From: Niels Möller <nisse@lysator.liu.se>
Date: Thu, 4 Apr 2013 14:28:40 +0000 (+0200)
Subject: ecc_point_get: Allow NULL x or y.
X-Git-Tag: nettle_2.7_release_20130424~67
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2dfae9f33daefc7c1fcb39cf50420a087cd45d5c;p=thirdparty%2Fnettle.git

ecc_point_get: Allow NULL x or y.
---

diff --git a/ChangeLog b/ChangeLog
index d3ca0def..ad89c2ec 100644
--- 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 4d3489c4..82645a79 100644
--- 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);
 }