main/libc0.9.32: reorganize patches

We keep track of our patches in git now:
http://git.alpinelinux.org/cgit/uClibc-alpine

This is so its easier to keep track of upstream and make sure that
our patches are upstreamed.

we also bump pkgrel so we make sure we get the patches tested properly

1 files changed, 789 insertions, 0 deletions

diff --git a/main/libc0.9.32/0021-libcrypt-add-support-for-SHA256-CRYPT-password-hashi.patch b/main/libc0.9.32/0021-libcrypt-add-support-for-SHA256-CRYPT-password-hashi.patch
new file mode 100644
index 0000000000..b49e6da810
--- /dev/null
+++ b/main/libc0.9.32/0021-libcrypt-add-support-for-SHA256-CRYPT-password-hashi.patch
@@ -0,0 +1,789 @@
+From 243a437f9345fd7182bb4b2f60d892cc86794e8d Mon Sep 17 00:00:00 2001
+From: William Pitcock <nenolod@dereferenced.org>
+Date: Mon, 19 Dec 2011 01:25:09 -0600
+Subject: [PATCH] libcrypt: add support for SHA256-CRYPT password hashing
+
+This is based on Ulrich Drepper's implementation in GLIBC, but hacked up to work
+in uClibc.  The differences from the GLIBC version are as follows:
+
+- b64_from_24bit() has been converted into a macro
+- Usage of GLIBC-isms (such as libc_freeres_ptr) have been removed
+
+It is enabled by the UCLIBC_HAS_SHA256_CRYPT_IMPL configuration symbol.  You must
+have UCLIBC_HAS_CRYPT_IMPL enabled as well.
+
+Signed-off-by: William Pitcock <nenolod@dereferenced.org>
+Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
+(cherry picked from commit 3ac5fd7ecaeb6721d812c2b93e446bf9a31acdde)
+---
+ extra/Configs/Config.in |    7 +
+ libcrypt/Makefile.in    |    1 +
+ libcrypt/crypt.c        |    3 +
+ libcrypt/libcrypt.h     |    2 +
+ libcrypt/sha256-crypt.c |  326 +++++++++++++++++++++++++++++++++++++++++++++++
+ libcrypt/sha256.c       |  294 ++++++++++++++++++++++++++++++++++++++++++
+ libcrypt/sha256.h       |   58 +++++++++
+ 7 files changed, 691 insertions(+), 0 deletions(-)
+ create mode 100644 libcrypt/sha256-crypt.c
+ create mode 100644 libcrypt/sha256.c
+ create mode 100644 libcrypt/sha256.h
+
+diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
+index eec3ee9..66e4efb 100644
+--- a/extra/Configs/Config.in
++++ b/extra/Configs/Config.in
+@@ -1137,6 +1137,13 @@ config UCLIBC_HAS_CRYPT_IMPL
+ 	help
+ 	  libcrypt contains crypt(), setkey() and encrypt()
+ 
++config UCLIBC_HAS_SHA256_CRYPT_IMPL
++	bool "libcrypt SHA256 support"
++	depends on UCLIBC_HAS_CRYPT_IMPL
++	help
++	  This adds support for SHA256 password hashing via the crypt() function.
++	  Say N here if you do not need SHA256 crypt support.
