В рабочей версии допускается использование сертификатов 
с алгоритмами подписей - ГОСТ Р 34.10-2012 с длиной ключа 256 бит.

alexander@debian:/usr/bin$ ./ips_server
Client Accepted
140371335132792:error:26078067:engine routines:ENGINE_LIST_ADD:conflicting engine id:eng_list.c:118:
140371335132792:error:2606906E:engine routines:ENGINE_add:internal list error:eng_list.c:268:
140371335132792:error:0609E09C:digital envelope routines:PKEY_SET_TYPE:unsupported algorithm:p_lib.c:239:
140371335132792:error:0B07706F:x509 certificate routines:X509_PUBKEY_get:unsupported algorithm:x_pubkey.c:148:
140371335132792:error:140BF10C:SSL routines:SSL_SET_CERT:x509 lib:ssl_rsa.c:399:
140371335132792:error:0609E09C:digital envelope routines:PKEY_SET_TYPE:unsupported algorithm:p_lib.c:239:
140371335132792:error:0606F076:digital envelope routines:EVP_PKCS82PKEY:unsupported private key algorithm:evp_pkey.c:84:TYPE=1.2.643.7.1.1.1.1
140371335132792:error:0907B00D:PEM routines:PEM_READ_BIO_PRIVATEKEY:ASN1 lib:pem_pkey.c:142:
140371335132792:error:140B0009:SSL routines:SSL_CTX_use_PrivateKey_file:PEM lib:ssl_rsa.c:649:
Private key does not match the certificate public key
I_ACCEPTED socket = 14
Delete Client, ClientsCount=0

			CClient(const SOCKET hSocket, const bool bIsSSL) :
				m_hSocket(hSocket), m_bIsSSL(bIsSSL), m_pSSLContext(NULL), m_pSSL(NULL)
			{
				SET_NONBLOCK(hSocket);
				if (m_bIsSSL)
                {
					m_pSSLContext = SSL_CTX_new (SSLv23_server_method());

					if (!m_pSSLContext)
                        ERR_print_errors_fp(stderr);
                    else
                    {
                        if (SSL_CTX_use_certificate_file(m_pSSLContext, CERTF, SSL_FILETYPE_PEM) <= 0)
                            ERR_print_errors_fp(stderr);
                        //else
                        {
                            if (SSL_CTX_use_PrivateKey_file(m_pSSLContext, KEYF, SSL_FILETYPE_PEM) <= 0)
                                ERR_print_errors_fp(stderr);

                            //else
                                if (!SSL_CTX_check_private_key(m_pSSLContext))
                                    cout << "Private key does not match the certificate public key\n";
                        }
                    }
				}
				CleanAndInit();
			}

	ENGINE_load_builtin_engines();

	OPENSSL_add_all_algorithms_noconf();
	engine_gost = ENGINE_by_id("dynamic");
	if (!engine_gost)
	{
		ENGINE_load_dynamic();
		engine_gost = ENGINE_by_id("dynamic");
	}

	OPENSSL_add_all_algorithms_conf();
	engine_gost = ENGINE_by_id(szEngineName.mbc_str());
	if (!engine_gost)
		goto err;

ok:
	if (!ENGINE_init(engine_gost))
		goto err;

	// WARNING: крайне нужный вызов
	ENGINE_add(engine_gost);

	ENGINE_set_default(engine_gost, ENGINE_METHOD_ALL);
	OpenSSL_add_all_algorithms();

	ENGINE_set_default_string(engine_gost, "ALL");