diff --git a/Crypto/src/asn1/x509/TBSCertificateStructure.cs b/Crypto/src/asn1/x509/TBSCertificateStructure.cs
new file mode 100644
index 000000000..fc7c39ba2
--- /dev/null
+++ b/Crypto/src/asn1/x509/TBSCertificateStructure.cs
@@ -0,0 +1,185 @@
+using System;
+
+using Org.BouncyCastle.Asn1.Pkcs;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+ /**
+ * The TbsCertificate object.
+ * <pre>
+ * TbsCertificate ::= Sequence {
+ * version [ 0 ] Version DEFAULT v1(0),
+ * serialNumber CertificateSerialNumber,
+ * signature AlgorithmIdentifier,
+ * issuer Name,
+ * validity Validity,
+ * subject Name,
+ * subjectPublicKeyInfo SubjectPublicKeyInfo,
+ * issuerUniqueID [ 1 ] IMPLICIT UniqueIdentifier OPTIONAL,
+ * subjectUniqueID [ 2 ] IMPLICIT UniqueIdentifier OPTIONAL,
+ * extensions [ 3 ] Extensions OPTIONAL
+ * }
+ * </pre>
+ * <p>
+ * Note: issuerUniqueID and subjectUniqueID are both deprecated by the IETF. This class
+ * will parse them, but you really shouldn't be creating new ones.</p>
+ */
+ public class TbsCertificateStructure
+ : Asn1Encodable
+ {
+ internal Asn1Sequence seq;
+ internal DerInteger version;
+ internal DerInteger serialNumber;
+ internal AlgorithmIdentifier signature;
+ internal X509Name issuer;
+ internal Time startDate, endDate;
+ internal X509Name subject;
+ internal SubjectPublicKeyInfo subjectPublicKeyInfo;
+ internal DerBitString issuerUniqueID;
+ internal DerBitString subjectUniqueID;
+ internal X509Extensions extensions;
+
+ public static TbsCertificateStructure GetInstance(
+ Asn1TaggedObject obj,
+ bool explicitly)
+ {
+ return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+ }
+
+ public static TbsCertificateStructure GetInstance(
+ object obj)
+ {
+ if (obj is TbsCertificateStructure)
+ return (TbsCertificateStructure) obj;
+
+ if (obj != null)
+ return new TbsCertificateStructure(Asn1Sequence.GetInstance(obj));
+
+ return null;
+ }
+
+ internal TbsCertificateStructure(
+ Asn1Sequence seq)
+ {
+ int seqStart = 0;
+
+ this.seq = seq;
+
+ //
+ // some certficates don't include a version number - we assume v1
+ //
+ if (seq[0] is DerTaggedObject)
+ {
+ version = DerInteger.GetInstance((Asn1TaggedObject)seq[0], true);
+ }
+ else
+ {
+ seqStart = -1; // field 0 is missing!
+ version = new DerInteger(0);
+ }
+
+ serialNumber = DerInteger.GetInstance(seq[seqStart + 1]);
+
+ signature = AlgorithmIdentifier.GetInstance(seq[seqStart + 2]);
+ issuer = X509Name.GetInstance(seq[seqStart + 3]);
+
+ //
+ // before and after dates
+ //
+ Asn1Sequence dates = (Asn1Sequence)seq[seqStart + 4];
+
+ startDate = Time.GetInstance(dates[0]);
+ endDate = Time.GetInstance(dates[1]);
+
+ subject = X509Name.GetInstance(seq[seqStart + 5]);
+
+ //
+ // public key info.
+ //
+ subjectPublicKeyInfo = SubjectPublicKeyInfo.GetInstance(seq[seqStart + 6]);
+
+ for (int extras = seq.Count - (seqStart + 6) - 1; extras > 0; extras--)
+ {
+ DerTaggedObject extra = (DerTaggedObject) seq[seqStart + 6 + extras];
+
+ switch (extra.TagNo)
+ {
+ case 1:
+ issuerUniqueID = DerBitString.GetInstance(extra, false);
+ break;
+ case 2:
+ subjectUniqueID = DerBitString.GetInstance(extra, false);
+ break;
+ case 3:
+ extensions = X509Extensions.GetInstance(extra);
+ break;
+ }
+ }
+ }
+
+ public int Version
+ {
+ get { return version.Value.IntValue + 1; }
+ }
+
+ public DerInteger VersionNumber
+ {
+ get { return version; }
+ }
+
+ public DerInteger SerialNumber
+ {
+ get { return serialNumber; }
+ }
+
+ public AlgorithmIdentifier Signature
+ {
+ get { return signature; }
+ }
+
+ public X509Name Issuer
+ {
+ get { return issuer; }
+ }
+
+ public Time StartDate
+ {
+ get { return startDate; }
+ }
+
+ public Time EndDate
+ {
+ get { return endDate; }
+ }
+
+ public X509Name Subject
+ {
+ get { return subject; }
+ }
+
+ public SubjectPublicKeyInfo SubjectPublicKeyInfo
+ {
+ get { return subjectPublicKeyInfo; }
+ }
+
+ public DerBitString IssuerUniqueID
+ {
+ get { return issuerUniqueID; }
+ }
+
+ public DerBitString SubjectUniqueID
+ {
+ get { return subjectUniqueID; }
+ }
+
+ public X509Extensions Extensions
+ {
+ get { return extensions; }
+ }
+
+ public override Asn1Object ToAsn1Object()
+ {
+ return seq;
+ }
+ }
+}
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