[gnutls-devel] GnuTLS | Porting HPKE (!1749)

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Ajit Singh commented on a discussion on lib/nettle/hpke/hpke-hkdf.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/1749#note_1439549677

> +                           struct ecc_scalar *sk, struct ecc_point *pk)
> +{
> +  int r = 1, counter = 0;
> +  uint8_t *dkp_prk = NULL, *bytes = NULL;
> +  mpz_t z;
> +
> +  mpz_init (z);
> +
> +  dkp_prk = _nettle_labeled_extract_kem (NULL, "dkp_prk", ikm, ikm_len,
> +                                         dhkem);
> +  if (!dkp_prk)
> +    {
> +      r = 0;
> +      goto out;
> +    }
> +  while (ecc_scalar_set((struct ecc_scalar *)dhkem, z))

since we do not have ecc-internal.h in system nettle lib(usr/include/nettle), this header file contains the required `struct ecc_curve` by `dhkem->ecc`. Therefore to bypass its usage, this loop condition rewritten using  `ecc_scalar_set` https://git.lysator.liu.se/nettle/nettle/-/blob/master/ecc-scalar.c#L55

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