commit 346177255931fb1e3514e124a1f598715a5fe92d
author Paul Bakker <p.j.bakker@polarssl.org> Fri Jun 13 17:20:13 2014 +0200
committer Paul Bakker <p.j.bakker@polarssl.org> Sat Jun 14 16:46:03 2014 +0200
tree da658994944be861b8b2a1001c9b759976276891
parent bbcb1ce7030575d708700ca205800e847d846402

Introduce polarssl_zeroize() instead of memset() for zeroization

library/ecp.c

diff --git a/library/ecp.c b/library/ecp.c
index ca0ce7e..0c9c483 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -77,6 +77,11 @@
 #endif /* __ARMCC_VERSION */
 #endif /*_MSC_VER */
 
+/* Implementation that should never be optimized out by the compiler */
+static void polarssl_zeroize( void *v, size_t n ) {
+    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
+}
+
 #if defined(POLARSSL_SELF_TEST)
 /*
  * Counts of point addition and doubling, and field multiplications.
@@ -344,7 +349,7 @@
         polarssl_free( grp->T );
     }
 
-    memset( grp, 0, sizeof( ecp_group ) );
+    polarssl_zeroize( grp, sizeof( ecp_group ) );
 }
 
 /*