SSL_CTX_set1_client_cert_type
if (!SSL_CTX_set1_client_cert_type(ctx, cert_type_rpk, sizeof(cert_type_rpk))) {
__owur int SSL_CTX_set1_client_cert_type(SSL_CTX *ctx, const unsigned char *val, size_t len);
if (!TEST_true(SSL_CTX_set1_client_cert_type(sctx, cert_type_rpk, sizeof(cert_type_rpk))))
if (!TEST_true(SSL_CTX_set1_client_cert_type(cctx, cert_type_rpk, sizeof(cert_type_rpk))))