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author | Mattias Andrée <maandree@kth.se> | 2021-02-22 15:06:08 +0100 |
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committer | Mattias Andrée <maandree@kth.se> | 2021-02-22 15:06:08 +0100 |
commit | 04a2206993e77538f14552ec5a25cfd7543060f3 (patch) | |
tree | cce3a2e3a9c8dcbd48bce4bc7289a7b28d146c8b /src | |
parent | remove dist (diff) | |
download | file2key-04a2206993e77538f14552ec5a25cfd7543060f3.tar.gz file2key-04a2206993e77538f14552ec5a25cfd7543060f3.tar.bz2 file2key-04a2206993e77538f14552ec5a25cfd7543060f3.tar.xz |
change license + misc
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to '')
-rw-r--r-- | src/file2key.c | 282 |
1 files changed, 0 insertions, 282 deletions
diff --git a/src/file2key.c b/src/file2key.c deleted file mode 100644 index 4288ffc..0000000 --- a/src/file2key.c +++ /dev/null @@ -1,282 +0,0 @@ -/** - * file2key – A simple command that generates a key from a file and a passphrase - * - * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org) - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU Affero General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Affero General Public License for more details. - * - * You should have received a copy of the GNU Affero General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ -#include <stdio.h> -#include <sys/stat.h> -#include <unistd.h> -#include <string.h> -#include <stdlib.h> -#include <fcntl.h> - -#include <passphrase.h> -#include <libkeccak.h> - - - -/** - * Random string created with `dd if=/dev/random bs=1024 count=1 | tr -d -c a-zA-Z0-9` - */ -#define STATIC_SALT "5EbppWrYxMuBKQmbDz8rOCVCONsSLas74qrjMLTiJqsYWcTePNeshVXcmAWGkh88VeFh" - - -/** - * Prompt string that tells you to enter your passphrase - */ -#ifndef PASSPHRASE_PROMPT_STRING -# define PASSPHRASE_PROMPT_STRING "[file2key] Enter passphrase: " -# warning: you should personalise PASSPHRASE_PROMPT_STRING. -#endif - -/** - * The rate parameter for the Keccak sponge when hashing master passphrase - */ -#ifndef PASSPHRASE_KECCAK_RATE -# define PASSPHRASE_KECCAK_RATE 576 -#endif - -/** - * The capacity parameter for the Keccak sponge when hashing master passphrase - */ -#ifndef PASSPHRASE_KECCAK_CAPACITY -# define PASSPHRASE_KECCAK_CAPACITY 1024 -#endif - -/** - * The output parameter for the Keccak sponge when hashing master passphrase - */ -#ifndef PASSPHRASE_KECCAK_OUTPUT -# define PASSPHRASE_KECCAK_OUTPUT 32 -#endif - -/** - * The number of times to squeeze the master passphrase - */ -#ifndef PASSPHRASE_KECCAK_SQUEEZES -# define PASSPHRASE_KECCAK_SQUEEZES 10000 -#endif - - - -/** - * Map from hexadecimal to colour-coded hexadecimal - */ -const char* const COLOUR_HEX[] = - { - ['0'] = "\033[31m0", - ['1'] = "\033[31m1", - ['2'] = "\033[31m2", - ['3'] = "\033[31m3", - ['4'] = "\033[31m4", - ['5'] = "\033[32m5", - ['6'] = "\033[32m6", - ['7'] = "\033[32m7", - ['8'] = "\033[32m8", - ['9'] = "\033[32m9", - ['a'] = "\033[34ma", - ['b'] = "\033[34mb", - ['c'] = "\033[34mc", - ['d'] = "\033[34md", - ['e'] = "\033[34me", - ['f'] = "\033[34mf", - }; - - - -#define USER_ERROR(string) \ - (fprintf(stderr, "%s: %s.\n", execname, string), 1) - -#define tt(expr) if ((r = (expr))) goto fail - -#define t(expr) if (expr) goto pfail - - - -/** - * `argv[0]` from `main` - */ -static char* execname; - - - -/** - * Ask the user for the passphrase - * - * @param passphrase Output parameter for the passphrase - * @return Zero on success, an appropriate exit value on error - */ -static int get_passphrase(char** passphrase) -{ - passphrase_disable_echo(); - fprintf(stderr, "%s", PASSPHRASE_PROMPT_STRING); - fflush(stderr); - *passphrase = passphrase_read(); - if (*passphrase == NULL) - perror(execname); - passphrase_reenable_echo(); - return *passphrase ? 