diff --git a/Crypto/src/asn1/x509/X509Extensions.cs b/Crypto/src/asn1/x509/X509Extensions.cs
new file mode 100644
index 000000000..1896450f5
--- /dev/null
+++ b/Crypto/src/asn1/x509/X509Extensions.cs
@@ -0,0 +1,451 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+ public class X509Extensions
+ : Asn1Encodable
+ {
+ /**
+ * Subject Directory Attributes
+ */
+ public static readonly DerObjectIdentifier SubjectDirectoryAttributes = new DerObjectIdentifier("2.5.29.9");
+
+ /**
+ * Subject Key Identifier
+ */
+ public static readonly DerObjectIdentifier SubjectKeyIdentifier = new DerObjectIdentifier("2.5.29.14");
+
+ /**
+ * Key Usage
+ */
+ public static readonly DerObjectIdentifier KeyUsage = new DerObjectIdentifier("2.5.29.15");
+
+ /**
+ * Private Key Usage Period
+ */
+ public static readonly DerObjectIdentifier PrivateKeyUsagePeriod = new DerObjectIdentifier("2.5.29.16");
+
+ /**
+ * Subject Alternative Name
+ */
+ public static readonly DerObjectIdentifier SubjectAlternativeName = new DerObjectIdentifier("2.5.29.17");
+
+ /**
+ * Issuer Alternative Name
+ */
+ public static readonly DerObjectIdentifier IssuerAlternativeName = new DerObjectIdentifier("2.5.29.18");
+
+ /**
+ * Basic Constraints
+ */
+ public static readonly DerObjectIdentifier BasicConstraints = new DerObjectIdentifier("2.5.29.19");
+
+ /**
+ * CRL Number
+ */
+ public static readonly DerObjectIdentifier CrlNumber = new DerObjectIdentifier("2.5.29.20");
+
+ /**
+ * Reason code
+ */
+ public static readonly DerObjectIdentifier ReasonCode = new DerObjectIdentifier("2.5.29.21");
+
+ /**
+ * Hold Instruction Code
+ */
+ public static readonly DerObjectIdentifier InstructionCode = new DerObjectIdentifier("2.5.29.23");
+
+ /**
+ * Invalidity Date
+ */
+ public static readonly DerObjectIdentifier InvalidityDate = new DerObjectIdentifier("2.5.29.24");
+
+ /**
+ * Delta CRL indicator
+ */
+ public static readonly DerObjectIdentifier DeltaCrlIndicator = new DerObjectIdentifier("2.5.29.27");
+
+ /**
+ * Issuing Distribution Point
+ */
+ public static readonly DerObjectIdentifier IssuingDistributionPoint = new DerObjectIdentifier("2.5.29.28");
+
+ /**
+ * Certificate Issuer
+ */
+ public static readonly DerObjectIdentifier CertificateIssuer = new DerObjectIdentifier("2.5.29.29");
+
+ /**
+ * Name Constraints
+ */
+ public static readonly DerObjectIdentifier NameConstraints = new DerObjectIdentifier("2.5.29.30");
+
+ /**
+ * CRL Distribution Points
+ */
+ public static readonly DerObjectIdentifier CrlDistributionPoints = new DerObjectIdentifier("2.5.29.31");
+
+ /**
+ * Certificate Policies
+ */
+ public static readonly DerObjectIdentifier CertificatePolicies = new DerObjectIdentifier("2.5.29.32");
+
+ /**
+ * Policy Mappings
+ */
+ public static readonly DerObjectIdentifier PolicyMappings = new DerObjectIdentifier("2.5.29.33");
+
+ /**
+ * Authority Key Identifier
+ */
+ public static readonly DerObjectIdentifier AuthorityKeyIdentifier = new DerObjectIdentifier("2.5.29.35");
+
+ /**
+ * Policy Constraints
+ */
+ public static readonly DerObjectIdentifier PolicyConstraints = new DerObjectIdentifier("2.5.29.36");
+
+ /**
+ * Extended Key Usage
+ */
+ public static readonly DerObjectIdentifier ExtendedKeyUsage = new DerObjectIdentifier("2.5.29.37");
+
+ /**
+ * Freshest CRL
+ */
+ public static readonly DerObjectIdentifier FreshestCrl = new DerObjectIdentifier("2.5.29.46");
+
+ /**
+ * Inhibit Any Policy
+ */
+ public static readonly DerObjectIdentifier InhibitAnyPolicy = new DerObjectIdentifier("2.5.29.54");
+
+ /**
+ * Authority Info Access
+ */
+ public static readonly DerObjectIdentifier AuthorityInfoAccess = new DerObjectIdentifier("1.3.6.1.5.5.7.1.1");
+
+ /**
+ * Subject Info Access
+ */
+ public static readonly DerObjectIdentifier SubjectInfoAccess = new DerObjectIdentifier("1.3.6.1.5.5.7.1.11");
+
+ /**
+ * Logo Type
+ */
+ public static readonly DerObjectIdentifier LogoType = new DerObjectIdentifier("1.3.6.1.5.5.7.1.12");
+
+ /**
+ * BiometricInfo
+ */
+ public static readonly DerObjectIdentifier BiometricInfo = new DerObjectIdentifier("1.3.6.1.5.5.7.1.2");
+
+ /**
+ * QCStatements
+ */
+ public static readonly DerObjectIdentifier QCStatements = new DerObjectIdentifier("1.3.6.1.5.5.7.1.3");
+
+ /**
+ * Audit identity extension in attribute certificates.
