gnutls_certificate_allocate_credentials(&gnutls_channel->cred);
gnutls_credentials_set(gnutls_channel->session,
GNUTLS_CRD_CERTIFICATE, gnutls_channel->cred);
gnutls_certificate_allocate_credentials(&gnutls_channel->cred);
gnutls_credentials_set(gnutls_channel->session,
GNUTLS_CRD_CERTIFICATE, gnutls_channel->cred);