tfcrypt.c

   1 /*
   2  * tfcrypt -- high security Threefish encryption tool.
   3  *
   4  * tfcrypt is copyrighted:
   5  * Copyright (C) 2012-2019 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 tfc_byte svctr[TF_BLOCK_SIZE];
  32
  33 static void open_log(const char *logfile)
  34 {
  35         int fd;
  36
  37         if (!strcmp(logfile, "-")) return;
  38
  39         fd = open(logfile, O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC, 0666);
  40         if (fd == -1) xerror(NO, NO, YES, "%s", logfile);
  41         xclose(2);
  42         if (dup2(fd, 2) == -1) xexit(2);
  43         xclose(fd);
  44         do_statline_dynamic = NO;
  45 }
  46
  47 static int getps_filter(struct getpasswd_state *getps, char chr, size_t pos)
  48 {
  49         if (chr == '\x03') {
  50                 getps->retn = ((size_t)-2);
  51                 return 6;
  52         }
  53         return 1;
  54 }
  55
  56 static int getps_hex_filter(struct getpasswd_state *getps, char chr, size_t pos)
  57 {
  58         if (chr == '\x03') {
  59                 getps->retn = ((size_t)-2);
  60                 return 6;
  61         }
  62         if (chr >= '0' && chr <= '9') return 1;
  63         if (chr >= 'a' && chr <= 'f') return 1;
  64         if (chr >= 'A' && chr <= 'F') return 1;
  65         if (chr == '\x7f' || chr == '\x08'
  66         || chr == '\x15' || chr == '\x17') return 1;
  67         return 0;
  68 }
  69
  70 static inline int isctrlchr(int c)
  71 {
  72         if (c == 9) return 0;
  73         if (c >= 0 && c <= 31) return 1;
  74         if (c == 127) return 1;
  75         return 0;
  76 }
  77
  78 static int getps_plain_filter(struct getpasswd_state *getps, char chr, size_t pos)
  79 {
  80         int x;
  81
  82         x = getps_filter(getps, chr, pos);
  83         if (x != 1) return x;
  84
  85         if (pos < getps->pwlen && !isctrlchr(chr))
  86                 write(getps->efd, &chr, sizeof(char));
  87         return 1;
  88 }
  89
  90 static int getps_plain_hex_filter(struct getpasswd_state *getps, char chr, size_t pos)
  91 {
  92         int x;
  93
  94         x = getps_hex_filter(getps, chr, pos);
  95         if (x != 1) return x;
  96
  97         if (pos < getps->pwlen && !isctrlchr(chr))
  98                 write(getps->efd, &chr, sizeof(char));
  99         return 1;
 100 }
 101
 102 static void make_hint(void *hint, size_t szhint, const void *data, size_t szdata)
 103 {
 104         char t[TF_FROM_BITS(TF_MAX_BITS)];
 105
 106         skein(t, TF_MAX_BITS, NULL, data, szdata);
 107         xor_shrink(hint, szhint, t, sizeof(t));
 108         memset(t, 0, sizeof(t));
 109 }
 110
 111 static void raw_say_hint(void *hint, size_t szhint, const void *data, size_t szdata, const char *prompt)
 112 {
 113         make_hint(hint, szhint, data, szdata);
 114         if (prompt) tfc_nfsay(stderr, "%s: ", prompt);
 115         mehexdump(hint, szhint, szhint, 1);
 116         memset(hint, 0, szhint);
 117 }
 118
 119 static void say_hint(const void *data, size_t szdata, const char *prompt)
 120 {
 121         char t[TF_SIZE_UNIT];
 122         raw_say_hint(t, TF_SIZE_UNIT, data, szdata, prompt);
 123         /* t[] is erased (automatically) */
 124 }
 125
 126 int main(int argc, char **argv)
 127 {
 128         int c;
 129         double td;
 130         char *s, *d, *t, *stoi;
 131         size_t x, n;
 132         tfc_fsize rwd;
 133
 134         progname = basename(argv[0]);
 135
 136         if (!isatty(2)) do_statline_dynamic = NO;
 137
 138         s = (char *)srcblk;
 139         d = getenv("HOME");
 140         if (!d) d = "";
 141         n = PATH_MAX > sizeof(srcblk) ? sizeof(srcblk) : PATH_MAX;
 142         if (xstrlcpy(s, d, n) >= n) goto _baddfname;
 143         if (xstrlcat(s, "/.tfcrypt.defs", n) >= n) goto _baddfname;
 144         read_defaults(s, YES);
 145 _baddfname:
 146         memset(s, 0, n);
 147
 148         if (!strcmp(progname, "iotool")) {
 149                 do_edcrypt = TFC_DO_PLAIN;
 150                 password = YES;
 151                 ctr_mode = TFC_MODE_PLAIN;
 152         }
 153
 154         opterr = 0;
 155         while ((c = getopt(argc, argv, "L:s:aU:C:r:K:t:Pkzxc:l:qedn:vV:pwE:o:O:S:AmuM:R:Z:WHD:")) != -1) {
 156                 switch (c) {
 157                         case 'L':
 158                                 read_defaults(optarg, NO);
 159                                 break;
 160                         case 's':
 161                                 saltf = optarg;
 162                                 break;
 163                         case 'r':
 164                                 randsource = optarg;
 165                                 break;
 166                         case 'c':
 167                                 if (!strcasecmp(optarg, "show"))
 168                                         counter_opt = TFC_CTR_SHOW;
 169                                 else if (!strcasecmp(optarg, "head"))
 170                                         counter_opt = TFC_CTR_HEAD;
 171                                 else if (!strcasecmp(optarg, "rand"))
 172                                         counter_opt = TFC_CTR_RAND;
 173                                 else if (!strcasecmp(optarg, "zero"))
 174                                         counter_opt = TFC_CTR_ZERO;
 175                                 else if (strchr(optarg, ':')) {
 176                                         char *ss, chr;
 177
 178                                         counter_opt = TFC_CTR_SSET;
 179                                         n = sizeof(ctr);
 180
 181                                         s = d = optarg; t = NULL;
 182                                         while ((s = strtok_r(d, ",", &t))) {
 183                                                 if (d) d = NULL;
 184
 185                                                 if (n == 0) break;
 186                                                 ss = strchr(s, ':');
 187                                                 if (!ss) continue;
 188                                                 *ss = 0; ss++;
 189                                                 chr = (char)strtoul(s, &stoi, 16);
 190                                                 if (!str_empty(stoi)) continue;
 191                                                 x = (size_t)strtoul(ss, &stoi, 10);
 192                                                 if (!str_empty(stoi)) continue;
 193                                                 if (x > n) x = n;
 194                                                 memset(ctr+(sizeof(ctr)-n), (int)chr, x);
 195                                                 n -= x;
 196                                         }
 197                                 }
 198                                 else counter_file = sksum_hashlist_file = optarg;
 199                                 break;
 200                         case 'C':
 201                                 if (!strcasecmp(optarg, "ctr"))
 202                                         ctr_mode = TFC_MODE_CTR;
 203                                 else if (!strcasecmp(optarg, "stream"))
 204                                         ctr_mode = TFC_MODE_STREAM;
 205                                 else if (!strcasecmp(optarg, "cbc"))
 206                                         ctr_mode = TFC_MODE_CBC;
 207                                 else if (!strcasecmp(optarg, "ecb"))
 208                                         ctr_mode = TFC_MODE_ECB;
 209                                 else if (!strcasecmp(optarg, "xts"))
 210                                         ctr_mode = TFC_MODE_XTS;
 211                                 else if (!strcasecmp(optarg, "ocb"))
 212                                         ctr_mode = TFC_MODE_OCB;
 213                                 else xerror(NO, YES, YES, "%s: invalid mode of operation", optarg);
 214                                 break;
 215                         case 'P':
 216                                 do_edcrypt = TFC_DO_PLAIN;
 217                                 password = YES;
 218                                 ctr_mode = TFC_MODE_PLAIN;
 219                                 break;
 220                         case 'e':
 221                                 if (do_edcrypt != TFC_DO_PLAIN) do_edcrypt = TFC_DO_ENCRYPT;
 222                                 break;
 223                         case 'd':
 224                                 if (do_edcrypt != TFC_DO_PLAIN) do_edcrypt = TFC_DO_DECRYPT;
 225                                 break;
 226                         case 'D':
 227                                 macbits = strtoul(optarg, &stoi, 10);
 228                                 if (macbits == 0 || !str_empty(stoi) || macbits < 8
 229                                 || macbits > TF_MAX_BITS || macbits % 8)
 230                                         xerror(NO, YES, YES, "%s: invalid MAC bits setting", optarg);
 231                                 break;
 232                         case 'n':
 233                                 nr_turns = sksum_turns = strtoul(optarg, &stoi, 10);
 234                                 if (!str_empty(stoi)) xerror(NO, YES, YES, "%s: invalid number of turns", optarg);
 235                                 break;
 236                         case 'U':
 237                                 if (!strcasecmp(optarg, "key"))
 238                                         mackey_opt = TFC_MACKEY_RAWKEY;
 239                                 else if (!strcasecmp(optarg, "pwd"))
 240                                         mackey_opt = TFC_MACKEY_PASSWORD;
 241                                 else {
 242                                         mackey_opt = TFC_MACKEY_FILE;
 243                                         mackeyf = optarg;
 244                                 }
 245                                 break;
 246                         case 'p':
 247                                 password = YES;
 248                                 break;
 249                         case 'k':
 250                                 rawkey = TFC_RAWKEY_KEYFILE;
 251                                 break;
 252                         case 'z':
 253                                 rawkey = TFC_RAWKEY_ASKSTR;
 254                                 break;
 255                         case 'x':
 256                                 rawkey = TFC_RAWKEY_ASKHEX;
 257                                 break;
 258                         case 'K':
 259                                 verbose = YES;
 260                                 genkeyf = optarg;
 261                                 break;
 262                         case 't':
 263                                 tweakf = optarg;
 264                                 do_full_key = NO;
 265                                 break;
 266                         case 'l':
 267                                 if (maxlen != NOFSIZE) break;
 268
 269                                 maxlen = tfc_humanfsize(optarg, &stoi);
 270                                 if (!str_empty(stoi)) {
 271                                         maxlen = tfc_fnamesize(optarg, YES);
 272                                         maxlen = tfc_modifysize(maxlen, strchr(optarg, ':'));
 273                                         if (maxlen == NOFSIZE) xerror(NO, YES, YES,
 274                                         "%s: invalid count value", optarg);
 275                                 }
 276                                 else maxlen = tfc_modifysize(maxlen, strchr(optarg, ':'));
 277                                 if (counter_opt == TFC_CTR_HEAD)
 278                                         maxlen += TF_BLOCK_SIZE;
 279                                 break;
 280                         case 'w':
 281                                 overwrite_source = YES;
 282                                 break;
 283                         case 'E':
 284                                 if (!strcmp(optarg, "xall")) {
 285                                         catch_all_errors = YES;
 286                                         break;
 287                                 }
 288                                 if (!strcmp(optarg, "xseek")) {
 289                                         ignore_seek_errors = YES;
 290                                         break;
 291                                 }
 292                                 if (!strcmp(optarg, "exit"))
 293                                         error_action = TFC_ERRACT_EXIT;
 294                                 else if (!strncmp(optarg, "cont", 4))
 295                                         error_action = TFC_ERRACT_CONT;
 296                                 else if (!strcmp(optarg, "sync"))
 297                                         error_action = TFC_ERRACT_SYNC;
 298                                 else if (!strcmp(optarg, "lsync"))
 299                                         error_action = TFC_ERRACT_LSYNC;
 300                                 else xerror(NO, YES, YES, "invalid error action %s specified", optarg);
 301                                 break;
 302                         case 'o':
 303                                 open_log(optarg);
 304                                 break;
 305                         case 'O':
 306                                 s = d = optarg; t = NULL;
 307                                 while ((s = strtok_r(d, ",", &t))) {
 308                                         if (d) d = NULL;
 309                                         if (!strcmp(s, "sync"))
 310                                                 write_flags |= O_SYNC;
 311                                         else if (!strcmp(s, "trunc"))
 312                                                 write_flags |= O_TRUNC;
 313                                         else if (!strcmp(s, "fsync"))
 314                                                 do_fsync = YES;
 315                                         else if (!strcmp(s, "pad"))
 316                                                 do_pad = YES;
 317                                         else if (!strcmp(s, "xtime"))
 318                                                 do_preserve_time = YES;
 319                                         else if (!strcmp(s, "gibsize"))
 320                                                 do_stats_in_gibs = YES;
 321                                         else if (!strcmp(s, "plainstats"))
 322                                                 do_statline_dynamic = NO;
 323                                         else if (!strcmp(s, "statless"))
 324                                                 do_less_stats = YES;
 325                                         else if (!strcmp(s, "norepeat"))
 326                                                 no_repeat = YES;
 327                                         else if (!strncmp(s, "prompt", 6) && *(s+6) == '=')
 328                                                 pw_prompt = s+7;
 329                                         else if (!strncmp(s, "macprompt", 9) && *(s+9) == '=')
 330                                                 mac_pw_prompt = s+10;
 331                                         else if (!strcmp(s, "shorthex"))
 332                                                 do_full_hexdump = NO;
 333                                         else if (!strcmp(s, "fullkey"))
 334                                                 do_full_key = YES;
 335                                         else if (!strcmp(s, "showsecrets"))
 336                                                 show_secrets = YES;
 337                                         else if (!strcmp(s, "finished"))
 338                                                 show_when_done = YES;
 339                                         else if (!strncmp(s, "logfile", 7) && *(s+7) == '=')
 340                                                 open_log(s+8);
 341                                         else if (!strncmp(s, "iobs", 4) && *(s+4) == '=') {
 342                                                 s += 5;
 343                                                 blksize = (size_t)tfc_humanfsize(s, &stoi);
 344                                                 if (!str_empty(stoi)) {
 345                                                         blksize = (size_t)tfc_fnamesize(s, YES);
 346                                                         blksize = (size_t)tfc_modifysize((tfc_fsize)blksize, strchr(s, ':'));
 347                                                         if (blksize == NOSIZE) xerror(NO, YES, YES,
 348                                                         "%s: invalid block size value", s);
 349                                                 }
 350                                                 else blksize = (size_t)tfc_modifysize((tfc_fsize)blksize, strchr(s, ':'));
 351                                                 if (blksize < TF_BLOCK_SIZE) xerror(NO, YES, YES,
 352                                                         "%s: block size is lesser than TF_BLOCK_SIZE (%u bytes)", s, TFC_U(TF_BLOCK_SIZE));
 353                                                 if (blksize > TFC_BLKSIZE) xerror(NO, YES, YES,
 354                                                         "%s: block size exceeds %u bytes",
 355                                                         s, TFC_U(TFC_BLKSIZE));
 356                                         }
 357                                         else if (!strncmp(s, "xtsblocks", 9) && *(s+9) == '=') {
 358                                                 s += 10;
 359                                                 xtsblocks = (size_t)tfc_humanfsize(s, &stoi);
 360                                                 if (!str_empty(stoi)) {
 361                                                         xtsblocks = (size_t)tfc_fnamesize(s, YES);
 362                                                         xtsblocks = (size_t)tfc_modifysize((tfc_fsize)xtsblocks, strchr(s, ':'));
 363                                                         if (xtsblocks == NOSIZE) xerror(NO, YES, YES,
 364                                                         "%s: invalid blocks per xts block value", s);
 365                                                 }
 366                                                 else xtsblocks = (size_t)tfc_modifysize((tfc_fsize)xtsblocks, strchr(s, ':'));
 367                                                 if (TFC_BLKSIZE % xtsblocks) xerror(NO, YES, YES,
 368                                                         "%s: nr of blocks per xts block is not round to %u bytes",
 369                                                         s, TFC_U(TFC_BLKSIZE));
 370                                                 if ((xtsblocks * TF_BLOCK_SIZE) > TFC_BLKSIZE) xerror(NO, YES, YES,
 371                                                         "%s: nr of blocks per xts block exceeds %u bytes",
 372                                                         s, TFC_U(TFC_BLKSIZE));
 373                                         }
 374                                         else if (!strncmp(s, "iseek", 5) && *(s+5) == '=') {
 375                                                 s += 6;
 376                                                 iseek = tfc_humanfsize(s, &stoi);
 377                                                 if (!str_empty(stoi)) {
 378                                                         iseek = tfc_fnamesize(s, YES);
 379                                                         iseek = tfc_modifysize(iseek, strchr(s, ':'));
 380                                                         if (iseek == NOFSIZE) xerror(NO, YES, YES,
 381                                                         "%s: invalid iseek value", s);
 382                                                 }
 383                                                 else iseek = tfc_modifysize(iseek, strchr(s, ':'));
 384                                                 if (ctr_mode != TFC_MODE_PLAIN && iseek % TF_BLOCK_SIZE)
 385                                                         xerror(NO, YES, YES,
 386                                                                 "%s: not round to TF block size "
 387                                                                 "of %u bytes",
 388                                                                 s, TFC_U(TF_BLOCK_SIZE));
 389                                                 iseek_blocks = iseek / TF_BLOCK_SIZE;
 390                                         }
 391                                         else if (!strncmp(s, "ixseek", 6) && *(s+6) == '=') {
 392                                                 s += 7;
 393                                                 iseek = tfc_humanfsize(s, &stoi);
 394                                                 if (!str_empty(stoi)) {
 395                                                         iseek = tfc_fnamesize(s, YES);
 396                                                         iseek = tfc_modifysize(iseek, strchr(s, ':'));
 397                                                         if (iseek == NOFSIZE) xerror(NO, YES, YES,
 398                                                                 "%s: invalid ixseek value", s);
 399                                                 }
 400                                                 else iseek = tfc_modifysize(iseek, strchr(s, ':'));
 401                                         }
 402                                         else if (!strncmp(s, "ictr", 4) && *(s+4) == '=') {
 403                                                 s += 5;
 404                                                 iseek_blocks = tfc_humanfsize(s, &stoi);
 405                                                 if (!str_empty(stoi)) {
 406                                                         iseek_blocks = tfc_fnamesize(s, YES);
 407                                                         if (iseek_blocks == NOFSIZE)
 408                                                                 xerror(NO, YES, YES,
 409                                                                 "%s: invalid ictr value", s);
 410                                                         iseek_blocks /= TF_BLOCK_SIZE;
 411                                                         iseek_blocks = tfc_modifysize(iseek_blocks, strchr(s, ':'));
 412                                                 }
 413                                                 else iseek_blocks = tfc_modifysize(iseek_blocks, strchr(s, ':'));
 414                                         }
 415                                         else if (!strncmp(s, "ixctr", 5) && *(s+5) == '=') {
 416                                                 s += 6;
 417                                                 iseek_blocks = tfc_humanfsize(s, &stoi);
 418                                                 if (!str_empty(stoi)) {
 419                                                         iseek_blocks = tfc_fnamesize(s, YES);
 420                                                         iseek_blocks = tfc_modifysize(iseek_blocks, strchr(s, ':'));
 421                                                         if (iseek_blocks == NOFSIZE)
 422                                                                 xerror(NO, YES, YES,
 423                                                                 "%s: invalid ixctr value", s);
 424                                                 }
 425                                                 else iseek_blocks = tfc_modifysize(iseek_blocks, strchr(s, ':'));
 426                                                 if (iseek_blocks % TF_BLOCK_SIZE)
 427                                                         xerror(NO, YES, YES,
 428                                                         "%s: not round to TF block size "
 429                                                         "of %u bytes", s, TFC_U(TF_BLOCK_SIZE));
 430                                                 iseek_blocks /= TF_BLOCK_SIZE;
 431                                         }
 432                                         else if (!strncmp(s, "oseek", 5) && *(s+5) == '=') {
 433                                                 s += 6;
 434                                                 oseek = tfc_humanfsize(s, &stoi);
 435                                                 if (!str_empty(stoi)) {
 436                                                         oseek = tfc_fnamesize(s, YES);
 437                                                         oseek = tfc_modifysize(oseek, strchr(s, ':'));
 438                                                         if (oseek == NOFSIZE) xerror(NO, YES, YES,
 439                                                         "%s: invalid oseek value", s);
 440                                                 }
 441                                                 else oseek = tfc_modifysize(oseek, strchr(s, ':'));
 442                                         }
 443                                         else if (!strncmp(s, "count", 5) && *(s+5) == '=') {
 444                                                 s += 6;
 445                                                 maxlen = tfc_humanfsize(s, &stoi);
 446                                                 if (!str_empty(stoi)) {
 447                                                         maxlen = tfc_fnamesize(s, YES);
 448                                                         maxlen = tfc_modifysize(maxlen, strchr(s, ':'));
 449                                                         if (maxlen == NOFSIZE) xerror(NO, YES, YES,
 450                                                         "%s: invalid count value", s);
 451                                                 }
 452                                                 else maxlen = tfc_modifysize(maxlen, strchr(s, ':'));
 453                                                 if (counter_opt == TFC_CTR_HEAD)
 454                                                         maxlen += TF_BLOCK_SIZE;
 455                                         }
 456                                         else if (!strncmp(s, "ftrunc", 6) && *(s+6) == '=') {
 457                                                 s += 7;
 458                                                 if (!strcmp(s, "tail")) {
 459                                                         do_ftrunc = TFC_FTRUNC_TAIL;
 460                                                         ftrunc_dfd = NOFSIZE;
 461                                                 }
 462                                                 else {
 463                                                         do_ftrunc = TFC_DO_FTRUNC;
 464                                                         ftrunc_dfd = tfc_humanfsize(s, &stoi);
 465                                                         if (!str_empty(stoi)) {
 466                                                                 ftrunc_dfd = tfc_fnamesize(s, YES);
 467                                                                 ftrunc_dfd = tfc_modifysize(ftrunc_dfd, strchr(s, ':'));
 468                                                                 if (ftrunc_dfd == NOFSIZE) xerror(NO, YES, YES,
 469                                                                 "%s: invalid ftrunc value", s);
 470                                                         }
 471                                                         else ftrunc_dfd = tfc_modifysize(ftrunc_dfd, strchr(s, ':'));
 472                                                 }
 473                                         }
 474                                         else if (!strncmp(s, "xkey", 4) && *(s+4) == '=') {
 475                                                 s += 5;
 476                                                 maxkeylen = tfc_humanfsize(s, &stoi);
 477                                                 if (!str_empty(stoi)) {
 478                                                         maxkeylen = tfc_fnamesize(s, YES);
 479                                                         maxkeylen = tfc_modifysize(maxkeylen, strchr(s, ':'));
 480                                                         if (maxkeylen == NOSIZE)
 481                                                                 xerror(NO, YES, YES,
 482                                                                 "%s: invalid key length value", s);
 483                                                 }
 484                                                 else maxkeylen = tfc_modifysize(maxkeylen, strchr(s, ':'));
 485                                         }
 486                                         else if (!strncmp(s, "okey", 4) && *(s+4) == '=') {
 487                                                 s += 5;
 488                                                 keyoffset = tfc_humanfsize(s, &stoi);
 489                                                 if (!str_empty(stoi)) {
 490                                                         keyoffset = tfc_fnamesize(s, YES);
 491                                                         keyoffset = tfc_modifysize(keyoffset, strchr(s, ':'));
 492                                                         if (keyoffset == NOFSIZE)
 493                                                                 xerror(NO, YES, YES,
 494                                                                 "%s: invalid key offset value", s);
 495                                                 }
 496                                                 else keyoffset = tfc_modifysize(keyoffset, strchr(s, ':'));
 497                                         }
 498                                         else if (!strncmp(s, "xctr", 4) && *(s+4) == '=') {
 499                                                 s += 5;
 500                                                 ctrsz = tfc_humanfsize(s, &stoi);
 501                                                 if (!str_empty(stoi)) {
 502                                                         ctrsz = (size_t)tfc_fnamesize(s, YES);
 503                                                         ctrsz = (size_t)tfc_modifysize((tfc_fsize)ctrsz, strchr(s, ':'));
 504                                                         if (ctrsz == NOSIZE)
 505                                                                 xerror(NO, YES, YES,
 506                                                                 "%s: invalid counter length value", s);
 507                                                 }
 508                                                 else ctrsz = (size_t)tfc_modifysize((tfc_fsize)ctrsz, strchr(s, ':'));
 509                                                 if (ctrsz > TF_BLOCK_SIZE)
 510                                                         xerror(NO, YES, YES, "%s: counter size cannot exceed TF block size", s);
 511                                         }
 512                                         else xerror(NO, YES, YES, "invalid option %s", s);
 513                                 }
 514                                 break;
 515                         case 'S':
 516                                 do_mac = TFC_MAC_SIGN;
 517                                 if (strcasecmp(optarg, "mac") != 0)
 518                                         do_mac_file = optarg;
 519                                 break;
 520                         case 'M':
 521                                 do_mac = TFC_MAC_VRFY;
 522                                 if (!strcasecmp(optarg, "drop"))
 523                                         do_mac = TFC_MAC_DROP;
 524                                 else if (strcasecmp(optarg, "mac") != 0)
 525                                         do_mac_file = optarg;
 526                                 break;
 527                         case 'm':
 528                         case 'u':
 529                                 if (do_mac != TFC_MAC_VRFY)
 530                                         xerror(NO, YES, YES, "signature source was not specified");
 531                                 do_mac = TFC_MAC_JUST_VRFY;
 532                                 if (c == 'u') do_mac = TFC_MAC_JUST_VRFY2;
 533                                 break;
 534                         case 'R':
 535                         case 'Z':
 536                                 if (maxlen != NOFSIZE) {
 537                                         if (c == 'Z') genzero_nr_bytes = maxlen;
 538                                         else genrandom_nr_bytes = maxlen;
 539                                 }
 540                                 else {
 541                                         tfc_fsize t;
 542                                         if (!strcasecmp(optarg, "cbs"))
 543                                                 t = TF_BLOCK_SIZE;
 544                                         else if (!strcasecmp(optarg, "ks"))
 545                                                 t = TF_FROM_BITS(TFC_KEY_BITS);
 546                                         else if (!strcasecmp(optarg, "xks"))
 547                                                 t = TF_FROM_BITS(TFC_KEY_BITS) * 2;
 548                                         else if (!strcasecmp(optarg, "iobs"))
 549                                                 t = blksize;
 550                                         else {
 551                                                 t = tfc_humanfsize(optarg, &stoi);
 552                                                 if (!str_empty(stoi)) {
 553                                                         t = tfc_fnamesize(optarg, NO);
 554                                                         t = tfc_modifysize(t, strchr(optarg, ':'));
 555                                                 }
 556                                                 else t = tfc_modifysize(t, strchr(optarg, ':'));
 557                                         }
 558                                         if (c == 'Z') genzero_nr_bytes = maxlen = t;
 559                                         else genrandom_nr_bytes = maxlen = t;
 560                                 }
 561                                 break;
 562                         case 'a':
 563                                 do_preserve_time = YES;
 564                                 break;
 565                         case 'A':
 566                                 do_outfmt = TFC_OUTFMT_B64;
 567                                 break;
 568                         case 'W':
 569                                 do_outfmt = TFC_OUTFMT_RAW;
 570                                 break;
 571                         case 'H':
 572                                 do_outfmt = TFC_OUTFMT_HEX;
 573                                 break;
 574                         case 'q':
 575                                 quiet = YES;
 576                                 verbose = NO;
 577                                 do_full_hexdump = NO;
 578                                 status_timer = 0;
 579                                 break;
 580                         case 'v':
 581                                 verbose = YES;
 582                                 break;
 583                         case 'V':
 584                                 td = strtod(optarg, &stoi);
 585                                 status_timer = TFC_DTOUSECS(td);
 586                                 if (status_timer <= TFC_DTOUSECS(0) || !str_empty(stoi)) status_timer = 0;
 587                                 break;
 588                         default:
 589                                 usage();
 590                                 break;
 591                 }
 592         }
 593
 594         if (!strcmp(progname, "tfbench")) {
 595                 if (!*(argv+optind)) usage();
 596
 597                 td = strtod(*(argv+optind), &stoi);
 598                 if (td <= TFC_DTOUSECS(0) || !str_empty(stoi))
 599                         xerror(NO, YES, YES,
 600                         "%s: invalid benchmark time in seconds", *(argv+optind));
 601                 bench_timer = TFC_DTOUSECS(td);
 602                 do_benchmark(bench_timer, td);
 603         }
 604         if (genrandom_nr_bytes) {
 605                 ctr_mode = TFC_MODE_STREAM;
 606                 do_edcrypt = TFC_DO_ENCRYPT;
 607                 gen_write_bytes(*(argv+optind), oseek, genrandom_nr_bytes);
 608         }
 609         if (genzero_nr_bytes) {
 610                 ctr_mode = TFC_MODE_PLAIN;
 611                 do_edcrypt = TFC_DO_PLAIN;
 612                 gen_write_bytes(*(argv+optind), oseek, genzero_nr_bytes);
 613         }
 614
 615         if (rawkey && password)
 616                 xerror(NO, YES, YES, "Cannot use rawkey and hashing password!");
 617         if (do_edcrypt == TFC_DO_ENCRYPT && do_mac >= TFC_MAC_VRFY)
 618                 xerror(NO, YES, YES, "Cannot encrypt and verify signature!");
 619         if (do_edcrypt == TFC_DO_DECRYPT && do_mac == TFC_MAC_SIGN)
 620                 xerror(NO, YES, YES, "Cannot decrypt and calculate signature!");
 621         if (do_edcrypt == TFC_DO_DECRYPT && counter_opt == TFC_CTR_RAND)
 622                 xerror(NO, YES, YES, "Cannot decrypt and embed a generated CTR into file!");
 623         if (do_edcrypt == TFC_DO_ENCRYPT && counter_opt == TFC_CTR_HEAD)
 624                 xerror(NO, YES, YES, "Cannot encrypt and read CTR from source!");
 625         if (overwrite_source && counter_opt == TFC_CTR_RAND)
 626                 xerror(NO, YES, YES, "Cannot embed a CTR into file when overwriting it!");
 627         if (ctr_mode == TFC_MODE_PLAIN
 628         && (do_edcrypt || do_mac || rawkey
 629         || mackey_opt || counter_opt || counter_file))
 630                 xerror(NO, YES, YES, "Encryption facility is disabled when in plain IO mode.");
 631
 632         errno = 0;
 633         do_stop = NO;
 634
 635         if (saltf) {
 636                 int saltfd;
 637
 638                 memset(tfc_salt, 0, TFC_MAX_SALT);
 639                 tfc_saltsz = 0;
 640                 if (!strcasecmp(saltf, "disable")) goto _nosalt;
 641
 642                 if (!strcmp(saltf, "-")) saltfd = 0;
 643                 else saltfd = open(saltf, O_RDONLY | O_LARGEFILE);
 644                 if (saltfd == -1) xerror(NO, NO, YES, "%s", saltf);
 645                 lio = xread(saltfd, tfc_salt, TFC_MAX_SALT - TF_FROM_BITS(TFC_KEY_BITS));
 646                 if (lio == NOSIZE) xerror(NO, NO, YES, "%s", saltf);
 647                 tfc_saltsz = lio;
 648                 xclose(saltfd);
 649         }
 650
 651 _nosalt:
 652         if (mackey_opt == TFC_MACKEY_FILE && mackeyf) {
 653                 int mkfd = -1;
 654                 tfc_yesno do_stop;
 655
 656                 if (!strcmp(mackeyf, "-")) mkfd = 0;
 657                 else mkfd = open(mackeyf, O_RDONLY | O_LARGEFILE);
 658                 if (mkfd == -1) xerror(NO, NO, YES, "%s", mackeyf);
 659
 660                 skein_init(&sk, TFC_KEY_BITS);
 661
 662                 do_stop = NO;
 663                 while (1) {
 664                         if (do_stop) break;
 665                         pblk = tmpdata;
 666                         ldone = 0;
 667                         lrem = lblock = sizeof(tmpdata);
 668                         if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(mkfd);
 669 _mkragain:              lio = xread(mkfd, pblk, lrem);
 670                         if (lio == 0 && do_stop == NO) do_stop = YES;
 671                         if (lio != NOSIZE) ldone += lio;
 672                         else {
 673                                 if (errno != EIO && catch_all_errors != YES)
 674                                         xerror(NO, NO, NO, "%s", mackeyf);
 675                                 switch (error_action) {
 676                                         case TFC_ERRACT_CONT: xerror(YES, NO, NO, "%s", mackeyf); goto _mkragain; break;
 677                                         case TFC_ERRACT_SYNC:
 678                                         case TFC_ERRACT_LSYNC:
 679                                                 xerror(YES, NO, NO, "%s", mackeyf);
 680                                                 lio = ldone = lrem = lblock;
 681                                                 memset(tmpdata, 0, lio);
 682                                                 if (rdpos == NOFSIZE) lseek(mkfd, lio, SEEK_CUR);
 683                                                 else lseek(mkfd, rdpos + lio, SEEK_SET);
 684                                                 break;
 685                                         default: xerror(NO, NO, NO, "%s", mackeyf); break;
 686                                 }
 687                         }
 688                         if (lio && lio < lrem) {
 689                                 pblk += lio;
 690                                 lrem -= lio;
 691                                 goto _mkragain;
 692                         }
 693
 694                         skein_update(&sk, tmpdata, ldone);
 695                 }
 696
 697                 skein_final(mackey, &sk);
 698
 699                 xclose(mkfd);
 700         }
 701         else if (mackey_opt == TFC_MACKEY_PASSWORD) {
 702                 memset(&getps, 0, sizeof(struct getpasswd_state));
 703                 getps.fd = getps.efd = -1;
 704                 getps.passwd = pwdask;
 705                 getps.pwlen = sizeof(pwdask)-1;
 706                 getps.echo = mac_pw_prompt ? mac_pw_prompt : "Enter MAC password: ";
 707                 getps.charfilter = (show_secrets == YES) ? getps_plain_filter : getps_filter;
 708                 getps.maskchar = (show_secrets == YES) ? 0 : 'x';
 709                 getps.flags = GETP_WAITFILL;
 710                 n = xgetpasswd(&getps);
 711                 if (n == NOSIZE) xerror(NO, NO, YES, "getting MAC password");
 712                 if (n == ((size_t)-2)) xexit(1);
 713                 if (verbose) say_hint(pwdask, n, "MAC password hint");
 714                 skein(mackey, TF_MAX_BITS, NULL, pwdask, n);
 715         }
 716
 717
 718         if ((strlen(progname) <= 9)
 719         && ((!strcmp(progname, "sksum"))
 720         || ((!memcmp(progname, "sk", 2))
 721         && (!memcmp(progname+3, "sum", 3)
 722         || !memcmp(progname+4, "sum", 3)
 723         || !memcmp(progname+5, "sum", 3)
 724         || !memcmp(progname+6, "sum", 3)))))
 725                 do_sksum(progname, argv+optind);
 726         if (!strcmp(progname, "tfbase64")) do_edbase64(argv+optind);
 727
 728         idx = optind;
 729
 730         if (argv[idx]) {
 731                 if (password || rawkey > TFC_RAWKEY_KEYFILE) goto _nokeyfd;
 732                 if (!strcmp(argv[idx], "-")) kfd = 0;
 733                 else kfd = open(argv[idx], O_RDONLY | O_LARGEFILE);
 734                 if (kfd == -1) xerror(NO, NO, YES, "%s", argv[idx]);
 735
 736                 lio = strnlen(argv[idx], PATH_MAX);
 737                 memset(argv[idx], '*', lio);
 738
 739                 idx++;
 740         }
 741         else password = YES;
 742
 743         errno = 0;
 744         if (do_full_key == NO && tweakf) {
 745                 int twfd;
 746
 747                 if (!strcmp(tweakf, "-")) twfd = 0;
 748                 else twfd = open(tweakf, O_RDONLY | O_LARGEFILE);
 749                 if (twfd == -1) xerror(NO, NO, YES, "%s", tweakf);
 750                 lio = ldone = xread(twfd, tweak, TF_TWEAK_SIZE);
 751                 if (lio == NOSIZE) xerror(NO, NO, YES, "%s", tweakf);
 752                 if (ldone < TF_TWEAK_SIZE)
 753                         xerror(NO, NO, YES, "%s: %zu bytes tweak required", tweakf, TF_TWEAK_SIZE);
 754                 xclose(twfd);
 755         }
 756
 757 _nokeyfd:
 758         errno = 0;
 759         if (argv[idx]) {
 760                 if (!strcmp(argv[idx], "-") && kfd) sfd = 0;
 761                 else {
 762                         sfd = open(argv[idx], O_RDONLY | O_LARGEFILE);
 763                         if (do_preserve_time) if (fstat(sfd, &s_stat) == -1)
 764                                 xerror(YES, NO, YES, "stat(%s)", argv[idx]);
 765                 }
 766                 if (sfd == -1) xerror(NO, NO, YES, "%s", argv[idx]);
 767
 768                 if (do_edcrypt == TFC_DO_DECRYPT && do_mac != NO && maxlen != NOFSIZE) {
 769                         if (verbose) tfc_esay("%s: disabling signature verification on "
 770                                 "requested partial decryption.", progname);
 771                         do_mac = NO;
 772                 }
 773
 774                 if ((do_mac >= TFC_MAC_VRFY || do_mac == TFC_MAC_DROP) && !do_mac_file) {
 775                         maxlen = tfc_fdsize(sfd);
 776                         if (maxlen == NOFSIZE)
 777                                 xerror(NO, YES, YES,
 778                                 "Cannot verify embedded MAC with non-seekable source!");
 779                         maxlen -= TF_FROM_BITS(macbits);
 780                 }
 781                 srcfname = argv[idx];
 782                 idx++;
 783         }
 784
 785         if (!do_mac_file && (do_mac >= TFC_MAC_VRFY && sfd == 0))
 786                 xerror(NO, YES, YES, "Cannot verify embedded MAC with non-seekable source!");
 787
 788         if (ctrsz == NOSIZE) ctrsz = TF_BLOCK_SIZE;
 789         if (ctrsz > TF_BLOCK_SIZE) ctrsz = TF_BLOCK_SIZE;
 790
 791         if (ctr_mode == TFC_MODE_ECB) goto _ctrskip1;
 792         errno = 0;
 793         if (counter_file) {
 794                 int ctrfd;
 795
 796                 if (!strcmp(counter_file, "-")) ctrfd = 0;
 797                 else ctrfd = open(counter_file, O_RDONLY | O_LARGEFILE);
 798                 if (ctrfd == -1) xerror(NO, NO, YES, "%s", counter_file);
 799                 lio = xread(ctrfd, ctr, ctrsz);
 800                 if (lio == NOSIZE) xerror(NO, NO, YES, "%s", counter_file);
 801                 if (lio < ctrsz) xerror(NO, YES, YES, "counter file is too small (%zu)!", lio);
 802                 xclose(ctrfd);
 803         }
 804         else if (counter_opt == TFC_CTR_HEAD) {
 805                 pblk = ctr;
 806                 ldone = 0;
 807                 lrem = lblock = ctrsz;
 808                 if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(sfd);
 809 _ctrragain:     lio = xread(sfd, pblk, lrem);
 810                 if (lio != NOSIZE) ldone += lio;
 811                 else {
 812                         if (errno != EIO && catch_all_errors != YES)
 813                                 xerror(NO, NO, NO, "%s", srcfname);
 814                         switch (error_action) {
 815                                 case TFC_ERRACT_CONT: xerror(YES, NO, NO, "%s", srcfname); goto _ctrragain; break;
 816                                 case TFC_ERRACT_SYNC:
 817                                 case TFC_ERRACT_LSYNC:
 818                                         xerror(YES, NO, NO, "%s", srcfname);
 819                                         lio = ldone = lrem = lblock;
 820                                         memset(ctr, 0, lio);
 821                                         if (rdpos == NOFSIZE) lseek(sfd, lio, SEEK_CUR);
 822                                         else lseek(sfd, rdpos + lio, SEEK_SET);
 823                                         break;
 824                                 default: xerror(NO, NO, NO, "%s", srcfname); break;
 825                         }
 826                 }
 827                 if (lio && lio < lrem) {
 828                         pblk += lio;
 829                         lrem -= lio;
 830                         goto _ctrragain;
 831                 }
 832                 total_processed_src += ldone;
 833         }
 834
 835 _ctrskip1:
 836         if (iseek) {
 837                 if (counter_opt == TFC_CTR_HEAD && ctr_mode != TFC_MODE_ECB)
 838                         iseek += ctrsz;
 839                 if (lseek(sfd, iseek, SEEK_SET) == -1)
 840                         xerror(ignore_seek_errors, NO, NO, "%s: seek failed", srcfname);
 841         }
 842
 843         if (ctr_mode == TFC_MODE_PLAIN) goto _plain;
 844
 845         if (verbose) tfc_esay("%s: hashing password", progname);
 846
 847         if (rawkey == TFC_RAWKEY_KEYFILE) {
 848                 tfc_yesno xtskeyset = NO;
 849
 850                 pblk = key;
 851 _xts2key:       ldone = 0;
 852                 lrem = lblock = TF_FROM_BITS(TFC_KEY_BITS);
 853                 if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(kfd);
 854 _keyragain:     lio = xread(kfd, pblk, lrem);
 855                 if (lio != NOSIZE) ldone += lio;
 856                 else {
 857                         if (errno != EIO && catch_all_errors != YES)
 858                                 xerror(NO, NO, NO, "reading key");
 859                         switch (error_action) {
 860                                 case TFC_ERRACT_CONT: xerror(YES, NO, NO, "reading key"); goto _keyragain; break;
 861                                 case TFC_ERRACT_SYNC:
 862                                 case TFC_ERRACT_LSYNC:
 863                                         xerror(YES, NO, NO, "reading key");
 864                                         lio = ldone = lrem = lblock;
 865                                         memset(key, 0, lio);
 866                                         if (rdpos == NOFSIZE) lseek(kfd, lio, SEEK_CUR);
 867                                         else lseek(kfd, rdpos + lio, SEEK_SET);
 868                                         break;
 869                                 default: xerror(NO, NO, NO, "reading key"); break;
 870                         }
 871                 }
 872                 if (lio && lio < lrem) {
 873                         pblk += lio;
 874                         lrem -= lio;
 875                         goto _keyragain;
 876                 }
 877                 if (ldone < lblock) xerror(NO, YES, YES, "rawkey too small! (%zu)", ldone);
 878
 879                 if (ctr_mode == TFC_MODE_XTS) {
 880                         if (xtskeyset == NO) {
 881                                 pblk = xtskey;
 882                                 xtskeyset = YES;
 883                                 goto _xts2key;
 884                         }
 885                 }
 886         }
 887         else if (rawkey == TFC_RAWKEY_ASKSTR) {
 888                 tfc_yesno xtskeyset = NO;
 889
 890                 pblk = key; n = sizeof(key);
 891 _xts2keyaskstr: memset(&getps, 0, sizeof(struct getpasswd_state));
 892                 getps.fd = getps.efd = -1;
 893                 getps.passwd = (char *)pblk;
 894                 getps.pwlen = n;
 895                 getps.echo = pw_prompt ? pw_prompt : "Enter rawkey (str): ";
 896                 getps.charfilter = (show_secrets == YES) ? getps_plain_filter : getps_filter;
 897                 getps.maskchar = (show_secrets == YES) ? 0 : 'x';
 898                 getps.flags = GETP_WAITFILL;
 899                 n = xgetpasswd(&getps);
 900                 if (n == NOSIZE) xerror(NO, NO, YES, "getting string rawkey");
 901                 if (n == ((size_t)-2)) xexit(1);
 902                 if (verbose) say_hint(pblk, n, "Raw string key hint");
 903                 if (ctr_mode == TFC_MODE_XTS) {
 904                         if (xtskeyset == NO) {
 905                                 pblk = xtskey; n = sizeof(xtskey);
 906                                 xtskeyset = YES;
 907                                 goto _xts2keyaskstr;
 908                         }
 909                 }
 910         }
 911         else if (rawkey == TFC_RAWKEY_ASKHEX) {
 912                 tfc_yesno xtskeyset = NO;
 913
 914                 pblk = key;
 915 _rawkey_hex_again:
 916                 memset(&getps, 0, sizeof(struct getpasswd_state));
 917                 getps.fd = getps.efd = -1;
 918                 getps.passwd = pwdask;
 919                 getps.pwlen = (TF_FROM_BITS(TFC_KEY_BITS)*2);
 920                 getps.echo = pw_prompt ? pw_prompt : "Enter rawkey (hex): ";
 921                 getps.charfilter = (show_secrets == YES) ? getps_plain_hex_filter : getps_hex_filter;
 922                 getps.maskchar = (show_secrets == YES) ? 0 : 'x';
 923                 getps.flags = GETP_WAITFILL;
 924                 n = xgetpasswd(&getps);
 925                 if (n == NOSIZE) xerror(NO, NO, YES, "getting hex rawkey");
 926                 if (n == ((size_t)-2)) xexit(1);
 927                 if (n % 2) {
 928                         tfc_esay("Please input even number of hex digits!");
 929                         goto _rawkey_hex_again;
 930                 }
 931                 hex2bin(pblk, pwdask);
 932                 memset(pwdask, 0, sizeof(pwdask));
 933                 if (verbose) say_hint(pblk, n/2, "Raw hex key hint");
 934                 if (ctr_mode == TFC_MODE_XTS) {
 935                         if (xtskeyset == NO) {
 936                                 pblk = xtskey;
 937                                 xtskeyset = YES;
 938                                 goto _rawkey_hex_again;
 939                         }
 940                 }
 941         }
 942         else if (password) {
 943 _pwdagain:      memset(&getps, 0, sizeof(struct getpasswd_state));
 944                 getps.fd = getps.efd = -1;
 945                 getps.passwd = pwdask;
 946                 getps.pwlen = sizeof(pwdask)-1;
 947                 getps.echo = pw_prompt ? pw_prompt : "Enter password: ";
 948                 getps.charfilter = (show_secrets == YES) ? getps_plain_filter : getps_filter;
 949                 getps.maskchar = (show_secrets == YES) ? 0 : 'x';
 950                 getps.flags = GETP_WAITFILL;
 951                 n = xgetpasswd(&getps);
 952                 if (n == NOSIZE) xerror(NO, NO, YES, "getting password");
 953                 if (n == ((size_t)-2)) xexit(1);
 954                 if (do_edcrypt == TFC_DO_ENCRYPT && no_repeat == NO) {
 955                         getps.fd = getps.efd = -1;
 956                         getps.passwd = pwdagain;
 957                         getps.pwlen = sizeof(pwdagain)-1;
 958                         getps.echo = "Enter it again: ";
 959                         getps.flags = GETP_WAITFILL;
 960                         n = xgetpasswd(&getps);
 961                         if (n == NOSIZE) xerror(NO, NO, YES, "getting password again");
 962                         if (n == ((size_t)-2)) xexit(1);
 963                         if (strncmp(pwdask, pwdagain, sizeof(pwdagain)-1) != 0) {
 964                                 tfc_esay("Passwords are different, try again");
 965                                 goto _pwdagain;
 966                         }
 967                 }
 968                 if (verbose) say_hint(pwdask, n, "Password hint");
 969                 skein(key, TFC_KEY_BITS, mackey_opt ? mackey : NULL, pwdask, n);
 970                 memset(pwdask, 0, sizeof(pwdask));
 971                 memset(pwdagain, 0, sizeof(pwdagain));
 972         }
 973         else {
 974                 if (skeinfd(key, TFC_KEY_BITS, mackey_opt ? mackey : NULL, kfd, keyoffset, maxkeylen) != YES)
 975                         xerror(NO, NO, YES, "hashing key");
 976         }
 977
 978         if (rawkey == NO) {
 979                 if (tfc_saltsz > 0) {
 980                         memcpy(tfc_salt+tfc_saltsz, key, TF_FROM_BITS(TFC_KEY_BITS));
 981                         skein(key, TFC_KEY_BITS, mackey_opt ? mackey : NULL, tfc_salt, tfc_saltsz+TF_FROM_BITS(TFC_KEY_BITS));
 982                 }
 983                 if (nr_turns > 1) for (x = 0; x < nr_turns; x++)
 984                         skein(key, TFC_KEY_BITS, mackey_opt ? mackey : NULL, key, TF_FROM_BITS(TFC_KEY_BITS));
 985                 memset(tfc_salt, 0, TFC_MAX_SALT);
 986         }
 987
 988         if (ctr_mode == TFC_MODE_XTS && rawkey == NO) {
 989                 skein(xtskey, TF_NR_KEY_BITS, mackey_opt ? mackey : NULL, key, TF_FROM_BITS(TFC_KEY_BITS));
 990         }
 991
 992         if (genkeyf) {
 993                 int krfd;
 994                 tfc_yesno xtskeyset = NO;
 995
 996                 pblk = key;
 997                 if (!strcmp(genkeyf, "-")) krfd = 1;
 998                 else krfd = open(genkeyf, O_WRONLY | O_CREAT | O_LARGEFILE | write_flags, 0666);
 999                 if (krfd == -1) xerror(NO, NO, YES, "%s", genkeyf);
1000 _xts2genkey:    if (xwrite(krfd, pblk, TF_FROM_BITS(TFC_KEY_BITS)) == NOSIZE) xerror(NO, NO, YES, "%s", genkeyf);
1001                 if (do_fsync && fsync(krfd) == -1) xerror(NO, NO, YES, "%s", genkeyf);
1002                 if (verbose && xtskeyset == NO) {
1003                         tfc_esay("%s: password hashing done", progname);
1004                         tfc_esay("%s: rawkey written to %s.", progname, genkeyf);
1005                         tfc_esay("%s: Have a nice day!", progname);
1006                 }
1007
1008                 if (ctr_mode == TFC_MODE_XTS) {
1009                         if (xtskeyset == NO) {
1010                                 pblk = xtskey;
1011                                 xtskeyset = YES;
1012                                 goto _xts2genkey;
1013                         }
1014                 }
1015
1016                 fchmod(krfd, 0600);
1017                 xclose(krfd);
1018                 xexit(0);
1019         }
1020
1021         if (iseek_blocks && (do_edcrypt == TFC_DO_DECRYPT && do_mac != NO)) {
1022                 if (verbose) tfc_esay("%s: disabling signature verification on "
1023                         "requested partial decryption.", progname);
1024                 do_mac = NO;
1025         }
1026
1027         if (do_mac != NO) {
1028                 if (mackey_opt == TFC_MACKEY_RAWKEY) skein(mackey, TF_MAX_BITS, key, key, TF_FROM_BITS(TFC_KEY_BITS));
1029                 if (ctr_mode < TFC_MODE_OCB) {
1030                         if (verbose) tfc_esay("%s: doing MAC calculation, processing speed "
1031                                 "will be slower.", progname);
1032                         if (mackey_opt) skein_init_key(&sk, mackey, macbits);
1033                         else skein_init(&sk, macbits);
1034                 }
1035         }
1036
1037         if (!counter_file && counter_opt <= TFC_CTR_SHOW && ctr_mode != TFC_MODE_ECB) {
1038                 skein(ctr, TF_TO_BITS(ctrsz), mackey_opt ? mackey : NULL, key, TF_FROM_BITS(TFC_KEY_BITS));
1039         }
1040
1041         tf_convkey(key);
1042         if (ctr_mode == TFC_MODE_XTS) tf_convkey(xtskey);
1043         if (do_full_key == NO) {
1044                 if (!tweakf) skein(tweak, TF_NR_TWEAK_BITS, NULL, key, TF_FROM_BITS(TFC_KEY_BITS));
1045                 tf_tweak_set(key, tweak);
1046         }
1047         if (ctr_mode == TFC_MODE_ECB) goto _ctrskip2;
1048
1049         if (counter_opt == TFC_CTR_ZERO) memset(ctr, 0, ctrsz);
1050
1051         tfc_data_to_words64(&iseek_blocks, sizeof(iseek_blocks));
