Comment by JdeBP

Not really. For Linux-based operatings systems, the GNU libc manual cryptography section is a shadow of its former self. It has no crypt() function to accompany it any more, and has not had since 2023.

* https://sourceware.org/git/?p=glibc.git;a=commit;h=e6e3c6668...

Notice that Debian didn't list your manual page, which doesn't accompany a crypt() function at all, since it isn't actually the GNU libc manual but a separate independent manual for Linux. The GNU libc manual nowadays acknowledges Michael Glad's work but no longer documents crypt(). It used to, and it used to explain some of the 'impossible' encrypted string values:

* https://sourceware.org/glibc/manual/2.38/html_node/Passphras...

You noticed that I'd not got the GNU libc manual. Neither had you. (-: