tfcrypt.c

   1 /*
   2  * tfcrypt -- high security Threefish encryption tool.
   3  *
   4  * tfcrypt is copyrighted:
   5  * Copyright (C) 2012-2018 Andrey Rys. All rights reserved.
   6  *
   7  * tfcrypt is licensed to you under the terms of std. MIT/X11 license:
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining
  10  * a copy of this software and associated documentation files (the
  11  * "Software"), to deal in the Software without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sublicense, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be
  18  * included in all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  23  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  24  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  25  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  26  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29 #include "tfcrypt.h"
  30
  31 static int getps_filter(struct getpasswd_state *getps, char chr, size_t pos)
  32 {
  33         if (chr == '\x03') {
  34                 getps->retn = ((size_t)-2);
  35                 return 6;
  36         }
  37         return 1;
  38 }
  39
  40 static int getps_hex_filter(struct getpasswd_state *getps, char chr, size_t pos)
  41 {
  42         if (chr == '\x03') {
  43                 getps->retn = ((size_t)-2);
  44                 return 6;
  45         }
  46         if (chr >= '0' && chr <= '9') return 1;
  47         if (chr >= 'a' && chr <= 'f') return 1;
  48         if (chr >= 'A' && chr <= 'F') return 1;
  49         if (chr == '\x7f' || chr == '\x08'
  50         || chr == '\x15' || chr == '\x17') return 1;
  51         return 0;
  52 }
  53
  54 int main(int argc, char **argv)
  55 {
  56         int c;
  57         double td;
  58         char *s, *d, *t, *stoi;
  59         size_t x, n;
  60
  61         progname = basename(argv[0]);
  62
  63         if (!isatty(2)) do_statline_dynamic = NO;
  64
  65         s = (char *)srcblk;
  66         d = getenv("HOME");
  67         if (!d) d = "";
  68         n = PATH_MAX > sizeof(srcblk) ? sizeof(srcblk) : PATH_MAX;
  69         if (xstrlcpy(s, d, n) >= n) goto _baddfname;
  70         if (xstrlcat(s, "/.tfcrypt.defs", n) >= n) goto _baddfname;
  71         read_defaults(s, YES);
  72 _baddfname:
  73         memset(s, 0, n);
  74
  75         opterr = 0;
  76         while ((c = getopt(argc, argv, "L:s:aU:C:r:K:t:Pkzxc:l:qedn:vV:pwE:O:S:AmM:R:Z:WHD:")) != -1) {
  77                 switch (c) {
  78                         case 'L':
  79                                 read_defaults(optarg, NO);
  80                                 break;
  81                         case 's':
  82                                 saltf = optarg;
  83                                 break;
  84                         case 'r':
  85                                 randsource = optarg;
  86                                 break;
  87                         case 'c':
  88                                 if (!strcasecmp(optarg, "show"))
  89                                         counter_opt = TFC_CTR_SHOW;
  90                                 else if (!strcasecmp(optarg, "head"))
  91                                         counter_opt = TFC_CTR_HEAD;
  92                                 else if (!strcasecmp(optarg, "rand"))
  93                                         counter_opt = TFC_CTR_RAND;
  94                                 else if (!strcasecmp(optarg, "zero"))
  95                                         counter_opt = TFC_CTR_ZERO;
  96                                 else counter_file = sksum_hashlist_file = optarg;
  97                                 break;
  98                         case 'C':
  99                                 if (!strcasecmp(optarg, "ctr"))
 100                                         ctr_mode = TFC_MODE_CTR;
 101                                 else if (!strcasecmp(optarg, "stream"))
 102                                         ctr_mode = TFC_MODE_STREAM;
 103                                 else if (!strcasecmp(optarg, "cbc"))
 104                                         ctr_mode = TFC_MODE_CBC;
 105                                 else if (!strcasecmp(optarg, "ecb"))
 106                                         ctr_mode = TFC_MODE_ECB;
 107                                 else if (!strcasecmp(optarg, "xts"))
 108                                         ctr_mode = TFC_MODE_XTS;
 109                                 else if (!strcasecmp(optarg, "ocb"))
 110                                         ctr_mode = TFC_MODE_OCB;
 111                                 else xerror(NO, YES, YES, "%s: invalid mode of operation", optarg);
 112                                 break;
 113                         case 'P':
 114                                 do_edcrypt = TFC_DO_PLAIN;
 115                                 password = YES;
 116                                 ctr_mode = TFC_MODE_PLAIN;
 117                                 break;
 118                         case 'e':
 119                                 do_edcrypt = TFC_DO_ENCRYPT;
 120                                 break;
 121                         case 'd':
 122                                 do_edcrypt = TFC_DO_DECRYPT;
 123                                 break;
 124                         case 'D':
 125                                 macbits = strtoul(optarg, &stoi, 10);
 126                                 if (macbits == 0 || !str_empty(stoi) || macbits < 8
 127                                 || macbits > TF_MAX_BITS || macbits % 8)
 128                                         xerror(NO, YES, YES, "%s: invalid MAC bits setting", optarg);
 129                                 break;
 130                         case 'n':
 131                                 nr_turns = sksum_turns = strtoul(optarg, &stoi, 10);
 132                                 if (!str_empty(stoi)) xerror(NO, YES, YES, "%s: invalid number of turns", optarg);
 133                                 break;
 134                         case 'U':
 135                                 if (!strcasecmp(optarg, "key"))
 136                                         mackey_opt = TFC_MACKEY_RAWKEY;
 137                                 else if (!strcasecmp(optarg, "pwd"))
 138                                         mackey_opt = TFC_MACKEY_PASSWORD;
 139                                 else {
 140                                         mackey_opt = TFC_MACKEY_FILE;
 141                                         mackeyf = optarg;
 142                                 }
 143                                 break;
 144                         case 'p':
 145                                 password = YES;
 146                                 break;
 147                         case 'k':
 148                                 rawkey = TFC_RAWKEY_KEYFILE;
 149                                 break;
 150                         case 'z':
 151                                 rawkey = TFC_RAWKEY_ASKSTR;
 152                                 break;
 153                         case 'x':
 154                                 rawkey = TFC_RAWKEY_ASKHEX;
 155                                 break;
 156                         case 'K':
 157                                 verbose = YES;
 158                                 genkeyf = optarg;
 159                                 break;
 160                         case 't':
 161                                 tweakf = optarg;
 162                                 do_full_key = NO;
 163                                 break;
 164                         case 'l':
 165                                 if (maxlen != NOFSIZE) break;
 166
 167                                 maxlen = tfc_humanfsize(optarg, &stoi);
 168                                 if (!str_empty(stoi)) {
 169                                         maxlen = tfc_fnamesize(optarg, YES);
 170                                         maxlen = tfc_modifysize(maxlen, strchr(optarg, ':'));
 171                                         if (maxlen == NOFSIZE) xerror(NO, YES, YES,
 172                                         "%s: invalid count value", optarg);
 173                                 }
 174                                 else maxlen = tfc_modifysize(maxlen, strchr(optarg, ':'));
 175                                 if (counter_opt == TFC_CTR_HEAD)
 176                                         maxlen += TF_BLOCK_SIZE;
 177                                 break;
 178                         case 'w':
 179                                 overwrite_source = YES;
 180                                 break;
 181                         case 'E':
 182                                 if (!strcmp(optarg, "xall")) {
 183                                         catch_all_errors = YES;
 184                                         break;
 185                                 }
 186                                 if (!strcmp(optarg, "xseek")) {
 187                                         ignore_seek_errors = YES;
 188                                         break;
 189                                 }
 190                                 if (!strcmp(optarg, "exit"))
 191                                         error_action = TFC_ERRACT_EXIT;
 192                                 else if (!strncmp(optarg, "cont", 4))
 193                                         error_action = TFC_ERRACT_CONT;
 194                                 else if (!strcmp(optarg, "sync"))
 195                                         error_action = TFC_ERRACT_SYNC;
 196                                 else if (!strcmp(optarg, "lsync"))
 197                                         error_action = TFC_ERRACT_LSYNC;
 198                                 else xerror(NO, YES, YES, "invalid error action %s specified", optarg);
 199                                 break;
 200                         case 'O':
 201                                 s = d = optarg; t = NULL;
 202                                 while ((s = strtok_r(d, ",", &t))) {
 203                                         if (d) d = NULL;
 204                                         if (!strcmp(s, "sync"))
 205                                                 write_flags |= O_SYNC;
 206                                         else if (!strcmp(s, "trunc"))
 207                                                 write_flags |= O_TRUNC;
 208                                         else if (!strcmp(s, "fsync"))
 209                                                 do_fsync = YES;
 210                                         else if (!strcmp(s, "pad"))
 211                                                 do_pad = YES;
 212                                         else if (!strcmp(s, "xtime"))
 213                                                 do_preserve_time = YES;
 214                                         else if (!strcmp(s, "gibsize"))
 215                                                 do_stats_in_gibs = YES;
 216                                         else if (!strcmp(s, "plainstats"))
 217                                                 do_statline_dynamic = NO;
 218                                         else if (!strcmp(s, "statless"))
 219                                                 do_less_stats = YES;
 220                                         else if (!strcmp(s, "norepeat"))
 221                                                 no_repeat = YES;
 222                                         else if (!strncmp(s, "prompt", 6) && *(s+6) == '=')
 223                                                 pw_prompt = s+7;
 224                                         else if (!strncmp(s, "macprompt", 9) && *(s+9) == '=')
 225                                                 mac_pw_prompt = s+10;
 226                                         else if (!strcmp(s, "shorthex"))
 227                                                 do_full_hexdump = NO;
 228                                         else if (!strcmp(s, "fullkey"))
 229                                                 do_full_key = YES;
 230                                         else if (!strncmp(s, "iobs", 4) && *(s+4) == '=') {
 231                                                 s += 5;
 232                                                 blksize = (size_t)tfc_humanfsize(s, &stoi);
 233                                                 if (!str_empty(stoi)) {
 234                                                         blksize = (size_t)tfc_fnamesize(s, YES);
 235                                                         blksize = (size_t)tfc_modifysize((tfc_fsize)blksize, strchr(s, ':'));
 236                                                         if (blksize == NOSIZE) xerror(NO, YES, YES,
 237                                                         "%s: invalid block size value", s);
 238                                                 }
 239                                                 else blksize = (size_t)tfc_modifysize((tfc_fsize)blksize, strchr(s, ':'));
 240                                                 if (blksize < TF_BLOCK_SIZE) xerror(NO, YES, YES,
 241                                                         "%s: block size is lesser than TF_BLOCK_SIZE (%u bytes)", s, TFC_U(TF_BLOCK_SIZE));
 242                                                 if (blksize > TFC_BLKSIZE) xerror(NO, YES, YES,
 243                                                         "%s: block size exceeds %u bytes",
 244                                                         s, TFC_U(TFC_BLKSIZE));
 245                                         }
 246                                         else if (!strncmp(s, "xtsblocks", 9) && *(s+9) == '=') {
 247                                                 s += 10;
 248                                                 xtsblocks = (size_t)tfc_humanfsize(s, &stoi);
 249                                                 if (!str_empty(stoi)) {
 250                                                         xtsblocks = (size_t)tfc_fnamesize(s, YES);
 251                                                         xtsblocks = (size_t)tfc_modifysize((tfc_fsize)xtsblocks, strchr(s, ':'));
 252                                                         if (xtsblocks == NOSIZE) xerror(NO, YES, YES,
 253                                                         "%s: invalid blocks per xts block value", s);
 254                                                 }
 255                                                 else xtsblocks = (size_t)tfc_modifysize((tfc_fsize)xtsblocks, strchr(s, ':'));
 256                                                 if (TFC_BLKSIZE % xtsblocks) xerror(NO, YES, YES,
 257                                                         "%s: nr of blocks per xts block is not round to %u bytes",
 258                                                         s, TFC_U(TFC_BLKSIZE));
 259                                                 if ((xtsblocks * TF_BLOCK_SIZE) > TFC_BLKSIZE) xerror(NO, YES, YES,
 260                                                         "%s: nr of blocks per xts block exceeds %u bytes",
 261                                                         s, TFC_U(TFC_BLKSIZE));
 262                                         }
 263                                         else if (!strncmp(s, "iseek", 5) && *(s+5) == '=') {
 264                                                 s += 6;
 265                                                 iseek = tfc_humanfsize(s, &stoi);
 266                                                 if (!str_empty(stoi)) {
 267                                                         iseek = tfc_fnamesize(s, YES);
 268                                                         iseek = tfc_modifysize(iseek, strchr(s, ':'));
 269                                                         if (iseek == NOFSIZE) xerror(NO, YES, YES,
 270                                                         "%s: invalid iseek value", s);
 271                                                 }
 272                                                 else iseek = tfc_modifysize(iseek, strchr(s, ':'));
 273                                                 if (ctr_mode != TFC_MODE_PLAIN && iseek % TF_BLOCK_SIZE)
 274                                                         xerror(NO, YES, YES,
 275                                                                 "%s: not round to TF block size "
 276                                                                 "of %u bytes",
 277                                                                 s, TFC_U(TF_BLOCK_SIZE));
 278                                                 iseek_blocks = iseek / TF_BLOCK_SIZE;
 279                                         }
 280                                         else if (!strncmp(s, "ixseek", 6) && *(s+6) == '=') {
 281                                                 s += 7;
 282                                                 iseek = tfc_humanfsize(s, &stoi);
 283                                                 if (!str_empty(stoi)) {
 284                                                         iseek = tfc_fnamesize(s, YES);
 285                                                         iseek = tfc_modifysize(iseek, strchr(s, ':'));
 286                                                         if (iseek == NOFSIZE) xerror(NO, YES, YES,
 287                                                                 "%s: invalid ixseek value", s);
 288                                                 }
 289                                                 else iseek = tfc_modifysize(iseek, strchr(s, ':'));
 290                                         }
 291                                         else if (!strncmp(s, "ictr", 4) && *(s+4) == '=') {
 292                                                 s += 5;
 293                                                 iseek_blocks = tfc_humanfsize(s, &stoi);