++
+ config UCLIBC_HAS_SHA512_CRYPT_IMPL
+ 	bool "libcrypt SHA512 support"
+ 	depends on UCLIBC_HAS_CRYPT_IMPL
+diff --git a/libcrypt/Makefile.in b/libcrypt/Makefile.in
+index 2fceaed..94753f4 100644
+--- a/libcrypt/Makefile.in
++++ b/libcrypt/Makefile.in
+@@ -21,6 +21,7 @@ libcrypt_OUT := $(top_builddir)libcrypt
+ 
+ libcrypt_SRC-y :=
+ libcrypt_SRC-$(UCLIBC_HAS_CRYPT_IMPL) += crypt.c des.c md5.c
++libcrypt_SRC-$(UCLIBC_HAS_SHA256_CRYPT_IMPL) += sha256.c sha256-crypt.c
+ libcrypt_SRC-$(UCLIBC_HAS_SHA512_CRYPT_IMPL) += sha512.c sha512-crypt.c
+ libcrypt_SRC-$(UCLIBC_HAS_CRYPT_STUB) += crypt_stub.c
+ 
+diff --git a/libcrypt/crypt.c b/libcrypt/crypt.c
+index b5bf9ee..188a6a0 100644
+--- a/libcrypt/crypt.c
++++ b/libcrypt/crypt.c
+@@ -19,6 +19,9 @@ static const struct {
+ 	const crypt_impl_f crypt_impl;
+ } crypt_impl_tab[] = {
+ 	{ "$1$",        __md5_crypt },
++#ifdef __UCLIBC_HAS_SHA256_CRYPT_IMPL__
++	{ "$5$",        __sha256_crypt },
++#endif
+ #ifdef __UCLIBC_HAS_SHA512_CRYPT_IMPL__
+ 	{ "$6$",        __sha512_crypt },
+ #endif
+diff --git a/libcrypt/libcrypt.h b/libcrypt/libcrypt.h
+index fcad6ae..67733d1 100644
+--- a/libcrypt/libcrypt.h
++++ b/libcrypt/libcrypt.h
+@@ -9,9 +9,11 @@
+ #define __LIBCRYPT_H__
+ 
+ extern char *__md5_crypt(const unsigned char *pw, const unsigned char *salt) attribute_hidden;
++extern char *__sha256_crypt(const unsigned char *pw, const unsigned char *salt) attribute_hidden;
+ extern char *__sha512_crypt(const unsigned char *pw, const unsigned char *salt) attribute_hidden;
+ extern char *__des_crypt(const unsigned char *pw, const unsigned char *salt) attribute_hidden;
+ 
++extern char *__sha256_crypt_r (const char *key, const char *salt, char *buffer, int buflen) attribute_hidden;
+ extern char *__sha512_crypt_r (const char *key, const char *salt, char *buffer, int buflen) attribute_hidden;
+ 
+ /* shut up gcc-4.x signed warnings */
+diff --git a/libcrypt/sha256-crypt.c b/libcrypt/sha256-crypt.c
+new file mode 100644
+index 0000000..4422148
+--- /dev/null
++++ b/libcrypt/sha256-crypt.c
+@@ -0,0 +1,326 @@
++/* One way encryption based on SHA256 sum.
++   Copyright (C) 2007, 2009 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Ulrich Drepper <drepper@redhat.com>, 2007.
++
++   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, write to the Free
++   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
++   02111-1307 USA.  */
++
++#include <assert.h>
++#include <errno.h>
++#include <stdbool.h>
++#include <stdlib.h>
++#include <string.h>
++#include <sys/param.h>
++
++#include "sha256.h"
++#include "libcrypt.h"
++
++/* Define our magic string to mark salt for SHA256 "encryption"
++   replacement.  */
++static const char sha256_salt_prefix[] = "$5$";
++
++/* Prefix for optional rounds specification.  */
++static const char sha256_rounds_prefix[] = "rounds=";
++
++/* Maximum salt string length.  */
++#define SALT_LEN_MAX 16
++/* Default number of rounds if not explicitly specified.  */
++#define ROUNDS_DEFAULT 5000
++/* Minimum number of rounds.  */
++#define ROUNDS_MIN 1000
++/* Maximum number of rounds.  */
++#define ROUNDS_MAX 999999999
++
