crypt: Remove libcrypt support

All the crypt related functions, cryptographic algorithms, and
make requirements are removed,  with only the exception of md5
implementation which is moved to locale folder since it is
required by localedef for integrity protection (libc's
locale-reading code does not check these, but localedef does
generate them).

Besides thec code itself, both internal documentation and the
manual is also adjusted.  This allows to remove both --enable-crypt
and --enable-nss-crypt configure options.

Checked with a build for all affected ABIs.

Co-authored-by: Zack Weinberg <zack@owlfolio.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 9432564444..4580fe381d 100644
--- a/NEWS
+++ b/NEWS
@@ -44,6 +44,22 @@ Deprecated and removed features, and other changes affecting compatibility:
   ".tmp", to avoid examining temporary files created by the RPM and dpkg
   package managers.
 
+* libcrypt has been removed from the GNU C Library.  The configure
+  options "--enable-crypt" and "--enable-nss-crypt" are no longer
+  available.  <crypt.h>, libcrypt.a, and libcrypt.so.1 will not be
+  installed, and <unistd.h> will not declare the crypt function.
+
+  The replacement for libcrypt is libxcrypt, maintained separately from
+  GNU libc, but available under compatible licensing terms, and providing
+  binary backward compatibility with the former libcrypt.  It is currently
+  distributed from <https://github.com/besser82/libxcrypt/>.
+
+  As a consequence of this removal, GNU libc no longer makes any use of
+  the NSS cryptography library (Network Security Services; not to be
+  confused with Name Service Switch).  Distributors of binary packages
+  of GNU libc are advised to check whether their build processes can be
+  simplified.
+
 Changes to build and runtime requirements:
 
 * Building on LoongArch requires at a minimum binutils 2.41 for vector