1 files changed, 25 insertions, 0 deletions
diff --git a/extra/libkeccak_state_copy.c b/extra/libkeccak_state_copy.c
new file mode 100644
index 0000000..950fc91
--- /dev/null
+++ b/extra/libkeccak_state_copy.c
@@ -0,0 +1,25 @@
+/* See LICENSE file for copyright and license details. */
+#include "../common.h"
+
+
+/**
+ * Make a copy of a state
+ * 
+ * @param   dest  The slot for the duplicate, must not be initialised (memory leak otherwise)
+ * @param   src   The state to duplicate
+ * @return        Zero on success, -1 on error
+ */
+int
+libkeccak_state_copy(struct libkeccak_state *restrict dest, const struct libkeccak_state *restrict src)
+{
+	*dest = *src;
+	if (src->mlen) {
+		dest->M = malloc(src->mlen * sizeof(char));
+		if (!dest->M)
+			return -1;
+		memcpy(dest->M, src->M, src->mptr * sizeof(char));
+	} else {
+		dest->M = NULL;
+	}
+	return 0;
+}