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276
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1 /* md5.c - Functions to compute MD5 message digest of files or memory blocks
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2 according to the definition of MD5 in RFC 1321 from April 1992.
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3 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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4 NOTE: The canonical source of this file is maintained with the GNU C
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5 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
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0
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6
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276
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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0
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11
|
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276
|
12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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0
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16
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276
|
17 You should have received a copy of the GNU General Public License
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|
|
18 along with this program; if not, write to the Free Software Foundation,
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19 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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0
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20
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276
|
21 /* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. */
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22
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23 /* XEmacs frontend written by Ben Wing, Jareth Hein and Hrvoje Niksic. */
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0
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24
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276
|
25 #ifdef HAVE_CONFIG_H
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26 # include <config.h>
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27 #endif
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0
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28
|
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276
|
29 #include <sys/types.h>
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30 #include <string.h>
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31 #include <stdio.h>
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412
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32
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33 #if defined HAVE_LIMITS_H || _LIBC
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34 # include <limits.h>
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|
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35 #endif
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0
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36
|
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276
|
37 /* The following contortions are an attempt to use the C preprocessor
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|
38 to determine an unsigned integral type that is 32 bits wide. An
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39 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
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40 doing that would require that the configure script compile and *run*
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41 the resulting executable. Locally running cross-compiled executables
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42 is usually not possible. */
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0
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43
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276
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44 #ifdef _LIBC
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45 # include <sys/types.h>
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46 typedef u_int32_t md5_uint32;
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47 #else
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48 # if defined __STDC__ && __STDC__
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49 # define UINT_MAX_32_BITS 4294967295U
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|
|
50 # else
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|
|
51 # define UINT_MAX_32_BITS 0xFFFFFFFF
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|
|
52 # endif
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0
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53
|
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276
|
54 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
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55 This should be valid for all systems GNU cares about because
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56 that doesn't include 16-bit systems, and only modern systems
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|
57 (that certainly have <limits.h>) have 64+-bit integral types. */
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58
|
|
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59 # ifndef UINT_MAX
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60 # define UINT_MAX UINT_MAX_32_BITS
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|
|
61 # endif
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0
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62
|
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276
|
63 # if UINT_MAX == UINT_MAX_32_BITS
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64 typedef unsigned int md5_uint32;
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65 # else
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66 # if USHRT_MAX == UINT_MAX_32_BITS
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67 typedef unsigned short md5_uint32;
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68 # else
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69 # if ULONG_MAX == UINT_MAX_32_BITS
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70 typedef unsigned long md5_uint32;
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|
|
71 # else
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72 /* The following line is intended to evoke an error.
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73 Using #error is not portable enough. */
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|
74 "Cannot determine unsigned 32-bit data type."
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|
|
75 # endif
|
|
|
76 # endif
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|
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77 # endif
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78 #endif
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0
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79
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276
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80 #include "lisp.h"
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81 #include "buffer.h"
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82 #include "lstream.h"
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83 #ifdef FILE_CODING
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84 # include "file-coding.h"
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85 #endif
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0
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86
|
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276
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87 /* Structure to save state of computation between the single steps. */
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88 struct md5_ctx
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89 {
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90 md5_uint32 A;
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91 md5_uint32 B;
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92 md5_uint32 C;
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93 md5_uint32 D;
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94
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95 md5_uint32 total[2];
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96 md5_uint32 buflen;
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97 char buffer[128];
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0
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98 };
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99
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276
|
100 #ifdef WORDS_BIGENDIAN
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101 # define SWAP(n) \
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102 (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
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103 #else
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104 # define SWAP(n) (n)
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105 #endif
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0
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106
|
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276
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107
|
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108 /* This array contains the bytes used to pad the buffer to the next
|
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|
109 64-byte boundary. (RFC 1321, 3.1: Step 1) */
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110 static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
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111
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|
0
|
112
|
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412
|
113 static void md5_process_block (CONST void *, size_t, struct md5_ctx *);
|
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276
|
114
|
|
0
|
115
|
|
276
|
116 /* Initialize structure containing state of computation.
