checksum.c

   1 /*
   2  * Routines to support checksumming of bytes.
   3  *
   4  * Copyright (C) 1996 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2004-2022 Wayne Davison
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * In addition, as a special exception, the copyright holders give
  14  * permission to dynamically link rsync with the OpenSSL and xxhash
  15  * libraries when those libraries are being distributed in compliance
  16  * with their license terms, and to distribute a dynamically linked
  17  * combination of rsync and these libraries.  This is also considered
  18  * to be covered under the GPL's System Libraries exception.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License along
  26  * with this program; if not, visit the http://fsf.org website.
  27  */
  28
  29 #include "rsync.h"
  30
  31 #ifdef SUPPORT_XXHASH
  32 #include <xxhash.h>
  33 # if XXH_VERSION_NUMBER >= 800
  34 #  define SUPPORT_XXH3 1
  35 # endif
  36 #endif
  37
  38 extern int am_server;
  39 extern int whole_file;
  40 extern int checksum_seed;
  41 extern int protocol_version;
  42 extern int proper_seed_order;
  43 extern const char *checksum_choice;
  44
  45 #define NNI_BUILTIN (1<<0)
  46 #define NNI_EVP (1<<1)
  47 #define NNI_EVP_OK (1<<2)
  48
  49 struct name_num_item valid_checksums_items[] = {
  50 #ifdef SUPPORT_XXH3
  51         { CSUM_XXH3_128, 0, "xxh128", NULL },
  52         { CSUM_XXH3_64, 0, "xxh3", NULL },
  53 #endif
  54 #ifdef SUPPORT_XXHASH
  55         { CSUM_XXH64, 0, "xxh64", NULL },
  56         { CSUM_XXH64, 0, "xxhash", NULL },
  57 #endif
  58         { CSUM_MD5, NNI_BUILTIN|NNI_EVP, "md5", NULL },
  59         { CSUM_MD4, NNI_BUILTIN|NNI_EVP, "md4", NULL },
  60 #ifdef SHA_DIGEST_LENGTH
  61         { CSUM_SHA1, NNI_EVP, "sha1", NULL },
  62 #endif
  63 #ifdef SHA256_DIGEST_LENGTH
  64         { CSUM_SHA256, NNI_EVP, "sha256", NULL },
  65 #endif
  66 #ifdef SHA512_DIGEST_LENGTH
  67         { CSUM_SHA512, NNI_EVP, "sha512", NULL },
  68 #endif
  69         { CSUM_NONE, 0, "none", NULL },
  70         { 0, 0, NULL, NULL }
  71 };
  72
  73 struct name_num_obj valid_checksums = {
  74         "checksum", NULL, 0, 0, valid_checksums_items
  75 };
  76
  77 struct name_num_item valid_auth_checksums_items[] = {
  78 #ifdef SHA512_DIGEST_LENGTH
  79         { CSUM_SHA512, NNI_EVP, "sha512", NULL },
  80 #endif
  81 #ifdef SHA256_DIGEST_LENGTH
  82         { CSUM_SHA256, NNI_EVP, "sha256", NULL },
  83 #endif
  84 #ifdef SHA_DIGEST_LENGTH
  85         { CSUM_SHA1, NNI_EVP, "sha1", NULL },
  86 #endif
  87         { CSUM_MD5, NNI_BUILTIN|NNI_EVP, "md5", NULL },
  88         { CSUM_MD4, NNI_BUILTIN|NNI_EVP, "md4", NULL },
  89         { 0, 0, NULL, NULL }
  90 };
  91
  92 struct name_num_obj valid_auth_checksums = {
  93         "daemon auth checksum", NULL, 0, 0, valid_auth_checksums_items
  94 };
  95
  96 /* These cannot make use of openssl, so they're marked just as built-in */
  97 struct name_num_item implied_checksum_md4 =
  98     { CSUM_MD4, NNI_BUILTIN, "md4", NULL };
  99 struct name_num_item implied_checksum_md5 =
 100     { CSUM_MD5, NNI_BUILTIN, "md5", NULL };
 101
 102 struct name_num_item *xfer_sum_nni; /* used for the transfer checksum2 computations */
 103 const EVP_MD *xfer_sum_evp_md;
 104 int xfer_sum_len;
 105 struct name_num_item *file_sum_nni; /* used for the pre-transfer --checksum computations */
 106 const EVP_MD *file_sum_evp_md;
 107 int file_sum_len;
 108
 109 #ifdef USE_OPENSSL
 110 EVP_MD_CTX *ctx_evp = NULL;
 111 #endif
 112 static int initialized_choices = 0;
 113
 114 struct name_num_item *parse_csum_name(const char *name, int len)
 115 {
 116         struct name_num_item *nni;
