2 * tfcrypt -- high security Threefish encryption tool.
4 * tfcrypt is copyrighted:
5 * Copyright (C) 2012-2019 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 print_crypt_status_genrnd(int signal)
33 print_crypt_status(signal);
36 static void exit_sigterm_genrnd(int signal)
41 static void get_urandom(const char *src, void *buf, size_t size)
47 if (src == NULL) fd = -1;
48 else fd = open(src, O_RDONLY);
50 if (fd == -1) fd = open("/dev/urandom", O_RDONLY);
51 if (fd == -1) fd = open("/dev/arandom", O_RDONLY);
52 if (fd == -1) fd = open("/dev/prandom", O_RDONLY);
53 if (fd == -1) fd = open("/dev/srandom", O_RDONLY);
54 if (fd == -1) fd = open("/dev/random", O_RDONLY);
55 if (fd == -1) xerror(NO, YES, YES, "random source is required (tried %s)", src);
57 _again: rd = xread(fd, ubuf, sz);
58 if (rd < sz && rd != NOSIZE) {
67 static tfc_yesno tfc_random_initialised;
69 static void tfc_initrandom(const char *rndsrc)
71 tfc_byte k[TF_KEY_SIZE];
73 if (tfc_random_initialised == YES) return;
75 get_urandom(rndsrc, k, TF_KEY_SIZE);
77 memset(k, 0, TF_KEY_SIZE);
79 tfc_random_initialised = YES;
82 void tfc_finirandom(void)
84 tf_prng_seedkey(NULL);
85 tfc_random_initialised = NO;
88 void tfc_getrandom(void *buf, size_t sz)
90 if (tfc_random_initialised == NO) tfc_initrandom(randsource);
91 tf_prng_genrandom(buf, sz);
94 void gen_write_bytes(const char *foutname, tfc_fsize offset, tfc_fsize nrbytes)
96 static tfc_fsize wrpos = NOFSIZE;
98 size_t lblock, lio, lrem;
101 for (x = 1; x < NSIG; x++) signal(x, SIG_IGN);
102 memset(&sigact, 0, sizeof(sigact));
103 sigact.sa_flags = SA_RESTART;
104 sigact.sa_handler = print_crypt_status;
105 sigaction(SIGUSR1, &sigact, NULL);
106 sigaction(SIGALRM, &sigact, NULL);
107 if (status_timer) setup_next_alarm(status_timer > 1000000 ? 1000000 : status_timer);
108 sigact.sa_handler = change_status_width;
109 sigaction(SIGQUIT, &sigact, NULL);
110 sigact.sa_handler = change_status_timer;
111 sigaction(SIGUSR2, &sigact, NULL);
113 sigact.sa_handler = print_crypt_status_genrnd;
114 sigaction(SIGINT, &sigact, NULL);
115 sigaction(SIGTERM, &sigact, NULL);
116 sigaction(SIGTSTP, &sigact, NULL);
119 sigact.sa_handler = exit_sigterm_genrnd;
120 sigaction(SIGINT, &sigact, NULL);
121 sigaction(SIGTERM, &sigact, NULL);
122 sigact.sa_handler = handle_sigtstp;
123 sigaction(SIGTSTP, &sigact, NULL);
125 memset(&sigact, 0, sizeof(struct sigaction));
127 tfc_getcurtime(&delta_time);
129 if (do_less_stats) do_less_stats = NO;
130 else do_less_stats = YES;
134 foutname = TFC_STDOUT_NAME;
136 else if (!strcmp(foutname, "-")) {
138 foutname = TFC_STDOUT_NAME;
140 else fd = xopen(foutname, O_WRONLY | O_CREAT | O_LARGEFILE | write_flags);
143 if (lseek(fd, offset, SEEK_SET) == -1)
144 xerror(ignore_seek_errors, NO, NO, "%s: seek failed", foutname);
147 if (do_edcrypt == TFC_DO_PLAIN) memset(srcblk, 0, sizeof(srcblk));
149 if (verbose) tfc_nfsay(stderr, "%s: writing %lld bytes to %s ... ",
150 tfc_format_pid(progname), nrbytes, foutname);
157 lblock = lrem = blk_len_adj(nrbytes, total_processed_src, blksize);
159 if (do_edcrypt != TFC_DO_PLAIN) tfc_getrandom(srcblk, lblock);
161 if (error_action == TFC_ERRACT_SYNC) wrpos = tfc_fdgetpos(fd);
162 _wagain: lio = xwrite(fd, pblk, lrem);
164 if (errno != EIO && catch_all_errors != YES)
165 xerror(NO, NO, YES, "%s", foutname);
166 switch (error_action) {
167 case TFC_ERRACT_CONT: xerror(YES, NO, YES, "%s", foutname); goto _wagain; break;
168 case TFC_ERRACT_SYNC:
169 case TFC_ERRACT_LSYNC:
170 xerror(YES, NO, YES, "%s", foutname);
171 if (wrpos == NOFSIZE) lseek(fd, lblock, SEEK_CUR);
172 else lseek(fd, wrpos + lblock, SEEK_SET);
174 default: xerror(NO, NO, YES, "%s", foutname); break;
177 if (do_fsync && fsync(fd) == -1) xerror(NO, NO, YES, "%s", foutname);
184 total_processed_src += lblock;
185 delta_processed += lblock;
186 total_processed_dst = total_processed_src;
187 if (total_processed_src >= nrbytes) break;
190 if (verbose) tfc_esay("done!");
191 if (verbose || status_timer) {
192 print_crypt_status(TFC_SIGSTAT);