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/* packet.h - packet read/write stuff
* Copyright (c) 1997 by Werner Koch (dd9jn)
*
* This file is part of G10.
*
* G10 is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* G10 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 G10_PACKET_H
#define G10_PACKET_H
#include "types.h"
#include "iobuf.h"
#include "mpi.h"
#include "cipher.h"
#include "filter.h"
#define PKT_PUBKEY_ENC 1 /* public key encrypted packet */
#define PKT_SIGNATURE 2 /* secret key encrypted packet */
#define PKT_SECKEY_CERT 5 /* secret key certificate */
#define PKT_PUBKEY_CERT 6 /* public key certificate */
#define PKT_COMPR_DATA 8 /* compressed data packet */
#define PKT_ENCR_DATA 9 /* conventional encrypted data */
#define PKT_PLAINTEXT 11 /* plaintext data with filename and mode */
#define PKT_RING_TRUST 12 /* keyring trust packet */
#define PKT_USER_ID 13 /* user id packet */
#define PKT_COMMENT 14 /* comment packet */
typedef struct packet_struct PACKET;
typedef struct {
u32 keyid[2]; /* 64 bit keyid */
byte pubkey_algo; /* algorithm used for public key scheme */
union {
struct {
MPI rsa_integer; /* integer containing the DEK */
} rsa;
} d;
} PKT_pubkey_enc;
typedef struct {
u32 keyid[2]; /* 64 bit keyid */
u32 timestamp; /* signature made */
byte sig_class; /* sig classification, append for MD calculation*/
byte pubkey_algo; /* algorithm used for public key scheme */
/* (PUBKEY_ALGO_xxx) */
union {
struct {
byte digest_algo; /* algorithm used for digest (DIGEST_ALGO_xxxx) */
byte digest_start[2]; /* first 2 byte of the digest */
MPI rsa_integer; /* the encrypted digest */
} rsa;
} d;
} PKT_signature;
typedef struct {
u32 timestamp; /* certificate made */
u16 valid_days; /* valid for this number of days */
byte pubkey_algo; /* algorithm used for public key scheme */
md_filter_context_t mfx;
union {
struct {
MPI rsa_n; /* public modulus */
MPI rsa_e; /* public exponent */
} rsa;
} d;
} PKT_pubkey_cert;
typedef struct {
u32 timestamp; /* certificate made */
u16 valid_days; /* valid for this number of days */
byte pubkey_algo; /* algorithm used for public key scheme */
union {
struct {
MPI rsa_n; /* public modulus */
MPI rsa_e; /* public exponent */
MPI rsa_d; /* secret descryption exponent */
MPI rsa_p; /* secret first prime number */
MPI rsa_q; /* secret second prime number */
MPI rsa_u; /* secret multiplicative inverse */
u16 csum; /* checksum */
u16 calc_csum; /* and a place to store the calculated csum */
byte is_protected; /* The above infos are protected and must */
/* be deciphered before use */
byte protect_algo; /* cipher used to protect the secret informations*/
union { /* information for the protection */
struct {
byte iv[8]; /* initialization vector for CFB mode */
/* when protected, the MPIs above are pointers
* to plain storage */
} idea;
struct {
byte iv[8];
} blowfish;
} protect;
} rsa;
} d;
} PKT_seckey_cert;
typedef struct {
int len; /* length of data */
char data[1];
} PKT_comment;
typedef struct {
int len; /* length of the name */
char name[1];
} PKT_user_id;
typedef struct {
u32 len; /* reserved */
byte algorithm;
IOBUF buf; /* IOBUF reference */
} PKT_compressed;
typedef struct {
u32 len; /* length of encrypted data */
IOBUF buf; /* IOBUF reference */
} PKT_encr_data;
typedef struct {
u32 len; /* length of encrypted data */
IOBUF buf; /* IOBUF reference */
int mode;
u32 timestamp;
int namelen;
char name[1];
} PKT_plaintext;
/* combine all packets into a union */
struct packet_struct {
int pkttype;
PKT_pubkey_cert *pkc_parent; /* the pubkey to which it belongs */
PKT_seckey_cert *skc_parent; /* the seckey to which it belongs */
PKT_user_id *user_parent; /* the user_id to which it belongs */
union {
void *generic;
PKT_pubkey_enc *pubkey_enc; /* PKT_PUBKEY_ENC */
PKT_signature *signature; /* PKT_SIGNATURE */
PKT_pubkey_cert *pubkey_cert; /* PKT_PUBKEY_CERT */
PKT_seckey_cert *seckey_cert; /* PKT_SECKEY_CERT */
PKT_comment *comment; /* PKT_COMMENT */
PKT_user_id *user_id; /* PKT_USER_ID */
PKT_compressed *compressed; /* PKT_COMPRESSED */
PKT_encr_data *encr_data; /* PKT_ENCR_DATA */
PKT_plaintext *plaintext; /* PKT_PLAINTEXT */
} pkt;
};
#define init_packet(a) do { (a)->pkttype = 0; \
(a)->pkc_parent = NULL; \
(a)->skc_parent = NULL; \
(a)->user_parent = NULL; \
(a)->pkt.generic = NULL; \
} while(0)
/*-- mainproc.c --*/
int proc_packets( IOBUF a );
/*-- parse-packet.c --*/
int set_packet_list_mode( int mode );
int parse_packet( IOBUF inp, PACKET *ret_pkt);
/*-- build-packet.c --*/
int build_packet( IOBUF inp, PACKET *pkt );
u32 calc_packet_length( PACKET *pkt );
/*-- free-packet.c --*/
void free_pubkey_enc( PKT_pubkey_enc *enc );
void free_seckey_enc( PKT_signature *enc );
void free_pubkey_cert( PKT_pubkey_cert *cert );
void free_seckey_cert( PKT_seckey_cert *cert );
void free_user_id( PKT_user_id *uid );
void free_comment( PKT_comment *rem );
void free_packet( PACKET *pkt );
PKT_pubkey_cert *copy_pubkey_cert( PKT_pubkey_cert *d, PKT_pubkey_cert *s );
/*-- sig-check.c --*/
int signature_check( PKT_signature *sig, MD_HANDLE digest );
/*-- seckey-cert.c --*/
int check_secret_key( PKT_seckey_cert *cert );
/*-- pubkey-enc.c --*/
int get_session_key( PKT_pubkey_enc *k, DEK *dek );
/*-- compressed.c --*/
int handle_compressed( PKT_compressed *zd );
/*-- encr-data.c --*/
int decrypt_data( PKT_encr_data *ed, DEK *dek );
int encrypt_data( PKT_encr_data *ed, DEK *dek );
/*-- plaintext.c --*/
int handle_plaintext( PKT_plaintext *pt );
#endif /*G10_PACKET_H*/

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