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, 0 insertions, 183 deletions

diff --git a/crypt/crypt-entry.c b/crypt/crypt-entry.c
deleted file mode 100644
index c24c011..0000000
--- a/crypt/crypt-entry.c
+++ /dev/null
@@ -1,183 +0,0 @@
-/*
- * UFC-crypt: ultra fast crypt(3) implementation
- *
- * Copyright (C) 1991-2023 Free Software Foundation, Inc.
- *
- * The GNU C Library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * The GNU C Library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with the GNU C Library; if not, see
- * <https://www.gnu.org/licenses/>.
- *
- * crypt entry points
- *
- * @(#)crypt-entry.c	1.2 12/20/96
- *
- */
-
-#ifdef DEBUG
-#include <stdio.h>
-#endif
-#include <string.h>
-#include <errno.h>
-#include <fips-private.h>
-
-#ifndef STATIC
-#define STATIC static
-#endif
-
-#include "crypt-private.h"
-#include <shlib-compat.h>
-
-/* Prototypes for local functions.  */
-#ifndef __GNU_LIBRARY__
-void _ufc_clearmem (char *start, int cnt);
-#else
-#define _ufc_clearmem(start, cnt)   memset(start, 0, cnt)
-#endif
-extern char *__md5_crypt_r (const char *key, const char *salt, char *buffer,
-			    int buflen);
-extern char *__md5_crypt (const char *key, const char *salt);
-extern char *__sha256_crypt_r (const char *key, const char *salt,
-			       char *buffer, int buflen);
-extern char *__sha256_crypt (const char *key, const char *salt);
-extern char *__sha512_crypt_r (const char *key, const char *salt,
-			       char *buffer, int buflen);
-extern char *__sha512_crypt (const char *key, const char *salt);
-
-/* Define our magic string to mark salt for MD5 encryption
-   replacement.  This is meant to be the same as for other MD5 based
-   encryption implementations.  */
-static const char md5_salt_prefix[] = "$1$";
-
-/* Magic string for SHA256 encryption.  */
-static const char sha256_salt_prefix[] = "$5$";
-
-/* Magic string for SHA512 encryption.  */
-static const char sha512_salt_prefix[] = "$6$";
-
-/* For use by the old, non-reentrant routines (crypt/encrypt/setkey)  */
-extern struct crypt_data _ufc_foobar;
-
-/*
- * UNIX crypt function
- */
-
-char *
-__crypt_r (const char *key, const char *salt,
-	   struct crypt_data * __restrict data)
-{
-  ufc_long res[4];
-  char ktab[9];
-  ufc_long xx = 25; /* to cope with GCC long long compiler bugs */
-
-#ifdef _LIBC
-  /* Try to find out whether we have to use MD5 encryption replacement.  */
-  if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0)
-    {
-      /* FIPS rules out MD5 password encryption.  */
-      if (fips_enabled_p ())
-	{
-	  __set_errno (EPERM);
-	  return NULL;
-	}
-      return __md5_crypt_r (key, salt, (char *) data,
-			    sizeof (struct crypt_data));
-    }
-
-  /* Try to find out whether we have to use SHA256 encryption replacement.  */
-  if (strncmp (sha256_salt_prefix, salt, sizeof (sha256_salt_prefix) - 1) == 0)
-    return __sha256_crypt_r (key, salt, (char *) data,
-			     sizeof (struct crypt_data));
-
-  /* Try to find out whether we have to use SHA512 encryption replacement.  */
-  if (strncmp (sha512_salt_prefix, salt, sizeof (sha512_salt_prefix) - 1) == 0)
-    return __sha512_crypt_r (key, salt, (char *) data,
-			     sizeof (struct crypt_data));
-#endif
-
-  /*
-   * Hack DES tables according to salt
-   */
-  if (!_ufc_setup_salt_r (salt, data))
-    {
-      __set_errno (EINVAL);
-      return NULL;
-    }
-
-  /* FIPS rules out DES password encryption.  */
-  if (fips_enabled_p ())
-    {
-      __set_errno (EPERM);
-      return NULL;
-    }
-
-  /*
-   * Setup key schedule
-   */
-  _ufc_clearmem (ktab, (int) sizeof (ktab));
-  (void) strncpy (ktab, key, 8);
-  _ufc_mk_keytab_r (ktab, data);
-
-  /*
-   * Go for the 25 DES encryptions
-   */
-  _ufc_clearmem ((char*) res, (int) sizeof (res));
-  _ufc_doit_r (xx,  data, &res[0]);
-
-  /*
-   * Do final permutations
-   */
-  _ufc_dofinalperm_r (res, data);
-
-  /*
-   * And convert back to 6 bit ASCII
-   */
-  _ufc_output_conversion_r (res[0], res[1], salt, data);
-
-  /*
-   * Erase key-dependent intermediate data.  Data dependent only on
-   * the salt is not considered sensitive.
-   */
-  explicit_bzero (ktab, sizeof (ktab));
-  explicit_bzero (data->keysched, sizeof (data->keysched));
-  explicit_bzero (res, sizeof (res));
-
-  return data->crypt_3_buf;
-}
-weak_alias (__crypt_r, crypt_r)
-
-char *
-crypt (const char *key, const char *salt)
-{
-#ifdef _LIBC
-  /* Try to find out whether we have to use MD5 encryption replacement.  */
-  if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0
-      /* Let __crypt_r deal with the error code if FIPS is enabled.  */
-      && !fips_enabled_p ())
-    return __md5_crypt (key, salt);
-
-  /* Try to find out whether we have to use SHA256 encryption replacement.  */
-  if (strncmp (sha256_salt_prefix, salt, sizeof (sha256_salt_prefix) - 1) == 0)
-    return __sha256_crypt (key, salt);
-
-  /* Try to find out whether we have to use SHA512 encryption replacement.  */
-  if (strncmp (sha512_salt_prefix, salt, sizeof (sha512_salt_prefix) - 1) == 0)
-    return __sha512_crypt (key, salt);
-#endif
-
-  return __crypt_r (key, salt, &_ufc_foobar);
-}
-
-#if SHLIB_COMPAT (libcrypt, GLIBC_2_0, GLIBC_2_28)
-weak_alias (crypt, fcrypt)
-compat_symbol (libcrypt, fcrypt, fcrypt, GLIBC_2_0);
-#endif