Merge common parts of sha1sum and md5sum, which is everything except the

algorithms.
Move algorithms to hash_fd and make them available via a common
function.

2 files changed, 849 insertions, 1 deletions

diff --git a/libbb/Makefile.in b/libbb/Makefile.in
index bb98965..979419b 100644
--- a/libbb/Makefile.in
+++ b/libbb/Makefile.in
@@ -30,7 +30,7 @@ LIBBB_SRC:= \
 	device_open.c dump.c error_msg.c error_msg_and_die.c find_mount_point.c \
 	find_pid_by_name.c find_root_device.c fgets_str.c full_read.c \
 	full_write.c get_last_path_component.c get_line_from_file.c get_ug_id.c \
-	get_terminal_width_height.c herror_msg.c herror_msg_and_die.c \
+	get_terminal_width_height.c hash_fd.c herror_msg.c herror_msg_and_die.c \
 	human_readable.c inet_common.c inode_hash.c interface.c isdirectory.c \
 	kernel_version.c last_char_is.c llist_add_to.c login.c loop.c \
 	make_directory.c mode_string.c module_syscalls.c mtab.c mtab_file.c \
diff --git a/libbb/hash_fd.c b/libbb/hash_fd.c
new file mode 100644
index 0000000..b95c136
--- /dev/null
+++ b/libbb/hash_fd.c
@@ -0,0 +1,848 @@
+/*
+ *  Based on shasum from http://www.netsw.org/crypto/hash/
+ *  Majorly hacked up to use Dr Brian Gladman's sha1 code
+ *
+ *  Copyright (C) 2003 Glenn L. McGrath
+ *  Copyright (C) 2003 Erik Andersen
+ * 
+ *  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, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <byteswap.h>
+#include <endian.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "busybox.h"
+
+
+#ifdef CONFIG_SHA1SUM
+/*
+ ---------------------------------------------------------------------------
+ Begin Dr. Gladman's sha1 code
+ ---------------------------------------------------------------------------
+*/
+
+/*
+ ---------------------------------------------------------------------------
+ Copyright (c) 2002, Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
+ All rights reserved.
+
+ LICENSE TERMS
+
+ The free distribution and use of this software in both source and binary 
+ form is allowed (with or without changes) provided that:
+
+   1. distributions of this source code include the above copyright 
+      notice, this list of conditions and the following disclaimer;
+
+   2. distributions in binary form include the above copyright
+      notice, this list of conditions and the following disclaimer
+      in the documentation and/or other associated materials;
+
+   3. the copyright holder's name is not used to endorse products 
+      built using this software without specific written permission. 
+
+ ALTERNATIVELY, provided that this notice is retained in full, this product
+ may be distributed under the terms of the GNU General Public License (GPL),
+ in which case the provisions of the GPL apply INSTEAD OF those given above.
+ 
+ DISCLAIMER
+
+ This software is provided 'as is' with no explicit or implied warranties
+ in respect of its properties, including, but not limited to, correctness 
+ and/or fitness for purpose.
