From: Niels Möller <nisse@lysator.liu.se>
Date: Wed, 27 Feb 2013 15:20:42 +0000 (+0100)
Subject: Fixed 32-bit ecc_192_modp.
X-Git-Tag: nettle_2.7_release_20130424~109^2~20
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c36a8dee0b8d37813377a9b35b800fe027c0287b;p=thirdparty%2Fnettle.git

Fixed 32-bit ecc_192_modp.
---

diff --git a/ChangeLog b/ChangeLog
index 7f6d4f1e..f11ea02e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,7 @@
 
 	* ecc-192.c: Check HAVE_NATIVE_ecc_192_modp, and use native
 	version if available.
+	(ecc_192_modp): Fixed carry handling bug in 32-bit version.
 
 	* x86_64/ecc-192-modp.asm: New file.
 
diff --git a/ecc-192.c b/ecc-192.c
index 9e785dc1..23015e4a 100644
--- a/ecc-192.c
+++ b/ecc-192.c
@@ -66,7 +66,7 @@ ecc_192_modp (const struct ecc_curve *ecc UNUSED, mp_limb_t *rp)
   cy = sec_add_1 (rp + 5, rp + 5, 1, cy);
   
   assert (cy <= 1);
-  cy = cnd_add_n (cy, rp, ecc_Bmodp, 3);
+  cy = cnd_add_n (cy, rp, ecc_Bmodp, 6);
   assert (cy == 0);  
 }
 #elif GMP_NUMB_BITS == 64