 294                                                 if (!str_empty(stoi)) {
 295                                                         iseek_blocks = tfc_fnamesize(s, YES);
 296                                                         if (iseek_blocks == NOFSIZE)
 297                                                                 xerror(NO, YES, YES,
 298                                                                 "%s: invalid ictr value", s);
 299                                                         iseek_blocks /= TF_BLOCK_SIZE;
 300                                                         iseek_blocks = tfc_modifysize(iseek_blocks, strchr(s, ':'));
 301                                                 }
 302                                                 else iseek_blocks = tfc_modifysize(iseek_blocks, strchr(s, ':'));
 303                                         }
 304                                         else if (!strncmp(s, "ixctr", 5) && *(s+5) == '=') {
 305                                                 s += 6;
 306                                                 iseek_blocks = tfc_humanfsize(s, &stoi);
 307                                                 if (!str_empty(stoi)) {
 308                                                         iseek_blocks = tfc_fnamesize(s, YES);
 309                                                         iseek_blocks = tfc_modifysize(iseek_blocks, strchr(s, ':'));
 310                                                         if (iseek_blocks == NOFSIZE)
 311                                                                 xerror(NO, YES, YES,
 312                                                                 "%s: invalid ixctr value", s);
 313                                                 }
 314                                                 else iseek_blocks = tfc_modifysize(iseek_blocks, strchr(s, ':'));
 315                                                 if (iseek_blocks % TF_BLOCK_SIZE)
 316                                                         xerror(NO, YES, YES,
 317                                                         "%s: not round to TF block size "
 318                                                         "of %u bytes", s, TFC_U(TF_BLOCK_SIZE));
 319                                                 iseek_blocks /= TF_BLOCK_SIZE;
 320                                         }
 321                                         else if (!strncmp(s, "oseek", 5) && *(s+5) == '=') {
 322                                                 s += 6;
 323                                                 oseek = tfc_humanfsize(s, &stoi);
 324                                                 if (!str_empty(stoi)) {
 325                                                         oseek = tfc_fnamesize(s, YES);
 326                                                         oseek = tfc_modifysize(oseek, strchr(s, ':'));
 327                                                         if (oseek == NOFSIZE) xerror(NO, YES, YES,
 328                                                         "%s: invalid oseek value", s);
 329                                                 }
 330                                                 else oseek = tfc_modifysize(oseek, strchr(s, ':'));
 331                                         }
 332                                         else if (!strncmp(s, "count", 5) && *(s+5) == '=') {
 333                                                 s += 6;
 334                                                 maxlen = tfc_humanfsize(s, &stoi);
 335                                                 if (!str_empty(stoi)) {
 336                                                         maxlen = tfc_fnamesize(s, YES);
 337                                                         maxlen = tfc_modifysize(maxlen, strchr(s, ':'));
 338                                                         if (maxlen == NOFSIZE) xerror(NO, YES, YES,
 339                                                         "%s: invalid count value", s);
 340                                                 }
 341                                                 else maxlen = tfc_modifysize(maxlen, strchr(s, ':'));
 342                                                 if (counter_opt == TFC_CTR_HEAD)
 343                                                         maxlen += TF_BLOCK_SIZE;
 344                                         }
 345                                         else if (!strncmp(s, "xkey", 4) && *(s+4) == '=') {
 346                                                 s += 5;
 347                                                 maxkeylen = tfc_humanfsize(s, &stoi);
 348                                                 if (!str_empty(stoi)) {
 349                                                         maxkeylen = tfc_fnamesize(s, YES);
 350                                                         maxkeylen = tfc_modifysize(maxkeylen, strchr(s, ':'));
 351                                                         if (maxkeylen == NOSIZE)
 352                                                                 xerror(NO, YES, YES,
 353                                                                 "%s: invalid key length value", s);
 354                                                 }
 355                                                 else maxkeylen = tfc_modifysize(maxkeylen, strchr(s, ':'));
 356                                         }
 357                                         else if (!strncmp(s, "okey", 4) && *(s+4) == '=') {
 358                                                 s += 5;
 359                                                 keyoffset = tfc_humanfsize(s, &stoi);
 360                                                 if (!str_empty(stoi)) {
 361                                                         keyoffset = tfc_fnamesize(s, YES);
 362                                                         keyoffset = tfc_modifysize(keyoffset, strchr(s, ':'));
 363                                                         if (keyoffset == NOFSIZE)
 364                                                                 xerror(NO, YES, YES,
 365                                                                 "%s: invalid key offset value", s);
 366                                                 }
 367                                                 else keyoffset = tfc_modifysize(keyoffset, strchr(s, ':'));
 368                                         }
 369                                         else if (!strncmp(s, "xctr", 4) && *(s+4) == '=') {
 370                                                 s += 5;
 371                                                 ctrsz = tfc_humanfsize(s, &stoi);
 372                                                 if (!str_empty(stoi)) {
 373                                                         ctrsz = (size_t)tfc_fnamesize(s, YES);
 374                                                         ctrsz = (size_t)tfc_modifysize((tfc_fsize)ctrsz, strchr(s, ':'));
 375                                                         if (ctrsz == NOSIZE)
 376                                                                 xerror(NO, YES, YES,
 377                                                                 "%s: invalid counter length value", s);
 378                                                 }
 379                                                 else ctrsz = (size_t)tfc_modifysize((tfc_fsize)ctrsz, strchr(s, ':'));
 380                                                 if (ctrsz > TF_BLOCK_SIZE)
 381                                                         xerror(NO, YES, YES, "%s: counter size cannot exceed TF block size", s);
 382                                         }
 383                                         else xerror(NO, YES, YES, "invalid option %s", s);
 384                                 }
 385                                 break;
 386                         case 'S':
 387                                 do_mac = TFC_MAC_SIGN;
 388                                 if (strcasecmp(optarg, "mac") != 0)
 389                                         do_mac_file = optarg;
 390                                 break;
 391                         case 'M':
 392                                 do_mac = TFC_MAC_VRFY;
 393                                 if (!strcasecmp(optarg, "drop"))
 394                                         do_mac = TFC_MAC_DROP;
 395                                 else if (strcasecmp(optarg, "mac") != 0)
 396                                         do_mac_file = optarg;
 397                                 break;
 398                         case 'm':
 399                                 if (do_mac != TFC_MAC_VRFY)
 400                                         xerror(NO, YES, YES, "signature source was not specified");
 401                                 do_mac = TFC_MAC_JUST_VRFY;
 402                                 break;
 403                         case 'R':
