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diff --git a/gostdsa-vko.c b/gostdsa-vko.c
index 7bdcdfc3..c6697ab3 100644
--- a/gostdsa-vko.c
+++ b/gostdsa-vko.c
@@ -87,7 +87,8 @@ gostdsa_vko (const struct ecc_scalar *priv,
if (mpn_zero_p (UKM, size))
UKM[0] = 1;
- ecc_mod_mul (&ecc->q, TEMP, priv->p, UKM); /* TEMP = UKM * priv */
+ ecc_mod_mul_canonical (&ecc->q, TEMP, priv->p, UKM); /* TEMP = UKM * priv */
+
ecc->mul (ecc, XYZ, TEMP, pub->p, scratch + 4*size); /* XYZ = UKM * priv * pub */
ecc->h_to_a (ecc, 0, TEMP, XYZ, scratch + 5*size); /* TEMP = XYZ */
mpn_get_base256_le (out, bsize, TEMP, size);
--
2.31.1
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