diff --git a/Crypto/src/asn1/cms/RecipientInfo.cs b/Crypto/src/asn1/cms/RecipientInfo.cs
new file mode 100644
index 000000000..daaf5a5e4
--- /dev/null
+++ b/Crypto/src/asn1/cms/RecipientInfo.cs
@@ -0,0 +1,145 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+ public class RecipientInfo
+ : Asn1Encodable, IAsn1Choice
+ {
+ 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();
+ }
+ }
+}
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