RFR: 8313367: SunMSCAPI cannot read Local Computer certs w/o Windows elevation

[rebarbora-mckvak]

On Thu, 16 Nov 2023 12:06:26 GMT, rebarbora-mckvak <duke at openjdk.org> wrote:

> This fixes the defect described at https://bugs.openjdk.org/browse/JDK-8313367
> 
> If the process does not have write permissions, the store is opened as read-only (instead of failing).
> 
> Please note that permissions to use a certificate in a local machine store must be granted - in a management console, select a certificate, right-click -> All tasks... -> Manage Private Keys... -> add Full control to user.

I have encountered a related problem on my customer's system. Depending on how private keys are imported in the store, either `signCngHash` or `signHash` is used. `signHash` fails to find the key, because it does not look at local machine's store. I will commit a fix for that soon in this PR.

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PR Comment: https://git.openjdk.org/jdk/pull/16687#issuecomment-1981903052