+ ---------------------------------------------------------------------------
+ Issue Date: 10/11/2002
+
+ This is a byte oriented version of SHA1 that operates on arrays of bytes
+ stored in memory. It runs at 22 cycles per byte on a Pentium P4 processor
+*/
+
+# define SHA1_BLOCK_SIZE  64
+# define SHA1_DIGEST_SIZE 20
+# define SHA1_HASH_SIZE   SHA1_DIGEST_SIZE
+# define SHA2_GOOD        0
+# define SHA2_BAD         1
+
+# define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))
+
+# if __BYTE_ORDER == __BIG_ENDIAN
+#  define swap_b32(x) (x)
+# elif defined(bswap_32)
+#  define swap_b32(x) bswap_32(x)
+# else
+#  define swap_b32(x) ((rotl32((x), 8) & 0x00ff00ff) | (rotl32((x), 24) & 0xff00ff00))
+# endif /* __BYTE_ORDER */
+
+# define SHA1_MASK   (SHA1_BLOCK_SIZE - 1)
+
+/* reverse byte order in 32-bit words   */
+# define ch(x,y,z)       (((x) & (y)) ^ (~(x) & (z)))
+# define parity(x,y,z)   ((x) ^ (y) ^ (z))
+# define maj(x,y,z)      (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
+
+/* A normal version as set out in the FIPS. This version uses   */
+/* partial loop unrolling and is optimised for the Pentium 4    */
+# define rnd(f,k)    \
+    t = a; a = rotl32(a,5) + f(b,c,d) + e + k + w[i]; \
+    e = d; d = c; c = rotl32(b, 30); b = t
+
+/* type to hold the SHA1 context  */
+typedef struct {
+	uint32_t count[2];
+	uint32_t hash[5];
+	uint32_t wbuf[16];
+} sha1_ctx;
+
+static void sha1_compile(sha1_ctx ctx[1])
+{
+	uint32_t w[80], i, a, b, c, d, e, t;
+
+	/* note that words are compiled from the buffer into 32-bit */
+	/* words in big-endian order so an order reversal is needed */
+	/* here on little endian machines                           */
+	for (i = 0; i < SHA1_BLOCK_SIZE / 4; ++i)
+		w[i] = swap_b32(ctx->wbuf[i]);
+
+	for (i = SHA1_BLOCK_SIZE / 4; i < 80; ++i)
+		w[i] = rotl32(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1);
+
+	a = ctx->hash[0];
+	b = ctx->hash[1];
+	c = ctx->hash[2];
+	d = ctx->hash[3];
+	e = ctx->hash[4];
+
+	for (i = 0; i < 20; ++i) {
+		rnd(ch, 0x5a827999);
+	}
+
+	for (i = 20; i < 40; ++i) {
+		rnd(parity, 0x6ed9eba1);
+	}
+
+	for (i = 40; i < 60; ++i) {
+		rnd(maj, 0x8f1bbcdc);
+	}
+
+	for (i = 60; i < 80; ++i) {
+		rnd(parity, 0xca62c1d6);
+	}
+
+	ctx->hash[0] += a;
+	ctx->hash[1] += b;
+	ctx->hash[2] += c;
+	ctx->hash[3] += d;
+	ctx->hash[4] += e;
+}
+
+static void sha1_begin(sha1_ctx ctx[1])
+{
+	ctx->count[0] = ctx->count[1] = 0;
+	ctx->hash[0] = 0x67452301;
+	ctx->hash[1] = 0xefcdab89;
+	ctx->hash[2] = 0x98badcfe;
+	ctx->hash[3] = 0x10325476;
+	ctx->hash[4] = 0xc3d2e1f0;
+}
+
+/* SHA1 hash data in an array of bytes into hash buffer and call the        */
+/* hash_compile function as required.                                       */
+static void sha1_hash(const unsigned char data[], unsigned int len, sha1_ctx ctx[1])
+{
+	uint32_t pos = (uint32_t) (ctx->count[0] & SHA1_MASK),
+		freeb = SHA1_BLOCK_SIZE - pos;
+	const unsigned char *sp = data;
+
+	if ((ctx->count[0] += len) < len)
+		++(ctx->count[1]);
+
+	while (len >= freeb) {	/* tranfer whole blocks while possible  */
+		memcpy(((unsigned char *) ctx->wbuf) + pos, sp, freeb);
+		sp += freeb;
+		len -= freeb;
+		freeb = SHA1_BLOCK_SIZE;
+		pos = 0;
+		sha1_compile(ctx);
+	}
+
+	memcpy(((unsigned char *) ctx->wbuf) + pos, sp, len);
+}
+
+/* SHA1 Final padding and digest calculation  */
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+static uint32_t mask[4] = { 0x00000000, 0x000000ff, 0x0000ffff, 0x00ffffff };
+static uint32_t bits[4] = { 0x00000080, 0x00008000, 0x00800000, 0x80000000 };
+# else
