asn1Encodable
+ {
+ private DerInteger version;
+ private OriginatorIdentifierOrKey originator;
+ private Asn1OctetString ukm;
+ private AlgorithmIdentifier keyEncryptionAlgorithm;
+ private Asn1Sequence recipientEncryptedKeys;
+
+ public KeyAgreeRecipientInfo(
+ OriginatorIdentifierOrKey originator,
+ Asn1OctetString ukm,
+ AlgorithmIdentifier keyEncryptionAlgorithm,
+ Asn1Sequence recipientEncryptedKeys)
+ {
+ this.version = new DerInteger(3);
+ this.originator = originator;
+ this.ukm = ukm;
+ this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
+ this.recipientEncryptedKeys = recipientEncryptedKeys;
+ }
+
+ public KeyAgreeRecipientInfo(
+ Asn1Sequence seq)
+ {
+ int index = 0;
+
+ version = (DerInteger) seq[index++];
+ originator = OriginatorIdentifierOrKey.GetInstance(
+ (Asn1TaggedObject) seq[index++], true);
+
+ if (seq[index] is Asn1TaggedObject)
+ {
+ ukm = Asn1OctetString.GetInstance(
+ (Asn1TaggedObject) seq[index++], true);
+ }
+
+ keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(
+ seq[index++]);
+
+ recipientEncryptedKeys = (Asn1Sequence) seq[index++];
+ }
+
+ /**
+ * return a KeyAgreeRecipientInfo 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 KeyAgreeRecipientInfo GetInstance(
+ Asn1TaggedObject obj,
+ bool explicitly)
+ {
+ return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+ }
+
+ /**
+ * return a KeyAgreeRecipientInfo object from the given object.
+ *
+ * @param obj the object we want converted.
+ * @exception ArgumentException if the object cannot be converted.
+ */
+ public static KeyAgreeRecipientInfo GetInstance(
+ object obj)
+ {
+ if (obj == null || obj is KeyAgreeRecipientInfo)
+ return (KeyAgreeRecipientInfo)obj;
+
+ if (obj is Asn1Sequence)
+ return new KeyAgreeRecipientInfo((Asn1Sequence)obj);
+
+ throw new ArgumentException(
+ "Illegal object in KeyAgreeRecipientInfo: " + obj.GetType().Name);
+
+ }
+
+ public DerInteger Version
+ {
+ get { return version; }
+ }
+
+ public OriginatorIdentifierOrKey Originator
+ {
+ get { return originator; }
+ }
+
+ public Asn1OctetString UserKeyingMaterial
+ {
+ get { return ukm; }
+ }
+
+ public AlgorithmIdentifier KeyEncryptionAlgorithm
+ {
+ get { return keyEncryptionAlgorithm; }
+ }
+
+ public Asn1Sequence RecipientEncryptedKeys
+ {
+ get { return recipientEncryptedKeys; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ * <pre>
+ * KeyAgreeRecipientInfo ::= Sequence {
+ * version CMSVersion, -- always set to 3
+ * originator [0] EXPLICIT OriginatorIdentifierOrKey,
+ * ukm [1] EXPLICIT UserKeyingMaterial OPTIONAL,
+ * keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
+ * recipientEncryptedKeys RecipientEncryptedKeys
+ * }
+ *
+ * UserKeyingMaterial ::= OCTET STRING
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector(
+ version, new DerTaggedObject(true, 0, originator));
+
+ if (ukm != null)
+ {
+ v.Add(new DerTaggedObject(true, 1, ukm));
+ }
+
+ v.Add(keyEncryptionAlgorithm, recipientEncryptedKeys);
+
+ return new DerSequence(v);
+ }
+ }
+}
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