commit 312da33ef121dcbaad3dee049f7b34243aead792
author Paul Bakker <p.j.bakker@polarssl.org> Fri Jun 13 17:20:13 2014 +0200
committer Paul Bakker <p.j.bakker@polarssl.org> Tue Jul 08 18:28:52 2014 +0200
tree 5b864d1aaca37ffff03d3e46ef10557b701ed8cf
parent 1b08bd9525e9c880dd05873831b38844d0d8c8d6

Introduce polarssl_zeroize() instead of memset() for zeroization

library/aes.c

diff --git a/library/aes.c b/library/aes.c
index 6456c54..8b67cbb 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -40,6 +40,11 @@
 
 #if !defined(POLARSSL_AES_ALT)
 
+/* 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;
+}
+
 /*
  * 32-bit integer manipulation macros (little endian)
  */
@@ -611,7 +616,7 @@
     *RK++ = *SK++;
     *RK++ = *SK++;
 
-    memset( &cty, 0, sizeof( aes_context ) );
+    polarssl_zeroize( &cty, sizeof( aes_context ) );
 
     return( 0 );
 }