RFR: 8044659: Java SecureRandom on SPARC T4 much slower than on x86/Linux

[Rob McKenna]

Hi folks,

When repeatedly gathering small amounts of random data the SUN provider 
is quicker ucrypto / pkcs11. This proposed fix from Brad allows ucrypto 
/ pkcs11 leverage the SUN SHA1 provider for SHA1PRNG. This allows us to 
avoid the overhead of calling into the native level repeatedly for small 
amounts of random data and allows ucrypto / pkcs11 to perform as well as 
SUN for this particular corner case.

Testcase attached to the bug.

http://cr.openjdk.java.net/~robm/8044659/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8044659

     -Rob