 404                         case 'Z':
 405                                 if (maxlen != NOFSIZE) {
 406                                         if (c == 'Z') genzero_nr_bytes = maxlen;
 407                                         else genrandom_nr_bytes = maxlen;
 408                                 }
 409                                 else {
 410                                         tfc_fsize t;
 411                                         if (!strcasecmp(optarg, "cbs"))
 412                                                 t = TF_BLOCK_SIZE;
 413                                         else if (!strcasecmp(optarg, "ks"))
 414                                                 t = TF_FROM_BITS(TFC_KEY_BITS);
 415                                         else if (!strcasecmp(optarg, "xks"))
 416                                                 t = TF_FROM_BITS(TFC_KEY_BITS) * 2;
 417                                         else if (!strcasecmp(optarg, "iobs"))
 418                                                 t = blksize;
 419                                         else {
 420                                                 t = tfc_humanfsize(optarg, &stoi);
 421                                                 if (!str_empty(stoi)) {
 422                                                         t = tfc_fnamesize(optarg, NO);
 423                                                         t = tfc_modifysize(t, strchr(optarg, ':'));
 424                                                 }
 425                                                 else t = tfc_modifysize(t, strchr(optarg, ':'));
 426                                         }
 427                                         if (c == 'Z') genzero_nr_bytes = maxlen = t;
 428                                         else genrandom_nr_bytes = maxlen = t;
 429                                 }
 430                                 break;
 431                         case 'a':
 432                                 do_preserve_time = YES;
 433                                 break;
 434                         case 'A':
 435                                 do_outfmt = TFC_OUTFMT_B64;
 436                                 break;
 437                         case 'W':
 438                                 do_outfmt = TFC_OUTFMT_RAW;
 439                                 break;
 440                         case 'H':
 441                                 do_outfmt = TFC_OUTFMT_HEX;
 442                                 break;
 443                         case 'q':
 444                                 quiet = YES;
 445                                 verbose = NO;
 446                                 status_timer = 0;
 447                                 break;
 448                         case 'v':
 449                                 verbose = YES;
 450                                 break;
 451                         case 'V':
 452                                 td = strtod(optarg, &stoi);
 453                                 status_timer = TFC_DTOUSECS(td);
 454                                 if (status_timer <= TFC_DTOUSECS(0) || !str_empty(stoi)) status_timer = 0;
 455                                 break;
 456                         default:
 457                                 usage();
 458                                 break;
 459                 }
 460         }
 461
 462         if (!strcmp(progname, "tfbench")) {
 463                 if (!*(argv+optind)) usage();
 464
 465                 td = strtod(*(argv+optind), &stoi);
 466                 if (td <= TFC_DTOUSECS(0) || !str_empty(stoi))
 467                         xerror(NO, YES, YES,
 468                         "%s: invalid benchmark time in seconds", *(argv+optind));
 469                 bench_timer = TFC_DTOUSECS(td);
 470                 do_benchmark(bench_timer, td);
 471         }
 472         if (genrandom_nr_bytes) {
 473                 ctr_mode = TFC_MODE_STREAM;
 474                 do_edcrypt = TFC_DO_ENCRYPT;
 475                 gen_write_bytes(*(argv+optind), oseek, genrandom_nr_bytes);
 476         }
 477         if (genzero_nr_bytes) {
 478                 ctr_mode = TFC_MODE_PLAIN;
 479                 do_edcrypt = TFC_DO_PLAIN;
 480                 gen_write_bytes(*(argv+optind), oseek, genzero_nr_bytes);
 481         }
 482
 483         if (rawkey && password)
 484                 xerror(NO, YES, YES, "Cannot use rawkey and hashing password!");
 485         if (do_edcrypt == TFC_DO_ENCRYPT && do_mac >= TFC_MAC_VRFY)
 486                 xerror(NO, YES, YES, "Cannot encrypt and verify signature!");
 487         if (do_edcrypt == TFC_DO_DECRYPT && do_mac == TFC_MAC_SIGN)
 488                 xerror(NO, YES, YES, "Cannot decrypt and calculate signature!");
 489         if (do_edcrypt == TFC_DO_DECRYPT && counter_opt == TFC_CTR_RAND)
 490                 xerror(NO, YES, YES, "Cannot decrypt and embed a generated CTR into file!");
 491         if (do_edcrypt == TFC_DO_ENCRYPT && counter_opt == TFC_CTR_HEAD)
 492                 xerror(NO, YES, YES, "Cannot encrypt and read CTR from source!");
 493         if (overwrite_source && counter_opt == TFC_CTR_RAND)
 494                 xerror(NO, YES, YES, "Cannot embed a CTR into file when overwriting it!");
 495         if (ctr_mode == TFC_MODE_PLAIN
 496         && (do_edcrypt || do_mac || rawkey
 497         || mackey_opt || counter_opt || counter_file))
 498                 xerror(NO, YES, YES, "Encryption facility is disabled when in plain IO mode.");
 499
 500         errno = 0;
 501         do_stop = NO;
 502
 503         if (saltf) {
 504                 int saltfd;
 505
 506                 memset(tfc_salt, 0, TFC_MAX_SALT);
 507                 tfc_saltsz = 0;
 508                 if (!strcasecmp(saltf, "disable")) goto _nosalt;
 509
 510                 if (!strcmp(saltf, "-")) saltfd = 0;
 511                 else saltfd = open(saltf, O_RDONLY | O_LARGEFILE);
 512                 if (saltfd == -1) xerror(NO, NO, YES, "%s", saltf);
 513                 lio = xread(saltfd, tfc_salt, TFC_MAX_SALT - TF_FROM_BITS(TFC_KEY_BITS));
 514                 if (lio == NOSIZE) xerror(NO, NO, YES, "%s", saltf);
 515                 tfc_saltsz = lio;
 516                 xclose(saltfd);
 517         }
 518
 519 _nosalt:
 520         if (mackey_opt == TFC_MACKEY_FILE && mackeyf) {
 521                 int mkfd = -1;
 522                 tfc_yesno do_stop;
 523
 524                 if (!strcmp(mackeyf, "-")) mkfd = 0;
 525                 else mkfd = open(mackeyf, O_RDONLY | O_LARGEFILE);
 526                 if (mkfd == -1) xerror(NO, NO, YES, "%s", mackeyf);
 527
 528                 skein_init(&sk, TFC_KEY_BITS);
 529
 530                 do_stop = NO;
 531                 while (1) {
 532                         if (do_stop) break;
 533                         pblk = tmpdata;
 534                         ldone = 0;
 535                         lrem = lblock = sizeof(tmpdata);
 536                         if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(mkfd);
 537 _mkragain:              lio = xread(mkfd, pblk, lrem);
 538                         if (lio == 0) do_stop = YES;
 539                         if (lio != NOSIZE) ldone += lio;
 540                         else {
 541                                 if (errno != EIO && catch_all_errors != YES)
 542                                         xerror(NO, NO, NO, "%s", mackeyf);
 543                                 switch (error_action) {
 544                                         case TFC_ERRACT_CONT: xerror(YES, NO, NO, "%s", mackeyf); goto _mkragain; break;
 545                                         case TFC_ERRACT_SYNC:
 546                                         case TFC_ERRACT_LSYNC:
 547                                                 xerror(YES, NO, NO, "%s", mackeyf);
 548                                                 lio = ldone = lrem = lblock;
 549                                                 memset(tmpdata, 0, lio);
 550                                                 if (rdpos == NOFSIZE) lseek(mkfd, lio, SEEK_CUR);
 551                                                 else lseek(mkfd, rdpos + lio, SEEK_SET);
 552                                                 break;
 553                                         default: xerror(NO, NO, NO, "%s", mackeyf); break;
 554                                 }
 555                         }
 556                         if (lio && lio < lrem) {
 557                                 pblk += lio;
 558                                 lrem -= lio;
 559                                 goto _mkragain;
 560                         }
 561
 562                         skein_update(&sk, tmpdata, ldone);
 563                 }
 564
 565                 skein_final(mackey, &sk);
 566
 567                 xclose(mkfd);
 568         }
 569         else if (mackey_opt == TFC_MACKEY_PASSWORD) {
 570                 memset(&getps, 0, sizeof(struct getpasswd_state));