 117
 118         if (len < 0 && name)
 119                 len = strlen(name);
 120
 121         init_checksum_choices();
 122
 123         if (!name || (len == 4 && strncasecmp(name, "auto", 4) == 0)) {
 124                 if (protocol_version >= 30) {
 125                         if (!proper_seed_order)
 126                                 return &implied_checksum_md5;
 127                         name = "md5";
 128                         len = 3;
 129                 } else {
 130                         if (protocol_version >= 27)
 131                                 implied_checksum_md4.num = CSUM_MD4_OLD;
 132                         else if (protocol_version >= 21)
 133                                 implied_checksum_md4.num = CSUM_MD4_BUSTED;
 134                         else
 135                                 implied_checksum_md4.num = CSUM_MD4_ARCHAIC;
 136                         return &implied_checksum_md4;
 137                 }
 138         }
 139
 140         nni = get_nni_by_name(&valid_checksums, name, len);
 141
 142         if (!nni) {
 143                 rprintf(FERROR, "unknown checksum name: %s\n", name);
 144                 exit_cleanup(RERR_UNSUPPORTED);
 145         }
 146
 147         return nni;
 148 }
 149
 150 static const EVP_MD *csum_evp_md(struct name_num_item *nni)
 151 {
 152 #ifdef USE_OPENSSL
 153         const EVP_MD *emd;
 154         if (!(nni->flags & NNI_EVP))
 155                 return NULL;
 156
 157 #ifdef USE_MD5_ASM
 158         if (nni->num == CSUM_MD5)
 159                 emd = NULL;
 160         else
 161 #endif
 162                 emd = EVP_get_digestbyname(nni->name);
 163         if (emd && !(nni->flags & NNI_EVP_OK)) { /* Make sure it works before we advertise it */
 164                 if (!ctx_evp && !(ctx_evp = EVP_MD_CTX_create()))
 165                         out_of_memory("csum_evp_md");
 166                 /* Some routines are marked as legacy and are not enabled in the openssl.cnf file.
 167                  * If we can't init the emd, we'll fall back to our built-in code. */
 168                 if (EVP_DigestInit_ex(ctx_evp, emd, NULL) == 0)
 169                         emd = NULL;
 170                 else
 171                         nni->flags = (nni->flags & ~NNI_BUILTIN) | NNI_EVP_OK;
 172         }
 173         if (!emd)
 174                 nni->flags &= ~NNI_EVP;
 175         return emd;
 176 #else
 177         return NULL;
 178 #endif
 179 }
 180
 181 void parse_checksum_choice(int final_call)
 182 {
 183         if (valid_checksums.negotiated_nni)
 184                 xfer_sum_nni = file_sum_nni = valid_checksums.negotiated_nni;
 185         else {
 186                 char *cp = checksum_choice ? strchr(checksum_choice, ',') : NULL;
 187                 if (cp) {
 188                         xfer_sum_nni = parse_csum_name(checksum_choice, cp - checksum_choice);
 189                         file_sum_nni = parse_csum_name(cp+1, -1);
 190                 } else
 191                         xfer_sum_nni = file_sum_nni = parse_csum_name(checksum_choice, -1);
 192                 if (am_server && checksum_choice)
 193                         validate_choice_vs_env(NSTR_CHECKSUM, xfer_sum_nni->num, file_sum_nni->num);
 194         }
 195         xfer_sum_len = csum_len_for_type(xfer_sum_nni->num, 0);
 196         file_sum_len = csum_len_for_type(file_sum_nni->num, 0);
 197         xfer_sum_evp_md = csum_evp_md(xfer_sum_nni);
 198         file_sum_evp_md = csum_evp_md(file_sum_nni);
 199
 200         if (xfer_sum_nni->num == CSUM_NONE)
 201                 whole_file = 1;
 202
 203         /* Snag the checksum name for both write_batch's option output & the following debug output. */
