diff options
| -rw-r--r-- | .gitignore | 13 | ||||
| -rw-r--r-- | COPYING | 17 | ||||
| -rw-r--r-- | DEPENDENCIES | 3 | ||||
| -rw-r--r-- | LICENSE | 670 | ||||
| -rw-r--r-- | Makefile | 87 | ||||
| -rw-r--r-- | config.h | 11 | ||||
| -rw-r--r-- | config.mk | 6 | ||||
| -rw-r--r-- | file2key.c | 251 | ||||
| -rw-r--r-- | settings.h | 34 | ||||
| -rw-r--r-- | src/file2key.c | 282 |
10 files changed, 331 insertions, 1043 deletions
@@ -1,15 +1,6 @@ -_/ -bin/ -obj/ -\#*\# -.* -!.git* *~ -*.swo -*.swp -*.bak +*\#* *.o *.out *.su -*.gch - +/file2key diff --git a/COPYING b/COPYING deleted file mode 100644 index 253427c..0000000 --- a/COPYING +++ /dev/null @@ -1,17 +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/>. - diff --git a/DEPENDENCIES b/DEPENDENCIES index eeca935..af6600c 100644 --- a/DEPENDENCIES +++ b/DEPENDENCIES @@ -9,7 +9,7 @@ BUILD DEPENDENCIES: coreutils make - gcc + cc libc libpassphrase libkeccak @@ -19,4 +19,3 @@ INSTALL DEPENDENCIES: coreutils make - @@ -1,661 +1,15 @@ - GNU AFFERO GENERAL PUBLIC LICENSE - Version 3, 19 November 2007 +ISC License - Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> - Everyone is permitted to copy and distribute verbatim copies - of this license document, but changing it is not allowed. +© 2014, 2017, 2021 Mattias Andrée <maandree@kth.se> - Preamble +Permission to use, copy, modify, and/or distribute this software for any +purpose with or without fee is hereby granted, provided that the above +copyright notice and this permission notice appear in all copies. - The GNU Affero General Public License is a free, copyleft license for -software and other kinds of works, specifically designed to ensure -cooperation with the community in the case of network server software. - - The licenses for most software and other practical works are designed -to take away your freedom to share and change the works. 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If not, see <http://www.gnu.org/licenses/>. - -Also add information on how to contact you by electronic and paper mail. - - If your software can interact with users remotely through a computer -network, you should also make sure that it provides a way for users to -get its source. For example, if your program is a web application, its -interface could display a "Source" link that leads users to an archive -of the code. There are many ways you could offer source, and different -solutions will be better for different programs; see section 13 for the -specific requirements. - - You should also get your employer (if you work as a programmer) or school, -if any, to sign a "copyright disclaimer" for the program, if necessary. -For more information on this, and how to apply and follow the GNU AGPL, see -<http://www.gnu.org/licenses/>. +THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. @@ -1,83 +1,24 @@ -# Copying and distribution of this file, with or without modification, -# are permitted in any medium without royalty provided the copyright -# notice and this notice are preserved. This file is offered as-is, -# without any warranty. +.POSIX: +CONFIGFILE = config.mk +include $(CONFIGFILE) -# The package path prefix, if you want to install to another root, set DESTDIR to that root. -PREFIX ?= /usr -# The command path excluding prefix. -BIN ?= /bin -# The resource path excluding prefix. -DATA ?= /share -# The command path including prefix. -BINDIR ?= $(PREFIX)$(BIN) -# The resource path including prefix. -DATADIR ?= $(PREFIX)$(DATA) -# The license base path including prefix. -LICENSEDIR ?= $(DATADIR)/licenses +all: file2key -# The name of the package as it should be installed. -PKGNAME ?= file2key -# The name of the command as it should be installed. -COMMAND ?