You can compile the plugin on your server since the plugin is open-source. This should fix that issue.
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I merged two topics.
And here is a Squirrel implemention of sha256.
I don't know if there is any bug. Still need more tests.
Credit to B-Con for original code.
Edit: And sha1. https://gist.github.com/ysc3839/187c3bf6f27bcfc1fccd783bc9b717fc