 204         if (valid_checksums.negotiated_nni)
 205                 checksum_choice = valid_checksums.negotiated_nni->name;
 206         else if (checksum_choice == NULL)
 207                 checksum_choice = xfer_sum_nni->name;
 208
 209         if (final_call && DEBUG_GTE(NSTR, am_server ? 3 : 1)) {
 210                 rprintf(FINFO, "%s%s checksum: %s\n",
 211                         am_server ? "Server" : "Client",
 212                         valid_checksums.negotiated_nni ? " negotiated" : "",
 213                         checksum_choice);
 214         }
 215 }
 216
 217 int csum_len_for_type(int cst, BOOL flist_csum)
 218 {
 219         switch (cst) {
 220           case CSUM_NONE:
 221                 return 1;
 222           case CSUM_MD4_ARCHAIC:
 223                 /* The oldest checksum code is rather weird: the file-list code only sent
 224                  * 2-byte checksums, but all other checksums were full MD4 length. */
 225                 return flist_csum ? 2 : MD4_DIGEST_LEN;
 226           case CSUM_MD4:
 227           case CSUM_MD4_OLD:
 228           case CSUM_MD4_BUSTED:
 229                 return MD4_DIGEST_LEN;
 230           case CSUM_MD5:
 231                 return MD5_DIGEST_LEN;
 232 #ifdef SHA_DIGEST_LENGTH
 233           case CSUM_SHA1:
 234                 return SHA_DIGEST_LENGTH;
 235 #endif
 236 #ifdef SHA256_DIGEST_LENGTH
 237           case CSUM_SHA256:
 238                 return SHA256_DIGEST_LENGTH;
 239 #endif
 240 #ifdef SHA512_DIGEST_LENGTH
 241           case CSUM_SHA512:
 242                 return SHA512_DIGEST_LENGTH;
 243 #endif
 244           case CSUM_XXH64:
 245           case CSUM_XXH3_64:
 246                 return 64/8;
 247           case CSUM_XXH3_128:
 248                 return 128/8;
 249           default: /* paranoia to prevent missing case values */
 250                 exit_cleanup(RERR_UNSUPPORTED);
 251         }
 252         return 0;
 253 }
 254
 255 /* Returns 0 if the checksum is not canonical (i.e. it includes a seed value).
 256  * Returns 1 if the public sum order matches our internal sum order.
 257  * Returns -1 if the public sum order is the reverse of our internal sum order.
 258  */
 259 int canonical_checksum(int csum_type)
 260 {
 261         switch (csum_type) {
 262           case CSUM_NONE:
 263           case CSUM_MD4_ARCHAIC:
 264           case CSUM_MD4_OLD:
 265           case CSUM_MD4_BUSTED:
 266                 break;
 267           case CSUM_MD4:
 268           case CSUM_MD5:
 269           case CSUM_SHA1:
 270           case CSUM_SHA256:
 271           case CSUM_SHA512:
 272                 return -1;
 273           case CSUM_XXH64:
 274           case CSUM_XXH3_64:
 275           case CSUM_XXH3_128:
 276                 return 1;
 277           default: /* paranoia to prevent missing case values */
 278                 exit_cleanup(RERR_UNSUPPORTED);
 279         }
 280         return 0;
 281 }
 282
 283 #ifndef USE_ROLL_SIMD /* See simd-checksum-*.cpp. */
 284 /*
 285   a simple 32 bit checksum that can be updated from either end
 286   (inspired by Mark Adler's Adler-32 checksum)
 287   */
 288 uint32 get_checksum1(char *buf1, int32 len)
 289 {
 290         int32 i;
 291         uint32 s1, s2;
 292         schar *buf = (schar *)buf1;
 293
 294         s1 = s2 = 0;
 295         for (i = 0; i < (len-4); i+=4) {
 296                 s2 += 4*(s1 + buf[i]) + 3*buf[i+1] + 2*buf[i+2] + buf[i+3] + 10*CHAR_OFFSET;
 297                 s1 += (buf[i+0] + buf[i+1] + buf[i+2] + buf[i+3] + 4*CHAR_OFFSET);
 298         }
 299         for (; i < len; i++) {
 300                 s1 += (buf[i]+CHAR_OFFSET); s2 += s1;
 301         }
 302         return (s1 & 0xffff) + (s2 << 16);
 303 }
 304 #endif
 305
 306 void get_checksum2(char *buf, int32 len, char *sum)
 307 {
 308 #ifdef USE_OPENSSL
 309         if (xfer_sum_evp_md) {
 310                 static EVP_MD_CTX *evp = NULL;
 311                 uchar seedbuf[4];
 312                 if (!evp && !(evp = EVP_MD_CTX_create()))
 313                         out_of_memory("get_checksum2");
 314                 EVP_DigestInit_ex(evp, xfer_sum_evp_md, NULL);
 315                 if (checksum_seed) {
 316                         SIVALu(seedbuf, 0, checksum_seed);
 317                         EVP_DigestUpdate(evp, seedbuf, 4);
 318                 }
 319                 EVP_DigestUpdate(evp, (uchar *)buf, len);
 320                 EVP_DigestFinal_ex(evp, (uchar *)sum, NULL);
 321         } else
 322 #endif
 323         switch (xfer_sum_nni->num) {
 324 #ifdef SUPPORT_XXHASH
 325           case CSUM_XXH64:
 326                 SIVAL64(sum, 0, XXH64(buf, len, checksum_seed));
 327                 break;
 328 #endif
 329 #ifdef SUPPORT_XXH3
 330           case CSUM_XXH3_64:
 331                 SIVAL64(sum, 0, XXH3_64bits_withSeed(buf, len, checksum_seed));
 332                 break;
 333           case CSUM_XXH3_128: {
 334                 XXH128_hash_t digest = XXH3_128bits_withSeed(buf, len, checksum_seed);
 335                 SIVAL64(sum, 0, digest.low64);
 336                 SIVAL64(sum, 8, digest.high64);
 337                 break;
 338           }
 339 #endif
 340           case CSUM_MD5: {
 341                 md_context m5;
 342                 uchar seedbuf[4];
 343                 md5_begin(&m5);
 344                 if (proper_seed_order) {
 345                         if (checksum_seed) {
 346                                 SIVALu(seedbuf, 0, checksum_seed);
 347                                 md5_update(&m5, seedbuf, 4);
 348                         }
 349                         md5_update(&m5, (uchar *)buf, len);
 350                 } else {
 351                         md5_update(&m5, (uchar *)buf, len);
 352                         if (checksum_seed) {
 353                                 SIVALu(seedbuf, 0, checksum_seed);
 354                                 md5_update(&m5, seedbuf, 4);
 355                         }
 356                 }
 357                 md5_result(&m5, (uchar *)sum);
 358                 break;
 359           }
 360           case CSUM_MD4:
 361           case CSUM_MD4_OLD:
 362           case CSUM_MD4_BUSTED:
 363           case CSUM_MD4_ARCHAIC: {
 364                 md_context m;
 365                 int32 i;
 366                 static char *buf1;
 367                 static int32 len1;
 368
 369                 mdfour_begin(&m);
 370
 371                 if (len > len1) {
 372                         if (buf1)
 373                                 free(buf1);
 374                         buf1 = new_array(char, len+4);
 375                         len1 = len;
 376                 }
 377
 378                 memcpy(buf1, buf, len);
 379                 if (checksum_seed) {
 380                         SIVAL(buf1,len,checksum_seed);
 381                         len += 4;
 382                 }
 383
 384                 for (i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK)
 385                         mdfour_update(&m, (uchar *)(buf1+i), CSUM_CHUNK);
 386
 387                 /*
 388                  * Prior to version 27 an incorrect MD4 checksum was computed
 389                  * by failing to call mdfour_tail() for block sizes that
 390                  * are multiples of 64.  This is fixed by calling mdfour_update()
 391                  * even when there are no more bytes.
