change license + misc

Signed-off-by: Mattias Andrée <maandree@kth.se>

10 files changed, 331 insertions, 1043 deletions

diff --git a/.gitignore b/.gitignore
index b635d07..b554ade 100644
--- a/.gitignore
+++ b/.gitignore
@@ -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
-
diff --git a/LICENSE b/LICENSE
index dba13ed..8d48cd3 100644
--- a/LICENSE
+++ b/LICENSE
@@ -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.
 
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-software and other kinds of works, specifically designed to ensure
-cooperation with the community in the case of network server software.
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-to take away your freedom to share and change the works.  By contrast,
-our General Public Licenses are intended to guarantee your freedom to
-share and change all versions of a program--to make sure it remains free
-software for all its users.
-
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-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
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-under version 3 of the GNU General Public License into a single
-combined work, and to convey the resulting work.  The terms of this
-License will continue to apply to the part which is the covered work,
-but the work with which it is combined will remain governed by version
-3 of the GNU General Public License.
-
-  14. Revised Versions of this License.
-
-  The Free Software Foundation may publish revised and/or new versions of
-the GNU Affero General Public License from time to time.  Such new versions
-will be similar in spirit to the present version, but may differ in detail to
-address new problems or concerns.
-
-  Each version is given a distinguishing version number.  If the
-Program specifies that a certain numbered version of the GNU Affero General
-Public License "or any later version" applies to it, you have the
-option of following the terms and conditions either of that numbered
-version or of any later version published by the Free Software
-Foundation.  If the Program does not specify a version number of the
-GNU Affero General Public License, you may choose any version ever published
-by the Free Software Foundation.
-
-  If the Program specifies that a proxy can decide which future
-versions of the GNU Affero General Public License can be used, that proxy's
-public statement of acceptance of a version permanently authorizes you
-to choose that version for the Program.
-
-  Later license versions may give you additional or different
-permissions.  However, no additional obligations are imposed on any
-author or copyright holder as a result of your choosing to follow a
-later version.
-
-  15. Disclaimer of Warranty.
-
-  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
-APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
-OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
-THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
-IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
-ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
-
-  16. Limitation of Liability.
-
-  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
-THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
-GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
-USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
-DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
-PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
-EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
-SUCH DAMAGES.
-
-  17. Interpretation of Sections 15 and 16.
-
-  If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-state the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    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/>.
-
-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.
diff --git a/Makefile b/Makefile
index e860609..6707703 100644
--- a/Makefile
+++ b/Makefile
@@ -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;
-}
-