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00023 #include <config.h>
00024
00025 #include <stdlib.h>
00026
00027 #ifdef HAVE_STRING_H
00028 #include <string.h>
00029 #endif
00030
00031 #ifdef HAVE_SYS_TYPES_H
00032 #include <sys/types.h>
00033 #endif
00034
00035 #include "md5.h"
00036
00037
00038 #ifdef WORDS_BIGENDIAN
00039 # define SWAP(n) \
00040 (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
00041 #else
00042 # define SWAP(n) (n)
00043 #endif
00044
00045
00046
00047
00048 static const unsigned char fillbuf[64] = { 0x80, 0 };
00049
00050
00051
00052
00053 void
00054 md5_init_ctx (ctx)
00055 struct md5_ctx *ctx;
00056 {
00057 ctx->A = 0x67452301;
00058 ctx->B = 0xefcdab89;
00059 ctx->C = 0x98badcfe;
00060 ctx->D = 0x10325476;
00061
00062 ctx->total[0] = ctx->total[1] = 0;
00063 ctx->buflen = 0;
00064 }
00065
00066
00067
00068
00069
00070
00071 void *
00072 md5_read_ctx (ctx, resbuf)
00073 const struct md5_ctx *ctx;
00074 void *resbuf;
00075 {
00076 ((md5_uint32 *) resbuf)[0] = SWAP (ctx->A);
00077 ((md5_uint32 *) resbuf)[1] = SWAP (ctx->B);
00078 ((md5_uint32 *) resbuf)[2] = SWAP (ctx->C);
00079 ((md5_uint32 *) resbuf)[3] = SWAP (ctx->D);
00080
00081 return resbuf;
00082 }
00083
00084
00085
00086
00087
00088
00089 void *
00090 md5_finish_ctx (ctx, resbuf)
00091 struct md5_ctx *ctx;
00092 void *resbuf;
00093 {
00094
00095 md5_uint32 bytes = ctx->buflen;
00096 size_t pad;
00097
00098
00099 ctx->total[0] += bytes;
00100 if (ctx->total[0] < bytes)
00101 ++ctx->total[1];
00102
00103 pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
00104 memcpy (&ctx->buffer[bytes], fillbuf, pad);
00105
00106
00107 *(md5_uint32 *) &ctx->buffer[bytes + pad] = SWAP (ctx->total[0] << 3);
00108 *(md5_uint32 *) &ctx->buffer[bytes + pad + 4] = SWAP ((ctx->total[1] << 3) |
00109 (ctx->total[0] >> 29));
00110
00111
00112 md5_process_block (ctx->buffer, bytes + pad + 8, ctx);
00113
00114 return md5_read_ctx (ctx, resbuf);
00115 }
00116
00117
00118
00119
00120 int
00121 md5_stream (stream, resblock)
00122 FILE *stream;
00123 void *resblock;
00124 {
00125
00126 #define BLOCKSIZE 4096
00127 struct md5_ctx ctx;
00128 char buffer[BLOCKSIZE + 72];
00129 size_t sum;
00130
00131
00132 md5_init_ctx (&ctx);
00133
00134
00135 while (1)
00136 {
00137
00138
00139
00140 size_t n;
00141 sum = 0;
00142
00143
00144 do
00145 {
00146 n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
00147
00148 sum += n;
00149 }
00150 while (sum < BLOCKSIZE && n != 0);
00151 if (n == 0 && ferror (stream))
00152 return 1;
00153
00154
00155 if (n == 0)
00156 break;
00157
00158
00159
00160
00161 md5_process_block (buffer, BLOCKSIZE, &ctx);
00162 }
00163
00164
00165 if (sum > 0)
00166 md5_process_bytes (buffer, sum, &ctx);
00167
00168
00169 md5_finish_ctx (&ctx, resblock);
00170 return 0;
00171 }
00172
00173
00174
00175
00176
00177 void *
00178 md5_buffer (buffer, len, resblock)
00179 const char *buffer;
00180 size_t len;
00181 void *resblock;
00182 {
00183 struct md5_ctx ctx;
00184
00185
00186 md5_init_ctx (&ctx);
00187
00188
00189 md5_process_bytes (buffer, len, &ctx);
00190
00191
00192 return md5_finish_ctx (&ctx, resblock);
00193 }
00194
00195
00196 void
00197 md5_process_bytes (buffer, len, ctx)
00198 const void *buffer;
00199 size_t len;
00200 struct md5_ctx *ctx;
00201 {
00202
00203
00204 if (ctx->buflen != 0)
00205 {
00206 size_t left_over = ctx->buflen;
00207 size_t add = 128 - left_over > len ? len : 128 - left_over;
00208
00209 memcpy (&ctx->buffer[left_over], buffer, add);
00210 ctx->buflen += add;
00211
00212 if (left_over + add > 64)
00213 {
00214 md5_process_block (ctx->buffer, (left_over + add) & ~63, ctx);
00215
00216 memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63],
00217 (left_over + add) & 63);
00218 ctx->buflen = (left_over + add) & 63;
00219 }
00220
00221 buffer = (const char *) buffer + add;
00222 len -= add;
00223 }
00224
00225
00226 if (len > 64)
00227 {
00228 md5_process_block (buffer, len & ~63, ctx);
00229 buffer = (const char *) buffer + (len & ~63);
00230 len &= 63;
00231 }
00232
00233
00234 if (len > 0)
00235 {
00236 memcpy (ctx->buffer, buffer, len);
00237 ctx->buflen = len;
00238 }
00239 }
00240
00241
00242
00243
00244
00245
00246 #define FF(b, c, d) (d ^ (b & (c ^ d)))
00247 #define FG(b, c, d) FF (d, b, c)
00248 #define FH(b, c, d) (b ^ c ^ d)
00249 #define FI(b, c, d) (c ^ (b | ~d))
00250
00251
00252
00253
00254 void
00255 md5_process_block (buffer, len, ctx)
00256 const void *buffer;
00257 size_t len;
00258 struct md5_ctx *ctx;
00259 {
00260 md5_uint32 correct_words[16];
00261 const md5_uint32 *words = buffer;
00262 size_t nwords = len / sizeof (md5_uint32);
00263 const md5_uint32 *endp = words + nwords;