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117 (RFC 1321, 3.3: Step 3) */
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118 static void
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119 md5_init_ctx (struct md5_ctx *ctx)
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|
0
|
120 {
|
|
276
|
121 ctx->A = 0x67452301;
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122 ctx->B = 0xefcdab89;
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123 ctx->C = 0x98badcfe;
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124 ctx->D = 0x10325476;
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0
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125
|
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276
|
126 ctx->total[0] = ctx->total[1] = 0;
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|
|
127 ctx->buflen = 0;
|
|
0
|
128 }
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|
|
129
|
|
276
|
130 /* Put result from CTX in first 16 bytes following RESBUF. The result
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|
131 must be in little endian byte order.
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|
0
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132
|
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276
|
133 IMPORTANT: On some systems it is required that RESBUF is correctly
|
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|
134 aligned for a 32 bits value. */
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|
135 static void *
|
|
412
|
136 md5_read_ctx (CONST struct md5_ctx *ctx, void *resbuf)
|
|
276
|
137 {
|
|
|
138 ((md5_uint32 *) resbuf)[0] = SWAP (ctx->A);
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139 ((md5_uint32 *) resbuf)[1] = SWAP (ctx->B);
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140 ((md5_uint32 *) resbuf)[2] = SWAP (ctx->C);
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|
|
141 ((md5_uint32 *) resbuf)[3] = SWAP (ctx->D);
|
|
0
|
142
|
|
276
|
143 return resbuf;
|
|
0
|
144 }
|
|
|
145
|
|
276
|
146 /* Process the remaining bytes in the internal buffer and the usual
|
|
|
147 prolog according to the standard and write the result to RESBUF.
|
|
|
148
|
|
|
149 IMPORTANT: On some systems it is required that RESBUF is correctly
|
|
|
150 aligned for a 32 bits value. */
|
|
|
151 static void *
|
|
|
152 md5_finish_ctx (struct md5_ctx *ctx, void *resbuf)
|
|
0
|
153 {
|
|
276
|
154 /* Take yet unprocessed bytes into account. */
|
|
|
155 md5_uint32 bytes = ctx->buflen;
|
|
|
156 size_t pad;
|
|
0
|
157
|
|
276
|
158 /* Now count remaining bytes. */
|
|
|
159 ctx->total[0] += bytes;
|
|
|
160 if (ctx->total[0] < bytes)
|
|
|
161 ++ctx->total[1];
|
|
|
162
|
|
|
163 pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
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|
164 memcpy (&ctx->buffer[bytes], fillbuf, pad);
|
|
0
|
165
|
|
276
|
166 /* Put the 64-bit file length in *bits* at the end of the buffer. */
|
|
|
167 *(md5_uint32 *) &ctx->buffer[bytes + pad] = SWAP (ctx->total[0] << 3);
|
|
|
168 *(md5_uint32 *) &ctx->buffer[bytes + pad + 4] = SWAP ((ctx->total[1] << 3) |
|
|
|
169 (ctx->total[0] >> 29));
|
|
0
|
170
|
|
276
|
171 /* Process last bytes. */
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|
|
172 md5_process_block (ctx->buffer, bytes + pad + 8, ctx);
|
|
|
173
|
|
|
174 return md5_read_ctx (ctx, resbuf);
|
|
0
|
175 }
|
|
|
176
|
|
276
|
177 #ifndef emacs /* unused in Emacs */
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|
|
178 /* Compute MD5 message digest for bytes read from STREAM. The
|
|
|
179 resulting message digest number will be written into the 16 bytes
|
|
|
180 beginning at RESBLOCK. */
|
|
|
181 int
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|
|
182 md5_stream (FILE *stream, void *resblock)
|
|
0
|
183 {
|
|
276
|
184 /* Important: BLOCKSIZE must be a multiple of 64. */
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|
|
185 #define BLOCKSIZE 4096
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|
|
186 struct md5_ctx ctx;
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|
187 char buffer[BLOCKSIZE + 72];
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|
188 size_t sum;
|
|
0
|
189
|
|
276
|
190 /* Initialize the computation context. */
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|
191 md5_init_ctx (&ctx);
|
|
0
|
192
|
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276
|
193 /* Iterate over full file contents. */