+ */
+ public static readonly DerObjectIdentifier AuditIdentity = new DerObjectIdentifier("1.3.6.1.5.5.7.1.4");
+
+ /**
+ * NoRevAvail extension in attribute certificates.
+ */
+ public static readonly DerObjectIdentifier NoRevAvail = new DerObjectIdentifier("2.5.29.56");
+
+ /**
+ * TargetInformation extension in attribute certificates.
+ */
+ public static readonly DerObjectIdentifier TargetInformation = new DerObjectIdentifier("2.5.29.55");
+
+ private readonly IDictionary extensions = Platform.CreateHashtable();
+ private readonly IList ordering;
+
+ public static X509Extensions GetInstance(
+ Asn1TaggedObject obj,
+ bool explicitly)
+ {
+ return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+ }
+
+ public static X509Extensions GetInstance(
+ object obj)
+ {
+ if (obj == null || obj is X509Extensions)
+ {
+ return (X509Extensions) obj;
+ }
+
+ if (obj is Asn1Sequence)
+ {
+ return new X509Extensions((Asn1Sequence) obj);
+ }
+
+ if (obj is Asn1TaggedObject)
+ {
+ return GetInstance(((Asn1TaggedObject) obj).GetObject());
+ }
+
+ throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+ }
+
+ /**
+ * Constructor from Asn1Sequence.
+ *
+ * the extensions are a list of constructed sequences, either with (Oid, OctetString) or (Oid, Boolean, OctetString)
+ */
+ private X509Extensions(
+ Asn1Sequence seq)
+ {
+ this.ordering = Platform.CreateArrayList();
+
+ foreach (Asn1Encodable ae in seq)
+ {
+ Asn1Sequence s = Asn1Sequence.GetInstance(ae.ToAsn1Object());
+
+ if (s.Count < 2 || s.Count > 3)
+ throw new ArgumentException("Bad sequence size: " + s.Count);
+
+ DerObjectIdentifier oid = DerObjectIdentifier.GetInstance(s[0].ToAsn1Object());
+
+ bool isCritical = s.Count == 3
+ && DerBoolean.GetInstance(s[1].ToAsn1Object()).IsTrue;
+
+ Asn1OctetString octets = Asn1OctetString.GetInstance(s[s.Count - 1].ToAsn1Object());
+
+ extensions.Add(oid, new X509Extension(isCritical, octets));
+ ordering.Add(oid);
+ }
+ }
+
+ /**
+ * constructor from a table of extensions.
+ * <p>
+ * it's is assumed the table contains Oid/string pairs.</p>
+ */
+ public X509Extensions(
+ IDictionary extensions)
+ : this(null, extensions)
+ {
+ }
+
+ /**
+ * Constructor from a table of extensions with ordering.
+ * <p>
+ * It's is assumed the table contains Oid/string pairs.</p>
+ */
+ public X509Extensions(
+ IList ordering,
+ IDictionary extensions)
+ {
+ if (ordering == null)
+ {
+ this.ordering = Platform.CreateArrayList(extensions.Keys);
+ }
+ else
+ {
+ this.ordering = Platform.CreateArrayList(ordering);
+ }
+
+ foreach (DerObjectIdentifier oid in this.ordering)
+ {
+ this.extensions.Add(oid, (X509Extension)extensions[oid]);
+ }
+ }
+
+ /**
+ * Constructor from two vectors
+ *
+ * @param objectIDs an ArrayList of the object identifiers.
+ * @param values an ArrayList of the extension values.
+ */
+ public X509Extensions(
+ IList oids,
+ IList values)
+ {
+ this.ordering = Platform.CreateArrayList(oids);
+
+ int count = 0;
+ foreach (DerObjectIdentifier oid in this.ordering)
+ {
+ this.extensions.Add(oid, (X509Extension)values[count++]);
+ }
+ }
+
+#if !(SILVERLIGHT || PORTABLE)
+ /**
+ * constructor from a table of extensions.
