That depends on you, which provider are you using? The pure Java one has the Java set of providers and the one with I5 in the name uses the OS provided ciphers. That said, I don't believe that Tomcat would offer a cipher that the JSSE provider wasn't providing. There are tools you can use to connect and find out what Tomcat is actually advertising. I seem to recall nmap being able to do that if you are allowed to run that in your environment (I am not.)

Coy Krill
Core Processing Administrator/Analyst
Washington Trust Bank

-----Original Message-----
From: JAVA400-L [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of James H. H. Lampert
Sent: 2017 October 16 13:36
To: Java Programming on and around the IBM i
Subject: Re: Question about JSSE on Midrange boxes
Importance: Low

On 10/16/17, 12:17 PM, Charles Wilt wrote:
What do you mean, where JSSE "gets its ciphers"?

I should think my meaning should be self-explanatory:

Does JSSE on a Midrange JRE implement its ciphers internally, as with any normal JRE? Or does it somehow defer the implentation to the OS's cipher support?

The reason being that, to rephrase what I said, I have reason to believe that the problem one of our customers experienced was the result of the JRE claiming (to a Tomcat server it was running) that it could support ECDHE ciphers it couldn't actually implement when asked (by a browser) to do so.

Whether there's a way to remedy this within an OS release is irrelevant; the immediate problem was solved by adding a "ciphers" clause to the relevant connection tag in the Tomcat server's server.xml file.

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