00264 md5_uint32 A = ctx->A;
00265 md5_uint32 B = ctx->B;
00266 md5_uint32 C = ctx->C;
00267 md5_uint32 D = ctx->D;
00268
00269
00270
00271
00272 ctx->total[0] += len;
00273 if (ctx->total[0] < len)
00274 ++ctx->total[1];
00275
00276
00277
00278 while (words < endp)
00279 {
00280 md5_uint32 *cwp = correct_words;
00281 md5_uint32 A_save = A;
00282 md5_uint32 B_save = B;
00283 md5_uint32 C_save = C;
00284 md5_uint32 D_save = D;
00285
00286
00287
00288
00289
00290
00291
00292
00293 #define OP(a, b, c, d, s, T) \
00294 do \
00295 { \
00296 a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T; \
00297 ++words; \
00298 CYCLIC (a, s); \
00299 a += b; \
00300 } \
00301 while (0)
00302
00303
00304
00305 #define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
00306
00307
00308
00309
00310
00311
00312
00313
00314 OP (A, B, C, D, 7, 0xd76aa478);
00315 OP (D, A, B, C, 12, 0xe8c7b756);
00316 OP (C, D, A, B, 17, 0x242070db);
00317 OP (B, C, D, A, 22, 0xc1bdceee);
00318 OP (A, B, C, D, 7, 0xf57c0faf);
00319 OP (D, A, B, C, 12, 0x4787c62a);
00320 OP (C, D, A, B, 17, 0xa8304613);
00321 OP (B, C, D, A, 22, 0xfd469501);
00322 OP (A, B, C, D, 7, 0x698098d8);
00323 OP (D, A, B, C, 12, 0x8b44f7af);
00324 OP (C, D, A, B, 17, 0xffff5bb1);
00325 OP (B, C, D, A, 22, 0x895cd7be);
00326 OP (A, B, C, D, 7, 0x6b901122);
00327 OP (D, A, B, C, 12, 0xfd987193);
00328 OP (C, D, A, B, 17, 0xa679438e);
00329 OP (B, C, D, A, 22, 0x49b40821);
00330
00331
00332
00333
00334 #undef OP
00335 #define OP(f, a, b, c, d, k, s, T) \
00336 do \
00337 { \
00338 a += f (b, c, d) + correct_words[k] + T; \
00339 CYCLIC (a, s); \
00340 a += b; \
00341 } \
00342 while (0)
00343
00344
00345 OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
00346 OP (FG, D, A, B, C, 6, 9, 0xc040b340);
00347 OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
00348 OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
00349 OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
00350 OP (FG, D, A, B, C, 10, 9, 0x02441453);
00351 OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
00352 OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
00353 OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
00354 OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
00355 OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
00356 OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
00357 OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
00358 OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
00359 OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
00360 OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
00361
00362
00363 OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
00364 OP (FH, D, A, B, C, 8, 11, 0x8771f681);
00365 OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
00366 OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
00367 OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
00368 OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
00369 OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
00370 OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
00371 OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
00372 OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
00373 OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
00374 OP (FH, B, C, D, A, 6, 23, 0x04881d05);
00375 OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
00376 OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
00377 OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
00378 OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
00379
00380
00381 OP (FI, A, B, C, D, 0, 6, 0xf4292244);
00382 OP (FI, D, A, B, C, 7, 10, 0x432aff97);
00383 OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
00384 OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
00385 OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
00386 OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
00387 OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
00388 OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
00389 OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
00390 OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
00391 OP (FI, C, D, A, B, 6, 15, 0xa3014314);
00392 OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
00393 OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
00394 OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
00395 OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
00396 OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
00397
00398
00399 A += A_save;
00400 B += B_save;
00401 C += C_save;
00402 D += D_save;
00403 }
00404
00405
00406 ctx->A = A;
00407 ctx->B = B;
00408 ctx->C = C;
00409 ctx->D = D;
00410 }