Add new constructor to HKDF that allows the client and server key/IV

Add new constructor to HKDF that allows the client and server key/IV
lengths to be different.

Committed: https://crrev.com/0db8686bdf6275fc54581bd7ffbbf796faa8f646
Cr-Commit-Position: refs/heads/master@{#388912}

[Ryan Hamilton, 2016-04-21 20:08:43]

rch@chromium.org changed reviewers:
+ davidben@chromium.org

[Ryan Hamilton, 2016-04-21 20:08:43]

As discussed, here's the HKDF CL. But I look forward to the elimination of HKDF
in favor of using boringSSL directly! :>

[davidben, 2016-04-21 20:12:53]

lgtm

[Ryan Hamilton, 2016-04-21 20:13:21]

The CQ bit was checked by rch@chromium.org

[commit-bot: I haz the power, 2016-04-21 20:13:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1904163003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1904163003/20001

[commit-bot: I haz the power, 2016-04-21 20:35:38]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-04-21 20:35:39]

Try jobs failed on following builders:
  linux_chromium_compile_dbg_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Ryan Hamilton, 2016-04-21 20:42:41]

The CQ bit was checked by rch@chromium.org

[commit-bot: I haz the power, 2016-04-21 20:43:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1904163003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1904163003/20001

[commit-bot: I haz the power, 2016-04-21 21:51:54]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-04-22 19:40:00]

Description was changed from

==========
Add new constructor to HKDF that allows the client and server key/IV
lengths to be different.
==========

to

==========
Add new constructor to HKDF that allows the client and server key/IV
lengths to be different.

Committed: https://crrev.com/0db8686bdf6275fc54581bd7ffbbf796faa8f646
Cr-Commit-Position: refs/heads/master@{#388912}
==========

[commit-bot: I haz the power, 2016-04-22 19:40:01]

Patchset 2 (id:??) landed as
https://crrev.com/0db8686bdf6275fc54581bd7ffbbf796faa8f646
Cr-Commit-Position: refs/heads/master@{#388912}