What is the recommended approach to compute a file checksum from a Microsoft Flow or Azure Logic Apps?
Here I need MD5 checksum but it would be interesting to know for other standard algorithms as well, such as SHA variants.
For this requirement, I suggest you to create an azure function and implement it in function code. Then you can call the function in your logic app. Here is a post similar with your requirement.
And for your requirement be implemented directly in logic app, you can also vote up for this feature on azure feedback page.