Openwall's John the Ripper (JtR) is a fast password cracker,
currently available for many flavors of Unix and for Windows. Its primary
purpose is to detect weak Unix passwords. Besides several crypt(3) password hash
types most commonly found on various Unix systems, supported out of the box are
Windows LM hashes, various macOS password hashes, as well as many
non-hashes such as SSH private keys, encrypted filesystems such as macOS .dmg files
and "sparse bundles", encrypted archives such as ZIP, RAR, and 7z,
encrypted document files such as PDF and Microsoft Office's, plus lots of
other hashes and ciphers.