How to automate the drawing of polygons (square) around a number of points in QGIS?

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In QGIS (or alternatively any other scripting + GIS stack), how can I automate drawing a 100km x 100km square around a number of points, with the point being dead in the center?

I'd need to loop through all the points and create a polygon, but not sure what would be the automated way of doing so.

UPDATE: I was able to create buffers (circular) around the points, but now looking for a solution to convert those circles to squares -- something like the Envelope approach described here (but need it in QGIS): Creating a square buffer around a point feature in ArcMap



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