2 files changed, 18 insertions, 0 deletions
diff --git a/C/HF/chap8/include/libs/encrypt.h b/C/HF/chap8/include/libs/encrypt.h
new file mode 100644
index 0000000..e70d8f6
--- /dev/null
+++ b/C/HF/chap8/include/libs/encrypt.h
@@ -0,0 +1,10 @@
+#ifndef ENCRYPT_H
+#define ENCRYPT_H
+
+typedef void (*encrypt_fn_t)(char *message);
+typedef void (*encrypt_arr_t[])(char *message);
+
+void encrypt(char *message, encrypt_fn_t);
+void encrypt_arr(char *message, encrypt_arr_t fn_arr, int size);
+
+#endif /* ENCRYPT_H */
diff --git a/C/HF/chap8/include/libs/xor.h b/C/HF/chap8/include/libs/xor.h
new file mode 100644
index 0000000..8dd8e17
--- /dev/null
+++ b/C/HF/chap8/include/libs/xor.h
@@ -0,0 +1,8 @@
+#ifndef XOR_H
+#define XOR_H
+
+void xor16(char *m);
+void xor42(char *m);
+void xor64(char *m);
+
+#endif