[jdk8u-dev] RFR: 8320597: RSA signature verification fails on signed data that does not encode params correctly

[Alexey Bakhtin]

Almost clean backport from [JDK11 PR](https://github.com/openjdk/jdk11u-dev/pull/2384)
the only differences in the removed decodeSignature() method

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

Depends on: https://git.openjdk.org/jdk8u-dev/pull/403

Commit messages:
 - Backport 11e4a925bec3c1f79e03045d48def53188b655e6

Changes: https://git.openjdk.org/jdk8u-dev/pull/404/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=404&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320597
  Stats: 85 lines in 2 files changed: 66 ins; 8 del; 11 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/404.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/404/head:pull/404

PR: https://git.openjdk.org/jdk8u-dev/pull/404