= file2key +file2key: file2key.o + $(CC) -o $@ file2key.o $(LDFLAGS) +file2key.o: file2key.c settings.h config.h + $(CC) -c -o $@ file2key.c $(CFLAGS) $(CPPFLAGS) -# Optimisation level (and debug flags.) -OPTIMISE = -O3 +install: file2key + mkdir -p -- "$(DESTDIR)$(PREFIX)/bin" + cp -- file2key "$(DESTDIR)$(PREFIX)/bin/" -# Enabled Warnings. -WARN = -Wall -Wextra -pedantic -Wdouble-promotion -Wformat=2 -Winit-self \ - -Wmissing-include-dirs -Wtrampolines -Wfloat-equal -Wshadow \ - -Wmissing-prototypes -Wmissing-declarations -Wredundant-decls \ - -Wnested-externs -Wno-variadic-macros -Wsign-conversion \ - -Wswitch-default -Wconversion -Wsync-nand -Wunsafe-loop-optimizations \ - -Wcast-align -Wstrict-overflow -Wdeclaration-after-statement -Wundef \ - -Wbad-function-cast -Wcast-qual -Wwrite-strings -Wlogical-op \ - -Waggregate-return -Wstrict-prototypes -Wold-style-definition -Wpacked \ - -Wvector-operation-performance -Wunsuffixed-float-constants \ - -Wsuggest-attribute=const -Wsuggest-attribute=noreturn \ - -Wsuggest-attribute=pure -Wsuggest-attribute=format -Wnormalized=nfkc - -# The C standard used in the code. -STD = gnu99 - - -# Options for the C compiler. -FLAGS = $(OPTIMISE) $(WARN) -std=$(STD) \ - -ftree-vrp -fstrict-aliasing -fipa-pure-const -fstack-usage \ - -fstrict-overflow -funsafe-loop-optimizations -fno-builtin - - - -.PHONY: all -all: bin/file2key - -bin/file2key: obj/file2key.o - @mkdir -p bin - $(CC) $(FLAGS) -lpassphrase -lkeccak -o $@ $^ $(LDFLAGS) - -obj/%.o: src/%.c - @mkdir -p obj - $(CC) $(FLAGS) -c -o $@ $< $(CFLAGS) $(CPPFLAGS) - - -.PHONY: install -install: bin/file2key - install -dm755 -- "$(DESTDIR)$(BINDIR)" - install -m755 bin/file2key -- "$(DESTDIR)$(BINDIR)/$(COMMAND)" - install -dm755 -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)" - install -m644 LICENSE COPYING -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)" - -.PHONY: uninstall uninstall: - -rm -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)/COPYING" - -rm -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)/LICENSE" - -rmdir -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)" - -rm -- "$(DESTDIR)$(BINDIR)/$(COMMAND)" - + -rm -f -- "$(DESTDIR)$(PREFIX)/bin/file2key" -.PHONY: clean clean: - -rm -r bin obj + -rm -rf -- *.o file2key +.PHONY: all install uninstall clean diff --git a/config.h b/config.h new file mode 100644 index 0000000..90aae2f --- /dev/null +++ b/config.h @@ -0,0 +1,11 @@ +/* See LICENSE file for copyright and license details. */ + +/** + * Prompt string that tells you to enter your passphrase + */ +#ifndef PASSPHRASE_PROMPT_STRING +# define PASSPHRASE_PROMPT_STRING "[file2key] Enter passphrase: " +# ifdef __GNUC__ +# warning: you should personalise PASSPHRASE_PROMPT_STRING. +# endif +#endif diff --git a/config.mk b/config.mk new file mode 100644 index 0000000..42aeeb4 --- /dev/null +++ b/config.mk @@ -0,0 +1,6 @@ +PREFIX = /usr/local +MANPREFIX = $(CONFIGFILE) + +CFLAGS = -std=c99 -Wall -Wextra -O2 +CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 +LDFLAGS = -s -lpassphrase -lkeccak diff --git a/file2key.c b/file2key.c new file mode 100644 index 0000000..77b9fc3 --- /dev/null +++ b/file2key.c @@ -0,0 +1,251 @@ +/* See LICENSE file for copyright and license details. */ +#include <sys/stat.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <passphrase.h> +#include <libkeccak.h> + +#include "config.h" +#include "settings.h" + + +/** + * Map from hexadecimal to colour-coded hexadecimal + */ +const char *const COLOUR_HEX[] = { + ['0'] = "\033[31m0", + ['1'] = "\033[31m1", + ['2'] = "\033[32m2", + ['3'] = "\033[33m3", + ['4'] = "\033[32m4", + ['5'] = "\033[33m5", + ['6'] = "\033[31m6", + ['7'] = "\033[34m7", + ['8'] = "\033[34m8", + ['9'] = "\033[34m9", + ['a'] = "\033[32ma", + ['b'] = "\033[31mb", + ['c'] = "\033[33mc", + ['d'] = "\033[34md", + ['e'] = "\033[33me", + ['f'] = "\033[32mf", +}; + + + +/** + * `argv[0]` from `main` + */ +static char *argv0; + + + +/** + * Ask the user for the passphrase + * + * @param passphrasep Output parameter for the passphrase + * @return Zero on success, an appropriate exit value on error + */ +static int +get_passphrase(char **passphrasep) +{ + int ttyfd; + ttyfd = open("/dev/tty", O_RDONLY); + if (ttyfd < 0) { + perror(argv0); + return 2; + } + passphrase_disable_echo1(ttyfd); + fprintf(stderr, "%s", PASSPHRASE_PROMPT_STRING); + fflush(stderr); + *passphrasep = passphrase_read2(ttyfd, PASSPHRASE_READ_EXISTING); + if (!