+static uint32_t mask[4] = { 0x00000000, 0xff000000, 0xffff0000, 0xffffff00 };
+static uint32_t bits[4] = { 0x80000000, 0x00800000, 0x00008000, 0x00000080 };
+# endif /* __BYTE_ORDER */
+
+void sha1_end(unsigned char hval[], sha1_ctx ctx[1])
+{
+	uint32_t i, cnt = (uint32_t) (ctx->count[0] & SHA1_MASK);
+
+	/* mask out the rest of any partial 32-bit word and then set    */
+	/* the next byte to 0x80. On big-endian machines any bytes in   */
+	/* the buffer will be at the top end of 32 bit words, on little */
+	/* endian machines they will be at the bottom. Hence the AND    */
+	/* and OR masks above are reversed for little endian systems    */
+	ctx->wbuf[cnt >> 2] =
+		(ctx->wbuf[cnt >> 2] & mask[cnt & 3]) | bits[cnt & 3];
+
+	/* we need 9 or more empty positions, one for the padding byte  */
+	/* (above) and eight for the length count.  If there is not     */
+	/* enough space pad and empty the buffer                        */
+	if (cnt > SHA1_BLOCK_SIZE - 9) {
+		if (cnt < 60)
+			ctx->wbuf[15] = 0;
+		sha1_compile(ctx);
+		cnt = 0;
+	} else				/* compute a word index for the empty buffer positions  */
+		cnt = (cnt >> 2) + 1;
+
+	while (cnt < 14)	/* and zero pad all but last two positions      */
+		ctx->wbuf[cnt++] = 0;
+
+	/* assemble the eight byte counter in the buffer in big-endian  */
+	/* format                                                       */
+
+	ctx->wbuf[14] = swap_b32((ctx->count[1] << 3) | (ctx->count[0] >> 29));
+	ctx->wbuf[15] = swap_b32(ctx->count[0] << 3);
+
+	sha1_compile(ctx);
+
+	/* extract the hash value as bytes in case the hash buffer is   */
+	/* misaligned for 32-bit words                                  */
+
+	for (i = 0; i < SHA1_DIGEST_SIZE; ++i)
+		hval[i] = (unsigned char) (ctx->hash[i >> 2] >> 8 * (~i & 3));
+}
+
+/*
+ ---------------------------------------------------------------------------
+ End of Dr. Gladman's sha1 code
+ ---------------------------------------------------------------------------
+*/
+#endif	/* CONFIG_SHA1 */
+
+
+
+
+
+#ifdef CONFIG_MD5SUM
+/*
+ * md5sum.c - Compute MD5 checksum of files or strings according to the
+ *            definition of MD5 in RFC 1321 from April 1992.
+ *
+ * Copyright (C) 1995-1999 Free Software Foundation, Inc.
+ * Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
+ *
+ *
+ * June 29, 2001        Manuel Novoa III
+ *
+ * Added MD5SUM_SIZE_VS_SPEED configuration option.
+ *
+ * Current valid values, with data from my system for comparison, are:
+ *   (using uClibc and running on linux-2.4.4.tar.bz2)
+ *                     user times (sec)  text size (386)
+ *     0 (fastest)         1.1                6144
+ *     1                   1.4                5392
+ *     2                   3.0                5088
+ *     3 (smallest)        5.1                4912
+ */
+
+# define MD5SUM_SIZE_VS_SPEED 2
+
+/* Handle endian-ness */
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  define SWAP(n) (n)
+# else
+#  define SWAP(n) ((n << 24) | ((n&65280)<<8) | ((n&16711680)>>8) | (n>>24))
+# endif
+
+# if MD5SUM_SIZE_VS_SPEED == 0
+/* This array contains the bytes used to pad the buffer to the next
+   64-byte boundary.  (RFC 1321, 3.1: Step 1)  */
+static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ...  */  };
+# endif	/* MD5SUM_SIZE_VS_SPEED == 0 */
+
+typedef u_int32_t md5_uint32;
+
+/* Structure to save state of computation between the single steps.  */
+struct md5_ctx {
+	md5_uint32 A;
+	md5_uint32 B;
+	md5_uint32 C;
+	md5_uint32 D;
+
+	md5_uint32 total[2];
+	md5_uint32 buflen;
+	char buffer[128];
+};
+
+/* Initialize structure containing state of computation.
