[openssl-dev] [openssl.org #2937] Handshake performance degradation in 1.0.1 and up.

[Rich Salz via RT]

The patches were large and added new features and API's which isn't appropriate
for bugfix releases.

In the master branch, branch the PRF functionality has been redirected to
libcrypto so it's possible it can be optimised by using a more efficient
implementation in crypto/kdf or in an engine. There is already one
optimisation: the number of updates should be reduced because all the seed
values are now concatenated
--
Rich Salz, OpenSSL dev team; rsalz at openssl.org