 392                  */
 393                 if (len - i > 0 || xfer_sum_nni->num > CSUM_MD4_BUSTED)
 394                         mdfour_update(&m, (uchar *)(buf1+i), len-i);
 395
 396                 mdfour_result(&m, (uchar *)sum);
 397                 break;
 398           }
 399           default: /* paranoia to prevent missing case values */
 400                 exit_cleanup(RERR_UNSUPPORTED);
 401         }
 402 }
 403
 404 void file_checksum(const char *fname, const STRUCT_STAT *st_p, char *sum)
 405 {
 406         struct map_struct *buf;
 407         OFF_T i, len = st_p->st_size;
 408         int32 remainder;
 409         int fd;
 410
 411         fd = do_open(fname, O_RDONLY, 0);
 412         if (fd == -1) {
 413                 memset(sum, 0, file_sum_len);
 414                 return;
 415         }
 416
 417         buf = map_file(fd, len, MAX_MAP_SIZE, CHUNK_SIZE);
 418
 419 #ifdef USE_OPENSSL
 420         if (file_sum_evp_md) {
 421                 static EVP_MD_CTX *evp = NULL;
 422                 if (!evp && !(evp = EVP_MD_CTX_create()))
 423                         out_of_memory("file_checksum");
 424
 425                 EVP_DigestInit_ex(evp, file_sum_evp_md, NULL);
 426
 427                 for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
 428                         EVP_DigestUpdate(evp, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
 429
 430                 remainder = (int32)(len - i);
 431                 if (remainder > 0)
 432                         EVP_DigestUpdate(evp, (uchar *)map_ptr(buf, i, remainder), remainder);
 433
 434                 EVP_DigestFinal_ex(evp, (uchar *)sum, NULL);
 435         } else
 436 #endif
 437         switch (file_sum_nni->num) {
 438 #ifdef SUPPORT_XXHASH
 439           case CSUM_XXH64: {
 440                 static XXH64_state_t* state = NULL;
 441                 if (!state && !(state = XXH64_createState()))
 442                         out_of_memory("file_checksum");
 443
 444                 XXH64_reset(state, 0);
 445
 446                 for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
 447                         XXH64_update(state, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
 448
 449                 remainder = (int32)(len - i);
 450                 if (remainder > 0)
 451                         XXH64_update(state, (uchar *)map_ptr(buf, i, remainder), remainder);
 452
 453                 SIVAL64(sum, 0, XXH64_digest(state));
 454                 break;
 455           }
 456 #endif
 457 #ifdef SUPPORT_XXH3
 458           case CSUM_XXH3_64: {
 459                 static XXH3_state_t* state = NULL;
 460                 if (!state && !(state = XXH3_createState()))
 461                         out_of_memory("file_checksum");
 462
 463                 XXH3_64bits_reset(state);
 464
 465                 for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
 466                         XXH3_64bits_update(state, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
 467
 468                 remainder = (int32)(len - i);
 469                 if (remainder > 0)
 470                         XXH3_64bits_update(state, (uchar *)map_ptr(buf, i, remainder), remainder);
 471
 472                 SIVAL64(sum, 0, XXH3_64bits_digest(state));
 473                 break;
 474           }
 475           case CSUM_XXH3_128: {
 476                 XXH128_hash_t digest;
 477                 static XXH3_state_t* state = NULL;
 478                 if (!state && !(state = XXH3_createState()))
 479                         out_of_memory("file_checksum");
 480
 481                 XXH3_128bits_reset(state);
 482
 483                 for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
 484                         XXH3_128bits_update(state, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
 485
 486                 remainder = (int32)(len - i);
 487                 if (remainder > 0)
 488                         XXH3_128bits_update(state, (uchar *)map_ptr(buf, i, remainder), remainder);
 489
 490                 digest = XXH3_128bits_digest(state);
 491                 SIVAL64(sum, 0, digest.low64);
 492                 SIVAL64(sum, 8, digest.high64);
 493                 break;
 494           }
 495 #endif
 496           case CSUM_MD5: {
 497                 md_context m5;
 498
 499                 md5_begin(&m5);
 500
 501                 for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
