[gnutls-devel] GnuTLS | Use custom free/realloc for GMP to safely delete temporary secrets (!1554)

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Daiki Ueno started a new discussion on lib/includes/gnutls/gnutls.h.in: https://gitlab.com/gnutls/gnutls/-/merge_requests/1554#note_884328766

>  /* constant time memcmp */
>  int gnutls_memcmp(const void *s1, const void *s2, size_t n);
>  
> +/* a variant of free that also zeroizes freed memory */
> +void gnutls_free_zero(void *data, size_t size);

These are internal functions and should not be in the public header (I guess that is causing the doc-dist CI failure, which my previous comment didn't help with). Since they are only used in `lib/nettle/init.c`, maybe you could make them a static function?

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