SHA-512 Crypt Password Hash
Generate a $6$ SHA-512 crypt password hash for /etc/shadow, cloud-init, Ansible or usermod, with a random salt and optional rounds.
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Input
Generate a SHA-512 crypt password hash ($6$)
Output
Hashing...
The crypt(3) format /etc/shadow, cloud-init's passwd and Ansible's password_hash('sha512') use; the same as openssl passwd -6 -salt saltstring. Debian 11+ and Ubuntu 22.04+ default to yescrypt ($y$) for new passwords but still accept $6$. For a login password prefer an SSH key; for a hash in user data, use a random salt, never the example.
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About this tool
Method, assumptions, practical next steps, and limits.
Where $6$ hashes are used
/etc/shadow on Linux, the passwd field of cloud-init users, Ansible's user module with password_hash('sha512'), Kickstart and preseed files. The result matches openssl passwd -6 -salt saltstring and mkpasswd -m sha-512. The algorithm is specified in Ulrich Drepper's Unix crypt using SHA-256 and SHA-512.
Newer systems use yescrypt
Debian 11 and later and Ubuntu 22.04 and later hash new passwords with yescrypt ($y$), which is memory-hard. They still verify $6$ hashes, so a $6$ hash in user data works. For server logins, SSH keys are better than any password.