*passphrasep) + perror(argv0); + passphrase_reenable_echo1(ttyfd); + close(ttyfd); + return *passphrasep ? 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) +{ + struct libkeccak_spec spec; + struct libkeccak_state 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) || PASSPHRASE_KECCAK_SQUEEZES <= 0) { + fprintf(stderr, "%s: 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", argv0); + return 1; + } + + if (libkeccak_state_initialise(&state, &spec)) { + perror(argv0); + return 2; + } + + if (libkeccak_digest(&state, passphrase, strlen(passphrase), 0, NULL, PASSPHRASE_KECCAK_SQUEEZES == 1 ? hashsum : NULL)) { + perror(argv0); + libkeccak_state_destroy(&state); + return 2; + } + if (PASSPHRASE_KECCAK_SQUEEZES > 2) + libkeccak_fast_squeeze(&state, PASSPHRASE_KECCAK_SQUEEZES - 2); + if (PASSPHRASE_KECCAK_SQUEEZES > 1) + libkeccak_squeeze(&state, hashsum); + + libkeccak_state_destroy(&state); + + libkeccak_behex_lower(hexsum, hashsum, sizeof(hashsum) / sizeof(char)); + fprintf(stderr, "%s: passphrase hash: ", argv0); + 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; +} + + +/** + * @return 0: success + * 1: user error + * 2: on system error + */ +int +main(int argc, char *argv[]) +{ + struct libkeccak_generalised_spec gspec; + struct libkeccak_spec spec; + struct libkeccak_state 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; + size_t start; + ssize_t n; + + argv0 = *argv++, argc--; + if (argc > 0 && argv[0][0] == '-') { + if (argv[0][1] == '-' && !argv[0][2]) + argv++, argc--; + else if (argv[0][1]) + goto usage; + } + if (argc > 1) { + usage: + fprintf(stderr, "usage: %s [file]\n", argv0); + return 1; + } + + if (argc > 0 && strcmp(argv[0], "-")) { + fd = open(argv[0], O_RDONLY); + if (fd < 0) + goto pfail; + } else { + fd = STDIN_FILENO; + } + if (isatty(fd)) { + fprintf(stderr, "%s: input file must not be a terminal\n", argv0); + close(fd); + return 1; + } + if (fstat(fd, &attr) == 0) + if (attr.st_blksize > 0) + blksize = (size_t)attr.st_blksize; + + libkeccak_generalised_spec_initialise(&gspec); + libkeccak_degeneralise_spec(&gspec, &spec); + if (libkeccak_state_initialise(&state, &spec)) + goto pfail; + if ((r = get_passphrase(&passphrase))) + goto fail; + if ((r = hash_passphrase(passphrase))) + goto fail; + if (libkeccak_update(&state, passphrase, strlen(passphrase))) + goto pfail; + passphrase_wipe(passphrase, strlen(passphrase)); + free(passphrase); + passphrase = NULL; + + hash_size = (size_t)(spec.output / 8); + if (!(hash = malloc(hash_size))) + goto pfail; + if (!(data = malloc(blksize))) + goto pfail; + + if (libkeccak_digest(&state, KEY_PEPPER, strlen(KEY_PEPPER), 0, NULL, hash)) + goto pfail; + + for (;;) { + if (hash_ptr == hash_size) { + libkeccak_squeeze(&state, hash); + hash_ptr = 0; + } + + if (data_ptr == data_size) { + n = read(fd, data, blksize); + if (n <= 0) { + if (!n) + break; + goto pfail; + } + data_size = (size_t)n; + data_ptr = 0; + } + + 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); + if (n <= 0) + goto pfail; + 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 (argc > 0 && fd >= 0) + close(fd); + return r; +} diff --git a/settings.h b/settings.h new file mode 100644 index 0000000..2147e73 --- /dev/null +++ b/settings.h @@ -0,0 +1,34 @@ +/* See LICENSE file for copyright and license details. */ + +/** + * Random string created with `dd if=/dev/random bs=1024 count=1 | tr -d -c a-zA-Z0-9` + */ +#define KEY_PEPPER "5EbppWrYxMuBKQmbDz8rOCVCONsSLas74qrjMLTiJqsYWcTePNeshVXcmAWGkh88VeFh" + +/** + * 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 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; -} - |