++/* Table with characters for base64 transformation.  */
++static const char b64t[64] =
++"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
++
++#define B64_FROM_24BIT(b2, b1, b0, steps) \
++	{ \
++		int n = (steps); \
++		unsigned int w = ((b2) << 16) | ((b1) << 8) | (b0); \
++		while (n-- > 0 && buflen > 0) \
++		{ \
++			*cp++ = b64t[w & 0x3f]; \
++			--buflen; \
++			w >>= 6; \
++		} \
++	}
++
++char *
++__sha256_crypt_r (const char *key,
++     const char *salt,
++     char *buffer,
++     int buflen)
++{
++  unsigned char alt_result[32]
++    __attribute__ ((__aligned__ (__alignof__ (uint32_t))));
++  unsigned char temp_result[32]
++    __attribute__ ((__aligned__ (__alignof__ (uint32_t))));
++  size_t salt_len;
++  size_t key_len;
++  size_t cnt;
++  char *cp;
++  char *copied_key = NULL;
++  char *copied_salt = NULL;
++  char *p_bytes;
++  char *s_bytes;
++  /* Default number of rounds.  */
++  size_t rounds = ROUNDS_DEFAULT;
++  bool rounds_custom = false;
++
++  /* Find beginning of salt string.  The prefix should normally always
++     be present.  Just in case it is not.  */
++  if (strncmp (sha256_salt_prefix, salt, sizeof (sha256_salt_prefix) - 1) == 0)
++    /* Skip salt prefix.  */
++    salt += sizeof (sha256_salt_prefix) - 1;
++
++  if (strncmp (salt, sha256_rounds_prefix, sizeof (sha256_rounds_prefix) - 1)
++      == 0)
++    {
++      const char *num = salt + sizeof (sha256_rounds_prefix) - 1;
++      char *endp;
++      unsigned long int srounds = strtoul (num, &endp, 10);
++      if (*endp == '$')
++	{
++	  salt = endp + 1;
++	  rounds = MAX (ROUNDS_MIN, MIN (srounds, ROUNDS_MAX));
++	  rounds_custom = true;
++	}
++    }
++
++  salt_len = MIN (strcspn (salt, "$"), SALT_LEN_MAX);
++  key_len = strlen (key);
++
++  if ((key - (char *) 0) % __alignof__ (uint32_t) != 0)
++    {
++      char *tmp = (char *) alloca (key_len + __alignof__ (uint32_t));
++      key = copied_key =
++	memcpy (tmp + __alignof__ (uint32_t)
++		- (tmp - (char *) 0) % __alignof__ (uint32_t),
++		key, key_len);
++      assert ((key - (char *) 0) % __alignof__ (uint32_t) == 0);
++    }
++
++  if ((salt - (char *) 0) % __alignof__ (uint32_t) != 0)
++    {
++      char *tmp = (char *) alloca (salt_len + __alignof__ (uint32_t));
++      salt = copied_salt =
++	memcpy (tmp + __alignof__ (uint32_t)
++		- (tmp - (char *) 0) % __alignof__ (uint32_t),
++		salt, salt_len);
++      assert ((salt - (char *) 0) % __alignof__ (uint32_t) == 0);
++    }
++
++  struct sha256_ctx ctx;
++  struct sha256_ctx alt_ctx;
++
++  /* Prepare for the real work.  */
++  __sha256_init_ctx (&ctx);
++
++  /* Add the key string.  */
++  __sha256_process_bytes (key, key_len, &ctx);
++
++  /* The last part is the salt string.  This must be at most 16
++     characters and it ends at the first `$' character.  */
++  __sha256_process_bytes (salt, salt_len, &ctx);
++
++
++  /* Compute alternate SHA256 sum with input KEY, SALT, and KEY.  The
++     final result will be added to the first context.  */
++  __sha256_init_ctx (&alt_ctx);
++
++  /* Add key.  */
++  __sha256_process_bytes (key, key_len, &alt_ctx);
++
++  /* Add salt.  */
++  __sha256_process_bytes (salt, salt_len, &alt_ctx);