+ * (RFC 1321, 3.3: Step 3)
+ */
+static void md5_begin(struct md5_ctx *ctx)
+{
+	ctx->A = 0x67452301;
+	ctx->B = 0xefcdab89;
+	ctx->C = 0x98badcfe;
+	ctx->D = 0x10325476;
+
+	ctx->total[0] = ctx->total[1] = 0;
+	ctx->buflen = 0;
+}
+
+/* These are the four functions used in the four steps of the MD5 algorithm
+ * and defined in the RFC 1321.  The first function is a little bit optimized
+ * (as found in Colin Plumbs public domain implementation).
+ * #define FF(b, c, d) ((b & c) | (~b & d))
+ */
+# define FF(b, c, d) (d ^ (b & (c ^ d)))
+# define FG(b, c, d) FF (d, b, c)
+# define FH(b, c, d) (b ^ c ^ d)
+# define FI(b, c, d) (c ^ (b | ~d))
+
+/* 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 necessary that LEN is a multiple of 64!!!
+ */
+static void md5_hash_block(const void *buffer, size_t len,
+						   struct md5_ctx *ctx)
+{
+	md5_uint32 correct_words[16];
+	const md5_uint32 *words = buffer;
+	size_t nwords = len / sizeof(md5_uint32);
+	const md5_uint32 *endp = words + nwords;
+
+# if MD5SUM_SIZE_VS_SPEED > 0
+	static const md5_uint32 C_array[] = {
+		/* round 1 */
+		0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
+		0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
+		0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
+		0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
+		/* round 2 */
+		0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
+		0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8,
+		0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
+		0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
+		/* round 3 */
+		0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
+		0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
+		0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
+		0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
+		/* round 4 */
+		0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
+		0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
+		0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
+		0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
+	};
+
+	static const char P_array[] = {
+#  if MD5SUM_SIZE_VS_SPEED > 1
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,	/* 1 */
+#  endif	/* MD5SUM_SIZE_VS_SPEED > 1 */
+		1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12,	/* 2 */
+		5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2,	/* 3 */
+		0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9	/* 4 */
+	};
+
+#  if MD5SUM_SIZE_VS_SPEED > 1
+	static const char S_array[] = {
+		7, 12, 17, 22,
+		5, 9, 14, 20,
+		4, 11, 16, 23,
+		6, 10, 15, 21
+	};
+#  endif	/* MD5SUM_SIZE_VS_SPEED > 1 */
+# endif
+
+	md5_uint32 A = ctx->A;
+	md5_uint32 B = ctx->B;
+	md5_uint32 C = ctx->C;
+	md5_uint32 D = ctx->D;
+
+	/* First increment the byte count.  RFC 1321 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 (words < endp) {
