8278851: Correct signer logic for jars signed with multiple digest algorithms

[yan-too]

Backport for parity with major releases. Some context changes were necessary in source part; private toHex function was used instead of HexFormat; and I borrowed test/lib/jdk/test/lib/security/SecurityUtils.java from JDK 11.
All JDK security tests run OK.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8278851: Correct signer logic for jars signed with multiple digest algorithms

Reviewers

• Andrew Brygin (@bae - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk15u-dev pull/202/head:pull/202
$ git checkout pull/202

Update a local copy of the PR:
$ git checkout pull/202
$ git pull https://git.openjdk.java.net/jdk15u-dev pull/202/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 202

View PR using the GUI difftool:
$ git pr show -t 202

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk15u-dev/pull/202.diff

[bridgekeeper]

👋 Welcome back yan! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (914c2629)

[bae]

Looks fine.

[openjdk]

@yan-too This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8278851: Correct signer logic for jars signed with multiple digest algorithms

Reviewed-by: bae

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 1 new commit pushed to the master branch:

• a6be0e0: 8285445: cannot open file "NUL:"

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[yan-too]

/integrate

[openjdk]

Going to push as commit d148e26.
Since your change was applied there has been 1 commit pushed to the master branch:

• a6be0e0: 8285445: cannot open file "NUL:"

Your commit was automatically rebased without conflicts.

[openjdk]

@yan-too Pushed as commit d148e26.

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