RFR: 8367782: VerifyJarEntryName.java: Fix modifyJarEntryName to operate on bytes and re-introduce verifySignatureEntryName

Tue Sep 16 17:42:28 UTC 2025

Hi, this is a second take of [JDK-8353299](https://bugs.openjdk.org/browse/JDK-8353299 "VerifyJarEntryName.java test fails") (#24337, acd4da49a01760599ec4c325ff6c56f53ba5cc9c), by making `modifyJarEntryName` operate on bytes and re-introduce `verifySignatureEntryName`.

Please see [this JDK-8353299 comment](https://bugs.openjdk.org/browse/JDK-8353299?focusedId=14817153&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14817153) for further explanation.

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Commit messages:
 - 8367782: VerifyJarEntryName.java: Fix modifyJarEntryName to operate on bytes and re-introduce verifySignatureEntryName

Changes: https://git.openjdk.org/jdk/pull/27319/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27319&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367782
  Stats: 27 lines in 1 file changed: 22 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/27319.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27319/head:pull/27319

PR: https://git.openjdk.org/jdk/pull/27319