++
++  /* Add key again.  */
++  __sha256_process_bytes (key, key_len, &alt_ctx);
++
++  /* Now get result of this (32 bytes) and add it to the other
++     context.  */
++  __sha256_finish_ctx (&alt_ctx, alt_result);
++
++  /* Add for any character in the key one byte of the alternate sum.  */
++  for (cnt = key_len; cnt > 32; cnt -= 32)
++    __sha256_process_bytes (alt_result, 32, &ctx);
++  __sha256_process_bytes (alt_result, cnt, &ctx);
++
++  /* Take the binary representation of the length of the key and for every
++     1 add the alternate sum, for every 0 the key.  */
++  for (cnt = key_len; cnt > 0; cnt >>= 1)
++    if ((cnt & 1) != 0)
++      __sha256_process_bytes (alt_result, 32, &ctx);
++    else
++      __sha256_process_bytes (key, key_len, &ctx);
++
++  /* Create intermediate result.  */
++  __sha256_finish_ctx (&ctx, alt_result);
++
++  /* Start computation of P byte sequence.  */
++  __sha256_init_ctx (&alt_ctx);
++
++  /* For every character in the password add the entire password.  */
++  for (cnt = 0; cnt < key_len; ++cnt)
++    __sha256_process_bytes (key, key_len, &alt_ctx);
++
++  /* Finish the digest.  */
++  __sha256_finish_ctx (&alt_ctx, temp_result);
++
++  /* Create byte sequence P.  */
++  cp = p_bytes = alloca (key_len);
++  for (cnt = key_len; cnt >= 32; cnt -= 32)
++    cp = mempcpy (cp, temp_result, 32);
++  memcpy (cp, temp_result, cnt);
++
++  /* Start computation of S byte sequence.  */
++  __sha256_init_ctx (&alt_ctx);
++
++  /* For every character in the password add the entire password.  */
++  for (cnt = 0; cnt < 16 + alt_result[0]; ++cnt)
++    __sha256_process_bytes (salt, salt_len, &alt_ctx);
++
++  /* Finish the digest.  */
++  __sha256_finish_ctx (&alt_ctx, temp_result);
++
++  /* Create byte sequence S.  */
++  cp = s_bytes = alloca (salt_len);
++  for (cnt = salt_len; cnt >= 32; cnt -= 32)
++    cp = mempcpy (cp, temp_result, 32);
++  memcpy (cp, temp_result, cnt);
++
++  /* Repeatedly run the collected hash value through SHA256 to burn
++     CPU cycles.  */
++  for (cnt = 0; cnt < rounds; ++cnt)
++    {
++      /* New context.  */
++      __sha256_init_ctx (&ctx);
++
++      /* Add key or last result.  */
++      if ((cnt & 1) != 0)
++	__sha256_process_bytes (p_bytes, key_len, &ctx);
++      else
++	__sha256_process_bytes (alt_result, 32, &ctx);
++
++      /* Add salt for numbers not divisible by 3.  */
++      if (cnt % 3 != 0)
++	__sha256_process_bytes (s_bytes, salt_len, &ctx);
++
++      /* Add key for numbers not divisible by 7.  */
++      if (cnt % 7 != 0)
++	__sha256_process_bytes (p_bytes, key_len, &ctx);
++
++      /* Add key or last result.  */
++      if ((cnt & 1) != 0)
++	__sha256_process_bytes (alt_result, 32, &ctx);
++      else
++	__sha256_process_bytes (p_bytes, key_len, &ctx);
++
++      /* Create intermediate result.  */
++      __sha256_finish_ctx (&ctx, alt_result);
++    }
++
++  /* Now we can construct the result string.  It consists of three
++     parts.  */
++  cp = stpncpy (buffer, sha256_salt_prefix, MAX (0, buflen));
++  buflen -= sizeof (sha256_salt_prefix) - 1;
++
++  if (rounds_custom)
++    {