+		md5_uint32 *cwp = correct_words;
+		md5_uint32 A_save = A;
+		md5_uint32 B_save = B;
+		md5_uint32 C_save = C;
+		md5_uint32 D_save = D;
+
+# if MD5SUM_SIZE_VS_SPEED > 1
+#  define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
+
+		const md5_uint32 *pc;
+		const char *pp;
+		const char *ps;
+		int i;
+		md5_uint32 temp;
+
+		for (i = 0; i < 16; i++) {
+			cwp[i] = SWAP(words[i]);
+		}
+		words += 16;
+
+#  if MD5SUM_SIZE_VS_SPEED > 2
+		pc = C_array;
+		pp = P_array;
+		ps = S_array - 4;
+
+		for (i = 0; i < 64; i++) {
+			if ((i & 0x0f) == 0)
+				ps += 4;
+			temp = A;
+			switch (i >> 4) {
+			case 0:
+				temp += FF(B, C, D);
+				break;
+			case 1:
+				temp += FG(B, C, D);
+				break;
+			case 2:
+				temp += FH(B, C, D);
+				break;
+			case 3:
+				temp += FI(B, C, D);
+			}
+			temp += cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+#  else
+		pc = C_array;
+		pp = P_array;
+		ps = S_array;
+
+		for (i = 0; i < 16; i++) {
+			temp = A + FF(B, C, D) + cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+
+		ps += 4;
+		for (i = 0; i < 16; i++) {
+			temp = A + FG(B, C, D) + cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+		ps += 4;
+		for (i = 0; i < 16; i++) {
+			temp = A + FH(B, C, D) + cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+		ps += 4;
+		for (i = 0; i < 16; i++) {
+			temp = A + FI(B, C, D) + cwp[(int) (*pp++)] + *pc++;
+			CYCLIC(temp, ps[i & 3]);
+			temp += B;
+			A = D;
+			D = C;
+			C = B;
+			B = temp;
+		}
+
+#  endif	/* MD5SUM_SIZE_VS_SPEED > 2 */
+# else
+		/* First round: using the given function, the context and a constant
+		   the next context is computed.  Because the algorithms processing
+		   unit is a 32-bit word and it is determined to work on words in
+		   little endian byte order we perhaps have to change the byte order
+		   before the computation.  To reduce the work for the next steps
+		   we store the swapped words in the array CORRECT_WORDS.  */
+
+#  define OP(a, b, c, d, s, T)	\
+      do	\
+        {	\
+	  a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T;	\
+	  ++words;	\
+	  CYCLIC (a, s);	\
+	  a += b;	\
+        }	\
+      while (0)
+
+		/* It is unfortunate that C does not provide an operator for
+		   cyclic rotation.  Hope the C compiler is smart enough.  */
+		/* gcc 2.95.4 seems to be --aaronl */
+#  define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
+
+		/* Before we start, one word to the strange constants.
+		   They are defined in RFC 1321 as
+
+		   T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
+		 */
+
+#  if MD5SUM_SIZE_VS_SPEED == 1
+		const md5_uint32 *pc;
+		const char *pp;
+		int i;
+#  endif	/* MD5SUM_SIZE_VS_SPEED */
+
+		/* Round 1.  */
+#  if MD5SUM_SIZE_VS_SPEED == 1
+		pc = C_array;
+		for (i = 0; i < 4; i++) {
+			OP(A, B, C, D, 7, *pc++);
+			OP(D, A, B, C, 12, *pc++);
