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diff --git a/ecc-internal.h b/ecc-internal.h
index 9e24e0ce..2cc9b137 100644
--- a/ecc-internal.h
+++ b/ecc-internal.h
@@ -49,6 +49,7 @@
#define ecc_mod_submul_1 _nettle_ecc_mod_submul_1
#define ecc_mod_mul _nettle_ecc_mod_mul
#define ecc_mod_sqr _nettle_ecc_mod_sqr
+#define ecc_mod_mul_canonical _nettle_ecc_mod_mul_canonical
#define ecc_mod_random _nettle_ecc_mod_random
#define ecc_mod _nettle_ecc_mod
#define ecc_mod_inv _nettle_ecc_mod_inv
@@ -256,6 +257,13 @@ void
ecc_mod_sqr (const struct ecc_modulo *m, mp_limb_t *rp,
const mp_limb_t *ap);
+/* mul function produces a canonical result, 0 <= R < M, needs 2*m->size limbs
+ * at 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);
+
/* mod q operations. */
void
ecc_mod_random (const struct ecc_modulo *m, mp_limb_t *xp,
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