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|
194 while (1)
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195 {
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196 /* We read the file in blocks of BLOCKSIZE bytes. One call of the
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197 computation function processes the whole buffer so that with the
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198 next round of the loop another block can be read. */
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199 size_t n;
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200 sum = 0;
|
|
0
|
201
|
|
276
|
202 /* Read block. Take care for partial reads. */
|
|
|
203 do
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|
|
204 {
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|
205 n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
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206
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207 sum += n;
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208 }
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|
209 while (sum < BLOCKSIZE && n != 0);
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|
210 if (n == 0 && ferror (stream))
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211 return 1;
|
|
0
|
212
|
|
276
|
213 /* If end of file is reached, end the loop. */
|
|
|
214 if (n == 0)
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|
215 break;
|
|
0
|
216
|
|
276
|
217 /* Process buffer with BLOCKSIZE bytes. Note that
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218 BLOCKSIZE % 64 == 0
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|
219 */
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|
|
220 md5_process_block (buffer, BLOCKSIZE, &ctx);
|
|
|
221 }
|
|
0
|
222
|
|
276
|
223 /* Add the last bytes if necessary. */
|
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|
224 if (sum > 0)
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|
225 md5_process_bytes (buffer, sum, &ctx);
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|
226
|
|
|
227 /* Construct result in desired memory. */
|
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228 md5_finish_ctx (&ctx, resblock);
|
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|
229 return 0;
|
|
0
|
230 }
|
|
|
231
|
|
276
|
232 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
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|
|
233 result is always in little endian byte order, so that a byte-wise
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|
234 output yields to the wanted ASCII representation of the message
|
|
|
235 digest. */
|
|
|
236 void *
|
|
|
237 md5_buffer (const char *buffer, size_t len, void *resblock)
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|
|
238 {
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|
|
239 struct md5_ctx ctx;
|
|
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240
|
|
|
241 /* Initialize the computation context. */
|
|
|
242 md5_init_ctx (&ctx);
|
|
|
243
|
|
|
244 /* Process whole buffer but last len % 64 bytes. */
|
|
|
245 md5_process_bytes (buffer, len, &ctx);
|
|
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246
|
|
|
247 /* Put result in desired memory area. */
|
|
|
248 return md5_finish_ctx (&ctx, resblock);
|
|
|
249 }
|
|
|
250 #endif /* not emacs */
|
|
|
251
|
|
|
252
|
|
0
|
253 static void
|
|
412
|
254 md5_process_bytes (CONST void *buffer, size_t len, struct md5_ctx *ctx)
|
|
0
|
255 {
|
|
276
|
256 /* When we already have some bits in our internal buffer concatenate
|
|
|
257 both inputs first. */
|
|
|
258 if (ctx->buflen != 0)
|
|
0
|
259 {
|
|
276
|
260 size_t left_over = ctx->buflen;
|
|
|
261 size_t add = 128 - left_over > len ? len : 128 - left_over;
|
|
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262
|
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263 memcpy (&ctx->buffer[left_over], buffer, add);
|
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264 ctx->buflen += add;
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|
|
265
|
|
|
266 if (left_over + add > 64)
|
|
|
267 {
|
|
|
268 md5_process_block (ctx->buffer, (left_over + add) & ~63, ctx);
|
|
|
269 /* The regions in the following copy operation cannot overlap. */
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|
270 memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63],
|
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|
271 (left_over + add) & 63);
|
|
|
