ecc_point_get: Allow NULL x or y.

diff --git a/ChangeLog b/ChangeLog
index d3ca0def273a9e76b221251c36c6a5f9b8c52227..ad89c2ec51dfa0dfa4040a1afc3691053a8966fc 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2013-04-04  Niels Möller  <nisse@lysator.liu.se>
 
+       * ecc-point.c (ecc_point_get): Allow NULL x or y, ignore
+       corresponding coordinate.
+
        * nettle.texinfo (Elliptic curves): Document high-level ECDSA
        support.
 

diff --git a/ecc-point.c b/ecc-point.c
index 4d3489c472c9a26ba1d29998c756940605837f58..82645a79df350b035fd154e506fbde8bf44c8478 100644 (file)
--- a/ecc-point.c
+++ b/ecc-point.c
@@ -84,6 +84,8 @@ void
 ecc_point_get (const struct ecc_point *p, mpz_t x, mpz_t y)
 {
   mp_size_t size = p->ecc->size;
-  mpz_set_n (x, p->p, size);
-  mpz_set_n (y, p->p + size, size);
+  if (x)
+    mpz_set_n (x, p->p, size);
+  if (y)
+    mpz_set_n (y, p->p + size, size);
 }