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, 98 deletions

diff --git a/crypt/sha256-block.c b/crypt/sha256-block.c
deleted file mode 100644
index a44fe01d5b..0000000000
--- a/crypt/sha256-block.c
+++ /dev/null
@@ -1,98 +0,0 @@
-#include <stdint.h>
-
-/* Process LEN bytes of BUFFER, accumulating context into CTX.
-   It is assumed that LEN % 64 == 0.  */
-void
-__sha256_process_block (const void *buffer, size_t len, struct sha256_ctx *ctx)
-{
-  const uint32_t *words = buffer;
-  size_t nwords = len / sizeof (uint32_t);
-  uint32_t a = ctx->H[0];
-  uint32_t b = ctx->H[1];
-  uint32_t c = ctx->H[2];
-  uint32_t d = ctx->H[3];
-  uint32_t e = ctx->H[4];
-  uint32_t f = ctx->H[5];
-  uint32_t g = ctx->H[6];
-  uint32_t h = ctx->H[7];
-
-  /* First increment the byte count.  FIPS 180-2 specifies the possible
-     length of the file up to 2^64 bits.  Here we only compute the
-     number of bytes.  */
-  ctx->total64 += len;
-
-  /* Process all bytes in the buffer with 64 bytes in each round of
-     the loop.  */
-  while (nwords > 0)
-    {
-      uint32_t W[64];
-      uint32_t a_save = a;
-      uint32_t b_save = b;
-      uint32_t c_save = c;
-      uint32_t d_save = d;
-      uint32_t e_save = e;
-      uint32_t f_save = f;
-      uint32_t g_save = g;
-      uint32_t h_save = h;
-
-      /* Operators defined in FIPS 180-2:4.1.2.  */
-#define Ch(x, y, z) ((x & y) ^ (~x & z))
-#define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
-#define S0(x) (CYCLIC (x, 2) ^ CYCLIC (x, 13) ^ CYCLIC (x, 22))
-#define S1(x) (CYCLIC (x, 6) ^ CYCLIC (x, 11) ^ CYCLIC (x, 25))
-#define R0(x) (CYCLIC (x, 7) ^ CYCLIC (x, 18) ^ (x >> 3))
-#define R1(x) (CYCLIC (x, 17) ^ CYCLIC (x, 19) ^ (x >> 10))
-
-      /* It is unfortunate that C does not provide an operator for
-	 cyclic rotation.  Hope the C compiler is smart enough.  */
-#define CYCLIC(w, s) ((w >> s) | (w << (32 - s)))
-
-      /* Compute the message schedule according to FIPS 180-2:6.2.2 step 2.  */
-      for (unsigned int t = 0; t < 16; ++t)
-	{
-	  W[t] = SWAP (*words);
-	  ++words;
-	}
-      for (unsigned int t = 16; t < 64; ++t)
-	W[t] = R1 (W[t - 2]) + W[t - 7] + R0 (W[t - 15]) + W[t - 16];
-
-      /* The actual computation according to FIPS 180-2:6.2.2 step 3.  */
-      for (unsigned int t = 0; t < 64; ++t)
-	{
-	  uint32_t T1 = h + S1 (e) + Ch (e, f, g) + K[t] + W[t];
-	  uint32_t T2 = S0 (a) + Maj (a, b, c);
-	  h = g;
-	  g = f;
-	  f = e;
-	  e = d + T1;
-	  d = c;
-	  c = b;
-	  b = a;
-	  a = T1 + T2;
-	}
-
-      /* Add the starting values of the context according to FIPS 180-2:6.2.2
-	 step 4.  */
-      a += a_save;
-      b += b_save;
-      c += c_save;
-      d += d_save;
-      e += e_save;
-      f += f_save;
-      g += g_save;
-      h += h_save;
-
-      /* Prepare for the next round.  */
-      nwords -= 16;
-    }
-
-  /* Put checksum in context given as argument.  */
-  ctx->H[0] = a;
-  ctx->H[1] = b;
-  ctx->H[2] = c;
-  ctx->H[3] = d;
-  ctx->H[4] = e;
-  ctx->H[5] = f;
-  ctx->H[6] = g;
-  ctx->H[7] = h;
-}