Add _init() and _free() for cipher modules
diff --git a/library/blowfish.c b/library/blowfish.c
index d8b0c36..87396dc 100644
--- a/library/blowfish.c
+++ b/library/blowfish.c
@@ -41,6 +41,11 @@
#if !defined(POLARSSL_BLOWFISH_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 (big endian)
*/
@@ -152,6 +157,19 @@
*xr = Xr;
}
+void blowfish_init( blowfish_context *ctx )
+{
+ memset( ctx, 0, sizeof( blowfish_context ) );
+}
+
+void blowfish_free( blowfish_context *ctx )
+{
+ if( ctx == NULL )
+ return;
+
+ polarssl_zeroize( ctx, sizeof( blowfish_context ) );
+}
+
/*
* Blowfish key schedule
*/
