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Diffstat (limited to 'src/file2key.c')
| -rw-r--r-- | src/file2key.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/file2key.c b/src/file2key.c new file mode 100644 index 0000000..77d1347 --- /dev/null +++ b/src/file2key.c @@ -0,0 +1,185 @@ +/** + * 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 "keccak.h" + +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <stddef.h> +#include <string.h> + +#include <passphrase.h> + + +/** + * Random string created with `dd if=/dev/random bs=1024 count=1 | tr -d -c a-zA-Z0-9` + * + * DO NOT EDIT! + */ +char* STATIC_SALT = "5EbppWrYxMuBKQmbDz8rOCVCONsSLas74qrjMLTiJqsYWcTePNeshVXcmAWGkh88VeFh"; + + + +const char* const COLOUR_HEX[] = + { + "\033[31m0", + "\033[31m1", + "\033[31m2", + "\033[31m3", + "\033[31m4", + "\033[32m5", + "\033[32m6", + "\033[32m7", + "\033[32m8", + "\033[32m9", + "\033[34ma", + "\033[34mb", + "\033[34mc", + "\033[34md", + "\033[34me", + "\033[34mf", + }; + + + +int main(int argc, char** argv) +{ + int is_echo_disabled = 0; + int is_hash_initialised = 0; + + FILE* file = NULL; + char* passphrase = NULL; + size_t passphrase_n; + int8_t* hash; + int8_t* data = NULL; + size_t ptr; + size_t blksize; + size_t got; + struct stat attr; + + if ((argc != 2) || (argv[1][0] == '-')) + { + printf("USAGE: %s FILE\n", *argv); + return 0; + } + + if (stat(argv[1], &attr) < 0) + goto pfail; + if (S_ISREG(attr.st_mode) == 0) + { + fprintf(stderr, "%s: input file is not a regular file\n", *argv); + goto fail; + } + if (attr.st_size < 100 << 10) + fprintf(stderr, "%s: warning: input file is small (less than 100 KB)\n", *argv); + + file = fopen(argv[1], "r"); + if (file == NULL) + goto pfail; + data = malloc(attr.st_size * sizeof(int8_t)); + if (data == NULL) + goto pfail; + + blksize = attr.st_blksize ? attr.st_blksize : (8 << 10); + + for (ptr = 0; ptr < attr.st_size; ptr += got) + { + got = fread(data + ptr, 1, blksize, file); + if (got < blksize) + { + if (ferror(file)) + goto pfail; + break; + } + } + + fclose(file), file = NULL; + + passphrase_disable_echo(), is_echo_disabled = 1; + fprintf(stderr, "[%s] Enter passphrase: ", *argv); + fflush(stderr); + passphrase = passphrase_read(); + if (passphrase == NULL) + goto pfail; + passphrase_n = strlen(passphrase); + passphrase_reenable_echo(), is_echo_disabled = 0; + + initialise(), is_hash_initialised = 1; + + update(passphrase, passphrase_n); + passphrase_wipe(passphrase, passphrase_n); + free(passphrase), passphrase = NULL; + + for (ptr = 0; ptr < attr.st_size; ptr += 72) + { + size_t i, n = attr.st_size - ptr; + if (n > 72) + n = 72; + + if (ptr == 0) + { + char* phash = malloc((20 * 6) + 1 * sizeof(char)); + if (phash == NULL) + goto pfail; + hash = digest(STATIC_SALT, strlen(STATIC_SALT)); + + for (i = 0; i < 10; i++) + { + memcpy(phash + (i * 2 + 0) * 6, COLOUR_HEX[((uint8_t)(hash[i]) >> 4) & 15], 6 * sizeof(char)); + memcpy(phash + (i * 2 + 1) * 6, COLOUR_HEX[((uint8_t)(hash[i]) >> 0) & 15], 6 * sizeof(char)); + } + phash[20 * 6] = '\0'; + + fprintf(stderr, "%s: passphrase hash: %s\033[00m\n", *argv, phash); + free(phash); + } + else + hash = squeeze(); + + for (i = 0; i < n; i++) + *(hash + i) ^= *(data + ptr + i); + + if (fwrite(hash, 1, n, stdout) < n) + goto pfail; + } + + free(data), data = NULL; + dispose(), is_hash_initialised = 0; + return 0; + + pfail: + perror(*argv); + fail: + if (file) + fclose(file); + if (data) + free(data); + if (is_echo_disabled) + passphrase_reenable_echo(); + if (passphrase) + { + passphrase_wipe(passphrase, passphrase_n); + free(passphrase); + } + if (is_hash_initialised) + dispose(); + return 1; +} + |