2 * tfcrypt -- high security Threefish encryption tool.
4 * tfcrypt is copyrighted:
5 * Copyright (C) 2012-2018 Andrey Rys. All rights reserved.
7 * tfcrypt is licensed to you under the terms of std. MIT/X11 license:
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:
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
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.
31 static void get_urandom(const char *src, void *buf, size_t size)
37 if (src == NULL) fd = -1;
38 else fd = open(src, O_RDONLY);
40 if (fd == -1) fd = open("/dev/urandom", O_RDONLY);
41 if (fd == -1) fd = open("/dev/arandom", O_RDONLY);
42 if (fd == -1) fd = open("/dev/prandom", O_RDONLY);
43 if (fd == -1) fd = open("/dev/srandom", O_RDONLY);
44 if (fd == -1) fd = open("/dev/random", O_RDONLY);
45 if (fd == -1) xerror(NO, YES, YES, "random source is required (tried %s)", src);
47 _again: rd = xread(fd, ubuf, sz);
48 if (rd < sz && rd != NOSIZE) {
57 static tfc_yesno tfc_random_initialised;
59 static void tfc_initrandom(const char *rndsrc)
61 tfc_byte k[TF_KEY_SIZE];
63 if (tfc_random_initialised == YES) return;
65 get_urandom(rndsrc, k, TF_KEY_SIZE);
67 memset(k, 0, TF_KEY_SIZE);
69 tfc_random_initialised = YES;
72 void tfc_finirandom(void)
74 tf_prng_seedkey(NULL);
75 tfc_random_initialised = NO;
78 void tfc_getrandom(void *buf, size_t sz)
80 if (tfc_random_initialised == NO) tfc_initrandom(randsource);
81 tf_prng_genrandom(buf, sz);
84 void gen_write_bytes(const char *foutname, tfc_fsize offset, tfc_fsize nrbytes)
86 static tfc_fsize wrpos = NOFSIZE;
88 size_t lblock, lio, lrem;
91 for (x = 1; x < NSIG; x++) signal(x, SIG_IGN);
92 memset(&sigact, 0, sizeof(sigact));
93 sigact.sa_flags = SA_RESTART;
94 sigact.sa_handler = print_crypt_status;
95 sigaction(SIGUSR1, &sigact, NULL);
96 sigaction(SIGTSTP, &sigact, NULL);
97 sigaction(SIGALRM, &sigact, NULL);
98 if (status_timer) setup_next_alarm(status_timer);
99 sigact.sa_handler = change_status_width;
100 sigaction(SIGQUIT, &sigact, NULL);
101 sigact.sa_handler = change_status_timer;
102 sigaction(SIGUSR2, &sigact, NULL);
104 sigact.sa_handler = print_crypt_status;
105 sigaction(SIGINT, &sigact, NULL);
106 sigaction(SIGTERM, &sigact, NULL);
109 sigact.sa_handler = exit_sigterm;
110 sigaction(SIGINT, &sigact, NULL);
111 sigaction(SIGTERM, &sigact, NULL);
113 memset(&sigact, 0, sizeof(struct sigaction));
115 tfc_getcurtime(&delta_time);
117 if (do_less_stats) do_less_stats = NO;
118 else do_less_stats = YES;
122 foutname = TFC_STDOUT_NAME;
124 else if (!strcmp(foutname, "-")) {
126 foutname = TFC_STDOUT_NAME;
128 else fd = open(foutname, O_WRONLY | O_CREAT | O_LARGEFILE | write_flags, 0666);
129 if (fd == -1) xerror(NO, NO, YES, "%s", foutname);
132 if (lseek(fd, offset, SEEK_SET) == -1)
133 xerror(ignore_seek_errors, NO, NO, "%s: seek failed", foutname);
136 if (ctr_mode == TFC_MODE_PLAIN) memset(srcblk, 0, sizeof(srcblk));
138 if (verbose) tfc_nfsay(stderr, "%s: writing %lld bytes to %s ... ",
139 progname, nrbytes, foutname);
146 lblock = lrem = blk_len_adj(nrbytes, total_processed_src, blksize);
148 if (ctr_mode != TFC_MODE_PLAIN) tfc_getrandom(srcblk, lblock);
150 if (error_action == TFC_ERRACT_SYNC) wrpos = tfc_fdgetpos(fd);
151 _wagain: lio = xwrite(fd, pblk, lrem);
153 if (errno != EIO && catch_all_errors != YES)
154 xerror(NO, NO, YES, "%s", foutname);
155 switch (error_action) {
156 case TFC_ERRACT_CONT: xerror(YES, NO, YES, "%s", foutname); goto _wagain; break;
157 case TFC_ERRACT_SYNC:
158 case TFC_ERRACT_LSYNC:
159 xerror(YES, NO, YES, "%s", foutname);
160 if (wrpos == NOFSIZE) lseek(fd, lblock, SEEK_CUR);
161 else lseek(fd, wrpos + lblock, SEEK_SET);
163 default: xerror(NO, NO, YES, "%s", foutname); break;
166 if (do_fsync && fsync(fd) == -1) xerror(NO, NO, YES, "%s", foutname);
173 total_processed_src += lblock;
174 delta_processed += lblock;
175 total_processed_dst = total_processed_src;
176 if (total_processed_src >= nrbytes) break;
179 if (verbose) tfc_esay("done!");
180 if (verbose || status_timer) print_crypt_status(0);