fixup! Fix: Eliminate compiler warnings during build process (#3)

Author: editheman

vfdecrypt.c

@@ -29,6 +29,11 @@
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  */
+/* 
+ * Based on: vfdecrypt (MIT, 2006) by R.-P. Weinmann, J. Appelbaum, C. Fromme.
+ * Modernization & fixes (OpenSSL 3 EVP, portability, warnings, bugfix in v2 unwrap)
+ * by Eduard Pană edipana0409@gmail.com for Malus Security, 2025.
+ */
 
 #include <stdio.h>
 #include <stdlib.h>