Mercurial > hg > xemacs-beta
annotate src/md5.c @ 5848:e2efee0f7703
hst confused
| author | Henry Thompson <ht@markup.co.uk> |
|---|---|
| date | Fri, 27 Feb 2015 17:43:50 +0000 |
| parents | 308d34e9f07d |
| children |
| rev | line source |
|---|---|
| 428 | 1 /* md5.c - Functions to compute MD5 message digest of files or memory blocks |
| 2 according to the definition of MD5 in RFC 1321 from April 1992. | |
| 3 Copyright (C) 1995, 1996 Free Software Foundation, Inc. | |
| 800 | 4 Copyright (C) 2001, 2002 Ben Wing. |
| 428 | 5 NOTE: The canonical source of this file is maintained with the GNU C |
| 6 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu. | |
| 7 | |
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8 This file is part of XEmacs. |
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9 |
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10 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 11 under the terms of the GNU General Public License as published by the |
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12 Free Software Foundation, either version 3 of the License, or (at your |
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13 option) any later version. |
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14 |
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15 XEmacs is distributed in the hope that it will be useful, but WITHOUT |
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16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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18 for more details. |
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19 |
| 428 | 20 You should have received a copy of the GNU General Public License |
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21 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 22 /* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. */ |
| 23 | |
| 24 /* XEmacs frontend written by Ben Wing, Jareth Hein and Hrvoje Niksic. */ | |
| 25 | |
| 26 #ifdef HAVE_CONFIG_H | |
| 27 # include <config.h> | |
| 28 #endif | |
| 29 | |
| 30 #include <sys/types.h> | |
| 31 #include <string.h> | |
| 32 #include <stdio.h> | |
| 442 | 33 #include <limits.h> |
| 428 | 34 |
| 35 /* The following contortions are an attempt to use the C preprocessor | |
| 36 to determine an unsigned integral type that is 32 bits wide. An | |
| 37 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but | |
| 38 doing that would require that the configure script compile and *run* | |
| 39 the resulting executable. Locally running cross-compiled executables | |
| 40 is usually not possible. */ | |
| 41 | |
| 42 #ifdef _LIBC | |
| 43 # include <sys/types.h> | |
| 44 typedef u_int32_t md5_uint32; | |
| 45 #else | |
| 46 # if defined __STDC__ && __STDC__ | |
| 47 # define UINT_MAX_32_BITS 4294967295U | |
| 48 # else | |
| 49 # define UINT_MAX_32_BITS 0xFFFFFFFF | |
| 50 # endif | |
| 51 | |
| 52 /* If UINT_MAX isn't defined, assume it's a 32-bit type. | |
| 53 This should be valid for all systems GNU cares about because | |
| 54 that doesn't include 16-bit systems, and only modern systems | |
| 55 (that certainly have <limits.h>) have 64+-bit integral types. */ | |
| 56 | |
| 57 # ifndef UINT_MAX | |
| 58 # define UINT_MAX UINT_MAX_32_BITS | |
| 59 # endif | |
| 60 | |
| 61 # if UINT_MAX == UINT_MAX_32_BITS | |
| 62 typedef unsigned int md5_uint32; | |
| 63 # else | |
| 64 # if USHRT_MAX == UINT_MAX_32_BITS | |
| 65 typedef unsigned short md5_uint32; | |
| 66 # else | |
| 67 # if ULONG_MAX == UINT_MAX_32_BITS | |
| 68 typedef unsigned long md5_uint32; | |
| 69 # else | |
| 70 /* The following line is intended to evoke an error. | |
| 71 Using #error is not portable enough. */ | |
| 72 "Cannot determine unsigned 32-bit data type." | |
| 73 # endif | |
| 74 # endif | |
| 75 # endif | |
| 76 #endif | |
| 77 | |
| 78 #include "lisp.h" | |
| 79 #include "buffer.h" | |
| 80 #include "lstream.h" | |
| 81 # include "file-coding.h" | |
| 82 | |
| 83 /* Structure to save state of computation between the single steps. */ | |
| 84 struct md5_ctx | |
| 85 { | |
| 86 md5_uint32 A; | |
| 87 md5_uint32 B; | |
| 88 md5_uint32 C; | |
| 89 md5_uint32 D; | |
| 90 | |
| 91 md5_uint32 total[2]; | |
| 92 md5_uint32 buflen; | |
| 93 char buffer[128]; | |
| 94 }; | |
| 95 | |
| 96 #ifdef WORDS_BIGENDIAN | |
| 97 # define SWAP(n) \ | |
| 98 (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24)) | |
| 99 #else | |
| 100 # define SWAP(n) (n) | |
| 101 #endif | |
| 102 | |
| 103 | |
| 104 /* This array contains the bytes used to pad the buffer to the next | |
| 105 64-byte boundary. (RFC 1321, 3.1: Step 1) */ | |
| 106 static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ }; | |
| 107 | |
| 108 | |
| 442 | 109 static void md5_process_block (const void *, size_t, struct md5_ctx *); |
| 428 | 110 |
| 111 | |
| 112 /* Initialize structure containing state of computation. | |
| 113 (RFC 1321, 3.3: Step 3) */ | |
| 114 static void | |
| 115 md5_init_ctx (struct md5_ctx *ctx) | |
| 116 { | |
| 117 ctx->A = 0x67452301; | |
| 118 ctx->B = 0xefcdab89; | |
| 119 ctx->C = 0x98badcfe; | |
| 120 ctx->D = 0x10325476; | |
| 121 | |
| 122 ctx->total[0] = ctx->total[1] = 0; | |
| 123 ctx->buflen = 0; | |
| 124 } | |
| 125 | |
| 126 /* Put result from CTX in first 16 bytes following RESBUF. The result | |
| 127 must be in little endian byte order. | |
| 128 | |
| 129 IMPORTANT: On some systems it is required that RESBUF is correctly | |
| 130 aligned for a 32 bits value. */ | |
| 131 static void * | |
| 442 | 132 md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) |
| 428 | 133 { |
| 134 ((md5_uint32 *) resbuf)[0] = SWAP (ctx->A); | |
| 135 ((md5_uint32 *) resbuf)[1] = SWAP (ctx->B); | |
| 136 ((md5_uint32 *) resbuf)[2] = SWAP (ctx->C); | |
| 137 ((md5_uint32 *) resbuf)[3] = SWAP (ctx->D); | |
| 138 | |
| 139 return resbuf; | |
| 140 } | |
| 141 | |
| 142 /* Process the remaining bytes in the internal buffer and the usual | |
| 143 prolog according to the standard and write the result to RESBUF. | |
| 144 | |
| 145 IMPORTANT: On some systems it is required that RESBUF is correctly | |
| 146 aligned for a 32 bits value. */ | |
| 147 static void * | |
| 148 md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) | |
| 149 { | |
| 150 /* Take yet unprocessed bytes into account. */ | |
| 151 md5_uint32 bytes = ctx->buflen; | |
| 152 size_t pad; | |
| 153 | |
| 154 /* Now count remaining bytes. */ | |
| 155 ctx->total[0] += bytes; | |
| 156 if (ctx->total[0] < bytes) | |
