Fixed 32-bit ecc_192_modp.

c36a8dee · Niels Möller · a3888205 · c36a8dee · c36a8dee
Commit c36a8dee authored Feb 27, 2013 by Niels Möller
--- 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.


--- 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