Reviewed by: steve
Improved localisation of TLS extension handling and code tidy.

(TLS 1.2 clients could end up negotiating these with an OpenSSL server
with TLS 1.2 disabled, which is problematic.)

Submitted by: Adam Langley

If OPENSSL_MAX_TLS1_2_CIPHER_LENGTH is set then limit the size of client
ciphersuites to this value. A value of 50 should be sufficient.

Document workarounds in CHANGES.

Some servers hang when presented with a client hello record length exceeding
255 bytes but will work with longer client hellos if the TLS record version
in client hello does not exceed TLS v1.0. Unfortunately this doesn't fix all
cases...

PR: 2791
Submitted by: Ben Noordhuis

PR: 2538

countermeasure.

PR: 2778

Localize client hello extension parsing in t1_lib.c

enabled instead of requiring an application to hard code a (possibly
inappropriate) parameter set and delve into EC internals we just
automatically use the preferred curve.

PR: 2778

add utility functions to t1_lib.c to check if EC certificates and parameters
are consistent with peer.

Submitted by: John Fitzgibbon <john_fitzgibbon@yahoo.com>

Time is always encoded as 4 bytes, not sizeof(Time).

Tidy some code up.

Don't allocate a structure to handle ECC extensions when it is used for
default values.

Make supported curves configurable.

Add ctrls to retrieve shared curves: not fully integrated with rest of
ECC code yet.

Add more extension names in s_cb.c extension printing code.

Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>

Fix DTLS timeout handling.

extensions to s_client and s_server to print out retrieved valued.

Extend CERT structure to cache supported signature algorithm data.

Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>

Reduce MTU after failed transmissions.

Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>

Fix possible DTLS timer deadlock.

Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>

Fix padding bugs in Heartbeat support.

Move new structure fields to end of structures.

before rejecting multiple SGC restarts.

Further fixes for use_srtp extension.

Submitted by: Peter Sylvester <peter.sylvester@edelweb.fr>

Fix srp extension.

Fix encoding of use_srtp extension to be compliant with RFC5764

some servers.

structure.

Before this the only way to add a custom chain was in the parent SSL_CTX
(which is shared by all key types and SSL structures) or rely on auto
chain building (which is performed on each handshake) from the trust store.