The C reference implementation is here: http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/crypt/ http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/crypt/ It

The C reference implementation is here: http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/crypt/ http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/crypt/ Its from OpenBSD and implemented by the developers of the algorithm. It is what the Python/Ruby/Lisp/PHP etc. versions are derived from or wrap