272 ctx->buflen = (left_over + add) & 63;
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|
|
273 }
|
|
|
274
|
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275 buffer = (const char *) buffer + add;
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276 len -= add;
|
|
|
277 }
|
|
|
278
|
|
|
279 /* Process available complete blocks. */
|
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280 if (len > 64)
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|
281 {
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|
282 md5_process_block (buffer, len & ~63, ctx);
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283 buffer = (const char *) buffer + (len & ~63);
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284 len &= 63;
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|
285 }
|
|
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286
|
|
|
287 /* Move remaining bytes in internal buffer. */
|
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288 if (len > 0)
|
|
|
289 {
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|
|
290 memcpy (ctx->buffer, buffer, len);
|
|
|
291 ctx->buflen = len;
|
|
0
|
292 }
|
|
|
293 }
|
|
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294
|
|
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295
|
|
276
|
296 /* These are the four functions used in the four steps of the MD5 algorithm
|
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|
297 and defined in the RFC 1321. The first function is a little bit optimized
|
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|
298 (as found in Colin Plumbs public domain implementation). */
|
|
|
299 /* #define FF(b, c, d) ((b & c) | (~b & d)) */
|
|
|
300 #define FF(b, c, d) (d ^ (b & (c ^ d)))
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301 #define FG(b, c, d) FF (d, b, c)
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302 #define FH(b, c, d) (b ^ c ^ d)
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|
|
303 #define FI(b, c, d) (c ^ (b | ~d))
|
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0
|
304
|
|
276
|
305 /* Process LEN bytes of BUFFER, accumulating context into CTX.
|
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|
306 It is assumed that LEN % 64 == 0. */
|
|
0
|
307
|
|
|
308 static void
|
|
412
|
309 md5_process_block (CONST void *buffer, size_t len, struct md5_ctx *ctx)
|
|
0
|
310 {
|
|
276
|
311 md5_uint32 correct_words[16];
|
|
280
|
312 const md5_uint32 *words = (const md5_uint32 *) buffer;
|
|
276
|
313 size_t nwords = len / sizeof (md5_uint32);
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|
|
314 const md5_uint32 *endp = words + nwords;
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|
|
315 md5_uint32 A = ctx->A;
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|
316 md5_uint32 B = ctx->B;
|
|
|
317 md5_uint32 C = ctx->C;
|
|
|
318 md5_uint32 D = ctx->D;
|
|
|
319
|
|
|
320 /* First increment the byte count. RFC 1321 specifies the possible
|
|
|
321 length of the file up to 2^64 bits. Here we only compute the
|
|
|
322 number of bytes. Do a double word increment. */
|
|
|
323 ctx->total[0] += len;
|
|
|
324 if (ctx->total[0] < len)
|
|
|
325 ++ctx->total[1];
|
|
|
326
|
|
|
327 /* Process all bytes in the buffer with 64 bytes in each round of
|
|
|
328 the loop. */
|
|
|
329 while (words < endp)
|
|
|
330 {
|
|
|
331 md5_uint32 *cwp = correct_words;
|
|
|
332 md5_uint32 A_save = A;
|
|
|
333 md5_uint32 B_save = B;
|
|
|
334 md5_uint32 C_save = C;
|
|
|
335 md5_uint32 D_save = D;
|
|
|
336
|
|
|
337 /* First round: using the given function, the context and a constant
|
|
|
338 the next context is computed. Because the algorithms processing
|
|
|
339 unit is a 32-bit word and it is determined to work on words in
|
|
|
340 little endian byte order we perhaps have to change the byte order
|
|
|
341 before the computation. To reduce the work for the next steps
|
|
|
342 we store the swapped words in the array CORRECT_WORDS. */
|
|
|
343
|
|
|
344 #define OP(a, b, c, d, s, T) \
|
|
|
345 do \
|
|
|
346 { \
|
|
|
347 a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T; \
|
|
|
348 ++words; \
|
|
|
349 CYCLIC (a, s); \
|
|
|
350 a += b; \
|
|
|
351 } \
|
|
|
352 while (0)
|
|
|
353
|
|
|
354 /* It is unfortunate that C does not provide an operator for
|
|
|
355 cyclic rotation. Hope the C compiler is smart enough. */
|
|
|
356 #define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
|
|
|
357
|
|
|
358 /* Before we start, one word to the strange constants.