| 157 ++ctx->total[1]; | |
| 158 | |
| 159 pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes; | |
| 160 memcpy (&ctx->buffer[bytes], fillbuf, pad); | |
| 161 | |
| 162 /* Put the 64-bit file length in *bits* at the end of the buffer. */ | |
| 163 *(md5_uint32 *) &ctx->buffer[bytes + pad] = SWAP (ctx->total[0] << 3); | |
| 164 *(md5_uint32 *) &ctx->buffer[bytes + pad + 4] = SWAP ((ctx->total[1] << 3) | | |
| 165 (ctx->total[0] >> 29)); | |
| 166 | |
| 167 /* Process last bytes. */ | |
| 168 md5_process_block (ctx->buffer, bytes + pad + 8, ctx); | |
| 169 | |
| 170 return md5_read_ctx (ctx, resbuf); | |
| 171 } | |
| 172 | |
| 173 #ifndef emacs /* unused in Emacs */ | |
| 174 /* Compute MD5 message digest for bytes read from STREAM. The | |
| 175 resulting message digest number will be written into the 16 bytes | |
| 176 beginning at RESBLOCK. */ | |
| 177 int | |
| 178 md5_stream (FILE *stream, void *resblock) | |
| 179 { | |
| 180 /* Important: BLOCKSIZE must be a multiple of 64. */ | |
| 181 #define BLOCKSIZE 4096 | |
| 182 struct md5_ctx ctx; | |
| 183 char buffer[BLOCKSIZE + 72]; | |
| 184 size_t sum; | |
| 185 | |
| 186 /* Initialize the computation context. */ | |
| 187 md5_init_ctx (&ctx); | |
| 188 | |
| 189 /* Iterate over full file contents. */ | |
| 190 while (1) | |
| 191 { | |
| 192 /* We read the file in blocks of BLOCKSIZE bytes. One call of the | |
| 193 computation function processes the whole buffer so that with the | |
| 194 next round of the loop another block can be read. */ | |
| 195 size_t n; | |
| 196 sum = 0; | |
| 197 | |
| 198 /* Read block. Take care for partial reads. */ | |
| 199 do | |
| 200 { | |
| 771 | 201 n = retry_fread (buffer + sum, 1, BLOCKSIZE - sum, stream); |
| 428 | 202 |
| 203 sum += n; | |
| 204 } | |
| 205 while (sum < BLOCKSIZE && n != 0); | |
| 206 if (n == 0 && ferror (stream)) | |
| 207 return 1; | |
| 208 | |
| 209 /* If end of file is reached, end the loop. */ | |
| 210 if (n == 0) | |
| 211 break; | |
| 212 | |
| 213 /* Process buffer with BLOCKSIZE bytes. Note that | |
| 214 BLOCKSIZE % 64 == 0 | |
| 215 */ | |
| 216 md5_process_block (buffer, BLOCKSIZE, &ctx); | |
| 217 } | |
| 218 | |
| 219 /* Add the last bytes if necessary. */ | |
| 220 if (sum > 0) | |
| 221 md5_process_bytes (buffer, sum, &ctx); | |
| 222 | |
| 223 /* Construct result in desired memory. */ | |
| 224 md5_finish_ctx (&ctx, resblock); | |
| 225 return 0; | |
| 226 } | |
| 227 | |
| 228 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The | |
| 229 result is always in little endian byte order, so that a byte-wise | |
| 230 output yields to the wanted ASCII representation of the message | |
| 231 digest. */ | |
| 232 void * | |
| 233 md5_buffer (const char *buffer, size_t len, void *resblock) | |
| 234 { | |
| 235 struct md5_ctx ctx; | |
| 236 | |
| 237 /* Initialize the computation context. */ | |
| 238 md5_init_ctx (&ctx); | |
| 239 | |
| 240 /* Process whole buffer but last len % 64 bytes. */ | |
| 241 md5_process_bytes (buffer, len, &ctx); | |
| 242 | |
| 243 /* Put result in desired memory area. */ | |
| 244 return md5_finish_ctx (&ctx, resblock); | |
| 245 } | |
| 246 #endif /* not emacs */ | |
| 247 | |
| 248 | |
| 249 static void | |
| 442 | 250 md5_process_bytes (const void *buffer, size_t len, struct md5_ctx *ctx) |
