Dynamic expression to encode and decode in logic app

I am looking equivalent function encoding decoding my content for content-Md5 property of my blob. I tried Base64ToString and I get this

O؈�T�eK̲; x���*

See the sample code in c# below. I am looking to achieve same functionality for my input in logic app:

 var hashStr = "INDiTF0Nq8hU6d4fHqu1dQ==";
 var hash = Convert.FromBase64String( hashStr );
 var sb = new StringBuilder();
    
 foreach( var b in hash )
 {
     sb.Append( b.ToString("X2") );
 }
 sb.ToString().Dump();

I get output as 20D0E24C5D0DABC854E9DE1F1EABB575

How to built dynamic expression to get same output in logic app when I have my string value "INDiTF0Nq8hU6d4fHqu1dQ=="

Note: remember the format is "X2"

Thanks

According to some test, it seems difficult for us to implement the requirement in logic app by actions or expressions directly. So I suggest you to use azure function in your logic app.

You can create a new azure function app and create an HTTP trigger function in the function app.

Then you can write the same code in the HTTP trigger function, below is my function code:

Then go to your logic app and create function action in it, it will request the function which you created above to do the convert. My logic app show as below:

After running the logic app, the result show as: