JEP 244: TLS Application-Layer Protocol Negotiation Extension
Xuelei Fan
xuelei.fan at oracle.com
Mon Apr 13 23:51:38 UTC 2015
On 4/14/2015 2:25 AM, Thomas Lußnig wrote:
> Hi,
>
> i checked the CipherSuites in JDK and found that in the JDK there is and
> mistake i think.
> In CipherSuite the method add set the PRF to NONE only if obsoleted less
> than TLSv1.2.
> But if the suite is forbidden / obsoleted in TLSv1.2 the check must be
> <= (less or equal)
Can you explain more about this point?
Xuelei
> if i am correct.
>
> http://grepcode.com/file_/repository.grepcode.com/java/root/jdk/openjdk/8-b132/sun/security/ssl/CipherSuite.java/?v=source
>
> /*
> * Use this method when there is no lower protocol limit where this
> * suite can be used, and the PRF is P_SHA256. That is, the
> * existing ciphersuites. From RFC 5246:
> *
> * All cipher suites in this document use P_SHA256.
> */
> private static void add(String name, int id, int priority,
> KeyExchange keyExchange, BulkCipher cipher,
> boolean allowed, int obsoleted) {
> // If this is an obsoleted suite, then don't let the TLS 1.2
> // protocol have a valid PRF value.
> PRF prf = P_SHA256;
> if (obsoleted < ProtocolVersion.TLS12.v) {
> prf = P_NONE;
> }
>
> add(name, id, priority, keyExchange, cipher, allowed, obsoleted,
> ProtocolVersion.LIMIT_MIN_VALUE, prf);
> }
>
> Gruß Thomas
>
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