0 : 2; -} - - -/** - * Hash, and display, passphrase so to hint the - * user whether it as typed correctly or not - * - * @param passphrase The passphrase - * @return Zero on success, an appropriate exit value on error - */ -static int hash_passphrase(const char* passphrase) -{ -#define SQUEEZES PASSPHRASE_KECCAK_SQUEEZES - libkeccak_spec_t spec; - libkeccak_state_t state; - char hashsum[PASSPHRASE_KECCAK_OUTPUT / 8]; - char hexsum[PASSPHRASE_KECCAK_OUTPUT / 4 + 1]; - size_t i, n; - - spec.bitrate = PASSPHRASE_KECCAK_RATE; - spec.capacity = PASSPHRASE_KECCAK_CAPACITY; - spec.output = PASSPHRASE_KECCAK_OUTPUT; - - if (libkeccak_spec_check(&spec) || (SQUEEZES <= 0)) - return USER_ERROR("bad passhprase hashing parameters, please recompile file2key with with " - "proper values on PASSPHRASE_KECCAK_RATE, PASSPHRASE_KECCAK_CAPACITY, " - "PASSPHRASE_KECCAK_OUTPUT and PASSPHRASE_KECCAK_SQUEEZES"); - - if (libkeccak_state_initialise(&state, &spec)) - return perror(execname), 2; - - if (libkeccak_digest(&state, passphrase, strlen(passphrase), 0, NULL, SQUEEZES == 1 ? hashsum : NULL)) - return perror(execname), libkeccak_state_destroy(&state), 2; - if (SQUEEZES > 2) libkeccak_fast_squeeze(&state, SQUEEZES - 2); - if (SQUEEZES > 1) libkeccak_squeeze(&state, hashsum); - - libkeccak_state_destroy(&state); - - libkeccak_behex_lower(hexsum, hashsum, sizeof(hashsum) / sizeof(char)); - fprintf(stderr, "%s: passphrase hash: ", execname); - for (i = 0, n = strlen(hexsum); i < n; i++) - fprintf(stderr, "%s", COLOUR_HEX[(unsigned char)(hexsum[i])]); - fprintf(stderr, "\033[00m\n"); - - return 0; -#undef SQUEEZES -} - - -/** - * Here we go! - * - * @param argc The number of command line argumnets - * @param argv Command line argumnets - * @return Zero on success, 1 on user error, 2 on system error - */ -int main(int argc, char** argv) -{ - libkeccak_generalised_spec_t gspec; - libkeccak_spec_t spec; - libkeccak_state_t state; - char* passphrase = NULL; - char* hash = NULL; - size_t hash_size = 0; - size_t hash_ptr = 0; - char* data = NULL; - size_t data_size = 0; - size_t data_ptr = 0; - size_t blksize = 4096; - int r, fd = -1; - struct stat attr; - - execname = *argv; - - if ((argc != 2) || (argv[1][0] == '-')) - { - fprintf(stderr, "USAGE: %s FILE\n", execname); - return !!strcmp(argv[1], "--help"); - } - - libkeccak_generalised_spec_initialise(&gspec); - libkeccak_degeneralise_spec(&gspec, &spec); - t (libkeccak_state_initialise(&state, &spec)); - - tt (get_passphrase(&passphrase)); - tt (hash_passphrase(passphrase)); - - t (libkeccak_update(&state, passphrase, strlen(passphrase))); - - passphrase_wipe(passphrase, strlen(passphrase)); - free(passphrase), passphrase = NULL; - - t ((fd = open(argv[1], O_RDONLY), fd < 0)); - if (fstat(fd, &attr) == 0) - if (attr.st_blksize > 0) - blksize = (size_t)(attr.st_blksize); - - hash_size = (size_t)(spec.output / 8); - t ((hash = malloc(hash_size), hash == NULL)); - t ((data = malloc(blksize), data == NULL)); - - t (libkeccak_digest(&state, STATIC_SALT, strlen(STATIC_SALT), 0, NULL, hash)); - - for (;;) - { - size_t start; - ssize_t n; - - if (hash_ptr == hash_size) - libkeccak_squeeze(&state, hash), hash_ptr = 0; - - if (data_ptr == data_size) - { - n = read(fd, data, blksize); - t (n < 0); - if (n == 0) - break; - data_size = (size_t)n; - } - - start = data_ptr; - while ((hash_ptr < hash_size) && (data_ptr < data_size)) - data[data_ptr++] ^= hash[hash_ptr++]; - - while (start < data_ptr) - { - n = write(STDOUT_FILENO, data + start, data_ptr - start); - t (n <= 0); - start += (size_t)n; - } - } - - r = 0; - goto done; - - pfail: - r = 2; - perror(*argv); - fail: - if (passphrase) - passphrase_wipe(passphrase, strlen(passphrase)); - free(passphrase); - done: - libkeccak_state_destroy(&state); - free(data); - free(hash); - if (fd >= 0) - close(fd); - return r; -} - |