 502                         md5_update(&m5, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
 503
 504                 remainder = (int32)(len - i);
 505                 if (remainder > 0)
 506                         md5_update(&m5, (uchar *)map_ptr(buf, i, remainder), remainder);
 507
 508                 md5_result(&m5, (uchar *)sum);
 509                 break;
 510           }
 511           case CSUM_MD4:
 512           case CSUM_MD4_OLD:
 513           case CSUM_MD4_BUSTED:
 514           case CSUM_MD4_ARCHAIC: {
 515                 md_context m;
 516
 517                 mdfour_begin(&m);
 518
 519                 for (i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK)
 520                         mdfour_update(&m, (uchar *)map_ptr(buf, i, CSUM_CHUNK), CSUM_CHUNK);
 521
 522                 /* Prior to version 27 an incorrect MD4 checksum was computed
 523                  * by failing to call mdfour_tail() for block sizes that
 524                  * are multiples of 64.  This is fixed by calling mdfour_update()
 525                  * even when there are no more bytes. */
 526                 remainder = (int32)(len - i);
 527                 if (remainder > 0 || file_sum_nni->num > CSUM_MD4_BUSTED)
 528                         mdfour_update(&m, (uchar *)map_ptr(buf, i, remainder), remainder);
 529
 530                 mdfour_result(&m, (uchar *)sum);
 531                 break;
 532           }
 533           default:
 534                 rprintf(FERROR, "Invalid checksum-choice for --checksum: %s (%d)\n",
 535                         file_sum_nni->name, file_sum_nni->num);
 536                 exit_cleanup(RERR_UNSUPPORTED);
 537         }
 538
 539         close(fd);
 540         unmap_file(buf);
 541 }
 542
 543 static int32 sumresidue;
 544 static md_context ctx_md;
 545 #ifdef SUPPORT_XXHASH
 546 static XXH64_state_t* xxh64_state;
 547 #endif
 548 #ifdef SUPPORT_XXH3
 549 static XXH3_state_t* xxh3_state;
 550 #endif
 551 static struct name_num_item *cur_sum_nni;
 552 static const EVP_MD *cur_sum_evp_md;
 553 int cur_sum_len;
 554
 555 int sum_init(struct name_num_item *nni, int seed)
 556 {
 557         char s[4];
 558
 559         if (!nni)
 560                 nni = parse_csum_name(NULL, 0);
 561         cur_sum_nni = nni;
 562         cur_sum_len = csum_len_for_type(nni->num, 0);
 563         cur_sum_evp_md = csum_evp_md(nni);
 564
 565 #ifdef USE_OPENSSL
 566         if (cur_sum_evp_md) {
 567                 if (!ctx_evp && !(ctx_evp = EVP_MD_CTX_create()))
 568                         out_of_memory("file_checksum");
 569                 EVP_DigestInit_ex(ctx_evp, cur_sum_evp_md, NULL);
 570         } else
 571 #endif
 572         switch (cur_sum_nni->num) {
 573 #ifdef SUPPORT_XXHASH
 574           case CSUM_XXH64:
 575                 if (!xxh64_state && !(xxh64_state = XXH64_createState()))
 576                         out_of_memory("sum_init");
 577                 XXH64_reset(xxh64_state, 0);
 578                 break;
 579 #endif
 580 #ifdef SUPPORT_XXH3
 581           case CSUM_XXH3_64:
 582                 if (!xxh3_state && !(xxh3_state = XXH3_createState()))
 583                         out_of_memory("sum_init");
 584                 XXH3_64bits_reset(xxh3_state);
 585                 break;
 586           case CSUM_XXH3_128:
 587                 if (!xxh3_state && !(xxh3_state = XXH3_createState()))
 588                         out_of_memory("sum_init");
 589                 XXH3_128bits_reset(xxh3_state);
 590                 break;
 591 #endif
 592           case CSUM_MD5:
 593                 md5_begin(&ctx_md);
 594                 break;
 595           case CSUM_MD4:
 596                 mdfour_begin(&ctx_md);
 597                 sumresidue = 0;
 598                 break;
 599           case CSUM_MD4_OLD:
 600           case CSUM_MD4_BUSTED:
 601           case CSUM_MD4_ARCHAIC:
 602                 mdfour_begin(&ctx_md);
 603                 sumresidue = 0;
 604                 SIVAL(s, 0, seed);
 605                 sum_update(s, 4);
 606                 break;
 607           case CSUM_NONE:
 608                 break;
 609           default: /* paranoia to prevent missing case values */
 610                 exit_cleanup(RERR_UNSUPPORTED);
 611         }
 612
 613         return cur_sum_len;
 614 }
 615
 616 /**
 617  * Feed data into an MD4 accumulator, md.  The results may be
 618  * retrieved using sum_end().  md is used for different purposes at
 619  * different points during execution.
