[gnutls-devel] GnuTLS | nettle: port upstream hardening of EC point multiplication [3.6.x] (!1407)

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Daiki Ueno commented on a discussion on lib/nettle/ecc/override/ecc-mod-arith.c.diff: https://gitlab.com/gnutls/gnutls/-/merge_requests/1407#note_572099422

> +--- a/ecc-mod-arith.c
> ++++ b/ecc-mod-arith.c
> +@@ -125,3 +125,14 @@ ecc_mod_sqr (const struct ecc_modulo *m, mp_limb_t *rp,
> +   mpn_sqr (rp, ap, m->size);
> +   m->reduce (m, rp);
> + }
> ++
> ++void
> ++ecc_mod_mul_canonical (const struct ecc_modulo *m, mp_limb_t *rp,
> ++		       const mp_limb_t *ap, const mp_limb_t *bp, mp_limb_t *tp)
> ++{
> ++  mp_limb_t cy;
> ++  ecc_mod_mul(m, tp, ap, bp);
> ++
> ++  cy = mpn_sub_n (rp, tp, m->m, m->size);
> ++  cnd_copy (cy, rp, tp, m->size);

Thank you; that makes things much clearer. I've applied those changes.

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