|
|
|
359 They are defined in RFC 1321 as
|
|
|
360
|
|
|
361 T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
|
|
|
362 */
|
|
|
363
|
|
|
364 /* Round 1. */
|
|
|
365 OP (A, B, C, D, 7, 0xd76aa478);
|
|
|
366 OP (D, A, B, C, 12, 0xe8c7b756);
|
|
|
367 OP (C, D, A, B, 17, 0x242070db);
|
|
|
368 OP (B, C, D, A, 22, 0xc1bdceee);
|
|
|
369 OP (A, B, C, D, 7, 0xf57c0faf);
|
|
|
370 OP (D, A, B, C, 12, 0x4787c62a);
|
|
|
371 OP (C, D, A, B, 17, 0xa8304613);
|
|
|
372 OP (B, C, D, A, 22, 0xfd469501);
|
|
|
373 OP (A, B, C, D, 7, 0x698098d8);
|
|
|
374 OP (D, A, B, C, 12, 0x8b44f7af);
|
|
|
375 OP (C, D, A, B, 17, 0xffff5bb1);
|
|
|
376 OP (B, C, D, A, 22, 0x895cd7be);
|
|
|
377 OP (A, B, C, D, 7, 0x6b901122);
|
|
|
378 OP (D, A, B, C, 12, 0xfd987193);
|
|
|
379 OP (C, D, A, B, 17, 0xa679438e);
|
|
|
380 OP (B, C, D, A, 22, 0x49b40821);
|
|
0
|
381
|
|
276
|
382 /* For the second to fourth round we have the possibly swapped words
|
|
|
383 in CORRECT_WORDS. Redefine the macro to take an additional first
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384 argument specifying the function to use. */
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385 #undef OP
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386 #define OP(f, a, b, c, d, k, s, T) \
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387 do \
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388 { \
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389 a += f (b, c, d) + correct_words[k] + T; \
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390 CYCLIC (a, s); \
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391 a += b; \
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392 } \
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393 while (0)
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394
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395 /* Round 2. */
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396 OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
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397 OP (FG, D, A, B, C, 6, 9, 0xc040b340);
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398 OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
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399 OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
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400 OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
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401 OP (FG, D, A, B, C, 10, 9, 0x02441453);
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402 OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
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403 OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
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404 OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
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405 OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
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406 OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
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407 OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
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408 OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
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409 OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
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410 OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
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411 OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
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412
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|
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413 /* Round 3. */
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414 OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
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415 OP (FH, D, A, B, C, 8, 11, 0x8771f681);
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416 OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
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417 OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
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418 OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
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419 OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
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420 OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
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421 OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
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422 OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
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423 OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
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424 OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
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425 OP (FH, B, C, D, A, 6, 23, 0x04881d05);
