Remove individual copies of mbedtls_zeroize()
This commit removes all the static occurrencies of the function
mbedtls_zeroize() in each of the individual .c modules. Instead the
function has been moved to utils.h that is included in each of the
modules.
diff --git a/library/ssl_cookie.c b/library/ssl_cookie.c
index caf1199..ec0814a 100644
--- a/library/ssl_cookie.c
+++ b/library/ssl_cookie.c
@@ -40,14 +40,10 @@
#include "mbedtls/ssl_cookie.h"
#include "mbedtls/ssl_internal.h"
+#include "mbedtls/utils.h"
#include <string.h>
-/* Implementation that should never be optimized out by the compiler */
-static void mbedtls_zeroize( void *v, size_t n ) {
- volatile unsigned char *p = v; while( n-- ) *p++ = 0;
-}
-
/*
* If DTLS is in use, then at least one of SHA-1, SHA-256, SHA-512 is
* available. Try SHA-256 first, 512 wastes resources since we need to stay