| 428 | 251 { |
| 252 /* When we already have some bits in our internal buffer concatenate | |
| 253 both inputs first. */ | |
| 254 if (ctx->buflen != 0) | |
| 255 { | |
| 256 size_t left_over = ctx->buflen; | |
| 257 size_t add = 128 - left_over > len ? len : 128 - left_over; | |
| 258 | |
| 259 memcpy (&ctx->buffer[left_over], buffer, add); | |
| 260 ctx->buflen += add; | |
| 261 | |
| 262 if (left_over + add > 64) | |
| 263 { | |
| 264 md5_process_block (ctx->buffer, (left_over + add) & ~63, ctx); | |
| 265 /* The regions in the following copy operation cannot overlap. */ | |
| 266 memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63], | |
| 267 (left_over + add) & 63); | |
| 268 ctx->buflen = (left_over + add) & 63; | |
| 269 } | |
| 270 | |
| 271 buffer = (const char *) buffer + add; | |
| 272 len -= add; | |
| 273 } | |
| 274 | |
| 275 /* Process available complete blocks. */ | |
| 276 if (len > 64) | |
| 277 { | |
| 278 md5_process_block (buffer, len & ~63, ctx); | |
| 279 buffer = (const char *) buffer + (len & ~63); | |
| 280 len &= 63; | |
| 281 } | |
| 282 | |
| 283 /* Move remaining bytes in internal buffer. */ | |
| 284 if (len > 0) | |
| 285 { | |
| 286 memcpy (ctx->buffer, buffer, len); | |
| 287 ctx->buflen = len; | |
| 288 } | |
| 289 } | |
| 290 | |
| 291 | |
| 292 /* These are the four functions used in the four steps of the MD5 algorithm | |
| 293 and defined in the RFC 1321. The first function is a little bit optimized | |
| 294 (as found in Colin Plumbs public domain implementation). */ | |
| 295 /* #define FF(b, c, d) ((b & c) | (~b & d)) */ | |
| 296 #define FF(b, c, d) (d ^ (b & (c ^ d))) | |
| 297 #define FG(b, c, d) FF (d, b, c) | |
| 298 #define FH(b, c, d) (b ^ c ^ d) | |
| 299 #define FI(b, c, d) (c ^ (b | ~d)) | |
| 300 | |
| 301 /* Process LEN bytes of BUFFER, accumulating context into CTX. | |
| 302 It is assumed that LEN % 64 == 0. */ | |
| 303 | |
| 304 static void | |
| 442 | 305 md5_process_block (const void *buffer, size_t len, struct md5_ctx *ctx) |
| 428 | 306 { |
| 307 md5_uint32 correct_words[16]; | |
| 308 const md5_uint32 *words = (const md5_uint32 *) buffer; | |
| 309 size_t nwords = len / sizeof (md5_uint32); | |
| 310 const md5_uint32 *endp = words + nwords; | |
| 311 md5_uint32 A = ctx->A; | |
| 312 md5_uint32 B = ctx->B; | |
| 313 md5_uint32 C = ctx->C; | |
| 314 md5_uint32 D = ctx->D; | |
| 315 | |
| 316 /* First increment the byte count. RFC 1321 specifies the possible | |
| 317 length of the file up to 2^64 bits. Here we only compute the | |
| 318 number of bytes. Do a double word increment. */ | |
| 319 ctx->total[0] += len; | |
| 320 if (ctx->total[0] < len) | |
| 321 ++ctx->total[1]; | |
| 322 | |
| 323 /* Process all bytes in the buffer with 64 bytes in each round of | |
| 324 the loop. */ | |
| 325 while (words < endp) | |
| 326 { | |
| 327 md5_uint32 *cwp = correct_words; | |
| 328 md5_uint32 A_save = A; | |
| 329 md5_uint32 B_save = B; | |
| 330 md5_uint32 C_save = C; | |
| 331 md5_uint32 D_save = D; | |
| 332 | |
| 333 /* First round: using the given function, the context and a constant | |
| 334 the next context is computed. Because the algorithms processing | |
| 335 unit is a 32-bit word and it is determined to work on words in | |