+ * <p>
+ * it's is assumed the table contains Oid/string pairs.</p>
+ */
+ [Obsolete]
+ public X509Extensions(
+ Hashtable extensions)
+ : this(null, extensions)
+ {
+ }
+
+ /**
+ * Constructor from a table of extensions with ordering.
+ * <p>
+ * It's is assumed the table contains Oid/string pairs.</p>
+ */
+ [Obsolete]
+ public X509Extensions(
+ ArrayList ordering,
+ Hashtable extensions)
+ {
+ if (ordering == null)
+ {
+ this.ordering = Platform.CreateArrayList(extensions.Keys);
+ }
+ else
+ {
+ this.ordering = Platform.CreateArrayList(ordering);
+ }
+
+ foreach (DerObjectIdentifier oid in this.ordering)
+ {
+ this.extensions.Add(oid, (X509Extension) extensions[oid]);
+ }
+ }
+
+ /**
+ * Constructor from two vectors
+ *
+ * @param objectIDs an ArrayList of the object identifiers.
+ * @param values an ArrayList of the extension values.
+ */
+ [Obsolete]
+ public X509Extensions(
+ ArrayList oids,
+ ArrayList values)
+ {
+ this.ordering = Platform.CreateArrayList(oids);
+
+ int count = 0;
+ foreach (DerObjectIdentifier oid in this.ordering)
+ {
+ this.extensions.Add(oid, (X509Extension) values[count++]);
+ }
+ }
+#endif
+
+ [Obsolete("Use ExtensionOids IEnumerable property")]
+ public IEnumerator Oids()
+ {
+ return ExtensionOids.GetEnumerator();
+ }
+
+ /**
+ * return an Enumeration of the extension field's object ids.
+ */
+ public IEnumerable ExtensionOids
+ {
+ get { return new EnumerableProxy(ordering); }
+ }
+
+ /**
+ * return the extension represented by the object identifier
+ * passed in.
+ *
+ * @return the extension if it's present, null otherwise.
+ */
+ public X509Extension GetExtension(
+ DerObjectIdentifier oid)
+ {
+ return (X509Extension) extensions[oid];
+ }
+
+ /**
+ * <pre>
+ * Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
+ *
+ * Extension ::= SEQUENCE {
+ * extnId EXTENSION.&id ({ExtensionSet}),
+ * critical BOOLEAN DEFAULT FALSE,
+ * extnValue OCTET STRING }
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector vec = new Asn1EncodableVector();
+
+ foreach (DerObjectIdentifier oid in ordering)
+ {
+ X509Extension ext = (X509Extension) extensions[oid];
+ Asn1EncodableVector v = new Asn1EncodableVector(oid);
+
+ if (ext.IsCritical)
+ {
+ v.Add(DerBoolean.True);
+ }
+
+ v.Add(ext.Value);
+
+ vec.Add(new DerSequence(v));
+ }
+
+ return new DerSequence(vec);
+ }
+
+ public bool Equivalent(
+ X509Extensions other)
+ {
+ if (extensions.Count != other.extensions.Count)
+ return false;
+
+ foreach (DerObjectIdentifier oid in extensions.Keys)
+ {
+ if (!extensions[oid].Equals(other.extensions[oid]))
+ return false;
+ }
+
+ return true;
+ }
+
+ public DerObjectIdentifier[] GetExtensionOids()
+ {
+ return ToOidArray(ordering);
+ }
+
+ public DerObjectIdentifier[] GetNonCriticalExtensionOids()
+ {
+ return GetExtensionOids(false);
+ }
+
+ public DerObjectIdentifier[] GetCriticalExtensionOids()
+ {
+ return GetExtensionOids(true);
+ }
+
+ private DerObjectIdentifier[] GetExtensionOids(bool isCritical)
+ {
+ IList oids = Platform.CreateArrayList();
+
+ foreach (DerObjectIdentifier oid in this.ordering)
+ {
+ X509Extension ext = (X509Extension)extensions[oid];
+ if (ext.IsCritical == isCritical)
+ {
+ oids.Add(oid);
+ }
+ }
+
+ return ToOidArray(oids);
+ }
+
+ private static DerObjectIdentifier[] ToOidArray(IList oids)
+ {
+ DerObjectIdentifier[] oidArray = new DerObjectIdentifier[oids.Count];
+ oids.CopyTo(oidArray, 0);
+ return oidArray;
+ }
+ }
+}
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