Serialisation code for Certificate Transparency data

net/cert/signed_tree_head.h

Index: net/cert/signed_tree_head.h
diff --git a/net/cert/signed_tree_head.h b/net/cert/signed_tree_head.h
index fdbcdc48499c4f439cac0471ffe32be81fe41295..8eae3a21aa0c74cc33a0c59b8354682f5e25b979 100644
--- a/net/cert/signed_tree_head.h
+++ b/net/cert/signed_tree_head.h
@@ -5,6 +5,7 @@
 #ifndef NET_CERT_SIGNED_TREE_HEAD_H_
 #define NET_CERT_SIGNED_TREE_HEAD_H_
 
+#include <ostream>
 #include <string>
 #include <vector>
 
@@ -26,15 +27,39 @@ struct NET_EXPORT SignedTreeHead {
   // RFC6962-bis to use separate versions, so using a separate scheme here.
   enum Version { V1 = 0, };
 
+  SignedTreeHead();
+  SignedTreeHead(Version version,
+                 const base::Time& timestamp,
+                 uint64_t tree_size,
+                 const char sha256_root_hash[kSthRootHashLength],
+                 const DigitallySigned& signature,
+                 const std::string& log_id);
+  ~SignedTreeHead();
+
   Version version;
   base::Time timestamp;
   uint64_t tree_size;
   char sha256_root_hash[kSthRootHashLength];
   DigitallySigned signature;
+
+  // Added in RFC6962-bis, Appendix A
+  std::string log_id;
 };
 
+// Two STHs are considered equal if they are from the same log and have matching
+// timestamps, since RFC6962 forbids a log from issuing two different STHs with
+// the same timestamp.
+NET_EXPORT bool operator==(const SignedTreeHead& sth1,
+                           const SignedTreeHead& sth2);
+NET_EXPORT bool operator!=(const SignedTreeHead& sth1,
+                           const SignedTreeHead& sth2);
+
+NET_EXPORT std::ostream& operator<<(std::ostream& stream,
+                                    const SignedTreeHead& sth);
+
 }  // namespace ct
 
 }  // namespace net
 
-#endif
+#endif  // NET_CERT_SIGNED_TREE_HEAD_H_
+