+			OP(C, D, A, B, 17, *pc++);
+			OP(B, C, D, A, 22, *pc++);
+		}
+#  else
+		OP(A, B, C, D, 7, 0xd76aa478);
+		OP(D, A, B, C, 12, 0xe8c7b756);
+		OP(C, D, A, B, 17, 0x242070db);
+		OP(B, C, D, A, 22, 0xc1bdceee);
+		OP(A, B, C, D, 7, 0xf57c0faf);
+		OP(D, A, B, C, 12, 0x4787c62a);
+		OP(C, D, A, B, 17, 0xa8304613);
+		OP(B, C, D, A, 22, 0xfd469501);
+		OP(A, B, C, D, 7, 0x698098d8);
+		OP(D, A, B, C, 12, 0x8b44f7af);
+		OP(C, D, A, B, 17, 0xffff5bb1);
+		OP(B, C, D, A, 22, 0x895cd7be);
+		OP(A, B, C, D, 7, 0x6b901122);
+		OP(D, A, B, C, 12, 0xfd987193);
+		OP(C, D, A, B, 17, 0xa679438e);
+		OP(B, C, D, A, 22, 0x49b40821);
+#  endif	/* MD5SUM_SIZE_VS_SPEED == 1 */
+
+		/* For the second to fourth round we have the possibly swapped words
+		   in CORRECT_WORDS.  Redefine the macro to take an additional first
+		   argument specifying the function to use.  */
+#  undef OP
+#  define OP(f, a, b, c, d, k, s, T)	\
+      do	\
+	{	\
+	  a += f (b, c, d) + correct_words[k] + T;	\
+	  CYCLIC (a, s);	\
+	  a += b;	\
+	}	\
+      while (0)
+
+		/* Round 2.  */
+#  if MD5SUM_SIZE_VS_SPEED == 1
+		pp = P_array;
+		for (i = 0; i < 4; i++) {
+			OP(FG, A, B, C, D, (int) (*pp++), 5, *pc++);
+			OP(FG, D, A, B, C, (int) (*pp++), 9, *pc++);
+			OP(FG, C, D, A, B, (int) (*pp++), 14, *pc++);
+			OP(FG, B, C, D, A, (int) (*pp++), 20, *pc++);
+		}
+#  else
+		OP(FG, A, B, C, D, 1, 5, 0xf61e2562);
+		OP(FG, D, A, B, C, 6, 9, 0xc040b340);
+		OP(FG, C, D, A, B, 11, 14, 0x265e5a51);
+		OP(FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
+		OP(FG, A, B, C, D, 5, 5, 0xd62f105d);
+		OP(FG, D, A, B, C, 10, 9, 0x02441453);
+		OP(FG, C, D, A, B, 15, 14, 0xd8a1e681);
+		OP(FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
+		OP(FG, A, B, C, D, 9, 5, 0x21e1cde6);
+		OP(FG, D, A, B, C, 14, 9, 0xc33707d6);
+		OP(FG, C, D, A, B, 3, 14, 0xf4d50d87);
+		OP(FG, B, C, D, A, 8, 20, 0x455a14ed);
+		OP(FG, A, B, C, D, 13, 5, 0xa9e3e905);
+		OP(FG, D, A, B, C, 2, 9, 0xfcefa3f8);
+		OP(FG, C, D, A, B, 7, 14, 0x676f02d9);
+		OP(FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
+#  endif	/* MD5SUM_SIZE_VS_SPEED == 1 */
+
+		/* Round 3.  */
+#  if MD5SUM_SIZE_VS_SPEED == 1
+		for (i = 0; i < 4; i++) {
+			OP(FH, A, B, C, D, (int) (*pp++), 4, *pc++);
+			OP(FH, D, A, B, C, (int) (*pp++), 11, *pc++);
+			OP(FH, C, D, A, B, (int) (*pp++), 16, *pc++);
+			OP(FH, B, C, D, A, (int) (*pp++), 23, *pc++);
+		}
+#  else
+		OP(FH, A, B, C, D, 5, 4, 0xfffa3942);
+		OP(FH, D, A, B, C, 8, 11, 0x8771f681);
+		OP(FH, C, D, A, B, 11, 16, 0x6d9d6122);
+		OP(FH, B, C, D, A, 14, 23, 0xfde5380c);
+		OP(FH, A, B, C, D, 1, 4, 0xa4beea44);
+		OP(FH, D, A, B, C, 4, 11, 0x4bdecfa9);
+		OP(FH, C, D, A, B, 7, 16, 0xf6bb4b60);
+		OP(FH, B, C, D, A, 10, 23, 0xbebfbc70);
+		OP(FH, A, B, C, D, 13, 4, 0x289b7ec6);
+		OP(FH, D, A, B, C, 0, 11, 0xeaa127fa);