| 336 little endian byte order we perhaps have to change the byte order | |
| 337 before the computation. To reduce the work for the next steps | |
| 338 we store the swapped words in the array CORRECT_WORDS. */ | |
| 339 | |
| 340 #define OP(a, b, c, d, s, T) \ | |
| 341 do \ | |
| 342 { \ | |
| 343 a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T; \ | |
| 344 ++words; \ | |
| 345 CYCLIC (a, s); \ | |
| 346 a += b; \ | |
| 347 } \ | |
| 348 while (0) | |
| 349 | |
| 350 /* It is unfortunate that C does not provide an operator for | |
| 351 cyclic rotation. Hope the C compiler is smart enough. */ | |
| 352 #define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s))) | |
| 353 | |
| 354 /* Before we start, one word to the strange constants. | |
| 355 They are defined in RFC 1321 as | |
| 356 | |
| 357 T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64 | |
| 358 */ | |
| 359 | |
| 360 /* Round 1. */ | |
| 361 OP (A, B, C, D, 7, 0xd76aa478); | |
| 362 OP (D, A, B, C, 12, 0xe8c7b756); | |
| 363 OP (C, D, A, B, 17, 0x242070db); | |
| 364 OP (B, C, D, A, 22, 0xc1bdceee); | |
| 365 OP (A, B, C, D, 7, 0xf57c0faf); | |
| 366 OP (D, A, B, C, 12, 0x4787c62a); | |
| 367 OP (C, D, A, B, 17, 0xa8304613); | |
| 368 OP (B, C, D, A, 22, 0xfd469501); | |
| 369 OP (A, B, C, D, 7, 0x698098d8); | |
| 370 OP (D, A, B, C, 12, 0x8b44f7af); | |
| 371 OP (C, D, A, B, 17, 0xffff5bb1); | |
| 372 OP (B, C, D, A, 22, 0x895cd7be); | |
| 373 OP (A, B, C, D, 7, 0x6b901122); | |
| 374 OP (D, A, B, C, 12, 0xfd987193); | |
| 375 OP (C, D, A, B, 17, 0xa679438e); | |
| 376 OP (B, C, D, A, 22, 0x49b40821); | |
| 377 | |
| 378 /* For the second to fourth round we have the possibly swapped words | |
| 379 in CORRECT_WORDS. Redefine the macro to take an additional first | |
| 380 argument specifying the function to use. */ | |
| 381 #undef OP | |
| 382 #define OP(f, a, b, c, d, k, s, T) \ | |
| 383 do \ | |
| 384 { \ | |
| 385 a += f (b, c, d) + correct_words[k] + T; \ | |
| 386 CYCLIC (a, s); \ | |
| 387 a += b; \ | |
| 388 } \ | |
| 389 while (0) | |
| 390 | |
| 391 /* Round 2. */ | |
| 392 OP (FG, A, B, C, D, 1, 5, 0xf61e2562); | |
| 393 OP (FG, D, A, B, C, 6, 9, 0xc040b340); | |
| 394 OP (FG, C, D, A, B, 11, 14, 0x265e5a51); | |
| 395 OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa); | |
| 396 OP (FG, A, B, C, D, 5, 5, 0xd62f105d); | |
| 397 OP (FG, D, A, B, C, 10, 9, 0x02441453); | |
| 398 OP (FG, C, D, A, B, 15, 14, 0xd8a1e681); | |
| 399 OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8); | |
| 400 OP (FG, A, B, C, D, 9, 5, 0x21e1cde6); | |
| 401 OP (FG, D, A, B, C, 14, 9, 0xc33707d6); | |
| 402 OP (FG, C, D, A, B, 3, 14, 0xf4d50d87); | |
| 403 OP (FG, B, C, D, A, 8, 20, 0x455a14ed); | |
| 404 OP (FG, A, B, C, D, 13, 5, 0xa9e3e905); | |
| 405 OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8); | |
| 406 OP (FG, C, D, A, B, 7, 14, 0x676f02d9); | |
| 407 OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a); | |
| 408 | |
| 409 /* Round 3. */ | |
| 410 OP (FH, A, B, C, D, 5, 4, 0xfffa3942); | |
| 411 OP (FH, D, A, B, C, 8, 11, 0x8771f681); | |
| 412 OP (FH, C, D, A, B, 11, 16, 0x6d9d6122); | |
| 413 OP (FH, B, C, D, A, 14, 23, 0xfde5380c); | |
| 414 OP (FH, A, B, C, D, 1, 4, 0xa4beea44); | |
