1 files changed, 82 insertions, 0 deletions
diff --git a/Crypto/src/x509/X509ExtensionBase.cs b/Crypto/src/x509/X509ExtensionBase.cs
new file mode 100644
index 000000000..aaf6695c0
--- /dev/null
+++ b/Crypto/src/x509/X509ExtensionBase.cs
@@ -0,0 +1,82 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.X509
+{
+ public abstract class X509ExtensionBase
+ : IX509Extension
+ {
+ protected abstract X509Extensions GetX509Extensions();
+
+ protected virtual ISet GetExtensionOids(
+ bool critical)
+ {
+ X509Extensions extensions = GetX509Extensions();
+ if (extensions != null)
+ {
+ HashSet set = new HashSet();
+ foreach (DerObjectIdentifier oid in extensions.ExtensionOids)
+ {
+ X509Extension ext = extensions.GetExtension(oid);
+ if (ext.IsCritical == critical)
+ {
+ set.Add(oid.Id);
+ }
+ }
+
+ return set;
+ }
+
+ return null;
+ }
+
+ /// <summary>
+ /// Get non critical extensions.
+ /// </summary>
+ /// <returns>A set of non critical extension oids.</returns>
+ public virtual ISet GetNonCriticalExtensionOids()
+ {
+ return GetExtensionOids(false);
+ }
+
+ /// <summary>
+ /// Get any critical extensions.
+ /// </summary>
+ /// <returns>A sorted list of critical entension.</returns>
+ public virtual ISet GetCriticalExtensionOids()
+ {
+ return GetExtensionOids(true);
+ }
+
+ /// <summary>
+ /// Get the value of a given extension.
+ /// </summary>
+ /// <param name="oid">The object ID of the extension. </param>
+ /// <returns>An Asn1OctetString object if that extension is found or null if not.</returns>
+ [Obsolete("Use version taking a DerObjectIdentifier instead")]
+ public Asn1OctetString GetExtensionValue(
+ string oid)
+ {
+ return GetExtensionValue(new DerObjectIdentifier(oid));
+ }
+
+ public virtual Asn1OctetString GetExtensionValue(
+ DerObjectIdentifier oid)
+ {
+ X509Extensions exts = GetX509Extensions();
+ if (exts != null)
+ {
+ X509Extension ext = exts.GetExtension(oid);
+ if (ext != null)
+ {
+ return ext.Value;
+ }
+ }
+
+ return null;
+ }
+ }
+}
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