How to implement authorization through EDS?

Question

Electronic digital signature

Hello, could you please tell me how the authorization through the EDS is implemented?
Or are there libraries?
UPD: that is, user authentication via digital signature

Answer 1

EDS is used to verify documents, not users.

Answer 2

The simplest option:
1. The server generates a random number and sends it to the client;
2. The client signs this number and sends it to the server;
3. The server checks the authenticity of the EDS using the public key of the client;