| 415 OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9); | |
| 416 OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60); | |
| 417 OP (FH, B, C, D, A, 10, 23, 0xbebfbc70); | |
| 418 OP (FH, A, B, C, D, 13, 4, 0x289b7ec6); | |
| 419 OP (FH, D, A, B, C, 0, 11, 0xeaa127fa); | |
| 420 OP (FH, C, D, A, B, 3, 16, 0xd4ef3085); | |
| 421 OP (FH, B, C, D, A, 6, 23, 0x04881d05); | |
| 422 OP (FH, A, B, C, D, 9, 4, 0xd9d4d039); | |
| 423 OP (FH, D, A, B, C, 12, 11, 0xe6db99e5); | |
| 424 OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8); | |
| 425 OP (FH, B, C, D, A, 2, 23, 0xc4ac5665); | |
| 426 | |
| 427 /* Round 4. */ | |
| 428 OP (FI, A, B, C, D, 0, 6, 0xf4292244); | |
| 429 OP (FI, D, A, B, C, 7, 10, 0x432aff97); | |
| 430 OP (FI, C, D, A, B, 14, 15, 0xab9423a7); | |
| 431 OP (FI, B, C, D, A, 5, 21, 0xfc93a039); | |
| 432 OP (FI, A, B, C, D, 12, 6, 0x655b59c3); | |
| 433 OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92); | |
| 434 OP (FI, C, D, A, B, 10, 15, 0xffeff47d); | |
| 435 OP (FI, B, C, D, A, 1, 21, 0x85845dd1); | |
| 436 OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f); | |
| 437 OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0); | |
| 438 OP (FI, C, D, A, B, 6, 15, 0xa3014314); | |
| 439 OP (FI, B, C, D, A, 13, 21, 0x4e0811a1); | |
| 440 OP (FI, A, B, C, D, 4, 6, 0xf7537e82); | |
| 441 OP (FI, D, A, B, C, 11, 10, 0xbd3af235); | |
| 442 OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb); | |
| 443 OP (FI, B, C, D, A, 9, 21, 0xeb86d391); | |
| 444 | |
| 445 /* Add the starting values of the context. */ | |
| 446 A += A_save; | |
| 447 B += B_save; | |
| 448 C += C_save; | |
| 449 D += D_save; | |
| 450 } | |
| 451 | |
| 452 /* Put checksum in context given as argument. */ | |
| 453 ctx->A = A; | |
| 454 ctx->B = B; | |
| 455 ctx->C = C; | |
| 456 ctx->D = D; | |
| 457 } | |
| 458 | |
| 459 | |
| 460 #ifdef emacs | |
| 461 /* Find out what format the buffer will be saved in, so we can make | |
| 462 the digest based on what it will look like on disk. */ | |
| 463 static Lisp_Object | |
| 464 md5_coding_system (Lisp_Object object, Lisp_Object coding, Lisp_Object istream, | |
| 465 int error_me_not) | |
| 466 { | |
| 467 Lisp_Object coding_system; | |
| 468 | |
| 469 if (NILP (coding)) | |
| 470 { | |
| 471 if (BUFFERP (object)) | |
| 771 | 472 /* Use the file coding for this buffer by default. */ |
| 473 coding = XBUFFER (object)->buffer_file_coding_system; | |
| 428 | 474 else |
| 771 | 475 /* Attempt to autodetect the coding of the string. This is |
| 476 VERY hit-and-miss. #### It shouldn't be. */ | |
| 477 coding = detect_coding_stream (istream); | |
| 478 } | |
| 479 | |
| 480 if (error_me_not) | |
| 481 { | |
| 482 coding_system = find_coding_system_for_text_file (coding, 0); | |
| 483 if (NILP (coding_system)) | |
| 484 /* Default to binary. */ | |
| 428 | 485 coding_system = Fget_coding_system (Qbinary); |
| 486 } | |
| 487 else | |
| 771 | 488 coding_system = get_coding_system_for_text_file (coding, 0); |
| 489 | |
| 428 | 490 return coding_system; |
| 491 } | |
| 492 | |
| 493 DEFUN ("md5", Fmd5, 1, 5, 0, /* | |
| 494 Return the MD5 message digest of OBJECT, a buffer or string. | |
| 495 | |
| 496 Optional arguments START and END denote positions for computing the | |