 571                 getps.fd = getps.efd = -1;
 572                 getps.passwd = pwdask;
 573                 getps.pwlen = sizeof(pwdask)-1;
 574                 getps.echo = mac_pw_prompt ? mac_pw_prompt : "Enter MAC password: ";
 575                 getps.charfilter = getps_filter;
 576                 getps.maskchar = 'x';
 577                 getps.flags = GETP_WAITFILL;
 578                 n = xgetpasswd(&getps);
 579                 if (n == NOSIZE) xerror(NO, NO, YES, "getting MAC password");
 580                 if (n == ((size_t)-2)) xexit(1);
 581                 skein(mackey, TF_MAX_BITS, NULL, pwdask, n);
 582                 if (verbose) {
 583                         skein(tmpdata, TF_MAX_BITS, NULL, mackey, TF_FROM_BITS(TF_MAX_BITS));
 584                         xor_shrink(tmpdata+TF_FROM_BITS(TF_MAX_BITS), TF_SIZE_UNIT, tmpdata, TF_FROM_BITS(TF_MAX_BITS));
 585                         tfc_nfsay(stderr, "MAC password hint: ");
 586                         mehexdump(tmpdata+TF_FROM_BITS(TF_MAX_BITS), TF_SIZE_UNIT, TF_SIZE_UNIT, 1);
 587                         memset(tmpdata, 0, sizeof(tmpdata));
 588                 }
 589         }
 590
 591
 592         if ((strlen(progname) <= 9)
 593         && ((!strcmp(progname, "sksum"))
 594         || ((!memcmp(progname, "sk", 2))
 595         && (!memcmp(progname+3, "sum", 3)
 596         || !memcmp(progname+4, "sum", 3)
 597         || !memcmp(progname+5, "sum", 3)
 598         || !memcmp(progname+6, "sum", 3)))))
 599                 do_sksum(progname, argv+optind);
 600         if (!strcmp(progname, "tfbase64")) do_edbase64(argv+optind);
 601
 602         idx = optind;
 603
 604         if (argv[idx]) {
 605                 if (password || rawkey > TFC_RAWKEY_KEYFILE) goto _nokeyfd;
 606                 if (!strcmp(argv[idx], "-")) kfd = 0;
 607                 else kfd = open(argv[idx], O_RDONLY | O_LARGEFILE);
 608                 if (kfd == -1) xerror(NO, NO, YES, "%s", argv[idx]);
 609
 610                 lio = strnlen(argv[idx], PATH_MAX);
 611                 memset(argv[idx], '*', lio);
 612
 613                 idx++;
 614         }
 615         else password = YES;
 616
 617         errno = 0;
 618         if (do_full_key == NO && tweakf) {
 619                 int twfd;
 620
 621                 if (!strcmp(tweakf, "-")) twfd = 0;
 622                 else twfd = open(tweakf, O_RDONLY | O_LARGEFILE);
 623                 if (twfd == -1) xerror(NO, NO, YES, "%s", tweakf);
 624                 lio = ldone = xread(twfd, tweak, TF_TWEAK_SIZE);
 625                 if (lio == NOSIZE) xerror(NO, NO, YES, "%s", tweakf);
 626                 if (ldone < TF_TWEAK_SIZE)
 627                         xerror(NO, NO, YES, "%s: %zu bytes tweak required", tweakf, TF_TWEAK_SIZE);
 628                 xclose(twfd);
 629         }
 630
 631 _nokeyfd:
 632         errno = 0;
 633         if (argv[idx]) {
 634                 if (!strcmp(argv[idx], "-") && kfd) sfd = 0;
 635                 else {
 636                         sfd = open(argv[idx], O_RDONLY | O_LARGEFILE);
 637                         if (do_preserve_time) if (fstat(sfd, &s_stat) == -1)
 638                                 xerror(YES, NO, YES, "stat(%s)", argv[idx]);
 639                 }
 640                 if (sfd == -1) xerror(NO, NO, YES, "%s", argv[idx]);
 641
 642                 if (do_edcrypt == TFC_DO_DECRYPT && do_mac != NO && maxlen != NOFSIZE) {
 643                         if (verbose) tfc_esay("%s: disabling signature verification on "
 644                                 "requested partial decryption.", progname);
 645                         do_mac = NO;
 646                 }
 647
 648                 if ((do_mac >= TFC_MAC_VRFY || do_mac == TFC_MAC_DROP) && !do_mac_file) {
 649                         maxlen = tfc_fdsize(sfd);
 650                         if (maxlen == NOFSIZE)
 651                                 xerror(NO, YES, YES,
 652                                 "Cannot verify embedded MAC with non-seekable source!");
 653                         maxlen -= TF_FROM_BITS(macbits);
 654                 }
 655                 srcfname = argv[idx];
 656                 idx++;
 657         }
 658
 659         if (!do_mac_file && (do_mac >= TFC_MAC_VRFY && sfd == 0))
 660                 xerror(NO, YES, YES, "Cannot verify embedded MAC with non-seekable source!");
 661
 662         if (ctrsz == NOSIZE) ctrsz = TF_BLOCK_SIZE;
 663         if (ctrsz > TF_BLOCK_SIZE) ctrsz = TF_BLOCK_SIZE;
 664
 665         if (ctr_mode == TFC_MODE_ECB) goto _ctrskip1;
 666         errno = 0;
 667         if (counter_file) {
 668                 int ctrfd;
 669
 670                 if (!strcmp(counter_file, "-")) ctrfd = 0;
 671                 else ctrfd = open(counter_file, O_RDONLY | O_LARGEFILE);
 672                 if (ctrfd == -1) xerror(NO, NO, YES, "%s", counter_file);
 673                 lio = xread(ctrfd, ctr, ctrsz);
 674                 if (lio == NOSIZE) xerror(NO, NO, YES, "%s", counter_file);
 675                 if (lio < ctrsz) xerror(NO, YES, YES, "counter file is too small (%zu)!", lio);
 676                 xclose(ctrfd);
 677         }
 678         else if (counter_opt == TFC_CTR_HEAD) {
 679                 pblk = ctr;
 680                 ldone = 0;
 681                 lrem = lblock = ctrsz;
 682                 if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(sfd);
 683 _ctrragain:     lio = xread(sfd, pblk, lrem);
 684                 if (lio != NOSIZE) ldone += lio;
 685                 else {
 686                         if (errno != EIO && catch_all_errors != YES)
 687                                 xerror(NO, NO, NO, "%s", srcfname);
 688                         switch (error_action) {
 689                                 case TFC_ERRACT_CONT: xerror(YES, NO, NO, "%s", srcfname); goto _ctrragain; break;
 690                                 case TFC_ERRACT_SYNC:
 691                                 case TFC_ERRACT_LSYNC:
 692                                         xerror(YES, NO, NO, "%s", srcfname);
 693                                         lio = ldone = lrem = lblock;
 694                                         memset(ctr, 0, lio);
 695                                         if (rdpos == NOFSIZE) lseek(sfd, lio, SEEK_CUR);
 696                                         else lseek(sfd, rdpos + lio, SEEK_SET);
 697                                         break;
 698                                 default: xerror(NO, NO, NO, "%s", srcfname); break;
 699                         }
 700                 }
 701                 if (lio && lio < lrem) {
 702                         pblk += lio;
 703                         lrem -= lio;
 704                         goto _ctrragain;
 705                 }
 706                 total_processed_src += ldone;
 707         }
 708
 709 _ctrskip1:
 710         if (iseek) {
 711                 if (counter_opt == TFC_CTR_HEAD && ctr_mode != TFC_MODE_ECB)
 712                         iseek += ctrsz;
 713                 if (lseek(sfd, iseek, SEEK_SET) == -1)
 714                         xerror(ignore_seek_errors, NO, NO, "%s: seek failed", srcfname);
 715         }
 716
 717         if (ctr_mode == TFC_MODE_PLAIN) goto _plain;
 718
 719         if (verbose) tfc_esay("%s: hashing password", progname);
 720
 721         if (rawkey == TFC_RAWKEY_KEYFILE) {
 722                 tfc_yesno xtskeyset = NO;
 723
 724                 pblk = key;
 725 _xts2key:       ldone = 0;
 726                 lrem = lblock = TF_FROM_BITS(TFC_KEY_BITS);
 727                 if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(kfd);
 728 _keyragain:     lio = xread(kfd, pblk, lrem);
 729                 if (lio != NOSIZE) ldone += lio;
 730                 else {
 731                         if (errno != EIO && catch_all_errors != YES)
 732                                 xerror(NO, NO, NO, "reading key");
 733                         switch (error_action) {
 734                                 case TFC_ERRACT_CONT: xerror(YES, NO, NO, "reading key"); goto _keyragain; break;
 735                                 case TFC_ERRACT_SYNC:
 736                                 case TFC_ERRACT_LSYNC:
 737                                         xerror(YES, NO, NO, "reading key");
 738                                         lio = ldone = lrem = lblock;
 739                                         memset(key, 0, lio);
 740                                         if (rdpos == NOFSIZE) lseek(kfd, lio, SEEK_CUR);
 741                                         else lseek(kfd, rdpos + lio, SEEK_SET);
 742                                         break;
 743                                 default: xerror(NO, NO, NO, "reading key"); break;
 744                         }
 745                 }
 746                 if (lio && lio < lrem) {
 747                         pblk += lio;
 748                         lrem -= lio;
 749                         goto _keyragain;
