Perl-only implementation of the crypt(3) function

 The Crypt::UnixCrypt module is a portable implementation of the Unix
 library function crypt(). It is especially useful on systems whose
 perl does not implement the built-in crypt() function.
 .
 This module won't overload a built-in crypt() unless forced by a true
 value of the variable $Crypt::UnixCrypt::OVERRIDE_BUILTIN.