Environment - PHP extension sodium

The php-sodium extension provides strong encryption capabilities in an easy and consistent way. This extension is required from Moodle 4.2.

Note that it is still highly recommended to use php-sodium in Moodle 3.11, 4.0 and 4.1, which also support the extension. Sites which do not have this extension installed use a php-openssl based solution as a fallback, which is considered sub-optimal. See MDL-71421 for more details.

Microsoft Windows

It might be useful to copy the server\php\libsodium.dll library to \server\apache\bin\libsodium.dll as mentioned in this forum discussion. Alternatively add the php folder to the system path.

See also

PHP: Sodium - Manual and the libsodium installation page.