RFR: 8258915: Temporary buffer cleanup [v4]

[Weijun Wang]

> Clean up temporary byte array, char array, and keyspec around keys and passwords.
> 
> No new regression test.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  keyfactory operations on own keyspec

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2070/files
  - new: https://git.openjdk.java.net/jdk/pull/2070/files/b7216061..9b17b1a2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2070&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2070&range=02-03

  Stats: 57 lines in 7 files changed: 34 ins; 2 del; 21 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2070.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2070/head:pull/2070

PR: https://git.openjdk.java.net/jdk/pull/2070