C++ XML file encryption GOST 28147-89

Employer
[no-member:pro]Aleksandr[/no-member:pro]
Project parameters
Type of cooperationOne-time project
SectionSoftware development
Prepaymentwithout prepayment
Payment methodsCash, Bank transfer, Electronic money
Acceptance of requestsfrom Feb 17, 2020 until Mar 6, 2020
Project description
Programmer services are required. Need a function for encrypting an XML file by the algorithm GOST 28147-89
XML Encryption Syntax and Processing (W3C)
I mean. at the input of the XML file function, at the output of the encrypted XML file
The function is required in C++ to compile under WIndows/MAC/Linux.
I managed to use openssl and xmlsec to make a signature GOST-om, but encrypting an XML file mind is not enough
Use of openssl, xmlsec, wxwidgets is welcome
XML Encryption Syntax and Processing (W3C)
I mean. at the input of the XML file function, at the output of the encrypted XML file
The function is required in C++ to compile under WIndows/MAC/Linux.
I managed to use openssl and xmlsec to make a signature GOST-om, but encrypting an XML file mind is not enough
Use of openssl, xmlsec, wxwidgets is welcome