Is a private key needed?

Question

PHP

Good afternoon,
there is a task to make authorization in the information system through esia using Oauth 2.0. The IS is developed in PHP.
Is it necessary to use a private key in our case? Maybe someone implemented without a private key?
Maybe there are ready-made libraries?
Those that I found on the net imply the presence of a private key.

Answer 1

I don’t know how it is in the ESIA, but usually SSL involves a pair of keys - personal (private) and public (open). They are generated in pairs , they are required to approach each other. A public key without a private key is so meaningless that it is distributed with every connection. Leakage of the private key means a complete fail and the need to generate a new pair.
Now think - is it possible without it :)