Update DMG data source credentials - how to encrypt with RSA-OAEP ?

[bdarbonneau]

I am trying to create or update Gateway data source credentials using Flow and a Power BI REST API custom connector.

The API endpoints  require that the credentials provided in the JSON body be encrypted using the gateway public key and the RSA-OAEP algorithm, but the documentation provides no directions to a pratical method for performing the encryption.

Despite many searches, I have not found anything. Any help would be welcome.