kexgex_client
int kexgex_client(struct ssh *);
c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;