[8u] RFR 8238448: RSASSA-PSS signature verification fail when using certain odd key sizes

[Zhengyu Gu]

I would like to backport this patch to 8u for parity with Oracle 8u270.

The original patch does not apply cleanly.

1) All three modified files have up-to-date copyright lines in 8u.

2) Other than copyright line, SignatureTestPSS.java also has conflicts 
on bug/summary/run lines.

@@ -32,16 +32,18 @@

  /**
   * @test
- * @bug 8146293
- * @summary Create a signature for RSA and get its signed data. re-initiate
- *          the signature with the public key. The signature can be 
verified
- *          by acquired signed data.
+ * @bug 8146293 8238448
+ * @summary Create a signature for RSASSA-PSS and get its signed data.
+ *          re-initiate the signature with the public key. The signature
+ *          can be verified by acquired signed data.
   * @library /test/lib
   * @build jdk.test.lib.SigTestUtil
   * @run main SignatureTestPSS 512
   * @run main SignatureTestPSS 768
   * @run main SignatureTestPSS 1024
+ * @run main SignatureTestPSS 1025
   * @run main SignatureTestPSS 2048
+ * @run main SignatureTestPSS 2049
   * @run main/timeout=240 SignatureTestPSS 4096
   * @run main/timeout=240 SignatureTestPSS 5120
   * @run main/timeout=480 SignatureTestPSS 6144

The original bug: https://bugs.openjdk.java.net/browse/JDK-8238448
The original patch: https://hg.openjdk.java.net/jdk/jdk/rev/0469ead7113c

8u Webrev: http://cr.openjdk.java.net/~zgu/JDK-8238448-8u/webrev.00/

Test:
   passed tests in patch.

Thanks,

-Zhengyu