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+/* md5.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.
+ *
+ * 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, 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.
+ */
+
+/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu> */
+/* Hacked to work with BusyBox by Alfred M. Szmidt <ams@trillian.itslinux.org> */
+
+/* Sucked directly into ipkg since the md5sum functions aren't in libbb
+ Dropped a few functions since ipkg only needs md5_stream.
+ Got rid of evil, twisted defines of FALSE=1 and TRUE=0
+ 6 March 2002 Carl Worth <cworth@east.isi.edu>
+*/
+
+/*
+ * 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 0
+
+/**********************************************************************/
+
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <endian.h>
+#include <sys/types.h>
+#if defined HAVE_LIMITS_H
+# include <limits.h>
+#endif
+
+#include "md5.h"
+
+/* 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
+
+/* 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))
+
+#define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
+
+/* Process LEN bytes of BUFFER, accumulating context into CTX.
+ It is assumed that LEN % 64 == 0. */
+static void md5_process_block(struct md5_ctx *ctx,
+ const void *buffer, size_t len)
+{
+ 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
+ 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
+#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
+ 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++;
+ temp = 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++;
+ temp = 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++;
+ temp = 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++;
+ temp = 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++;
+ temp = CYCLIC (temp, ps[i&3]);
+ temp += B;
+ A = D; D = C; C = B; B = temp;
+ }
+
+#endif
+#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)
+
+ /* 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
+
+ /* 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
+
+ /* 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
+
+ /* 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
+
+ /* 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
+#endif
+
+ /* 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;
+}
+
+/* Initialize structure containing state of computation.
+ (RFC 1321, 3.3: Step 3) */
+void md5_init(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;
+}
+
+void md5_process(struct md5_ctx *ctx, const void *buffer, size_t len)
+{
+ /* 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_process_block(ctx, ctx->buffer, (left_over + add) & ~63);
+ /* 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_process_block(ctx, buffer, len & ~63);
+ 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 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 md5_finish(struct md5_ctx *ctx, md5sum_t resbuf)
+{
+ /* 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
+
+ /* 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_process_block(ctx, ctx->buffer, bytes + pad + 8);
+
+ /* 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);
+}
+