[gnutls-devel] GnuTLS | Add ecdh compute function gnutls_ecdh_compute_key (!1395)

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Nicolas Mora commented on a discussion on lib/ecdh.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/1395#note_534050838

> + */
> +#include "gnutls_int.h"
> +#include <ecdh.h>
> +#include "errors.h"
> +
> +int gnutls_ecdh_compute_key(gnutls_privkey_t privkey, gnutls_pubkey_t pubkey, gnutls_datum_t *Z)
> +{
> +  gnutls_ecc_curve_t curve_pub = GNUTLS_ECC_CURVE_INVALID, curve_priv = GNUTLS_ECC_CURVE_INVALID;
> +  unsigned int bits_pub = 0, bits_priv = 0;
> +  gnutls_datum_t priv_x = {NULL, 0}, priv_y = {NULL, 0}, priv_k = {NULL, 0}, pub_x = {NULL, 0}, pub_y = {NULL, 0};
> +  int ret = GNUTLS_E_SUCCESS, res;
> +  
> +  Z->data = NULL;
> +  Z->size = 0;
> +  
> +  if (gnutls_privkey_get_pk_algorithm(privkey, &bits_priv) != GNUTLS_PK_ECDSA)

Curve25519/Curve448 don't have a 'y' coordinate, so `_gnutls_ecdh_compute_key` wouldn't work.

I can use `_gnutls_dh_compute_key` for Curve25519/Curve448 if I assume it's the right way.

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