++      int n = snprintf (cp, MAX (0, buflen), "%s%zu$",
++			sha256_rounds_prefix, rounds);
++      cp += n;
++      buflen -= n;
++    }
++
++  cp = stpncpy (cp, salt, MIN ((size_t) MAX (0, buflen), salt_len));
++  buflen -= MIN ((size_t) MAX (0, buflen), salt_len);
++
++  if (buflen > 0)
++    {
++      *cp++ = '$';
++      --buflen;
++    }
++
++  B64_FROM_24BIT (alt_result[0], alt_result[10], alt_result[20], 4);
++  B64_FROM_24BIT (alt_result[21], alt_result[1], alt_result[11], 4);
++  B64_FROM_24BIT (alt_result[12], alt_result[22], alt_result[2], 4);
++  B64_FROM_24BIT (alt_result[3], alt_result[13], alt_result[23], 4);
++  B64_FROM_24BIT (alt_result[24], alt_result[4], alt_result[14], 4);
++  B64_FROM_24BIT (alt_result[15], alt_result[25], alt_result[5], 4);
++  B64_FROM_24BIT (alt_result[6], alt_result[16], alt_result[26], 4);
++  B64_FROM_24BIT (alt_result[27], alt_result[7], alt_result[17], 4);
++  B64_FROM_24BIT (alt_result[18], alt_result[28], alt_result[8], 4);
++  B64_FROM_24BIT (alt_result[9], alt_result[19], alt_result[29], 4);
++  B64_FROM_24BIT (0, alt_result[31], alt_result[30], 3);
++  if (buflen <= 0)
++    {
++      __set_errno (ERANGE);
++      buffer = NULL;
++    }
++  else
++    *cp = '\0';		/* Terminate the string.  */
++
++  /* Clear the buffer for the intermediate result so that people
++     attaching to processes or reading core dumps cannot get any
++     information.  We do it in this way to clear correct_words[]
++     inside the SHA256 implementation as well.  */
++  __sha256_init_ctx (&ctx);
++  __sha256_finish_ctx (&ctx, alt_result);
++  memset (&ctx, '\0', sizeof (ctx));
++  memset (&alt_ctx, '\0', sizeof (alt_ctx));
++
++  memset (temp_result, '\0', sizeof (temp_result));
++  memset (p_bytes, '\0', key_len);
++  memset (s_bytes, '\0', salt_len);
++  if (copied_key != NULL)
++    memset (copied_key, '\0', key_len);
++  if (copied_salt != NULL)
++    memset (copied_salt, '\0', salt_len);
++
++  return buffer;
++}
++
++static char *buffer;
++
++/* This entry point is equivalent to the `crypt' function in Unix
++   libcs.  */
++char *
++__sha256_crypt (const unsigned char *key, const unsigned char *salt)
++{
++  /* We don't want to have an arbitrary limit in the size of the
++     password.  We can compute an upper bound for the size of the
++     result in advance and so we can prepare the buffer we pass to
++     `sha256_crypt_r'.  */
++  static int buflen;
++  int needed = (sizeof (sha256_salt_prefix) - 1
++		+ sizeof (sha256_rounds_prefix) + 9 + 1
++		+ strlen (salt) + 1 + 43 + 1);
++
++  if (buflen < needed)
++    {
++      char *new_buffer = (char *) realloc (buffer, needed);
++      if (new_buffer == NULL)
++	return NULL;
++
++      buffer = new_buffer;
++      buflen = needed;
++    }
++
++  return __sha256_crypt_r ((const char *) key, (const char *) salt, buffer, buflen);
++}
+diff --git a/libcrypt/sha256.c b/libcrypt/sha256.c
+new file mode 100644
+index 0000000..e652a67
+--- /dev/null
++++ b/libcrypt/sha256.c
+@@ -0,0 +1,294 @@
++/* Functions to compute SHA256 message digest of files or memory blocks.
++   according to the definition of SHA256 in FIPS 180-2.
