[jdk17u-dev] RFR: 8320597: RSA signature verification fails on signed data that does not encode params correctly

[Alexey Bakhtin]

Backport is not clean because encodeSignature and decodeSignature methods belong to the RSASignature class ( not RSAUtil ).
This is the reason for no changes in the RSAUtil class.

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Depends on: https://git.openjdk.org/jdk17u-dev/pull/1864

Commit messages:
 - Backport 11e4a925bec3c1f79e03045d48def53188b655e6

Changes: https://git.openjdk.org/jdk17u-dev/pull/2052/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2052&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/jdk17u-dev/pull/2052.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2052/head:pull/2052

PR: https://git.openjdk.org/jdk17u-dev/pull/2052