[crac] RFR: Reseed secure random on checkpoint restore [v7]

[Anton Kozlov]

On Fri, 28 Jan 2022 12:55:12 GMT, Alexey Bakhtin <abakhtin at openjdk.org> wrote:

>> Proposed changes in the SecureRandom implementation allow invalidating and reseeding SHA1PRNG secure random during checkpoint/restore. SHA1PRNG can be invalidated and reseeded in case of being created with a default embedded seed generator. Also, SHA1PRNG is used as an additional seed generator to the SUN NativePRNG implementation, so it is desirable to have reseeded SHA1PRNG after restore.
>> Two jtreg tests added: 
>> - verify if no deadlocks introduced by checkpoint/restore
>> - verify if SHA1PRNG is reseeded if created with default embedded seed generator
>
> Alexey Bakhtin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Exclude CheckpointException from import

Looks good to me!

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Marked as reviewed by akozlov (Lead).

PR: https://git.openjdk.java.net/crac/pull/7