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diff --git a/ecc-mod-arith.c b/ecc-mod-arith.c
index f2e47f67..959eae1c 100644
--- 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 cy;
+ ecc_mod_mul(m, rp, ap, bp);
+
+ cy = mpn_sub_n (rp + m->size, rp, m->m, m->size);
+ cnd_copy (!cy, rp, rp + m->size, m->size);
+}
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