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/*
* Off-the-Record Messaging Toolkit
* Copyright (C) 2004-2005 Nikita Borisov and Ian Goldberg
* <otr@cypherpunks.ca>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* system headers */
#include <stdio.h>
#include <stdlib.h>
/* libgcrypt headers */
#include <gcrypt.h>
/* toolkit headers */
#include "parse.h"
#include "sha1hmac.h"
static void usage(const char *progname)
{
fprintf(stderr, "Usage: %s mackey snd_keyid rcp_keyid pubkey counter "
"encdata revealed_mackeys\n"
"Make a new Data message, with the given pieces (note that the\n"
"data part is already encrypted). MAC it with the given mackey.\n"
"mackey, pubkey, counter, encdata, and revealed_mackeys are given\n"
"as strings of hex chars. snd_keyid and rcp_keyid are decimal integers.\n", progname);
exit(1);
}
int main(int argc, char **argv)
{
unsigned char *mackey;
size_t mackeylen;
unsigned int snd_keyid, rcp_keyid;
unsigned char *pubkey;
size_t pubkeylen;
gcry_mpi_t pubv;
unsigned char *ctr;
size_t ctrlen;
unsigned char *encdata;
size_t encdatalen;
unsigned char *mackeys;
size_t mackeyslen;
char *newdatamsg;
if (argc != 8) {
usage(argv[0]);
}
argv_to_buf(&mackey, &mackeylen, argv[1]);
if (!mackey) {
usage(argv[0]);
}
if (mackeylen != 20) {
fprintf(stderr, "The MAC key must be 40 hex chars long.\n");
usage(argv[0]);
}
if (sscanf(argv[2], "%u", &snd_keyid) != 1) {
fprintf(stderr, "Unparseable snd_keyid given.\n");
usage(argv[0]);
}
if (sscanf(argv[3], "%u", &rcp_keyid) != 1) {
fprintf(stderr, "Unparseable rcp_keyid given.\n");
usage(argv[0]);
}
argv_to_buf(&pubkey, &pubkeylen, argv[4]);
if (!pubkey) {
usage(argv[0]);
}
gcry_mpi_scan(&pubv, GCRYMPI_FMT_USG, pubkey, pubkeylen, NULL);
free(pubkey);
argv_to_buf(&ctr, &ctrlen, argv[5]);
if (!ctr) {
usage(argv[0]);
}
if (ctrlen != 8) {
fprintf(stderr, "The counter must be 16 hex chars long.\n");
usage(argv[0]);
}
argv_to_buf(&encdata, &encdatalen, argv[6]);
if (!encdata) {
usage(argv[0]);
}
argv_to_buf(&mackeys, &mackeyslen, argv[7]);
if (!mackeys) {
usage(argv[0]);
}
newdatamsg = assemble_datamsg(mackey, snd_keyid, rcp_keyid, pubv, ctr,
encdata, encdatalen, mackeys, mackeyslen);
printf("%s\n", newdatamsg);
free(newdatamsg);
free(mackey);
gcry_mpi_release(pubv);
free(ctr);
free(encdata);
free(mackeys);
fflush(stdout);
return 0;
}
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