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426 OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
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|
|
427 OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
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|
|
428 OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
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|
|
429 OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
|
|
|
430
|
|
|
431 /* Round 4. */
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|
|
432 OP (FI, A, B, C, D, 0, 6, 0xf4292244);
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|
|
433 OP (FI, D, A, B, C, 7, 10, 0x432aff97);
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|
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434 OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
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|
|
435 OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
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|
|
436 OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
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|
|
437 OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
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|
|
438 OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
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|
|
439 OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
|
|
|
440 OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
|
|
|
441 OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
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|
|
442 OP (FI, C, D, A, B, 6, 15, 0xa3014314);
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|
|
443 OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
|
|
|
444 OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
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|
|
445 OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
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|
|
446 OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
|
|
|
447 OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
|
|
|
448
|
|
|
449 /* Add the starting values of the context. */
|
|
|
450 A += A_save;
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|
|
451 B += B_save;
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|
|
452 C += C_save;
|
|
|
453 D += D_save;
|
|
|
454 }
|
|
|
455
|
|
|
456 /* Put checksum in context given as argument. */
|
|
|
457 ctx->A = A;
|
|
|
458 ctx->B = B;
|
|
|
459 ctx->C = C;
|
|
|
460 ctx->D = D;
|
|
0
|
461 }
|
|
|
462
|
|
|
463
|
|
276
|
464 #ifdef emacs
|
|
|
465 #ifdef FILE_CODING
|
|
|
466 /* Find out what format the buffer will be saved in, so we can make
|
|
|
467 the digest based on what it will look like on disk. */
|
|
|
468 static Lisp_Object
|
|
|
469 md5_coding_system (Lisp_Object object, Lisp_Object coding, Lisp_Object istream,
|
|
|
470 int error_me_not)
|
|
0
|
471 {
|
|
276
|
472 Lisp_Object coding_system;
|
|
0
|
473
|
|
276
|
474 if (NILP (coding))
|
|
0
|
475 {
|
|
249
|
476 if (BUFFERP (object))
|
|
|
477 {
|
|
276
|
478 /* Use the file coding for this buffer by default. */
|
|
|
479 coding_system = XBUFFER (object)->buffer_file_coding_system;
|
|
249
|
480 }
|
|
|
481 else
|
|
|
482 {
|
|
276
|
483 /* Attempt to autodetect the coding of the string. This is
|
|
|
484 VERY hit-and-miss. */
|
|
412
|
485 enum eol_type eol = EOL_AUTODETECT;
|
|
276
|
486 coding_system = Fget_coding_system (Qundecided);
|
|
|
487 determine_real_coding_system (XLSTREAM (istream),
|
|
|
488 &coding_system, &eol);
|
|
249
|
489 }
|
|
276
|
490 if (NILP (coding_system))
|
|
|
491 coding_system = Fget_coding_system (Qbinary);
|
|
249
|
492 else
|
|
|
493 {
|
|
276
|
494 coding_system = Ffind_coding_system (coding_system);
|
|
|
495 if (NILP (coding_system))
|
|
|
496 coding_system = Fget_coding_system (Qbinary);
|
|
|
497 }
|
|
|
498 }
|
|
|
499 else
|
|
|
500 {
|
|
|
501 coding_system = Ffind_coding_system (coding);
|
|
|
502 if (NILP (coding_system))
|
|
|
503 {
|
|
|
504 if (error_me_not)
|
|
|
505 /* Default to binary. */
|
|
|
506 coding_system = Fget_coding_system (Qbinary);
|
|
|
507 else
|
|
|
508 signal_simple_error ("No such coding system", coding);
|
|
249
|
509 }
|
|
276
|
510 }
|
|
|
511 return coding_system;
|
|
|
512 }
|
|
|
513 #endif /* FILE_CODING */
|
|
|
514
|
|
|
515
|
|
|
516 DEFUN ("md5", Fmd5, 1, 5, 0, /*
|
|
|
517 Return the MD5 message digest of OBJECT, a buffer or string.
|
|
|
518
|
|
|
519 Optional arguments START and END denote positions for computing the
|
|
|
520 digest of a portion of OBJECT.
|
|
|
521
|
|
|
522 The optional CODING argument specifies the coding system the text is to be
|
|
|
523 represented in while computing the digest. If unspecified, it defaults
|
|
|
524 to the current format of the data, or is guessed.
|
|
|
525
|
|
|
526 If NOERROR is non-nil, silently assume binary coding if the guesswork
|
|
|
527 fails. Normally, an error is signaled in such case.
|
|
|
528
|
|
|
529 CODING and NOERROR arguments are meaningful only in XEmacsen with
|
|
|
530 file-coding or Mule support. Otherwise, they are ignored.
