Known Host Cracker (khc) is a small tool designed to recover hashed known_host files back to their plain-text equivalents.
You can download it from the following link: https://packetstormsecurity.com/files/download/87003/khc_0.2.tar.gz
Source: https://packetstormsecurity.com/files/87003/Known-Host-Cracker-0.2.html