[crit] 6945#6945: *1 SSL_do_handshake() failed (SSL: error:0B09407D:x509 certificate routines:x509_pubkey_decode:public key decode error error:1416F0EF:SSL routines:tls_process_server_certificate:unable to find public key parameters) while SSL handshaking to upstream

root@113a297485db:/# nginx -V
nginx version: nginx/1.16.1
built by gcc 8.3.0 (Debian 8.3.0-6) 
built with OpenSSL 1.1.0g-dev  xx XXX xxxx
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --user=root --group=nginx --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fPIC' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -pie'

root@113a297485db:/# dpkg-query --list | grep csp
ii  cprocsp-cpopenssl-110-64         4.0.0-5                     amd64        OpenSSL-110. Build 9920.
ii  cprocsp-cpopenssl-110-base       4.0.0-5                     all          Openssl-110 common Build 9920.
ii  cprocsp-cpopenssl-110-devel      4.0.0-5                     all          Openssl-110 devel Build 9920.
ii  cprocsp-cpopenssl-110-gost-64    4.0.0-5                     amd64        OpenSSL-110 capi_gost engine. Build 9920.
ii  cprocsp-curl-64                  4.0.9963-5                  amd64        CryptoPro Curl shared library and binaris. Build 9963.
ii  lsb-cprocsp-base                 4.0.9963-5                  all          CryptoPro CSP directories and scripts. Build 9963.
ii  lsb-cprocsp-ca-certs             4.0.9963-5                  all          CA certificates.  Build 9963.
ii  lsb-cprocsp-capilite-64          4.0.9963-5                  amd64        CryptoAPI lite. Build 9963.
ii  lsb-cprocsp-kc1-64               4.0.9963-5                  amd64        CryptoPro CSP KC1. Build 9963.
ii  lsb-cprocsp-rdr-64               4.0.9963-5                  amd64        CryptoPro CSP readers. Build 9963.

root@113a297485db:/# /opt/cprocsp/cp-openssl-1.1.0/bin/amd64/openssl engine
(rdrand) Intel RDRAND engine
(dynamic) Dynamic engine loading support
(gostengy) CryptoPro GostEngy ($Revision: 164682 $)

user root;

events {
    worker_connections 1024;
    multi_accept on;
}

http {

    log_format main '"\$time_local" client=\$remote_addr '
                   'method=\$request_method request="\$request" '
                   'request_length=\$request_length '
                   'status=\$status bytes_sent=\$bytes_sent '
                   'body_bytes_sent=\$body_bytes_sent '
                   'referer=\$http_referer '
                   'user_agent="\$http_user_agent" '
                   'upstream_addr=\$upstream_addr '
                   'upstream_status=\$upstream_status '
                   'request_time=\$request_time '
                   'upstream_response_time=\$upstream_response_time '
                   'upstream_connect_time=\$upstream_connect_time '
                   'upstream_header_time=\$upstream_header_time';

    access_log  /var/log/nginx/access.log  main;
    error_log  /var/log/nginx/error.log warn;

    server {
        listen 80;
        server_name localhost;
        proxy_http_version 1.1;

        location /get {
            proxy_set_header Content-Type "application/x-www-form-urlencoded; Charset=windows-1251";
            proxy_set_header Connection "Close";

            proxy_ssl_verify on;
            proxy_ssl_trusted_certificate /etc/nginx/root.pem;
            proxy_ssl_certificate /etc/nginx/test_user.pem;
            proxy_ssl_certificate_key engine:gostengy:Тестовый;
            proxy_ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
            proxy_ssl_ciphers GOST2012-GOST8912-GOST8912:GOST2001-GOST89-GOST89:HIGH;

            proxy_pass https://test.db.local/get;
        }
    }
}