diff --git a/Crypto/src/asn1/cmp/PKIMessage.cs b/Crypto/src/asn1/cmp/PKIMessage.cs
new file mode 100644
index 000000000..086a2d938
--- /dev/null
+++ b/Crypto/src/asn1/cmp/PKIMessage.cs
@@ -0,0 +1,140 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.Cmp
+{
+ public class PkiMessage
+ : Asn1Encodable
+ {
+ private readonly PkiHeader header;
+ private readonly PkiBody body;
+ private readonly DerBitString protection;
+ private readonly Asn1Sequence extraCerts;
+
+ private PkiMessage(Asn1Sequence seq)
+ {
+ header = PkiHeader.GetInstance(seq[0]);
+ body = PkiBody.GetInstance(seq[1]);
+
+ for (int pos = 2; pos < seq.Count; ++pos)
+ {
+ Asn1TaggedObject tObj = (Asn1TaggedObject)seq[pos].ToAsn1Object();
+
+ if (tObj.TagNo == 0)
+ {
+ protection = DerBitString.GetInstance(tObj, true);
+ }
+ else
+ {
+ extraCerts = Asn1Sequence.GetInstance(tObj, true);
+ }
+ }
+ }
+
+ public static PkiMessage GetInstance(object obj)
+ {
+ if (obj is PkiMessage)
+ return (PkiMessage)obj;
+
+ if (obj != null)
+ return new PkiMessage(Asn1Sequence.GetInstance(obj));
+
+ return null;
+ }
+
+ /**
+ * Creates a new PkiMessage.
+ *
+ * @param header message header
+ * @param body message body
+ * @param protection message protection (may be null)
+ * @param extraCerts extra certificates (may be null)
+ */
+ public PkiMessage(
+ PkiHeader header,
+ PkiBody body,
+ DerBitString protection,
+ CmpCertificate[] extraCerts)
+ {
+ this.header = header;
+ this.body = body;
+ this.protection = protection;
+ if (extraCerts != null)
+ {
+ this.extraCerts = new DerSequence(extraCerts);
+ }
+ }
+
+ public PkiMessage(
+ PkiHeader header,
+ PkiBody body,
+ DerBitString protection)
+ : this(header, body, protection, null)
+ {
+ }
+
+ public PkiMessage(
+ PkiHeader header,
+ PkiBody body)
+ : this(header, body, null, null)
+ {
+ }
+
+ public virtual PkiHeader Header
+ {
+ get { return header; }
+ }
+
+ public virtual PkiBody Body
+ {
+ get { return body; }
+ }
+
+ public virtual DerBitString Protection
+ {
+ get { return protection; }
+ }
+
+ public virtual CmpCertificate[] GetExtraCerts()
+ {
+ if (extraCerts == null)
+ return null;
+
+ CmpCertificate[] results = new CmpCertificate[extraCerts.Count];
+ for (int i = 0; i < results.Length; ++i)
+ {
+ results[i] = CmpCertificate.GetInstance(extraCerts[i]);
+ }
+ return results;
+ }
+
+ /**
+ * <pre>
+ * PkiMessage ::= SEQUENCE {
+ * header PKIHeader,
+ * body PKIBody,
+ * protection [0] PKIProtection OPTIONAL,
+ * extraCerts [1] SEQUENCE SIZE (1..MAX) OF CMPCertificate
+ * OPTIONAL
+ * }
+ * </pre>
+ * @return a basic ASN.1 object representation.
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector(header, body);
+
+ AddOptional(v, 0, protection);
+ AddOptional(v, 1, extraCerts);
+
+ return new DerSequence(v);
+ }
+
+ private static void AddOptional(Asn1EncodableVector v, int tagNo, Asn1Encodable obj)
+ {
+ if (obj != null)
+ {
+ v.Add(new DerTaggedObject(true, tagNo, obj));
+ }
+ }
+ }
+}
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