RFR 8168518: rcache interop with krb5-1.15

[Wang Weijun]

http://cr.openjdk.java.net/~weijun/8168518/webrev.00/

Please read https://bugs.openjdk.java.net/browse/JDK-8168518 for the reason. This code change includes:

1. Add a hashAlg field in AuthTimeWithHash.java.

2. Add AuthTimeWithHash.DEFAULT_HASH_ALG so we can change it later.

3. The fix of the bug is inside DflCache.java:

@@ -300,7 +302,7 @@

   if (time.equals(a)) {
       // Exact match, must be a replay
       throw new KrbApErrException(Krb5.KRB_AP_ERR_REPEAT);

-  } else if (time.isSameIgnoresHash(a)) {
+  } else if (time.sameTimeDiffHash((AuthTimeWithHash)a)) {

      // Two different authenticators in the same second.
      // Remember it
      seeNewButNotSame = true;

When a AuthTimeWithHash is seen with a different hash, we believe it's a new one. Before this fix, we simply compare the HASH string. Now that the algorithm can be different, we only treat it a new one if the algorithm is the same and the hash value is different.

This code change has not tried to understand what a different hashAlg means and try to re-calculate with it. It is just treated as unknown.

Tests updated. ReplayCacheTestProc.java enhanced so it can be called with some special system properties to test interop between a non-system-default native library or even between 2 different native libraries.

Thanks
Max