 750                 }
 751                 if (ldone < lblock) xerror(NO, YES, YES, "rawkey too small! (%zu)", ldone);
 752
 753                 if (ctr_mode == TFC_MODE_XTS) {
 754                         if (xtskeyset == NO) {
 755                                 pblk = xtskey;
 756                                 xtskeyset = YES;
 757                                 goto _xts2key;
 758                         }
 759                 }
 760         }
 761         else if (rawkey == TFC_RAWKEY_ASKSTR) {
 762                 tfc_yesno xtskeyset = NO;
 763
 764                 pblk = key; n = sizeof(key);
 765 _xts2keyaskstr: memset(&getps, 0, sizeof(struct getpasswd_state));
 766                 getps.fd = getps.efd = -1;
 767                 getps.passwd = (char *)pblk;
 768                 getps.pwlen = n;
 769                 getps.echo = pw_prompt ? pw_prompt : "Enter rawkey (str): ";
 770                 getps.charfilter = getps_filter;
 771                 getps.maskchar = 'x';
 772                 getps.flags = GETP_WAITFILL;
 773                 n = xgetpasswd(&getps);
 774                 if (n == NOSIZE) xerror(NO, NO, YES, "getting string rawkey");
 775                 if (n == ((size_t)-2)) xexit(1);
 776                 if (ctr_mode == TFC_MODE_XTS) {
 777                         if (xtskeyset == NO) {
 778                                 pblk = xtskey; n = sizeof(xtskey);
 779                                 xtskeyset = YES;
 780                                 goto _xts2keyaskstr;
 781                         }
 782                 }
 783         }
 784         else if (rawkey == TFC_RAWKEY_ASKHEX) {
 785                 tfc_yesno xtskeyset = NO;
 786
 787                 pblk = key;
 788 _rawkey_hex_again:
 789                 memset(&getps, 0, sizeof(struct getpasswd_state));
 790                 getps.fd = getps.efd = -1;
 791                 getps.passwd = pwdask;
 792                 getps.pwlen = (TF_FROM_BITS(TFC_KEY_BITS)*2);
 793                 getps.echo = pw_prompt ? pw_prompt : "Enter rawkey (hex): ";
 794                 getps.charfilter = getps_hex_filter;
 795                 getps.maskchar = 'x';
 796                 getps.flags = GETP_WAITFILL;
 797                 n = xgetpasswd(&getps);
 798                 if (n == NOSIZE) xerror(NO, NO, YES, "getting hex rawkey");
 799                 if (n == ((size_t)-2)) xexit(1);
 800                 if (n % 2) {
 801                         tfc_esay("Please input even number of hex digits!");
 802                         goto _rawkey_hex_again;
 803                 }
 804                 hex2bin(pblk, pwdask);
 805                 memset(pwdask, 0, sizeof(pwdask));
 806                 if (ctr_mode == TFC_MODE_XTS) {
 807                         if (xtskeyset == NO) {
 808                                 pblk = xtskey;
 809                                 xtskeyset = YES;
 810                                 goto _rawkey_hex_again;
 811                         }
 812                 }
 813         }
 814         else if (password) {
 815 _pwdagain:      memset(&getps, 0, sizeof(struct getpasswd_state));
 816                 getps.fd = getps.efd = -1;
 817                 getps.passwd = pwdask;
 818                 getps.pwlen = sizeof(pwdask)-1;
 819                 getps.echo = pw_prompt ? pw_prompt : "Enter password: ";
 820                 getps.charfilter = getps_filter;
 821                 getps.maskchar = 'x';
 822                 getps.flags = GETP_WAITFILL;
 823                 n = xgetpasswd(&getps);
 824                 if (n == NOSIZE) xerror(NO, NO, YES, "getting password");
 825                 if (n == ((size_t)-2)) xexit(1);
 826                 if (do_edcrypt == TFC_DO_ENCRYPT && no_repeat == NO) {
 827                         getps.fd = getps.efd = -1;
 828                         getps.passwd = pwdagain;
 829                         getps.pwlen = sizeof(pwdagain)-1;
 830                         getps.echo = "Enter it again: ";
 831                         getps.flags = GETP_WAITFILL;
 832                         n = xgetpasswd(&getps);
 833                         if (n == NOSIZE) xerror(NO, NO, YES, "getting password again");
 834                         if (n == ((size_t)-2)) xexit(1);
 835                         if (strncmp(pwdask, pwdagain, sizeof(pwdagain)-1) != 0) {
 836                                 tfc_esay("Passwords are different, try again");
 837                                 goto _pwdagain;
 838                         }
 839                 }
 840                 skein(key, TFC_KEY_BITS, mackey_opt ? mackey : NULL, pwdask, n);
 841                 memset(pwdask, 0, sizeof(pwdask));
 842                 memset(pwdagain, 0, sizeof(pwdagain));
 843         }
 844         else {
 845                 if (skeinfd(key, TFC_KEY_BITS, mackey_opt ? mackey : NULL, kfd, keyoffset, maxkeylen) != YES)
 846                         xerror(NO, NO, YES, "hashing key");
 847         }
 848
 849         if (rawkey == NO) {
 850                 if (tfc_saltsz > 0) {
 851                         memcpy(tfc_salt+tfc_saltsz, key, TF_FROM_BITS(TFC_KEY_BITS));
 852                         skein(key, TFC_KEY_BITS, mackey_opt ? mackey : NULL, tfc_salt, tfc_saltsz+TF_FROM_BITS(TFC_KEY_BITS));
 853                 }
 854                 if (nr_turns > 1) for (x = 0; x < nr_turns; x++)
 855                         skein(key, TFC_KEY_BITS, mackey_opt ? mackey : NULL, key, TF_FROM_BITS(TFC_KEY_BITS));
 856                 memset(tfc_salt, 0, TFC_MAX_SALT);
 857         }
 858
 859         if (ctr_mode == TFC_MODE_XTS && rawkey == NO) {
 860                 skein(xtskey, TF_NR_KEY_BITS, mackey_opt ? mackey : NULL, key, TF_FROM_BITS(TFC_KEY_BITS));
 861         }
 862
 863         if (genkeyf) {
 864                 int krfd;
 865                 tfc_yesno xtskeyset = NO;
 866
 867                 pblk = key;
 868                 if (!strcmp(genkeyf, "-")) krfd = 1;
 869                 else krfd = open(genkeyf, O_WRONLY | O_CREAT | O_LARGEFILE | write_flags, 0666);
 870                 if (krfd == -1) xerror(NO, NO, YES, "%s", genkeyf);
 871 _xts2genkey:    if (xwrite(krfd, pblk, TF_FROM_BITS(TFC_KEY_BITS)) == NOSIZE) xerror(NO, NO, YES, "%s", genkeyf);
 872                 if (do_fsync && fsync(krfd) == -1) xerror(NO, NO, YES, "%s", genkeyf);
 873                 if (verbose && xtskeyset == NO) {
 874                         tfc_esay("%s: password hashing done", progname);
 875                         tfc_esay("%s: rawkey written to %s.", progname, genkeyf);
 876                         tfc_esay("%s: Have a nice day!", progname);
 877                 }
 878
 879                 if (ctr_mode == TFC_MODE_XTS) {
 880                         if (xtskeyset == NO) {
 881                                 pblk = xtskey;
 882                                 xtskeyset = YES;
 883                                 goto _xts2genkey;
 884                         }
 885                 }
 886
 887                 fchmod(krfd, 0600);
 888                 xclose(krfd);
 889                 xexit(0);
 890         }
 891
 892         if (iseek_blocks && (do_edcrypt == TFC_DO_DECRYPT && do_mac != NO)) {
 893                 if (verbose) tfc_esay("%s: disabling signature verification on "
 894                         "requested partial decryption.", progname);
 895                 do_mac = NO;
 896         }
 897
 898         if (do_mac != NO) {
 899                 if (mackey_opt == TFC_MACKEY_RAWKEY) skein(mackey, TF_MAX_BITS, key, key, TF_FROM_BITS(TFC_KEY_BITS));
 900                 if (ctr_mode < TFC_MODE_OCB) {
 901                         if (verbose) tfc_esay("%s: doing MAC calculation, processing speed "
 902                                 "will be slower.", progname);
 903                         if (mackey_opt) skein_init_key(&sk, mackey, macbits);
 904                         else skein_init(&sk, macbits);
 905                 }
 906         }
 907
 908         if (!counter_file && counter_opt <= TFC_CTR_SHOW && ctr_mode != TFC_MODE_ECB) {
 909                 skein(ctr, TF_TO_BITS(ctrsz), mackey_opt ? mackey : NULL, key, TF_FROM_BITS(TFC_KEY_BITS));
 910         }
 911
 912         tf_convkey(key);
 913         if (ctr_mode == TFC_MODE_XTS) tf_convkey(xtskey);
 914         if (do_full_key == NO) {
 915                 if (!tweakf) skein(tweak, TF_NR_TWEAK_BITS, NULL, key, TF_FROM_BITS(TFC_KEY_BITS));
 916                 tf_tweak_set(key, tweak);
 917         }
 918         if (ctr_mode == TFC_MODE_ECB) goto _ctrskip2;
 919         tfc_data_to_words64(&iseek_blocks, sizeof(iseek_blocks));
 920         tf_ctr_set(ctr, &iseek_blocks, sizeof(iseek_blocks));
 921
 922         switch (counter_opt) {
 923                 case TFC_CTR_SHOW:
 924                         switch (do_outfmt) {
 925                                 case TFC_OUTFMT_B64: tfc_printbase64(stderr, ctr, ctrsz, YES); break;
 926                                 case TFC_OUTFMT_RAW: xwrite(2, ctr, ctrsz); break;
