OSSL_PARAM_BUF_SECURE
if (buf[OSSL_PARAM_BUF_SECURE].blocks > 0
&& !ossl_param_buf_alloc(&buf[OSSL_PARAM_BUF_SECURE], 0, 1)) {
ossl_param_set_secure_block(last, buf[OSSL_PARAM_BUF_SECURE].alloc,
buf[OSSL_PARAM_BUF_SECURE].alloc_sz);
#define OSSL_PARAM_BUF_MAX (OSSL_PARAM_BUF_SECURE + 1)