Add length field to serialised signature.

This seems to contradict the spec but is something Googles reference
implementation does.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/plop.erl b/src/plop.erl
index e1c1382..30df046 100644
--- a/src/plop.erl
+++ b/src/plop.erl
@@ -401,9 +401,12 @@ serialise(#sig_and_hash_alg{
     [<<HashAlg:8, SignatureAlg:8>>];
 serialise(#signature{
              algorithm = Algorithm,
-             signature = Signature
+             signature = Signature              % DER encoded.
              }) ->
-    [serialise(Algorithm), <<Signature/binary>>].
+    SigLen = size(Signature),
+    [serialise(Algorithm),
+     <<SigLen:16>>,
+     Signature/binary].
 
 %%%%%%%%%%%%%%%%%%%%
 %% Tests.