diff --git a/Crypto/src/asn1/x509/AttributeCertificateInfo.cs b/Crypto/src/asn1/x509/AttributeCertificateInfo.cs
new file mode 100644
index 000000000..dcef3d472
--- /dev/null
+++ b/Crypto/src/asn1/x509/AttributeCertificateInfo.cs
@@ -0,0 +1,156 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+ public class AttributeCertificateInfo
+ : Asn1Encodable
+ {
+ internal readonly DerInteger version;
+ internal readonly Holder holder;
+ internal readonly AttCertIssuer issuer;
+ internal readonly AlgorithmIdentifier signature;
+ internal readonly DerInteger serialNumber;
+ internal readonly AttCertValidityPeriod attrCertValidityPeriod;
+ internal readonly Asn1Sequence attributes;
+ internal readonly DerBitString issuerUniqueID;
+ internal readonly X509Extensions extensions;
+
+ public static AttributeCertificateInfo GetInstance(
+ Asn1TaggedObject obj,
+ bool isExplicit)
+ {
+ return GetInstance(Asn1Sequence.GetInstance(obj, isExplicit));
+ }
+
+ public static AttributeCertificateInfo GetInstance(
+ object obj)
+ {
+ if (obj is AttributeCertificateInfo)
+ {
+ return (AttributeCertificateInfo) obj;
+ }
+
+ if (obj is Asn1Sequence)
+ {
+ return new AttributeCertificateInfo((Asn1Sequence) obj);
+ }
+
+ throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+ }
+
+ private AttributeCertificateInfo(
+ Asn1Sequence seq)
+ {
+ if (seq.Count < 7 || seq.Count > 9)
+ {
+ throw new ArgumentException("Bad sequence size: " + seq.Count);
+ }
+
+ this.version = DerInteger.GetInstance(seq[0]);
+ this.holder = Holder.GetInstance(seq[1]);
+ this.issuer = AttCertIssuer.GetInstance(seq[2]);
+ this.signature = AlgorithmIdentifier.GetInstance(seq[3]);
+ this.serialNumber = DerInteger.GetInstance(seq[4]);
+ this.attrCertValidityPeriod = AttCertValidityPeriod.GetInstance(seq[5]);
+ this.attributes = Asn1Sequence.GetInstance(seq[6]);
+
+ for (int i = 7; i < seq.Count; i++)
+ {
+ Asn1Encodable obj = (Asn1Encodable) seq[i];
+
+ if (obj is DerBitString)
+ {
+ this.issuerUniqueID = DerBitString.GetInstance(seq[i]);
+ }
+ else if (obj is Asn1Sequence || obj is X509Extensions)
+ {
+ this.extensions = X509Extensions.GetInstance(seq[i]);
+ }
+ }
+ }
+
+ public DerInteger Version
+ {
+ get { return version; }
+ }
+
+ public Holder Holder
+ {
+ get { return holder; }
+ }
+
+ public AttCertIssuer Issuer
+ {
+ get { return issuer; }
+ }
+
+ public AlgorithmIdentifier Signature
+ {
+ get { return signature; }
+ }
+
+ public DerInteger SerialNumber
+ {
+ get { return serialNumber; }
+ }
+
+ public AttCertValidityPeriod AttrCertValidityPeriod
+ {
+ get { return attrCertValidityPeriod; }
+ }
+
+ public Asn1Sequence Attributes
+ {
+ get { return attributes; }
+ }
+
+ public DerBitString IssuerUniqueID
+ {
+ get { return issuerUniqueID; }
+ }
+
+ public X509Extensions Extensions
+ {
+ get { return extensions; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ * <pre>
+ * AttributeCertificateInfo ::= Sequence {
+ * version AttCertVersion -- version is v2,
+ * holder Holder,
+ * issuer AttCertIssuer,
+ * signature AlgorithmIdentifier,
+ * serialNumber CertificateSerialNumber,
+ * attrCertValidityPeriod AttCertValidityPeriod,
+ * attributes Sequence OF Attr,
+ * issuerUniqueID UniqueIdentifier OPTIONAL,
+ * extensions Extensions OPTIONAL
+ * }
+ *
+ * AttCertVersion ::= Integer { v2(1) }
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector(
+ version, holder, issuer, signature, serialNumber,
+ attrCertValidityPeriod, attributes);
+
+ if (issuerUniqueID != null)
+ {
+ v.Add(issuerUniqueID);
+ }
+
+ if (extensions != null)
+ {
+ v.Add(extensions);
+ }
+
+ return new DerSequence(v);
+ }
+ }
+}
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