Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Commit d22b2999 broke the serializer unittests with certain
versions of simplejson. This patch removes sort_keys again
and implements a slightly more efficient way of detecting
simplejson functionality. The serializer unittests no longer
use a partially broken mock, but rather a function to convert all
tuples to lists before comparing.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

The salt needs to be returned anyway, so we don't have to add another
key for the sender to recognize which request an answer is answering, so
all that infrastructure is useless. :(

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

This patch includes HMAC authenticated json messages to the serializer.
The new interface works on any json-encodable data type, and can sign it
with a private key and an optional salt. The same private key must be
used upon message loading to verify the message.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Reviewed-by: iustinp