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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
*/
#ifndef __PARSE_H__
#define __PARSE_H__
#include <gcrypt.h>
typedef struct s_KeyExchMsg {
unsigned char *raw; /* The base64-decoded data; must be free()d */
unsigned char reply;
gcry_mpi_t p, q, g, e;
unsigned int keyid;
gcry_mpi_t y;
gcry_mpi_t r, s;
unsigned char *sigstart; /* Pointers into the "raw" array. Don't */
unsigned char *sigend; /* free() these. */
} * KeyExchMsg;
typedef struct s_DataMsg {
unsigned char *raw; /* The base64-decoded data; must be free()d */
size_t rawlen;
unsigned int sender_keyid;
unsigned int rcpt_keyid;
gcry_mpi_t y;
unsigned char ctr[8];
unsigned char *encmsg; /* A copy; must be free()d */
size_t encmsglen;
unsigned char mac[20];
unsigned char *mackeys; /* A copy; must be free()d */
size_t mackeyslen;
unsigned char *macstart; /* Pointers into the "raw" array. Don't */
unsigned char *macend; /* free() these. */
} * DataMsg;
/* Dump an unsigned int to a FILE * */
void dump_int(FILE *stream, const char *title, unsigned int val);
/* Dump an mpi to a FILE * */
void dump_mpi(FILE *stream, const char *title, gcry_mpi_t val);
/* Dump data to a FILE * */
void dump_data(FILE *stream, const char *title, const unsigned char *data,
size_t datalen);
/* Parse a Key Exchange Message into a newly-allocated KeyExchMsg structure */
KeyExchMsg parse_keyexch(const char *msg);
/* Deallocate a KeyExchMsg and all of the data it points to */
void free_keyexch(KeyExchMsg keyexch);
/* Parse a Data Message into a newly-allocated DataMsg structure */
DataMsg parse_datamsg(const char *msg);
/* Recalculate the MAC on the message, base64-encode the resulting MAC'd
* message, and put on the appropriate header and footer. Return a
* newly-allocated pointer to the result, which the caller will have to
* free(). */
char *remac_datamsg(DataMsg datamsg, unsigned char mackey[20]);
/* Assemble a new Data Message from its pieces. Return a
* newly-allocated string containing the base64 representation. */
char *assemble_datamsg(unsigned char mackey[20], unsigned int sender_keyid,
unsigned int rcpt_keyid, gcry_mpi_t y, unsigned char ctr[8],
unsigned char *encmsg, size_t encmsglen, unsigned char *mackeys,
size_t mackeyslen);
/* Deallocate a DataMsg and all of the data it points to */
void free_datamsg(DataMsg datamsg);
/* Convert a string of hex chars to a buffer of unsigned chars. */
void argv_to_buf(unsigned char **bufp, size_t *lenp, char *arg);
#endif
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