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<p style="color: #777777;">
<a href="https://gitlab.com/nielsmoller">Niels Möller</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1407#note_571824730">lib/nettle/ecc/override/ecc-mod-arith.c.diff</a>:
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="diff"><span class="gd" style="color: #000; background-color: #fdd;">--- a/ecc-mod-arith.c</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+++ b/ecc-mod-arith.c</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="diff"><span class="p">@@ -125,3 +125,14 @@</span> ecc_mod_sqr (const struct ecc_modulo *m, mp_limb_t *rp,</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="diff"> mpn_sqr (rp, ap, m->size);</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="diff"> m->reduce (m, rp);</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="diff"> }</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+void</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+ecc_mod_mul_canonical (const struct ecc_modulo *m, mp_limb_t *rp,</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+ const mp_limb_t *ap, const mp_limb_t *bp, mp_limb_t *tp)</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+{</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+ mp_limb_t cy;</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+ ecc_mod_mul(m, tp, ap, bp);</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+ cy = mpn_sub_n (rp, tp, m->m, m->size);</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="diff"><span class="gi" style="color: #000; background-color: #dfd;">+ cnd_copy (cy, rp, tp, m->size);</span></span>
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<p dir="auto">This will not work if rp == tp (unlike the version on master). I think it can be made to be more of a drop-in replacement for ecc_mod_mul, without the new tp argument. Something like</p>
<p dir="auto">ecc_mod_mul (m, rp, ap, bp); /* clobbers 2*size limbs, size limbs final result <em>/
cy = mpn_sub_n (rp + m->size, rp, m->m, m->size); /</em> area at rp + m->size now free to reuse */
cnd_copy (!cy, rp, rp + m->size, m->size);</p>
<p dir="auto">(!cy should be the same as 1-cy here. I would hope either variant can be compiled without a conditional branch).</p>
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