Copyright (C) 2005 Maurice Massar
Thanks to [email protected] for decoding and posting the algorithm!

Requires libgcrypt version 1.1.90 or newer

Compile with:
gcc -Wall -o cisco-decrypt cisco-decrypt.c $(libgcrypt-config --libs --cflags)

Usage:
./cisco-decrypt DEADBEEF...012345678 424242...7261