* canlock.el (canlock-version): Remove.

* canlock.el (canlock-version): Remove.
(canlock-sha1-with-openssl): Don't use `canlock-string-as-unibyte' here;
 simplify \x insertions.
(canlock-sha1): New function, always return a unibyte string.
(canlock-make-cancel-key): Use `canlock-sha1';
 simplify truncation of a password.
(canlock-insert-header): Use `canlock-sha1'.
(canlock-verify): Ditto.