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-rw-r--r--src/file2key.c282
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;
-}
-
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