RFR: 8342181: Update tests to use stronger Key and Salt size [v3]

[Fernando Guallini]

> Several tests currently use weak key and salt sizes. Since the purpose of these tests is not to evaluate weak keys, they can be updated to use stronger keys length (2048-bits) and stronger Salt (16 bytes). This PR does not intend to update the tests to use stronger algorithms.
> 
> There is no significant increase in tests run time, those still complete consistently fast (few seconds).

Fernando Guallini has updated the pull request incrementally with one additional commit since the last revision:

  Convert bits to bytes when necessary

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21537/files
  - new: https://git.openjdk.org/jdk/pull/21537/files/6b186bd3..0fa31dd5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21537&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21537&range=01-02

  Stats: 15 lines in 4 files changed: 2 ins; 1 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/21537.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21537/head:pull/21537

PR: https://git.openjdk.org/jdk/pull/21537