How to sign SOAP messages in PHP according to the GOST algorithm?

Question

PHP

Hello. I am developing an application in PHP for exchanging data with public services.
I raise a secure channel through stunnel from the CryptoPRO package.
It is required that each SOAP message be signed with an EDS according to GOST according to the xmldsig standard.
But all the libraries and modules for PHP I found do not support signing xml according to GOST.
In what way can this be implemented? And in what direction do you dig? I have never dealt with cryptography before.

Answer 1

Are you going to encode on the server? And let the EDS walk to the server through an open channel?)
Where is the EDS stored? not on a USB token by any chance?
It cannot be that your portal does not provide recommendations for developers. Love something must be.