| 497 digest of a portion of OBJECT. | |
| 498 | |
| 499 The optional CODING argument specifies the coding system the text is to be | |
| 500 represented in while computing the digest. If unspecified, it defaults | |
| 501 to the current format of the data, or is guessed. | |
| 502 | |
| 503 If NOERROR is non-nil, silently assume binary coding if the guesswork | |
| 504 fails. Normally, an error is signaled in such case. | |
| 505 | |
| 506 CODING and NOERROR arguments are meaningful only in XEmacsen with | |
| 507 file-coding or Mule support. Otherwise, they are ignored. | |
| 508 */ | |
| 509 (object, start, end, coding, noerror)) | |
| 510 { | |
| 511 /* This function can GC */ | |
| 512 /* Can this really GC? How? */ | |
| 513 struct md5_ctx ctx; | |
| 514 unsigned char digest[16]; | |
| 515 unsigned char thehash[33]; | |
| 516 int i; | |
| 517 | |
| 800 | 518 Lisp_Object raw_instream = Qnil, instream = Qnil; |
| 519 struct gcpro gcpro1, gcpro2; | |
| 428 | 520 |
| 800 | 521 GCPRO2 (raw_instream, instream); |
| 428 | 522 /* Set up the input stream. */ |
| 523 if (BUFFERP (object)) | |
| 524 { | |
| 525 struct buffer *b; | |
| 665 | 526 Charbpos begv, endv; |
| 428 | 527 CHECK_LIVE_BUFFER (object); |
| 528 b = XBUFFER (object); | |
| 529 /* Figure out where we need to get info from */ | |
| 530 get_buffer_range_char (b, start, end, &begv, &endv, GB_ALLOW_NIL); | |
| 531 | |
| 800 | 532 raw_instream = make_lisp_buffer_input_stream (b, begv, endv, 0); |
| 428 | 533 } |
| 534 else | |
| 535 { | |
| 536 Bytecount bstart, bend; | |
| 537 CHECK_STRING (object); | |
| 538 get_string_range_byte (object, start, end, &bstart, &bend, | |
| 539 GB_HISTORICAL_STRING_BEHAVIOR); | |
| 800 | 540 raw_instream = make_lisp_string_input_stream (object, bstart, |
| 541 bend - bstart); | |
| 428 | 542 } |
| 543 | |
| 544 /* Determine the coding and set up the conversion stream. */ | |
| 800 | 545 coding = md5_coding_system (object, coding, raw_instream, !NILP (noerror)); |
| 546 Lstream_rewind (XLSTREAM (raw_instream)); | |
| 547 instream = make_coding_input_stream (XLSTREAM (raw_instream), coding, | |
| 548 CODING_ENCODE, 0); | |
| 428 | 549 |
| 550 /* Initialize MD5 context. */ | |
| 551 md5_init_ctx (&ctx); | |
| 552 | |
| 553 /* Get the data while doing the conversion. */ | |
| 554 while (1) | |
| 555 { | |
| 867 | 556 Ibyte tempbuf[1024]; /* some random amount */ |
| 665 | 557 Bytecount size_in_bytes = |
| 428 | 558 Lstream_read (XLSTREAM (instream), tempbuf, sizeof (tempbuf)); |
| 3462 | 559 if (size_in_bytes <= 0) |
| 428 | 560 break; |
| 561 | |
| 562 /* Process the bytes. */ | |
| 563 md5_process_bytes (tempbuf, size_in_bytes, &ctx); | |
| 564 } | |
| 565 Lstream_delete (XLSTREAM (instream)); | |
| 566 Lstream_delete (XLSTREAM (raw_instream)); | |
| 567 UNGCPRO; | |
| 568 | |
| 569 md5_finish_ctx (&ctx, digest); | |
| 570 for (i = 0; i < 16; i++) | |
| 571 sprintf ((char *) (thehash + (i * 2)), "%02x", digest[i]); | |
| 572 | |
| 573 return make_string (thehash, 32); | |
| 574 } | |
| 575 | |
| 576 void | |
| 577 syms_of_md5 (void) | |
| 578 { | |
| 579 DEFSUBR (Fmd5); | |
| 580 } | |
| 581 | |
| 582 void | |
| 583 vars_of_md5 (void) | |
| 584 { | |
| 585 Fprovide (intern ("md5")); | |
| 586 } | |
| 587 #endif /* emacs */ |