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, 193 deletions

diff --git a/crypt/sha256.c b/crypt/sha256.c
deleted file mode 100644
index 96153d67dc..0000000000
--- a/crypt/sha256.c
+++ /dev/null
@@ -1,193 +0,0 @@
-/* Functions to compute SHA256 message digest of files or memory blocks.
-   according to the definition of SHA256 in FIPS 180-2.
-   Copyright (C) 2007-2023 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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/>.  */
-
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include <endian.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdint.h>
-#include <sys/types.h>
-
-#include "sha256.h"
-
-#if __BYTE_ORDER == __LITTLE_ENDIAN
-# ifdef _LIBC
-#  include <byteswap.h>
-#  define SWAP(n) bswap_32 (n)
-#  define SWAP64(n) bswap_64 (n)
-# else
-#  define SWAP(n) \
-    (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
-#  define SWAP64(n) \
-  (((n) << 56)					\
-   | (((n) & 0xff00) << 40)			\
-   | (((n) & 0xff0000) << 24)			\
-   | (((n) & 0xff000000) << 8)			\
-   | (((n) >> 8) & 0xff000000)			\
-   | (((n) >> 24) & 0xff0000)			\
-   | (((n) >> 40) & 0xff00)			\
-   | ((n) >> 56))
-# endif
-#else
-# define SWAP(n) (n)
-# define SWAP64(n) (n)
-#endif
-
-
-/* This array contains the bytes used to pad the buffer to the next
-   64-byte boundary.  (FIPS 180-2:5.1.1)  */
-static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ...  */ };
-
-
-/* Constants for SHA256 from FIPS 180-2:4.2.2.  */
-static const uint32_t K[64] =
-  {
-    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
-    0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
-    0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
-    0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
-    0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
-    0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
-    0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
-    0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
-    0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
-    0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
-    0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
-    0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
-    0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
-    0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
-    0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
-    0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
-  };
-
-void __sha256_process_block (const void *, size_t, struct sha256_ctx *);
-
-/* Initialize structure containing state of computation.
-   (FIPS 180-2:5.3.2)  */
-void
-__sha256_init_ctx (struct sha256_ctx *ctx)
-{
-  ctx->H[0] = 0x6a09e667;
-  ctx->H[1] = 0xbb67ae85;
-  ctx->H[2] = 0x3c6ef372;
-  ctx->H[3] = 0xa54ff53a;
-  ctx->H[4] = 0x510e527f;
-  ctx->H[5] = 0x9b05688c;
-  ctx->H[6] = 0x1f83d9ab;
-  ctx->H[7] = 0x5be0cd19;
-
-  ctx->total64 = 0;
-  ctx->buflen = 0;
-}
-
-
-/* Process the remaining bytes in the internal buffer and the usual
-   prolog according to the standard and write the result to RESBUF.
-
-   IMPORTANT: On some systems it is required that RESBUF is correctly
-   aligned for a 32 bits value.  */
-void *
-__sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf)
-{
-  /* Take yet unprocessed bytes into account.  */
-  uint32_t bytes = ctx->buflen;
-  size_t pad;
-
-  /* Now count remaining bytes.  */
-  ctx->total64 += bytes;
-
-  pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
-  memcpy (&ctx->buffer[bytes], fillbuf, pad);
-
-  /* Put the 64-bit file length in *bits* at the end of the buffer.  */
-  ctx->buffer32[(bytes + pad + 4) / 4] = SWAP (ctx->total[TOTAL64_low] << 3);
-  ctx->buffer32[(bytes + pad) / 4] = SWAP ((ctx->total[TOTAL64_high] << 3)
-					   | (ctx->total[TOTAL64_low] >> 29));
-
-  /* Process last bytes.  */
-  __sha256_process_block (ctx->buffer, bytes + pad + 8, ctx);
-
-  /* Put result from CTX in first 32 bytes following RESBUF.  */
-  for (unsigned int i = 0; i < 8; ++i)
-    ((uint32_t *) resbuf)[i] = SWAP (ctx->H[i]);
-
-  return resbuf;
-}
-
-
-void
-__sha256_process_bytes (const void *buffer, size_t len, struct sha256_ctx *ctx)
-{
-  /* When we already have some bits in our internal buffer concatenate
-     both inputs first.  */
-  if (ctx->buflen != 0)
-    {
-      size_t left_over = ctx->buflen;
-      size_t add = 128 - left_over > len ? len : 128 - left_over;
-
-      memcpy (&ctx->buffer[left_over], buffer, add);
-      ctx->buflen += add;
-
-      if (ctx->buflen > 64)
-	{
-	  __sha256_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
-
-	  ctx->buflen &= 63;
-	  /* The regions in the following copy operation cannot overlap.  */
-	  memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63],
-		  ctx->buflen);
-	}
-
-      buffer = (const char *) buffer + add;
-      len -= add;
-    }
-
-  /* Process available complete blocks.  */
-  if (len >= 64)
-    {
-      while (len > 64)
-	{
-	  __sha256_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
-	  buffer = (const char *) buffer + 64;
-	  len -= 64;
-	}
-    }
-
-  /* Move remaining bytes into internal buffer.  */
-  if (len > 0)
-    {
-      size_t left_over = ctx->buflen;
-
-      memcpy (&ctx->buffer[left_over], buffer, len);
-      left_over += len;
-      if (left_over >= 64)
-	{
-	  __sha256_process_block (ctx->buffer, 64, ctx);
-	  left_over -= 64;
-	  memcpy (ctx->buffer, &ctx->buffer[64], left_over);
-	}
-      ctx->buflen = left_over;
-    }
-}
-
-#include <sha256-block.c>