 620  *
 621  * @todo Perhaps get rid of md and just pass in the address each time.
 622  * Very slightly clearer and slower.
 623  **/
 624 void sum_update(const char *p, int32 len)
 625 {
 626 #ifdef USE_OPENSSL
 627         if (cur_sum_evp_md) {
 628                 EVP_DigestUpdate(ctx_evp, (uchar *)p, len);
 629         } else
 630 #endif
 631         switch (cur_sum_nni->num) {
 632 #ifdef SUPPORT_XXHASH
 633           case CSUM_XXH64:
 634                 XXH64_update(xxh64_state, p, len);
 635                 break;
 636 #endif
 637 #ifdef SUPPORT_XXH3
 638           case CSUM_XXH3_64:
 639                 XXH3_64bits_update(xxh3_state, p, len);
 640                 break;
 641           case CSUM_XXH3_128:
 642                 XXH3_128bits_update(xxh3_state, p, len);
 643                 break;
 644 #endif
 645           case CSUM_MD5:
 646                 md5_update(&ctx_md, (uchar *)p, len);
 647                 break;
 648           case CSUM_MD4:
 649           case CSUM_MD4_OLD:
 650           case CSUM_MD4_BUSTED:
 651           case CSUM_MD4_ARCHAIC:
 652                 if (len + sumresidue < CSUM_CHUNK) {
 653                         memcpy(ctx_md.buffer + sumresidue, p, len);
 654                         sumresidue += len;
 655                         break;
 656                 }
 657
 658                 if (sumresidue) {
 659                         int32 i = CSUM_CHUNK - sumresidue;
 660                         memcpy(ctx_md.buffer + sumresidue, p, i);
 661                         mdfour_update(&ctx_md, (uchar *)ctx_md.buffer, CSUM_CHUNK);
 662                         len -= i;
 663                         p += i;
 664                 }
 665
 666                 while (len >= CSUM_CHUNK) {
 667                         mdfour_update(&ctx_md, (uchar *)p, CSUM_CHUNK);
 668                         len -= CSUM_CHUNK;
 669                         p += CSUM_CHUNK;
 670                 }
 671
 672                 sumresidue = len;
 673                 if (sumresidue)
 674                         memcpy(ctx_md.buffer, p, sumresidue);
 675                 break;
 676           case CSUM_NONE:
 677                 break;
 678           default: /* paranoia to prevent missing case values */
 679                 exit_cleanup(RERR_UNSUPPORTED);
 680         }
 681 }
 682
 683 /* The sum buffer only needs to be as long as the current checksum's digest
 684  * len, not MAX_DIGEST_LEN. Note that for CSUM_MD4_ARCHAIC that is the full
 685  * MD4_DIGEST_LEN even if the file-list code is going to ignore all but the
 686  * first 2 bytes of it. */
 687 void sum_end(char *sum)
 688 {
 689 #ifdef USE_OPENSSL
 690         if (cur_sum_evp_md) {
 691                 EVP_DigestFinal_ex(ctx_evp, (uchar *)sum, NULL);
 692         } else
 693 #endif
 694         switch (cur_sum_nni->num) {
 695 #ifdef SUPPORT_XXHASH
 696           case CSUM_XXH64:
 697                 SIVAL64(sum, 0, XXH64_digest(xxh64_state));
 698                 break;
 699 #endif
 700 #ifdef SUPPORT_XXH3
 701           case CSUM_XXH3_64:
 702                 SIVAL64(sum, 0, XXH3_64bits_digest(xxh3_state));
 703                 break;
 704           case CSUM_XXH3_128: {
 705                 XXH128_hash_t digest = XXH3_128bits_digest(xxh3_state);
 706                 SIVAL64(sum, 0, digest.low64);
 707                 SIVAL64(sum, 8, digest.high64);
 708                 break;
 709           }
 710 #endif
 711           case CSUM_MD5:
