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/**
* 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 <stdlib.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!
*/
#define 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;
char* hash;
char* 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((size_t)(attr.st_size) * sizeof(char));
if (data == NULL)
goto pfail;
blksize = attr.st_blksize ? (size_t)(attr.st_blksize) : (size_t)(8 << 10);
for (ptr = 0; ptr < (size_t)(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 < (size_t)(attr.st_size); ptr += 72)
{
size_t i, n = (size_t)(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[((unsigned char)(hash[i]) >> 4) & 15], 6 * sizeof(char));
memcpy(phash + (i * 2 + 1) * 6, COLOUR_HEX[((unsigned char)(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;
}
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