Is it possible to check the digital signature on a Linux server?

Question

linux

Tell me how to check the EDS on the server?
Is it possible to do this with free software or advise paid something? Russian GOSTs must be supported.
The signature is created using the CryptoPro browser plugin.
I looked in the direction of OpenSSL with gost support (for the work of Russian GOSTs), maybe someone will comment on this option (plus there, a public key is needed to verify the signature, and I did not understand where to get it if, when generating a signature, only the original and encrypted come to the server message)?
ps it is desirable that this all work in Python

Answer 1

Here is an example from CryptoPro:
https://www.cryptopro.ru/faq/kakie-est-gotovye-uti...
See the entire list of their FAQ:
https://www.cryptopro.ru/category/faq/linuxunix-0

Answer 2

In fact, the public key will be needed in any case - does the digital signature need to be checked somehow? You need to apply the encryption algorithm to the original message and check if the result is the same as in the encrypted one.
And yes, openssl has the ability to check the digital signature and use the guest