 927                                 case TFC_OUTFMT_HEX: mehexdump(ctr, ctrsz, ctrsz, YES); break;
 928                         }
 929                         break;
 930                 case TFC_CTR_RAND: tfc_getrandom(ctr, ctrsz); break;
 931                 case TFC_CTR_ZERO: memset(ctr, 0, ctrsz); break;
 932         }
 933
 934 _ctrskip2:
 935         if (kfd != -1) {
 936                 xclose(kfd);
 937                 kfd = -1;
 938         }
 939         if (verbose) tfc_esay("%s: password hashing done", progname);
 940
 941         if (overwrite_source && srcfname) argv[idx] = srcfname;
 942
 943 _plain:
 944         if (argv[idx]) {
 945                 if (!strcmp(argv[idx], "-")) dfd = 1;
 946                 else dfd = open(argv[idx], O_RDWR | O_LARGEFILE | write_flags, 0666);
 947                 if (dfd == -1) {
 948                         dfd = open(argv[idx], O_WRONLY | O_CREAT | O_LARGEFILE | write_flags, 0666);
 949                         if (dfd == -1) xerror(NO, NO, YES, "%s", argv[idx]);
 950                 }
 951                 dstfname = argv[idx];
 952                 idx++;
 953         }
 954
 955         if (oseek) {
 956                 if (lseek(dfd, oseek, SEEK_SET) == -1)
 957                         xerror(ignore_seek_errors, NO, NO, "%s: seek failed", dstfname);
 958         }
 959
 960         for (x = 1; x < NSIG; x++) signal(x, SIG_IGN);
 961         memset(&sigact, 0, sizeof(sigact));
 962         sigact.sa_flags = SA_RESTART;
 963         sigact.sa_handler = print_crypt_status;
 964         sigaction(SIGUSR1, &sigact, NULL);
 965         sigaction(SIGTSTP, &sigact, NULL);
 966         sigaction(SIGALRM, &sigact, NULL);
 967         if (status_timer) setup_next_alarm(status_timer);
 968         sigact.sa_handler = change_status_width;
 969         sigaction(SIGQUIT, &sigact, NULL);
 970         sigact.sa_handler = change_status_timer;
 971         sigaction(SIGUSR2, &sigact, NULL);
 972         if (quiet == NO) {
 973                 sigact.sa_handler = print_crypt_status;
 974                 sigaction(SIGINT, &sigact, NULL);
 975                 sigaction(SIGTERM, &sigact, NULL);
 976         }
 977         else {
 978                 sigact.sa_handler = exit_sigterm;
 979                 sigaction(SIGINT, &sigact, NULL);
 980                 sigaction(SIGTERM, &sigact, NULL);
 981         }
 982         memset(&sigact, 0, sizeof(struct sigaction));
 983
 984         tfc_getcurtime(&delta_time);
 985
 986         errno = 0;
 987         if (counter_opt == TFC_CTR_RAND && ctr_mode != TFC_MODE_ECB) {
 988                 pblk = ctr;
 989                 lio = lrem = ctrsz;
 990                 ldone = 0;
 991 _ctrwagain:     lio = xwrite(dfd, pblk, lrem);
 992                 if (lio != NOSIZE) ldone += lio;
 993                 else xerror(NO, NO, NO, "%s", dstfname);
 994                 if (do_fsync && fsync(dfd) == -1) xerror(NO, NO, NO, "%s", dstfname);
 995                 if (lio < lrem) {
 996                         pblk += lio;
 997                         lrem -= lio;
 998                         goto _ctrwagain;
 999                 }
1000                 total_processed_dst += ldone;
1001                 delta_processed += ldone;
1002         }
1003
1004         if (ctr_mode == TFC_MODE_STREAM) tfe_init_iv(&tfe, key, ctr);
1005
1006         errno = 0;
1007         do_stop = NO;
1008         while (1) {
1009                 if (do_stop) break;
1010                 pblk = srcblk;
1011                 ldone = 0;
1012                 lrem = lblock = blk_len_adj(maxlen, total_processed_src, blksize);
1013                 if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(sfd);
1014 _ragain:        lio = xread(sfd, pblk, lrem);
1015                 if (lio == 0) do_stop = TFC_STOP_BEGAN;
1016                 if (lio != NOSIZE) ldone += lio;
1017                 else {
1018                         if (errno != EIO && catch_all_errors != YES)
1019                                 xerror(NO, NO, NO, "%s", srcfname);
1020                         switch (error_action) {
1021                                 case TFC_ERRACT_CONT: xerror(YES, NO, NO, "%s", srcfname); goto _ragain; break;
1022                                 case TFC_ERRACT_SYNC:
1023                                 case TFC_ERRACT_LSYNC:
1024                                         xerror(YES, NO, NO, "%s", srcfname);
1025                                         lio = ldone = lrem = lblock;
1026                                         memset(srcblk, 0, lio);
1027                                         if (rdpos == NOFSIZE) lseek(sfd, lio, SEEK_CUR);
1028                                         else lseek(sfd, rdpos + lio, SEEK_SET);
1029                                         break;
1030                                 default: xerror(NO, NO, NO, "%s", srcfname); break;
1031                         }
1032                 }
1033                 if (lio && lio < lrem) {
1034                         pblk += lio;
1035                         lrem -= lio;
1036                         goto _ragain;
1037                 }
1038                 total_processed_src += ldone;
1039
1040                 if (do_pad && (ldone % TF_BLOCK_SIZE)) {
1041                         size_t orig = ldone;
1042                         ldone += (TF_BLOCK_SIZE - (ldone % TF_BLOCK_SIZE));
1043                         if (ldone > blksize) ldone = blksize;
1044                         memset(srcblk+orig, 0, sizeof(srcblk)-orig);
1045                 }
1046
1047                 if (do_mac == TFC_MAC_SIGN && ctr_mode < TFC_MODE_OCB)
1048                         skein_update(&sk, srcblk, ldone);
1049
1050                 if (ctr_mode == TFC_MODE_CTR) tf_ctr_crypt(key, ctr, dstblk, srcblk, ldone);
1051                 else if (ctr_mode == TFC_MODE_STREAM) tf_stream_crypt(&tfe, dstblk, srcblk, ldone);
1052                 else if (ctr_mode == TFC_MODE_XTS && do_edcrypt == TFC_DO_ENCRYPT)
1053                         tf_xts_encrypt(key, xtskey, ctr, dstblk, srcblk, ldone, xtsblocks);
1054                 else if (ctr_mode == TFC_MODE_XTS && do_edcrypt == TFC_DO_DECRYPT)
1055                         tf_xts_decrypt(key, xtskey, ctr, dstblk, srcblk, ldone, xtsblocks);
1056                 else if (ctr_mode == TFC_MODE_ECB && do_edcrypt == TFC_DO_ENCRYPT)
1057                         tf_ecb_encrypt(key, dstblk, srcblk, ldone);
1058                 else if (ctr_mode == TFC_MODE_ECB && do_edcrypt == TFC_DO_DECRYPT)
1059                         tf_ecb_decrypt(key, dstblk, srcblk, ldone);
1060                 else if (ctr_mode == TFC_MODE_CBC && do_edcrypt == TFC_DO_ENCRYPT)
1061                         tf_cbc_encrypt(key, ctr, dstblk, srcblk, ldone);
1062                 else if (ctr_mode == TFC_MODE_CBC && do_edcrypt == TFC_DO_DECRYPT)
1063                         tf_cbc_decrypt(key, ctr, dstblk, srcblk, ldone);
1064
1065                 else if (ctr_mode == TFC_MODE_OCB && do_edcrypt == TFC_DO_ENCRYPT)
1066                         tf_ocb_encrypt(key, ctr, dstblk, do_mac == TFC_MAC_SIGN ? macresult : NULL, srcblk, ldone, xtsblocks);
1067                 else if (ctr_mode == TFC_MODE_OCB && do_edcrypt == TFC_DO_DECRYPT)
1068                         tf_ocb_decrypt(key, ctr, dstblk, do_mac >= TFC_MAC_VRFY ? macresult : NULL, srcblk, ldone, xtsblocks);
1069
1070                 else if (ctr_mode == TFC_MODE_PLAIN)
1071                         memcpy(dstblk, srcblk, ldone);
1072
1073                 if (do_mac >= TFC_MAC_VRFY && ctr_mode < TFC_MODE_OCB)
1074                         skein_update(&sk, dstblk, ldone);
1075                 if (do_mac == TFC_MAC_JUST_VRFY) goto _nowrite;
1076
1077                 pblk = dstblk;
1078                 lrem = ldone;
1079                 ldone = 0;
1080 _wagain:        lio = xwrite(dfd, pblk, lrem);
1081                 if (lio != NOSIZE) ldone += lio;
1082                 else xerror(NO, NO, NO, "%s", dstfname);
1083                 if (do_fsync && fsync(dfd) == -1) xerror(NO, NO, NO, "%s", dstfname);
1084                 if (lio < lrem) {
1085                         pblk += lio;
1086                         lrem -= lio;
1087                         goto _wagain;
1088                 }
1089 _nowrite:       total_processed_dst += ldone;
1090                 delta_processed += ldone;
1091
1092                 if (maxlen != NOFSIZE && total_processed_src >= maxlen) break;
1093         }
1094
1095         if (do_stop == TFC_STOP_FULL) goto _nomac;
1096
1097         errno = 0;
1098         if (do_mac >= TFC_MAC_VRFY) {
1099                 if (!do_mac_file) {
1100                         pblk = macvrfy;
1101                         ldone = 0;
1102                         lrem = lblock = TF_FROM_BITS(macbits);
1103                         if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(sfd);
1104 _macragain:             lio = xread(sfd, pblk, lrem);
1105                         if (lio != NOSIZE) ldone += lio;
