1 files changed, 22 insertions, 0 deletions
diff --git a/libkeccak_hmac_wipe.c b/libkeccak_hmac_wipe.c
new file mode 100644
index 0000000..fd99c48
--- /dev/null
+++ b/libkeccak_hmac_wipe.c
@@ -0,0 +1,22 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Wipe sensitive data wihout freeing any data
+ * 
+ * @param  state  The state that should be wipe
+ */
+void
+libkeccak_hmac_wipe(volatile libkeccak_hmac_state_t *restrict state)
+{
+	volatile char *restrict key_pads;
+	size_t i, size;
+	key_pads = state->key_opad;
+	size = 2 * ((state->key_length + 7) >> 3);
+	libkeccak_state_wipe(&state->sponge);
+	for (i = 0; i < size; i++)
+		key_pads[i] = 0;
+	state->leftover = 0;
+	__builtin_memset(state->buffer, 0, state->buffer_size);
+}