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>

2 files changed, 0 insertions, 126 deletions

diff --git a/manual/examples/genpass.c b/manual/examples/genpass.c
deleted file mode 100644
index e40efc782b..0000000000
--- a/manual/examples/genpass.c
+++ /dev/null
@@ -1,59 +0,0 @@
-/* Encrypting Passwords
-   Copyright (C) 1991-2023 Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or
-   modify it under the terms of the GNU General Public License
-   as published by the Free Software Foundation; either version 2
-   of the License, or (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.
-*/
-
-#include <stdio.h>
-#include <unistd.h>
-#include <crypt.h>
-
-int
-main(void)
-{
-  unsigned char ubytes[16];
-  char salt[20];
-  const char *const saltchars =
-    "./0123456789ABCDEFGHIJKLMNOPQRST"
-    "UVWXYZabcdefghijklmnopqrstuvwxyz";
-  char *hash;
-  int i;
-
-  /* Retrieve 16 unpredictable bytes from the operating system.  */
-  if (getentropy (ubytes, sizeof ubytes))
-    {
-      perror ("getentropy");
-      return 1;
-    }
-
-  /* Use them to fill in the salt string.  */
-  salt[0] = '$';
-  salt[1] = '5'; /* SHA-256 */
-  salt[2] = '$';
-  for (i = 0; i < 16; i++)
-    salt[3+i] = saltchars[ubytes[i] & 0x3f];
-  salt[3+i] = '\0';
-
-  /* Read in the user's passphrase and hash it.  */
-  hash = crypt (getpass ("Enter new passphrase: "), salt);
-  if (!hash || hash[0] == '*')
-    {
-      perror ("crypt");
-      return 1;
-    }
-
-  /* Print the results.  */
-  puts (hash);
-  return 0;
-}
diff --git a/manual/examples/testpass.c b/manual/examples/testpass.c
deleted file mode 100644
index 555fe115c4..0000000000
--- a/manual/examples/testpass.c
+++ /dev/null
@@ -1,67 +0,0 @@
-/* Verify a passphrase.
-   Copyright (C) 1991-2023 Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or
-   modify it under the terms of the GNU General Public License
-   as published by the Free Software Foundation; either version 2
-   of the License, or (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.
-*/
-
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <crypt.h>
-
-/* @samp{GNU's Not Unix} hashed using SHA-256, MD5, and DES.  */
-static const char hash_sha[] =
-  "$5$DQ2z5NHf1jNJnChB$kV3ZTR0aUaosujPhLzR84Llo3BsspNSe4/tsp7VoEn6";
-static const char hash_md5[] = "$1$A3TxDv41$rtXVTUXl2LkeSV0UU5xxs1";
-static const char hash_des[] = "FgkTuF98w5DaI";
-
-int
-main(void)
-{
-  char *phrase;
-  int status = 0;
-
-  /* Prompt for a passphrase.  */
-  phrase = getpass ("Enter passphrase: ");
-
-  /* Compare against the stored hashes.  Any input that begins with
-     @samp{GNU's No} will match the DES hash, but the other two will
-     only match @samp{GNU's Not Unix}.  */
-
-  if (strcmp (crypt (phrase, hash_sha), hash_sha))
-    {
-      puts ("SHA: not ok");
-      status = 1;
-    }
-  else
-    puts ("SHA: ok");
-
-  if (strcmp (crypt (phrase, hash_md5), hash_md5))
-    {
-      puts ("MD5: not ok");
-      status = 1;
-    }
-  else
-    puts ("MD5: ok");
-
-  if (strcmp (crypt (phrase, hash_des), hash_des))
-    {
-      puts ("DES: not ok");
-      status = 1;
-    }
-  else
-    puts ("DES: ok");
-
-  return status;
-}