1052         tf_ctr_set(ctr, &iseek_blocks, sizeof(iseek_blocks));
1053         if (do_mac == TFC_MAC_JUST_VRFY2) memcpy(svctr, ctr, TF_BLOCK_SIZE);
1054
1055         if (counter_opt == TFC_CTR_SHOW) {
1056                 switch (do_outfmt) {
1057                         case TFC_OUTFMT_B64: tfc_printbase64(stderr, ctr, ctrsz, YES); break;
1058                         case TFC_OUTFMT_RAW: xwrite(2, ctr, ctrsz); break;
1059                         case TFC_OUTFMT_HEX: mehexdump(ctr, ctrsz, ctrsz, YES); break;
1060                 }
1061         }
1062         else if (counter_opt == TFC_CTR_RAND) tfc_getrandom(ctr, ctrsz);
1063
1064 _ctrskip2:
1065         if (kfd != -1) {
1066                 xclose(kfd);
1067                 kfd = -1;
1068         }
1069         if (verbose) tfc_esay("%s: password hashing done", progname);
1070
1071         if (overwrite_source && srcfname) argv[idx] = srcfname;
1072
1073 _plain:
1074         if (argv[idx]) {
1075                 if (!strcmp(argv[idx], "-")) dfd = 1;
1076                 else dfd = open(argv[idx], O_RDWR | O_LARGEFILE | write_flags, 0666);
1077                 if (dfd == -1) {
1078                         dfd = open(argv[idx], O_WRONLY | O_CREAT | O_LARGEFILE | write_flags, 0666);
1079                         if (dfd == -1) xerror(NO, NO, YES, "%s", argv[idx]);
1080                 }
1081                 dstfname = argv[idx];
1082                 idx++;
1083         }
1084
1085         if (oseek) {
1086                 if (lseek(dfd, oseek, SEEK_SET) == -1)
1087                         xerror(ignore_seek_errors, NO, NO, "%s: seek failed", dstfname);
1088         }
1089
1090         for (x = 1; x < NSIG; x++) signal(x, SIG_IGN);
1091         memset(&sigact, 0, sizeof(sigact));
1092         sigact.sa_flags = SA_RESTART;
1093         sigact.sa_handler = print_crypt_status;
1094         sigaction(SIGUSR1, &sigact, NULL);
1095         sigaction(SIGALRM, &sigact, NULL);
1096         if (status_timer) setup_next_alarm(status_timer > 1000000 ? 1000000 : status_timer);
1097         sigact.sa_handler = change_status_width;
1098         sigaction(SIGQUIT, &sigact, NULL);
1099         sigact.sa_handler = change_status_timer;
1100         sigaction(SIGUSR2, &sigact, NULL);
1101         if (quiet == NO) {
1102                 sigact.sa_handler = print_crypt_status;
1103                 sigaction(SIGINT, &sigact, NULL);
1104                 sigaction(SIGTERM, &sigact, NULL);
1105                 sigaction(SIGTSTP, &sigact, NULL);
1106         }
1107         else {
1108                 sigact.sa_handler = exit_sigterm;
1109                 sigaction(SIGINT, &sigact, NULL);
1110                 sigaction(SIGTERM, &sigact, NULL);
1111                 sigact.sa_handler = handle_sigtstp;
1112                 sigaction(SIGTSTP, &sigact, NULL);
1113         }
1114         memset(&sigact, 0, sizeof(struct sigaction));
1115
1116         tfc_getcurtime(&delta_time);
1117
1118         errno = 0;
1119         if (counter_opt == TFC_CTR_RAND && ctr_mode != TFC_MODE_ECB) {
1120                 pblk = ctr;
1121                 lio = lrem = ctrsz;
1122                 ldone = 0;
1123 _ctrwagain:     lio = xwrite(dfd, pblk, lrem);
1124                 if (lio != NOSIZE) ldone += lio;
1125                 else xerror(NO, NO, NO, "%s", dstfname);
1126                 if (do_fsync && fsync(dfd) == -1) xerror(NO, NO, NO, "%s", dstfname);
1127                 if (lio < lrem) {
1128                         pblk += lio;
1129                         lrem -= lio;
1130                         goto _ctrwagain;
1131                 }
1132                 total_processed_dst += ldone;
1133                 delta_processed += ldone;
1134         }
1135
1136         if (ctr_mode == TFC_MODE_STREAM) tfe_init_iv(&tfe, key, ctr);
1137
1138         if (do_mac == TFC_MAC_JUST_VRFY2) {
1139                 rwd = tfc_fdgetpos(sfd);
1140                 if (rwd == NOFSIZE) {
1141                         tfc_esay("%s: WARNING: input is not seekable, disabling MAC testing mode", progname);
1142                         do_mac = TFC_MAC_VRFY;
1143                 }
1144                 goto _nodecrypt_again_vrfy2;
1145
1146 _decrypt_again_vrfy2:
1147                 if (lseek(sfd, (off_t)rwd, SEEK_SET) == ((off_t)-1)) {
1148                         xerror(ignore_seek_errors, NO, YES, "MAC testing seek failed");
1149                 }
1150                 total_processed_src = rwd;
1151                 memcpy(ctr, svctr, TF_BLOCK_SIZE);
1152                 memset(svctr, 0, TF_BLOCK_SIZE);
1153         }
1154
1155 _nodecrypt_again_vrfy2:
1156         errno = 0;
1157         do_stop = NO;
1158         while (1) {
1159                 if (do_stop) break;
1160                 pblk = srcblk;
1161                 ldone = 0;
1162                 lrem = lblock = blk_len_adj(maxlen, total_processed_src, blksize);
1163                 if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(sfd);
1164 _ragain:        lio = xread(sfd, pblk, lrem);
1165                 if (lio == 0) do_stop = YES;
1166                 if (lio != NOSIZE) ldone += lio;
1167                 else {
1168                         if (errno != EIO && catch_all_errors != YES)
1169                                 xerror(NO, NO, NO, "%s", srcfname);
1170                         switch (error_action) {
1171                                 case TFC_ERRACT_CONT: xerror(YES, NO, NO, "%s", srcfname); goto _ragain; break;
1172                                 case TFC_ERRACT_SYNC:
1173                                 case TFC_ERRACT_LSYNC:
1174                                         xerror(YES, NO, NO, "%s", srcfname);
1175                                         lio = ldone = lrem = lblock;
1176                                         memset(srcblk, 0, lio);
1177                                         if (rdpos == NOFSIZE) lseek(sfd, lio, SEEK_CUR);
1178                                         else lseek(sfd, rdpos + lio, SEEK_SET);
1179                                         break;
1180                                 default: xerror(NO, NO, NO, "%s", srcfname); break;
1181                         }
1182                 }
1183                 if (lio && lio < lrem) {
1184                         pblk += lio;
1185                         lrem -= lio;
1186                         goto _ragain;
1187                 }
1188                 total_processed_src += ldone;
1189
1190                 if (do_pad && (ldone % TF_BLOCK_SIZE)) {
1191                         size_t orig = ldone;
1192                         ldone += (TF_BLOCK_SIZE - (ldone % TF_BLOCK_SIZE));
1193                         if (ldone > blksize) ldone = blksize;
1194                         memset(srcblk+orig, 0, sizeof(srcblk)-orig);
1195                 }
1196
1197                 if (do_mac == TFC_MAC_SIGN && ctr_mode < TFC_MODE_OCB)
1198                         skein_update(&sk, srcblk, ldone);
1199
1200                 if (ctr_mode == TFC_MODE_CTR) tf_ctr_crypt(key, ctr, dstblk, srcblk, ldone);
1201                 else if (ctr_mode == TFC_MODE_STREAM) tf_stream_crypt(&tfe, dstblk, srcblk, ldone);
1202                 else if (ctr_mode == TFC_MODE_XTS && do_edcrypt == TFC_DO_ENCRYPT)
1203                         tf_xts_encrypt(key, xtskey, ctr, dstblk, srcblk, ldone, xtsblocks);
1204                 else if (ctr_mode == TFC_MODE_XTS && do_edcrypt == TFC_DO_DECRYPT)
1205                         tf_xts_decrypt(key, xtskey, ctr, dstblk, srcblk, ldone, xtsblocks);
1206                 else if (ctr_mode == TFC_MODE_ECB && do_edcrypt == TFC_DO_ENCRYPT)
1207                         tf_ecb_encrypt(key, dstblk, srcblk, ldone);
1208                 else if (ctr_mode == TFC_MODE_ECB && do_edcrypt == TFC_DO_DECRYPT)
1209                         tf_ecb_decrypt(key, dstblk, srcblk, ldone);
1210                 else if (ctr_mode == TFC_MODE_CBC && do_edcrypt == TFC_DO_ENCRYPT)
1211                         tf_cbc_encrypt(key, ctr, dstblk, srcblk, ldone);
1212                 else if (ctr_mode == TFC_MODE_CBC && do_edcrypt == TFC_DO_DECRYPT)
1213                         tf_cbc_decrypt(key, ctr, dstblk, srcblk, ldone);
1214
1215                 else if (ctr_mode == TFC_MODE_OCB && do_edcrypt == TFC_DO_ENCRYPT)
1216                         tf_ocb_encrypt(key, ctr, dstblk, do_mac == TFC_MAC_SIGN ? macresult : NULL, srcblk, ldone, xtsblocks);
1217                 else if (ctr_mode == TFC_MODE_OCB && do_edcrypt == TFC_DO_DECRYPT)
1218                         tf_ocb_decrypt(key, ctr, dstblk, do_mac >= TFC_MAC_VRFY ? macresult : NULL, srcblk, ldone, xtsblocks);
1219
1220                 else if (ctr_mode == TFC_MODE_PLAIN)
1221                         memcpy(dstblk, srcblk, ldone);
1222
1223                 if (do_mac >= TFC_MAC_VRFY && ctr_mode < TFC_MODE_OCB)
1224                         skein_update(&sk, dstblk, ldone);
1225                 if (do_mac >= TFC_MAC_JUST_VRFY) goto _nowrite;
1226
1227                 pblk = dstblk;
1228                 lrem = ldone;
1229                 ldone = 0;
1230 _wagain:        lio = xwrite(dfd, pblk, lrem);
1231                 if (lio != NOSIZE) ldone += lio;
1232                 else xerror(NO, NO, NO, "%s", dstfname);
1233                 if (do_fsync && fsync(dfd) == -1) xerror(NO, NO, NO, "%s", dstfname);
1234                 if (lio < lrem) {
1235                         pblk += lio;
1236                         lrem -= lio;
1237                         goto _wagain;
1238                 }
1239                 total_written_dst += ldone;
1240 _nowrite:       total_processed_dst += ldone;
1241                 delta_processed += ldone;
1242
1243                 if (maxlen != NOFSIZE && total_processed_src >= maxlen) {
1244                         do_stop = YES;
1245                         break;
1246                 }
1247         }
1248
