Code review request JDK-8006935: Need to take care of long secret keys in HMAC/PRF compuation

[Weijun Wang]

>> No new regression test (noreg-hard). The fix can be tested by manually
>> running the attached test case in the bug.

By noreg-hard, do you mean that it's not easy to write a jdk7 client 
talking to a jdk8 server in regression test? I recommend you asking SQE 
to include some interop tests in their test suite.

Thanks
Max

>>
>> Thanks,
>> Xuelei
>