+		OP(FH, C, D, A, B, 3, 16, 0xd4ef3085);
+		OP(FH, B, C, D, A, 6, 23, 0x04881d05);
+		OP(FH, A, B, C, D, 9, 4, 0xd9d4d039);
+		OP(FH, D, A, B, C, 12, 11, 0xe6db99e5);
+		OP(FH, C, D, A, B, 15, 16, 0x1fa27cf8);
+		OP(FH, B, C, D, A, 2, 23, 0xc4ac5665);
+#  endif	/* MD5SUM_SIZE_VS_SPEED == 1 */
+
+		/* Round 4.  */
+#  if MD5SUM_SIZE_VS_SPEED == 1
+		for (i = 0; i < 4; i++) {
+			OP(FI, A, B, C, D, (int) (*pp++), 6, *pc++);
+			OP(FI, D, A, B, C, (int) (*pp++), 10, *pc++);
+			OP(FI, C, D, A, B, (int) (*pp++), 15, *pc++);
+			OP(FI, B, C, D, A, (int) (*pp++), 21, *pc++);
+		}
+#  else
+		OP(FI, A, B, C, D, 0, 6, 0xf4292244);
+		OP(FI, D, A, B, C, 7, 10, 0x432aff97);
+		OP(FI, C, D, A, B, 14, 15, 0xab9423a7);
+		OP(FI, B, C, D, A, 5, 21, 0xfc93a039);
+		OP(FI, A, B, C, D, 12, 6, 0x655b59c3);
+		OP(FI, D, A, B, C, 3, 10, 0x8f0ccc92);
+		OP(FI, C, D, A, B, 10, 15, 0xffeff47d);
+		OP(FI, B, C, D, A, 1, 21, 0x85845dd1);
+		OP(FI, A, B, C, D, 8, 6, 0x6fa87e4f);
+		OP(FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
+		OP(FI, C, D, A, B, 6, 15, 0xa3014314);
+		OP(FI, B, C, D, A, 13, 21, 0x4e0811a1);
+		OP(FI, A, B, C, D, 4, 6, 0xf7537e82);
+		OP(FI, D, A, B, C, 11, 10, 0xbd3af235);
+		OP(FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
+		OP(FI, B, C, D, A, 9, 21, 0xeb86d391);
+#  endif	/* MD5SUM_SIZE_VS_SPEED == 1 */
+# endif	/* MD5SUM_SIZE_VS_SPEED > 1 */
+
+		/* Add the starting values of the context.  */
+		A += A_save;
+		B += B_save;
+		C += C_save;
+		D += D_save;
+	}
+
+	/* Put checksum in context given as argument.  */
+	ctx->A = A;
+	ctx->B = B;
+	ctx->C = C;
+	ctx->D = D;
+}
+
+/* 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.
+ */
+
+static void md5_hash_bytes(const void *buffer, size_t len,
+						   struct md5_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 (left_over + add > 64) {
+			md5_hash_block(ctx->buffer, (left_over + add) & ~63, ctx);
+			/* The regions in the following copy operation cannot overlap.  */
+			memcpy(ctx->buffer, &ctx->buffer[(left_over + add) & ~63],
+				   (left_over + add) & 63);
+			ctx->buflen = (left_over + add) & 63;
+		}
+
+		buffer = (const char *) buffer + add;
+		len -= add;
+	}
+
+	/* Process available complete blocks.  */
+	if (len > 64) {
+		md5_hash_block(buffer, len & ~63, ctx);
+		buffer = (const char *) buffer + (len & ~63);
+		len &= 63;
+	}
+
+	/* Move remaining bytes in internal buffer.  */
+	if (len > 0) {
+		memcpy(ctx->buffer, buffer, len);
+		ctx->buflen = len;
+	}
+}
+
+/* Process the remaining bytes in the buffer and put result from CTX
+ * in first 16 bytes following RESBUF.  The result is always in little
+ * endian byte order, so that a byte-wise output yields to the wanted
+ * ASCII representation of the message digest.
+ *
+ * IMPORTANT: On some systems it is required that RESBUF is correctly
+ * aligned for a 32 bits value.
