diff --git a/Crypto/src/asn1/cmp/PKIHeader.cs b/Crypto/src/asn1/cmp/PKIHeader.cs
new file mode 100644
index 000000000..e758e9f16
--- /dev/null
+++ b/Crypto/src/asn1/cmp/PKIHeader.cs
@@ -0,0 +1,237 @@
+using System;
+
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Cmp
+{
+ public class PkiHeader
+ : Asn1Encodable
+ {
+ /**
+ * Value for a "null" recipient or sender.
+ */
+ public static readonly GeneralName NULL_NAME = new GeneralName(X509Name.GetInstance(new DerSequence()));
+
+ public static readonly int CMP_1999 = 1;
+ public static readonly int CMP_2000 = 2;
+
+ private readonly DerInteger pvno;
+ private readonly GeneralName sender;
+ private readonly GeneralName recipient;
+ private readonly DerGeneralizedTime messageTime;
+ private readonly AlgorithmIdentifier protectionAlg;
+ private readonly Asn1OctetString senderKID; // KeyIdentifier
+ private readonly Asn1OctetString recipKID; // KeyIdentifier
+ private readonly Asn1OctetString transactionID;
+ private readonly Asn1OctetString senderNonce;
+ private readonly Asn1OctetString recipNonce;
+ private readonly PkiFreeText freeText;
+ private readonly Asn1Sequence generalInfo;
+
+ private PkiHeader(Asn1Sequence seq)
+ {
+ pvno = DerInteger.GetInstance(seq[0]);
+ sender = GeneralName.GetInstance(seq[1]);
+ recipient = GeneralName.GetInstance(seq[2]);
+
+ for (int pos = 3; pos < seq.Count; ++pos)
+ {
+ Asn1TaggedObject tObj = (Asn1TaggedObject)seq[pos];
+
+ switch (tObj.TagNo)
+ {
+ case 0:
+ messageTime = DerGeneralizedTime.GetInstance(tObj, true);
+ break;
+ case 1:
+ protectionAlg = AlgorithmIdentifier.GetInstance(tObj, true);
+ break;
+ case 2:
+ senderKID = Asn1OctetString.GetInstance(tObj, true);
+ break;
+ case 3:
+ recipKID = Asn1OctetString.GetInstance(tObj, true);
+ break;
+ case 4:
+ transactionID = Asn1OctetString.GetInstance(tObj, true);
+ break;
+ case 5:
+ senderNonce = Asn1OctetString.GetInstance(tObj, true);
+ break;
+ case 6:
+ recipNonce = Asn1OctetString.GetInstance(tObj, true);
+ break;
+ case 7:
+ freeText = PkiFreeText.GetInstance(tObj, true);
+ break;
+ case 8:
+ generalInfo = Asn1Sequence.GetInstance(tObj, true);
+ break;
+ default:
+ throw new ArgumentException("unknown tag number: " + tObj.TagNo, "seq");
+ }
+ }
+ }
+
+ public static PkiHeader GetInstance(object obj)
+ {
+ if (obj is PkiHeader)
+ return (PkiHeader)obj;
+
+ if (obj is Asn1Sequence)
+ return new PkiHeader((Asn1Sequence)obj);
+
+ throw new ArgumentException("Invalid object: " + obj.GetType().Name, "obj");
+ }
+
+ public PkiHeader(
+ int pvno,
+ GeneralName sender,
+ GeneralName recipient)
+ : this(new DerInteger(pvno), sender, recipient)
+ {
+ }
+
+ private PkiHeader(
+ DerInteger pvno,
+ GeneralName sender,
+ GeneralName recipient)
+ {
+ this.pvno = pvno;
+ this.sender = sender;
+ this.recipient = recipient;
+ }
+
+ public virtual DerInteger Pvno
+ {
+ get { return pvno; }
+ }
+
+ public virtual GeneralName Sender
+ {
+ get { return sender; }
+ }
+
+ public virtual GeneralName Recipient
+ {
+ get { return recipient; }
+ }
+
+ public virtual DerGeneralizedTime MessageTime
+ {
+ get { return messageTime; }
+ }
+
+ public virtual AlgorithmIdentifier ProtectionAlg
+ {
+ get { return protectionAlg; }
+ }
+
+ public virtual Asn1OctetString SenderKID
+ {
+ get { return senderKID; }
+ }
+
+ public virtual Asn1OctetString RecipKID
+ {
+ get { return recipKID; }
+ }
+
+ public virtual Asn1OctetString TransactionID
+ {
+ get { return transactionID; }
+ }
+
+ public virtual Asn1OctetString SenderNonce
+ {
+ get { return senderNonce; }
+ }
+
+ public virtual Asn1OctetString RecipNonce
+ {
+ get { return recipNonce; }
+ }
+
+ public virtual PkiFreeText FreeText
+ {
+ get { return freeText; }
+ }
+
+ public virtual InfoTypeAndValue[] GetGeneralInfo()
+ {
+ if (generalInfo == null)
+ {
+ return null;
+ }
+ InfoTypeAndValue[] results = new InfoTypeAndValue[generalInfo.Count];
+ for (int i = 0; i < results.Length; i++)
+ {
+ results[i] = InfoTypeAndValue.GetInstance(generalInfo[i]);
+ }
+ return results;
+ }
+
+ /**
+ * <pre>
+ * PkiHeader ::= SEQUENCE {
+ * pvno INTEGER { cmp1999(1), cmp2000(2) },
+ * sender GeneralName,
+ * -- identifies the sender
+ * recipient GeneralName,
+ * -- identifies the intended recipient
+ * messageTime [0] GeneralizedTime OPTIONAL,
+ * -- time of production of this message (used when sender
+ * -- believes that the transport will be "suitable"; i.e.,
+ * -- that the time will still be meaningful upon receipt)
+ * protectionAlg [1] AlgorithmIdentifier OPTIONAL,
+ * -- algorithm used for calculation of protection bits
+ * senderKID [2] KeyIdentifier OPTIONAL,
+ * recipKID [3] KeyIdentifier OPTIONAL,
+ * -- to identify specific keys used for protection
+ * transactionID [4] OCTET STRING OPTIONAL,
+ * -- identifies the transaction; i.e., this will be the same in
+ * -- corresponding request, response, certConf, and PKIConf
+ * -- messages
+ * senderNonce [5] OCTET STRING OPTIONAL,
+ * recipNonce [6] OCTET STRING OPTIONAL,
+ * -- nonces used to provide replay protection, senderNonce
+ * -- is inserted by the creator of this message; recipNonce
+ * -- is a nonce previously inserted in a related message by
+ * -- the intended recipient of this message
+ * freeText [7] PKIFreeText OPTIONAL,
+ * -- this may be used to indicate context-specific instructions
+ * -- (this field is intended for human consumption)
+ * generalInfo [8] SEQUENCE SIZE (1..MAX) OF
+ * InfoTypeAndValue OPTIONAL
+ * -- this may be used to convey context-specific information
+ * -- (this field not primarily intended for human consumption)
+ * }
+ * </pre>
+ * @return a basic ASN.1 object representation.
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector(pvno, sender, recipient);
+
+ AddOptional(v, 0, messageTime);
+ AddOptional(v, 1, protectionAlg);
+ AddOptional(v, 2, senderKID);
+ AddOptional(v, 3, recipKID);
+ AddOptional(v, 4, transactionID);
+ AddOptional(v, 5, senderNonce);
+ AddOptional(v, 6, recipNonce);
+ AddOptional(v, 7, freeText);
+ AddOptional(v, 8, generalInfo);
+
+ 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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