Remove all "#if 0" blocks from header files.
Reviewed-by: NTim Hudson <tjh@openssl.org>

A DES algorithm mode, known attacks, no EVP support.
Flushed.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

Reviewed-by: NTim Hudson <tjh@openssl.org>

indent will not alter them when reformatting comments
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>

This commit removes all mention of NeXT and NextStep.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

PR: 1125

DES_LONG and OPENSSL_NO_DESCBCM.

were defined.

(before SSLeay, maybe?), it's better to have that macro protect
the compatibility header des_old.h.  In the new des.h, let's use
a slightly different protecting macro.

The rationale is that there are application that might include (via
other header files, perhaps) both an old libdes des.h and OpenSSL's
des.h.  Whichever comes first would overshadow the other because of
the clash in protecting macro.  This fix solves that problem.

when backward compatibility is desired).

Make sure DES_cblock is defined at all times (meaning one shouldn't include
openssl/des_old.h directly any more).

OPENSSL_DES_PRE_0_9_7_COMPATIBILITY is defined.  NOT AT ALL TESTED YET!
Add a comment as to the libdes compatibility.

functions in ui_compat.  This gave reason to rework that part more
thoroughly, so here are the changes made:

1. Add DES_read_password() and DES_read_2passwords() with the same
   functionality as the corresponding old des_ functions, as a
   convenience to the users.
2. Add UI_UTIL_read_pw_string() and UI_UTIL_read_pw() with the
   functionality from des_read_pw_string() and des_read_pw(), again as
   a concenience to the users.
3. Rename des_read_password(), des_read_2passwords(),
   des_read_pw_string() and des_read_pw() by changing des_ to
   _ossl_old_des_, and add the usual mapping macros.
4. Move the implementation of des_read_password() and
   des_read_2passwords() to the des directory, since they are tightly
   tied to DES anyway.

This change was inspired by a patch from Assar Westerlund <assar@sics.se>:

There are some functions that didn't get the kick-away-old-des-and-
replace-des-with-DES action.  Here's a patch that adds DES_ and des_
(in des_old.h) versions of des_read_pw_string et al.  This patch
includes some of the first des_old.h semi-colon macro fixes that I've
already sent.

This patch makes the macros in des_old.h actually pretend to be
functions.

There's no reason not to define _ossl_old_crypt when using
PERL5/FreeBSD/darwin/Next, since it makes using crypt and including
des.h break.  Here's a trivial patch.

This patch fixes some of the typos used in macro names in des_old.h
and the number of arguments for some of them.

OpenSSL.  Adding '_ossl' in the name seems to be a good way to do
this.

functions to _old_des_*.

avoid clashes with other code that have their own DES_ functions but
really only use OpenSSL's old des_ functions.

libdes (which is still used out there) or other des implementations,
the OpenSSL DES functions are renamed to begin with DES_ instead of
des_.  Compatibility routines are provided and declared by including
openssl/des_old.h.  Those declarations are the same as were in des.h
when the OpenSSL project started, which is exactly how libdes looked
at that time, and hopefully still looks today.

The compatibility functions will be removed in some future release, at
the latest in version 1.0.