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Environment - PHP extension sodium

From MoodleDocs

The php-sodium extension provides strong encryption capabilities in an easy and consistent way.

Note that, for sites not having the extension installed, a php-openssl based solution, considered suboptimal, is used, and this fallback will stop working in a few versions (Moodle 4.2). See MDL-71421 for more details.

Hence, it's highly recommended to start using php-sodium.

See also and