Class for parsing and evaluating RFC 5280 NameConstraints.

net/der/tag.cc

Index: net/der/tag.cc
diff --git a/net/der/tag.cc b/net/der/tag.cc
index a8240243943b2ab9339ae8021612efcee60990f2..99acf8cdfd856a4f4dfd84180c97d8a0791e42c6 100644
--- a/net/der/tag.cc
+++ b/net/der/tag.cc
@@ -20,10 +20,18 @@ Tag ContextSpecificPrimitive(uint8_t base) {
   return (base & kTagNumberMask) | kTagPrimitive | kTagContextSpecific;
 }
 
+bool IsContextSpecific(Tag tag) {
+  return (tag & kTagClassMask) == kTagContextSpecific;
+}
+
 bool IsConstructed(Tag tag) {
   return (tag & kTagConstructionMask) == kTagConstructed;
 }
 
+uint8_t GetTagNumber(Tag tag) {
+  return tag & kTagNumberMask;
+}
+
 }  // namespace der
 
 }  // namespace net