Validate signature from string

Hello,

We would need to handle the following use case:

A system replies to our GET with a list of codes and a signature.

Each code has been signed with the SHA512withECDSA algorithm

We would need to:

1 Concatenate all codes in a string

2 Decode the string which is in Base 64

3 Validate the string using the signature which we get in the reply

We have read for step 2:

Base64Decode

https://cedocs.intersystems.com/latest/csp/documatic/%25CSP.Documatic.c…

For step 3 we have found:

This example at "Validating a Signature" which validates the <Signature> element in an XML

https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.cl…

➡️ Could you show us some documentation or examples which could help us?

How would you validate that the string which contains all the code has been signed with the algorithm?