Sign using ECDSA and fix a couple bugs.

Revive the plop_entry and hash over that instead of the full MTL, for
the db hash. We don't want the timestamp in that hash!

Use ECDSA instead of RSA for signing stuff. That's what Google does
and we want to use their test suites. An annoyance with DSA is that
the signature isn't deterministic. Testing just became less easy.

Fix db:find() now that the hash is no longer the primary key.

1 files changed, 12 insertions, 3 deletions

diff --git a/src/db.erl b/src/db.erl
index 857615c..3529080 100644
--- a/src/db.erl
+++ b/src/db.erl
@@ -51,8 +51,7 @@ dump_to_file(Filename) ->
     mnesia:dump_to_textfile(Filename).
 
 init(_Args) ->
-    {mnesia:wait_for_tables([plop], 5000),
-     []}.
+    {mnesia:wait_for_tables([plop], 5000), []}.
 
 start_link() ->
     gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
@@ -100,4 +99,14 @@ handle_call({dump, Table}, _From, State) ->
     Res = mnesia:transaction(F),
     {reply, Res, State};
 handle_call({find, Hash}, _From, State) ->
-    {reply, mnesia:dirty_read({plop, Hash}), State}.
+    F = fun() ->
+                mnesia:select(plop,
+                              [{#plop{hash = Hash, _='_'}, [], ['$_']}])
+        end,
+    {atomic, Result} = mnesia:transaction(F),
+    Record = case length(Result) of
+                 0 -> [];
+                 1 -> hd(Result);
+                 _ -> duplicate_hash_in_db      % FIXME: log an error
+             end,
+    {reply, Record, State}.