RFR[11] JDK-8205720 "KeyFactory#getKeySpec and translateKey thorws NullPointerException with Invalid key"

[Valerie Peng]

Xuelei,

Can you please help reviewing this fix for JCK test failures? 
Essentially, the JCK tests use key created with null algorithm, 
encoding, and format for triggering InvalidKeyException. However, the 
SunRsaSign provider code throw NPE so test failures are observed. Null 
checks are added to various places to detect and check 
InvalidKeyException instead. Fixes have been verified against the failed 
JCK tests.

Bug: https://bugs.openjdk.java.net/browse/JDK-8205720
Webrev: http://cr.openjdk.java.net/~valeriep/8205720/webrev.00/

Thanks,
Valerie

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