RFR: 8377318: Force bad padding exception in TestPKCS5PaddingError.java at all times [v2]

[Mikhail Yankelevich]

> Currently implementation of the test relies on changing the last byte of the cypher to mess up the padding lines. However if the last bit is already 0 the padding will not be taken into account and the result will have no error but will be a garbage output. Current test doesn't take this into account. 
> 
> The fix should encode the test text without padding and decode with padding to make sure that the bad padding exception is thrown.
> 
> Kudos to @djelinski for assisting with finding the issue vs RFC!
> 
> Also added a bug id which was missing

Mikhail Yankelevich has updated the pull request incrementally with one additional commit since the last revision:

  changed warning

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/29612/files
  - new: https://git.openjdk.org/jdk/pull/29612/files/10afb4a1..e956a0a8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29612&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29612&range=00-01

  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29612.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29612/head:pull/29612

PR: https://git.openjdk.org/jdk/pull/29612