++   Copyright (C) 2007 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, write to the Free
++   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
++   02111-1307 USA.  */
++
++/* Written by Ulrich Drepper <drepper@redhat.com>, 2007.  */
++
++#ifdef HAVE_CONFIG_H
++# include <config.h>
++#endif
++
++#include <endian.h>
++#include <stdlib.h>
++#include <string.h>
++#include <sys/types.h>
++
++#include "sha256.h"
++
++#if __BYTE_ORDER == __LITTLE_ENDIAN
++# ifdef _LIBC
++#  include <byteswap.h>
++#  define SWAP(n) bswap_32 (n)
++# else
++#  define SWAP(n) \
++    (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
++# endif
++#else
++# define SWAP(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
++  };
++
++
++/* Process LEN bytes of BUFFER, accumulating context into CTX.
++   It is assumed that LEN % 64 == 0.  */
++static 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.  Do a double word increment.  */
++  ctx->total[0] += len;
++  if (ctx->total[0] < len)
++    ++ctx->total[1];
++
++  /* 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;
++}
++
++
++/* 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->total[0] = ctx->total[1] = 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->total[0] += bytes;
++  if (ctx->total[0] < bytes)
++    ++ctx->total[1];
++
++  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.  */
++  *(uint32_t *) &ctx->buffer[bytes + pad + 4] = SWAP (ctx->total[0] << 3);
++  *(uint32_t *) &ctx->buffer[bytes + pad] = SWAP ((ctx->total[1] << 3) |
++						  (ctx->total[0] >> 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)
++    {
++#if __GNUC__ >= 2
++# define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint32_t) != 0)
++#else
++# define UNALIGNED_P(p) (((uintptr_t) p) % sizeof (uint32_t) != 0)
++#endif
++      if (UNALIGNED_P (buffer))
++	while (len > 64)
++	  {
++	    sha256_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
++	    buffer = (const char *) buffer + 64;
++	    len -= 64;
++	  }
++      else
++	{
++	  sha256_process_block (buffer, len & ~63, ctx);
++	  buffer = (const char *) buffer + (len & ~63);
++	  len &= 63;
++	}
++    }
++
++  /* 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;
++    }
++}
+diff --git a/libcrypt/sha256.h b/libcrypt/sha256.h
+new file mode 100644
+index 0000000..291674f
+--- /dev/null
++++ b/libcrypt/sha256.h
+@@ -0,0 +1,58 @@
++/* Declaration of functions and data types used for SHA256 sum computing
++   library functions.
++   Copyright (C) 2007 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, write to the Free
++   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
++   02111-1307 USA.  */
++
++#ifndef _SHA256_H
++#define _SHA256_H 1
++
++#include <limits.h>
++#include <stdint.h>
++#include <stdio.h>
++
++
++/* Structure to save state of computation between the single steps.  */
++struct sha256_ctx
++{
++  uint32_t H[8];
++
++  uint32_t total[2];
++  uint32_t buflen;
++  char buffer[128] __attribute__ ((__aligned__ (__alignof__ (uint32_t))));
++};
++
++/* Initialize structure containing state of computation.
++   (FIPS 180-2: 5.3.2)  */
++extern void __sha256_init_ctx (struct sha256_ctx *ctx) attribute_hidden;
++
++/* Starting with the result of former calls of this function (or the
++   initialization function update the context for the next LEN bytes
++   starting at BUFFER.
++   It is NOT required that LEN is a multiple of 64.  */
++extern void __sha256_process_bytes (const void *buffer, size_t len,
++				    struct sha256_ctx *ctx) attribute_hidden;
++
++/* Process the remaining bytes in the buffer and put result from CTX
++   in first 32 bytes following RESBUF.
++
++   IMPORTANT: On some systems it is required that RESBUF is correctly
++   aligned for a 32 bits value.  */
++extern void *__sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf)
++  attribute_hidden;
++
++#endif /* sha256.h */
+-- 
+1.7.8
+