 712                 md5_result(&ctx_md, (uchar *)sum);
 713                 break;
 714           case CSUM_MD4:
 715           case CSUM_MD4_OLD:
 716                 mdfour_update(&ctx_md, (uchar *)ctx_md.buffer, sumresidue);
 717                 mdfour_result(&ctx_md, (uchar *)sum);
 718                 break;
 719           case CSUM_MD4_BUSTED:
 720           case CSUM_MD4_ARCHAIC:
 721                 if (sumresidue)
 722                         mdfour_update(&ctx_md, (uchar *)ctx_md.buffer, sumresidue);
 723                 mdfour_result(&ctx_md, (uchar *)sum);
 724                 break;
 725           case CSUM_NONE:
 726                 *sum = '\0';
 727                 break;
 728           default: /* paranoia to prevent missing case values */
 729                 exit_cleanup(RERR_UNSUPPORTED);
 730         }
 731 }
 732
 733 #if defined SUPPORT_XXH3 || defined USE_OPENSSL
 734 static void verify_digest(struct name_num_item *nni, BOOL check_auth_list)
 735 {
 736 #ifdef SUPPORT_XXH3
 737         static int xxh3_result = 0;
 738 #endif
 739 #ifdef USE_OPENSSL
 740         static int prior_num = 0, prior_flags = 0, prior_result = 0;
 741 #endif
 742
 743 #ifdef SUPPORT_XXH3
 744         if (nni->num == CSUM_XXH3_64 || nni->num == CSUM_XXH3_128) {
 745                 if (!xxh3_result) {
 746                         char buf[32816];
 747                         int j;
 748                         for (j = 0; j < (int)sizeof buf; j++)
 749                                 buf[j] = ' ' + (j % 96);
 750                         sum_init(nni, 0);
 751                         sum_update(buf, 32816);
 752                         sum_update(buf, 31152);
 753                         sum_update(buf, 32474);
 754                         sum_update(buf, 9322);
 755                         xxh3_result = XXH3_64bits_digest(xxh3_state) != 0xadbcf16d4678d1de ? -1 : 1;
 756                 }
 757                 if (xxh3_result < 0)
 758                         nni->num = CSUM_gone;
 759                 return;
 760         }
 761 #endif
 762
 763 #ifdef USE_OPENSSL
 764         if (BITS_SETnUNSET(nni->flags, NNI_EVP, NNI_BUILTIN|NNI_EVP_OK)) {
 765                 if (nni->num == prior_num && nni->flags == prior_flags) {
 766                         nni->flags = prior_result;
 767                         if (!(nni->flags & NNI_EVP))
 768                                 nni->num = CSUM_gone;
 769                 } else {
 770                         prior_num = nni->num;
 771                         prior_flags = nni->flags;
 772                         if (!csum_evp_md(nni))
 773                                 nni->num = CSUM_gone;
 774                         prior_result = nni->flags;
 775                         if (check_auth_list && (nni = get_nni_by_num(&valid_auth_checksums, prior_num)) != NULL)
 776                                 verify_digest(nni, False);
 777                 }
 778         }
 779 #endif
 780 }
 781 #endif
 782
 783 void init_checksum_choices()
 784 {
 785         struct name_num_item *nni;
 786
 787         if (initialized_choices)
 788                 return;
 789
 790 #if defined SUPPORT_XXH3 || defined USE_OPENSSL
 791         for (nni = valid_checksums.list; nni->name; nni++)
 792                 verify_digest(nni, True);
 793
 794         for (nni = valid_auth_checksums.list; nni->name; nni++)
 795                 verify_digest(nni, False);
 796 #endif
 797
 798         initialized_choices = 1;
 799 }