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/*
* Copyright (C) 2007 Greg Lewis. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#ifndef BUFSIZ
#define BUFSIZ 0x10000
#endif
int
main(int argc, char* argv[]) {
char *key;
char *oname;
char buf[BUFSIZ];
size_t keylen, olen;
int ifd, ofd, i, fileoff = 0, bufoff = 0, buflen = 0, eof = 0;
ssize_t bytes;
if (argc < 3) {
errx(1, "Usage: x_x2zip <key> <file>");
}
// Key
key = argv[1];
keylen = strlen(key);
// Open input file
if ((ifd = open(argv[2], O_RDONLY)) == -1) {
err(1, "Can't open input file %s", argv[2]);
}
// Open output file
olen = strlen(argv[2]) + 5;
if ((oname = (char *) malloc(olen)) == NULL) {
err(1, "Can't create output file name");
}
if (strlcpy(oname, argv[2], olen) >= olen) {
err(1, "Can't create output file name");
}
if (strlcat(oname, ".zip", olen) >= olen) {
err(1, "Can't create output file name");
}
if ((ofd = open(oname,
O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR)) == -1) {
err(1, "Can't open output file %s", oname);
}
free(oname);
while (!eof) {
// Read into the buffer
bufoff = 0;
buflen = 0;
while (1) {
if (buflen >= BUFSIZ) {
break;
}
if ((bytes = read(ifd, buf, BUFSIZ - buflen)) == -1) {
err(1, "Error reading input file");
}
if (!bytes) {
eof = 1;
break;
}
buflen += bytes;
}
// Decrypt
for (i = 0; i < buflen; i++) {
buf[i] = buf[i] ^ key[(fileoff + i) % keylen];
}
// Update file offset
fileoff += buflen;
// Output the buffer
bufoff = 0;
while (bufoff < buflen) {
if ((bytes = write(ofd, buf + bufoff, buflen - bufoff)) == -1) {
err(1, "Error writing output file");
}
bufoff += bytes;
}
}
return 0;
}
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