1106                         else {
1107                                 if (errno != EIO && catch_all_errors != YES)
1108                                         xerror(NO, NO, NO, "%s", srcfname);
1109                                 switch (error_action) {
1110                                         case TFC_ERRACT_CONT: xerror(YES, NO, NO, "%s", srcfname); goto _macragain; break;
1111                                         case TFC_ERRACT_SYNC:
1112                                         case TFC_ERRACT_LSYNC:
1113                                                 xerror(YES, NO, NO, "%s", srcfname);
1114                                                 lio = ldone = lrem = lblock;
1115                                                 memset(macvrfy, 0, lio);
1116                                                 if (rdpos == NOFSIZE) lseek(sfd, lio, SEEK_CUR);
1117                                                 else lseek(sfd, rdpos + lio, SEEK_SET);
1118                                                 break;
1119                                         default: xerror(NO, NO, NO, "%s", srcfname); break;
1120                                 }
1121                         }
1122                         if (lio && lio < lrem) {
1123                                 pblk += lio;
1124                                 lrem -= lio;
1125                                 goto _macragain;
1126                         }
1127                         total_processed_src += ldone;
1128                 }
1129                 else {
1130                         int mfd;
1131
1132                         if (!strcmp(do_mac_file, "-")) mfd = 0;
1133                         else mfd = open(do_mac_file, O_RDONLY | O_LARGEFILE);
1134                         if (mfd == -1) xerror(YES, NO, NO, "%s", do_mac_file);
1135                         lio = ldone = xread(mfd, tmpdata, sizeof(tmpdata));
1136                         if (lio == NOSIZE) xerror(NO, NO, YES, "%s", do_mac_file);
1137                         if (!memcmp(tmpdata, TFC_ASCII_TFC_MAC_FOURCC, TFC_ASCII_TFC_MAC_FOURCC_LEN)) {
1138                                 memmove(tmpdata, tmpdata+TFC_ASCII_TFC_MAC_FOURCC_LEN,
1139                                         sizeof(tmpdata)-TFC_ASCII_TFC_MAC_FOURCC_LEN);
1140                                 lio = TF_FROM_BITS(macbits);
1141                                 base64_decode((char *)macvrfy, lio, (char *)tmpdata, sizeof(tmpdata));
1142                         }
1143                         else memcpy(macvrfy, tmpdata, TF_FROM_BITS(macbits));
1144                         xclose(mfd);
1145                 }
1146
1147                 if (ldone < TF_FROM_BITS(macbits)) {
1148                         if (quiet == NO) tfc_esay("%s: short signature (%zu), "
1149                                 "not verifying", progname, ldone);
1150                         exitcode = 1;
1151                         goto _shortmac;
1152                 }
1153
1154                 if (ctr_mode < TFC_MODE_OCB) skein_final(macresult, &sk);
1155                 else skein(macresult, macbits, mackey, macresult, TF_FROM_BITS(macbits));
1156
1157                 if (ctr_mode == TFC_MODE_CTR) tf_ctr_crypt(key, ctr, tmpdata, macvrfy, TF_FROM_BITS(macbits));
1158                 else if (ctr_mode == TFC_MODE_STREAM) tf_stream_crypt(&tfe, tmpdata, macvrfy, TF_FROM_BITS(macbits));
1159                 else if (ctr_mode == TFC_MODE_XTS) tf_xts_decrypt(key, xtskey, ctr, tmpdata, macvrfy, TF_FROM_BITS(macbits), xtsblocks);
1160                 else if (ctr_mode == TFC_MODE_ECB) tf_ecb_decrypt(key, tmpdata, macvrfy, TF_FROM_BITS(macbits));
1161                 else if (ctr_mode == TFC_MODE_CBC) tf_cbc_decrypt(key, ctr, tmpdata, macvrfy, TF_FROM_BITS(macbits));
1162                 else if (ctr_mode == TFC_MODE_OCB) tf_ocb_decrypt(key, ctr, tmpdata, NULL, macvrfy, TF_FROM_BITS(macbits), xtsblocks);
1163
1164                 if (!memcmp(tmpdata, macresult, TF_FROM_BITS(macbits))) {
1165                         if (quiet == NO) {
1166                                 tfc_esay("%s: signature is good", progname);
1167                                 if (verbose) {
1168                                         if (do_outfmt == TFC_OUTFMT_B64) tfc_printbase64(stderr, macresult, TF_FROM_BITS(macbits), YES);
1169                                         else mehexdump(macresult, TF_FROM_BITS(macbits), TF_FROM_BITS(macbits), YES);
1170                                 }
1171                         }
1172                 }
1173                 else {
1174                         if (quiet == NO) tfc_esay("%s: signature is BAD: "
1175                                 "wrong password, key, mode, or file is not signed", progname);
1176                         exitcode = 1;
1177                 }
1178
1179 _shortmac:      memset(macvrfy, 0, sizeof(macvrfy));
1180                 memset(macresult, 0, sizeof(macresult));
1181                 memset(tmpdata, 0, sizeof(tmpdata));
1182         }
1183
1184         else if (do_mac == TFC_MAC_SIGN) {
1185                 if (ctr_mode < TFC_MODE_OCB) skein_final(macresult, &sk);
1186                 else skein(macresult, macbits, mackey, macresult, TF_FROM_BITS(macbits));
1187
1188                 if (ctr_mode == TFC_MODE_CTR) tf_ctr_crypt(key, ctr, tmpdata, macresult, TF_FROM_BITS(macbits));
1189                 else if (ctr_mode == TFC_MODE_STREAM) tf_stream_crypt(&tfe, tmpdata, macresult, TF_FROM_BITS(macbits));
1190                 else if (ctr_mode == TFC_MODE_XTS) tf_xts_encrypt(key, xtskey, ctr, tmpdata, macresult, TF_FROM_BITS(macbits), xtsblocks);
1191                 else if (ctr_mode == TFC_MODE_ECB) tf_ecb_encrypt(key, tmpdata, macresult, TF_FROM_BITS(macbits));
1192                 else if (ctr_mode == TFC_MODE_CBC) tf_cbc_encrypt(key, ctr, tmpdata, macresult, TF_FROM_BITS(macbits));
1193                 else if (ctr_mode == TFC_MODE_OCB) tf_ocb_encrypt(key, ctr, tmpdata, NULL, macresult, TF_FROM_BITS(macbits), xtsblocks);
1194                 memset(macresult, 0, sizeof(macresult));
1195
1196                 if (!do_mac_file) {
1197                         pblk = tmpdata;
1198                         lio = lrem = TF_FROM_BITS(macbits);
1199                         ldone = 0;
1200 _macwagain:             lio = xwrite(dfd, pblk, lrem);
1201                         if (lio != NOSIZE) ldone += lio;
1202                         else xerror(NO, NO, NO, "%s", dstfname);
1203                         if (do_fsync && fsync(dfd) == -1) xerror(NO, NO, NO, "%s", dstfname);
1204                         if (lio < lrem) {
1205                                 pblk += lio;
1206                                 lrem -= lio;
1207                                 goto _macwagain;
1208                         }
1209                         total_processed_dst += ldone;
1210                         delta_processed += ldone;
1211                 }
1212                 else {
1213                         int mfd;
1214
1215                         if (!strcmp(do_mac_file, "-")) mfd = 1;
1216                         else mfd = open(do_mac_file, O_WRONLY | O_CREAT | O_LARGEFILE | write_flags, 0666);
1217                         if (mfd == -1) xerror(YES, NO, NO, "%s", do_mac_file);
1218                         if (do_outfmt == TFC_OUTFMT_B64) {
1219                                 memcpy(macvrfy, tmpdata, TF_FROM_BITS(macbits));
1220                                 memset(tmpdata, 0, TFC_TMPSIZE);
1221                                 memcpy(tmpdata, TFC_ASCII_TFC_MAC_FOURCC, TFC_ASCII_TFC_MAC_FOURCC_LEN);
1222                                 base64_encode((char *)tmpdata+TFC_ASCII_TFC_MAC_FOURCC_LEN, (char *)macvrfy, TF_FROM_BITS(macbits));
1223                                 lrem = strnlen((char *)tmpdata, sizeof(tmpdata));
1224                                 if (lrem) {
1225                                         tmpdata[lrem] = '\n';
1226                                         lrem++;
1227                                 }
1228                                 lio = xwrite(mfd, tmpdata, lrem);
1229                         }
1230                         else lio = xwrite(mfd, tmpdata, TF_FROM_BITS(macbits));
1231                         if (lio == NOSIZE) xerror(NO, NO, YES, "%s", do_mac_file);
1232                         if (do_fsync && fsync(mfd) == -1) xerror(NO, NO, YES, "%s", do_mac_file);
1233                         xclose(mfd);
1234                 }
1235
1236                 memset(macvrfy, 0, sizeof(macvrfy));
1237                 memset(macresult, 0, sizeof(macresult));
1238                 memset(tmpdata, 0, sizeof(tmpdata));
1239         }
1240
1241 _nomac:
1242         if (verbose || status_timer || do_stop == TFC_STOP_FULL) print_crypt_status(0);
1243
1244         if (do_preserve_time) fcopy_matime(dfd, &s_stat);
1245         xclose(sfd);
1246         xclose(dfd);
1247
1248         xexit(exitcode);
1249         return -1;
1250 }