- EC_GROUP_cmp shouldn't consider curves equal just because
      the curve name is the same. (They really *should* be the same
      in this case, but there's an EC_GROUP_set_curve_name API,
      which could be misused.)

    - EC_POINT_cmp shouldn't return 0 for ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED
      or EC_R_INCOMPATIBLE_OBJECTS errors because in a cmp API, 0 indicates
      equality (not an error).

    Reported by: king cope

PR: 3110
Submitted by Corinna Vinschen.

Add callbacks supporting generation and retrieval of supplemental data entries, facilitating RFC 5878 (TLS auth extensions)
Removed prior audit proof logic - audit proof support was implemented using the generic TLS extension API
Tests exercising the new supplemental data registration and callback api can be found in ssltest.c.
Implemented changes to s_server and s_client to exercise supplemental data callbacks via the -auth argument, as well as additional flags to exercise supplemental data being sent only during renegotiation.

RT: 2582, 2850

Submitted by: David Miller, Andy Polyakov

Submitted by: David Miller

Submitted by: David Miller

PR: 2838

for debugging purposes. Needs "enable-ssl-trace" configuration option.

tested, because kernel is not in shape to handle it *yet*. The code is
committed mostly to stimulate the kernel development.