|
|
|
531 */
|
|
|
532 (object, start, end, coding, noerror))
|
|
|
533 {
|
|
|
534 /* This function can GC */
|
|
|
535 /* Can this really GC? How? */
|
|
|
536 struct md5_ctx ctx;
|
|
|
537 unsigned char digest[16];
|
|
|
538 unsigned char thehash[33];
|
|
|
539 int i;
|
|
|
540
|
|
|
541 Lisp_Object instream;
|
|
|
542 struct gcpro gcpro1;
|
|
|
543 #ifdef FILE_CODING
|
|
|
544 Lisp_Object raw_instream;
|
|
|
545 struct gcpro ngcpro1;
|
|
249
|
546 #endif
|
|
259
|
547
|
|
276
|
548 /* Set up the input stream. */
|
|
|
549 if (BUFFERP (object))
|
|
|
550 {
|
|
|
551 struct buffer *b;
|
|
|
552 Bufpos begv, endv;
|
|
|
553 CHECK_LIVE_BUFFER (object);
|
|
|
554 b = XBUFFER (object);
|
|
|
555 /* Figure out where we need to get info from */
|
|
|
556 get_buffer_range_char (b, start, end, &begv, &endv, GB_ALLOW_NIL);
|
|
|
557
|
|
|
558 instream = make_lisp_buffer_input_stream (b, begv, endv, 0);
|
|
|
559 }
|
|
|
560 else
|
|
|
561 {
|
|
|
562 Bytecount bstart, bend;
|
|
|
563 CHECK_STRING (object);
|
|
|
564 get_string_range_byte (object, start, end, &bstart, &bend,
|
|
|
565 GB_HISTORICAL_STRING_BEHAVIOR);
|
|
382
|
566 instream = make_lisp_string_input_stream (object, bstart, bend - bstart);
|
|
276
|
567 }
|
|
|
568 GCPRO1 (instream);
|
|
|
569
|
|
259
|
570 #ifdef FILE_CODING
|
|
276
|
571 /* Determine the coding and set up the conversion stream. */
|
|
|
572 coding = md5_coding_system (object, coding, instream, !NILP (noerror));
|
|
|
573 raw_instream = instream;
|
|
|
574 instream = make_encoding_input_stream (XLSTREAM (instream), coding);
|
|
|
575 NGCPRO1 (raw_instream);
|
|
249
|
576 #endif
|
|
|
577
|
|
276
|
578 /* Initialize MD5 context. */
|
|
|
579 md5_init_ctx (&ctx);
|
|
|
580
|
|
|
581 /* Get the data while doing the conversion. */
|
|
|
582 while (1)
|
|
|
583 {
|
|
|
584 Bufbyte tempbuf[1024]; /* some random amount */
|
|
412
|
585 int size_in_bytes = Lstream_read (XLSTREAM (instream),
|
|
|
586 tempbuf, sizeof (tempbuf));
|
|
276
|
587 if (!size_in_bytes)
|
|
|
588 break;
|
|
249
|
589
|
|
276
|
590 /* Process the bytes. */
|
|
|
591 md5_process_bytes (tempbuf, size_in_bytes, &ctx);
|
|
|
592 }
|
|
|
593 Lstream_delete (XLSTREAM (instream));
|
|
259
|
594 #ifdef FILE_CODING
|
|
276
|
595 Lstream_delete (XLSTREAM (raw_instream));
|
|
|
596 NUNGCPRO;
|
|
249
|
597 #endif
|
|
276
|
598 UNGCPRO;
|
|
249
|
599
|
|
276
|
600 md5_finish_ctx (&ctx, digest);
|
|
0
|
601 for (i = 0; i < 16; i++)
|
|
|
602 sprintf ((char *) (thehash + (i * 2)), "%02x", digest[i]);
|
|
|
603
|
|
276
|
604 return make_string (thehash, 32);
|
|
0
|
605 }
|
|
|
606
|
|
|
607 void
|
|
|
608 syms_of_md5 (void)
|
|
|
609 {
|
|
20
|
610 DEFSUBR (Fmd5);
|
|
0
|
611 }
|
|
|
612
|
|
|
613 void
|
|
|
614 vars_of_md5 (void)
|
|
|
615 {
|
|
276
|
616 Fprovide (intern ("md5"));
|
|
0
|
617 }
|
|
276
|
618 #endif /* emacs */
|