+ */
+static void *md5_end(void *resbuf, struct md5_ctx *ctx)
+{
+	/* Take yet unprocessed bytes into account.  */
+	md5_uint32 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;
+# if MD5SUM_SIZE_VS_SPEED > 0
+	memset(&ctx->buffer[bytes], 0, pad);
+	ctx->buffer[bytes] = 0x80;
+# else
+	memcpy(&ctx->buffer[bytes], fillbuf, pad);
+# endif	/* MD5SUM_SIZE_VS_SPEED > 0 */
+
+	/* Put the 64-bit file length in *bits* at the end of the buffer.  */
+	*(md5_uint32 *) & ctx->buffer[bytes + pad] = SWAP(ctx->total[0] << 3);
+	*(md5_uint32 *) & ctx->buffer[bytes + pad + 4] =
+		SWAP(((ctx->total[1] << 3) | (ctx->total[0] >> 29)));
+
+	/* Process last bytes.  */
+	md5_hash_block(ctx->buffer, bytes + pad + 8, ctx);
+
+	/* Put result from CTX in first 16 bytes following RESBUF.  The result is
+	 * always in little endian byte order, so that a byte-wise output yields
+	 * to the wanted ASCII representation of the message digest.
+	 *
+	 * IMPORTANT: On some systems it is required that RESBUF is correctly
+	 * aligned for a 32 bits value.
+	 */
+	((md5_uint32 *) resbuf)[0] = SWAP(ctx->A);
+	((md5_uint32 *) resbuf)[1] = SWAP(ctx->B);
+	((md5_uint32 *) resbuf)[2] = SWAP(ctx->C);
+	((md5_uint32 *) resbuf)[3] = SWAP(ctx->D);
+
+	return resbuf;
+}
+#endif	/* CONFIG_MD5SUM */
+
+
+
+
+extern int hash_fd(int src_fd, const off_t size, const uint8_t hash_algo,
+				   uint8_t * hashval)
+{
+	int result = EXIT_SUCCESS;
+	off_t hashed_count = 0;
+	unsigned int blocksize = 0;
+	unsigned char *buffer = NULL;
+#ifdef CONFIG_SHA1SUM
+	sha1_ctx sha1_cx[1];
+#endif
+#ifdef CONFIG_MD5SUM
+	struct md5_ctx md5_cx;
+#endif
+
+
+#ifdef CONFIG_SHA1SUM
+	if (hash_algo == HASH_SHA1) {
+		/* Ensure that BLOCKSIZE is a multiple of 64.  */
+		blocksize = 65536;
+		buffer = malloc(blocksize);
+	}
+#endif
+#ifdef CONFIG_MD5SUM
+	if (hash_algo == HASH_MD5) {
+		blocksize = 4096;
+		buffer = malloc(blocksize + 72);
+	}
+#endif
+	
+	/* Initialize the computation context.  */
+#ifdef CONFIG_SHA1SUM
+	if (hash_algo == HASH_SHA1) {
+		sha1_begin(sha1_cx);
+	}
+#endif
+#ifdef CONFIG_MD5SUM
+	if (hash_algo == HASH_MD5) {
+		md5_begin(&md5_cx);
+	}
+#endif
+	/* Iterate over full file contents.  */
+	do {
+		const ssize_t count = bb_full_read(src_fd, buffer, blocksize);
+
+		if (count < 1) {
+			/* count == 0 means short read
+			 * count == -1 means read error */
+			result = count - 1;
+			break;
+		}
+		hashed_count += count;
+
+		/* Process buffer */
+#ifdef CONFIG_SHA1SUM
+		if (hash_algo == HASH_SHA1) {
+			sha1_hash(buffer, count, sha1_cx);
+		}
+#endif
+#ifdef CONFIG_MD5SUM
+		if (hash_algo == HASH_MD5) {
+			if (count % 64 == 0) {
+				md5_hash_block(buffer, count, &md5_cx);
+			} else {
+				md5_hash_bytes(buffer, count, &md5_cx);
+			}
+		}
+#endif
+	} while ((size == (off_t) - 1) || (hashed_count < size));
+
+	/* Finalize and write the hash into our buffer.  */
+#ifdef CONFIG_SHA1SUM
+	if (hash_algo == HASH_SHA1) {
+		sha1_end(hashval, sha1_cx);
+	}
+#endif
+#ifdef CONFIG_MD5SUM
+	if (hash_algo == HASH_MD5) {
+		md5_end(hashval, &md5_cx);
+	}
+#endif
+
+	free(buffer);
+	return result;
+}