1249         errno = 0;
1250         if (do_mac >= TFC_MAC_VRFY) {
1251                 if (!do_mac_file) {
1252                         pblk = macvrfy;
1253                         ldone = 0;
1254                         lrem = lblock = TF_FROM_BITS(macbits);
1255                         if (error_action == TFC_ERRACT_SYNC) rdpos = tfc_fdgetpos(sfd);
1256 _macragain:             lio = xread(sfd, pblk, lrem);
1257                         if (lio != NOSIZE) ldone += lio;
1258                         else {
1259                                 if (errno != EIO && catch_all_errors != YES)
1260                                         xerror(NO, NO, NO, "%s", srcfname);
1261                                 switch (error_action) {
1262                                         case TFC_ERRACT_CONT: xerror(YES, NO, NO, "%s", srcfname); goto _macragain; break;
1263                                         case TFC_ERRACT_SYNC:
1264                                         case TFC_ERRACT_LSYNC:
1265                                                 xerror(YES, NO, NO, "%s", srcfname);
1266                                                 lio = ldone = lrem = lblock;
1267                                                 memset(macvrfy, 0, lio);
1268                                                 if (rdpos == NOFSIZE) lseek(sfd, lio, SEEK_CUR);
1269                                                 else lseek(sfd, rdpos + lio, SEEK_SET);
1270                                                 break;
1271                                         default: xerror(NO, NO, NO, "%s", srcfname); break;
1272                                 }
1273                         }
1274                         if (lio && lio < lrem) {
1275                                 pblk += lio;
1276                                 lrem -= lio;
1277                                 goto _macragain;
1278                         }
1279                         total_processed_src += ldone;
1280                 }
1281                 else {
1282                         int mfd;
1283
1284                         if (!strcmp(do_mac_file, "-")) mfd = 0;
1285                         else mfd = open(do_mac_file, O_RDONLY | O_LARGEFILE);
1286                         if (mfd == -1) xerror(YES, NO, NO, "%s", do_mac_file);
1287                         lio = ldone = xread(mfd, tmpdata, sizeof(tmpdata));
1288                         if (lio == NOSIZE) xerror(NO, NO, YES, "%s", do_mac_file);
1289                         if (!memcmp(tmpdata, TFC_ASCII_TFC_MAC_FOURCC, TFC_ASCII_TFC_MAC_FOURCC_LEN)) {
1290                                 memmove(tmpdata, tmpdata+TFC_ASCII_TFC_MAC_FOURCC_LEN,
1291                                         sizeof(tmpdata)-TFC_ASCII_TFC_MAC_FOURCC_LEN);
1292                                 lio = TF_FROM_BITS(macbits);
1293                                 base64_decode((char *)macvrfy, lio, (char *)tmpdata, sizeof(tmpdata));
1294                         }
1295                         else memcpy(macvrfy, tmpdata, TF_FROM_BITS(macbits));
1296                         xclose(mfd);
1297                 }
1298
1299                 if (ldone < TF_FROM_BITS(macbits)) {
1300                         if (quiet == NO) tfc_esay("%s: short signature (%zu), "
1301                                 "not verifying", progname, ldone);
1302                         exitcode = 1;
1303                         goto _shortmac;
1304                 }
1305
1306                 if (ctr_mode < TFC_MODE_OCB) skein_final(macresult, &sk);
1307                 else skein(macresult, macbits, mackey, macresult, TF_FROM_BITS(macbits));
1308
1309                 if (ctr_mode == TFC_MODE_CTR) tf_ctr_crypt(key, ctr, tmpdata, macvrfy, TF_FROM_BITS(macbits));
1310                 else if (ctr_mode == TFC_MODE_STREAM) tf_stream_crypt(&tfe, tmpdata, macvrfy, TF_FROM_BITS(macbits));
1311                 else if (ctr_mode == TFC_MODE_XTS) tf_xts_decrypt(key, xtskey, ctr, tmpdata, macvrfy, TF_FROM_BITS(macbits), xtsblocks);
1312                 else if (ctr_mode == TFC_MODE_ECB) tf_ecb_decrypt(key, tmpdata, macvrfy, TF_FROM_BITS(macbits));
1313                 else if (ctr_mode == TFC_MODE_CBC) tf_cbc_decrypt(key, ctr, tmpdata, macvrfy, TF_FROM_BITS(macbits));
1314                 else if (ctr_mode == TFC_MODE_OCB) tf_ocb_decrypt(key, ctr, tmpdata, NULL, macvrfy, TF_FROM_BITS(macbits), xtsblocks);
1315
1316                 if (!memcmp(tmpdata, macresult, TF_FROM_BITS(macbits))) {
1317                         if (quiet == NO) {
1318                                 tfc_esay("%s: signature is good", progname);
1319                                 if (verbose) {
1320                                         if (do_outfmt == TFC_OUTFMT_B64) tfc_printbase64(stderr, macresult, TF_FROM_BITS(macbits), YES);
1321                                         else mehexdump(macresult, TF_FROM_BITS(macbits), TF_FROM_BITS(macbits), YES);
1322                                 }
1323                         }
1324                         if (do_mac == TFC_MAC_JUST_VRFY2) {
1325                                 if (verbose) tfc_esay("%s: -u: MAC signature is valid, proceeding with decrypting it again", progname);
1326                                 do_mac = TFC_MAC_DROP;
1327                                 goto _decrypt_again_vrfy2;
1328                         }
1329                 }
1330                 else {
1331                         if (quiet == NO) {
1332                                 tfc_esay("%s: signature is BAD: "
1333                                 "wrong password, key, mode, or file is not signed", progname);
1334                                 if (do_mac == TFC_MAC_JUST_VRFY2) tfc_esay("%s: -u: MAC signature is invalid, not decrypting it again", progname);
1335                         }
1336                         exitcode = 1;
1337                 }
1338
1339 _shortmac:      memset(macvrfy, 0, sizeof(macvrfy));
1340                 memset(macresult, 0, sizeof(macresult));
1341                 memset(tmpdata, 0, sizeof(tmpdata));
1342         }
1343
1344         else if (do_mac == TFC_MAC_SIGN) {
1345                 if (ctr_mode < TFC_MODE_OCB) skein_final(macresult, &sk);
1346                 else skein(macresult, macbits, mackey, macresult, TF_FROM_BITS(macbits));
1347
1348                 if (ctr_mode == TFC_MODE_CTR) tf_ctr_crypt(key, ctr, tmpdata, macresult, TF_FROM_BITS(macbits));
1349                 else if (ctr_mode == TFC_MODE_STREAM) tf_stream_crypt(&tfe, tmpdata, macresult, TF_FROM_BITS(macbits));
1350                 else if (ctr_mode == TFC_MODE_XTS) tf_xts_encrypt(key, xtskey, ctr, tmpdata, macresult, TF_FROM_BITS(macbits), xtsblocks);
1351                 else if (ctr_mode == TFC_MODE_ECB) tf_ecb_encrypt(key, tmpdata, macresult, TF_FROM_BITS(macbits));
1352                 else if (ctr_mode == TFC_MODE_CBC) tf_cbc_encrypt(key, ctr, tmpdata, macresult, TF_FROM_BITS(macbits));
1353                 else if (ctr_mode == TFC_MODE_OCB) tf_ocb_encrypt(key, ctr, tmpdata, NULL, macresult, TF_FROM_BITS(macbits), xtsblocks);
1354                 memset(macresult, 0, sizeof(macresult));
1355
1356                 if (!do_mac_file) {
1357                         pblk = tmpdata;
1358                         lio = lrem = TF_FROM_BITS(macbits);
1359                         ldone = 0;
1360 _macwagain:             lio = xwrite(dfd, pblk, lrem);
1361                         if (lio != NOSIZE) ldone += lio;
1362                         else xerror(NO, NO, NO, "%s", dstfname);
1363                         if (do_fsync && fsync(dfd) == -1) xerror(NO, NO, NO, "%s", dstfname);
1364                         if (lio < lrem) {
1365                                 pblk += lio;
1366                                 lrem -= lio;
1367                                 goto _macwagain;
1368                         }
1369                         total_processed_dst += ldone;
1370                         delta_processed += ldone;
1371                 }
1372                 else {
1373                         int mfd;
1374
1375                         if (!strcmp(do_mac_file, "-")) mfd = 1;
1376                         else mfd = open(do_mac_file, O_WRONLY | O_CREAT | O_LARGEFILE | write_flags, 0666);
1377                         if (mfd == -1) xerror(YES, NO, NO, "%s", do_mac_file);
1378                         if (do_outfmt == TFC_OUTFMT_B64) {
1379                                 memcpy(macvrfy, tmpdata, TF_FROM_BITS(macbits));
1380                                 memset(tmpdata, 0, TFC_TMPSIZE);
1381                                 memcpy(tmpdata, TFC_ASCII_TFC_MAC_FOURCC, TFC_ASCII_TFC_MAC_FOURCC_LEN);
1382                                 base64_encode((char *)tmpdata+TFC_ASCII_TFC_MAC_FOURCC_LEN, (char *)macvrfy, TF_FROM_BITS(macbits));
1383                                 lrem = strnlen((char *)tmpdata, sizeof(tmpdata));
1384                                 if (lrem) {
1385                                         tmpdata[lrem] = '\n';
1386                                         lrem++;
1387                                 }
1388                                 lio = xwrite(mfd, tmpdata, lrem);
1389                         }
1390                         else lio = xwrite(mfd, tmpdata, TF_FROM_BITS(macbits));
1391                         if (lio == NOSIZE) xerror(NO, NO, YES, "%s", do_mac_file);
1392                         if (do_fsync && fsync(mfd) == -1) xerror(NO, NO, YES, "%s", do_mac_file);
1393                         xclose(mfd);
1394                 }
1395
1396                 memset(macvrfy, 0, sizeof(macvrfy));
1397                 memset(macresult, 0, sizeof(macresult));
1398                 memset(tmpdata, 0, sizeof(tmpdata));
1399         }
1400
1401         if (verbose || status_timer || (do_stop == YES && quiet == NO)) print_crypt_status(0);
1402
1403         xexit(exitcode);
1404         return -1;
1405 }