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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"
typedef enum {
PKT_NONE =0,
PKT_PUBKEY_ENC =1, /* public key encrypted packet */
PKT_SIGNATURE =2, /* secret key encrypted packet */
PKT_SESSION_KEY =3, /* session key packet (OpenPGP)*/
PKT_ONEPASS_SIG =4, /* one pass sig packet (OpenPGP)*/
PKT_SECRET_CERT =5, /* secret key certificate */
PKT_PUBLIC_CERT =6, /* public key certificate */
PKT_SECKEY_SUBCERT =7, /* secret subkey certificate (OpenPGP) */
PKT_COMPRESSED =8, /* compressed data packet */
PKT_ENCRYPTED =9, /* conventional encrypted data */
PKT_MARKER =10, /* marker packet (OpenPGP) */
PKT_PLAINTEXT =11, /* plaintext data with filename and mode */
PKT_RING_TRUST =12, /* keyring trust packet */
PKT_USER_ID =13, /* user id packet */
PKT_PUBKEY_SUBCERT=14, /* subkey certificate (OpenPGP) */
PKT_COMMENT =16 /* new comment packet (OpenPGP) */
} pkttype_t;
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 a, b; /* integers with the encrypteded DEK */
} elg;
struct {
MPI rsa_integer; /* integer containing the DEK */
} rsa;
} d;
} PKT_pubkey_enc;
typedef struct {
u32 keyid[2]; /* 64 bit keyid */
byte sig_class; /* sig classification */
byte digest_algo; /* algorithm used for digest */
byte pubkey_algo; /* algorithm used for public key scheme */
byte last; /* a stupid flag */
} PKT_onepass_sig;
typedef struct {
u32 keyid[2]; /* 64 bit keyid */
ulong local_id; /* internal use, valid if > 0 */
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 a, b; /* integers with the digest */
} elg;
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 hdrbytes; /* number of header bytes */
byte version;
byte pubkey_algo; /* algorithm used for public key scheme */
ulong local_id; /* internal use, valid if > 0 */
union {
struct {
MPI p; /* prime */
MPI g; /* group generator */
MPI y; /* g^x mod p */
} elg;
struct {
MPI rsa_n; /* public modulus */
MPI rsa_e; /* public exponent */
} rsa;
} d;
} PKT_public_cert;
typedef struct {
u32 timestamp; /* certificate made */
u16 valid_days; /* valid for this number of days */
byte hdrbytes; /* number of header bytes */
byte version;
byte pubkey_algo; /* algorithm used for public key scheme */
union {
struct {
MPI p; /* prime */
MPI g; /* group generator */
MPI y; /* g^x mod p */
MPI x; /* secret exponent */
u16 csum; /* checksum */
byte is_protected; /* The above infos are protected and must */
/* be decrypteded 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 */
} blowfish;
} protect;
} elg;
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 */
byte is_protected; /* The above infos are protected and must */
/* be decrypteded 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 */
} blowfish;
} protect;
} rsa;
} d;
} PKT_secret_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_encrypted;
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 {
pkttype_t pkttype;
union {
void *generic;
PKT_pubkey_enc *pubkey_enc; /* PKT_PUBKEY_ENC */
PKT_onepass_sig *onepass_sig; /* PKT_ONEPASS_SIG */
PKT_signature *signature; /* PKT_SIGNATURE */
PKT_public_cert *public_cert; /* PKT_PUBLIC_CERT */
PKT_secret_cert *secret_cert; /* PKT_SECRET_CERT */
PKT_comment *comment; /* PKT_COMMENT */
PKT_user_id *user_id; /* PKT_USER_ID */
PKT_compressed *compressed; /* PKT_COMPRESSED */
PKT_encrypted *encrypted; /* PKT_ENCRYPTED */
PKT_plaintext *plaintext; /* PKT_PLAINTEXT */
} pkt;
};
#define init_packet(a) do { (a)->pkttype = 0; \
(a)->pkt.generic = NULL; \
} while(0)
/*-- mainproc.c --*/
int proc_packets( IOBUF a );
int list_packets( IOBUF a );
/*-- parse-packet.c --*/
int set_packet_list_mode( int mode );
int search_packet( IOBUF inp, PACKET *pkt, int pkttype, ulong *retpos );
int parse_packet( IOBUF inp, PACKET *ret_pkt);
int copy_all_packets( IOBUF inp, IOBUF out );
int copy_some_packets( IOBUF inp, IOBUF out, ulong stopoff );
int skip_some_packets( IOBUF inp, unsigned n );
/*-- build-packet.c --*/
int build_packet( IOBUF inp, PACKET *pkt );
u32 calc_packet_length( PACKET *pkt );
void hash_public_cert( MD_HANDLE md, PKT_public_cert *pkc );
/*-- free-packet.c --*/
void free_pubkey_enc( PKT_pubkey_enc *enc );
void free_seckey_enc( PKT_signature *enc );
int digest_algo_from_sig( PKT_signature *sig );
void release_public_cert_parts( PKT_public_cert *cert );
void free_public_cert( PKT_public_cert *cert );
void release_secret_cert_parts( PKT_secret_cert *cert );
void free_secret_cert( PKT_secret_cert *cert );
void free_user_id( PKT_user_id *uid );
void free_comment( PKT_comment *rem );
void free_packet( PACKET *pkt );
PKT_public_cert *copy_public_cert( PKT_public_cert *d, PKT_public_cert *s );
PKT_secret_cert *copy_secret_cert( PKT_secret_cert *d, PKT_secret_cert *s );
int cmp_public_certs( PKT_public_cert *a, PKT_public_cert *b );
int cmp_public_secret_cert( PKT_public_cert *pkc, PKT_secret_cert *skc );
int cmp_user_ids( PKT_user_id *a, PKT_user_id *b );
/*-- sig-check.c --*/
int signature_check( PKT_signature *sig, MD_HANDLE digest );
/*-- seckey-cert.c --*/
int is_secret_key_protected( PKT_secret_cert *cert );
int check_secret_key( PKT_secret_cert *cert );
int protect_secret_key( PKT_secret_cert *cert, DEK *dek );
/*-- pubkey-enc.c --*/
int get_session_key( PKT_pubkey_enc *k, DEK *dek );
/*-- compress.c --*/
int handle_compressed( PKT_compressed *zd );
/*-- encr-data.c --*/
int decrypt_data( PKT_encrypted *ed, DEK *dek );
int encrypt_data( PKT_encrypted *ed, DEK *dek );
/*-- plaintext.c --*/
int handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx );
int ask_for_detached_datafile( md_filter_context_t *mfx, const char *inname );
/*-- comment.c --*/
int write_comment( IOBUF out, const char *s );
/*-- sign.c --*/
int make_keysig_packet( PKT_signature **ret_sig, PKT_public_cert *pkc,
PKT_user_id *uid, PKT_secret_cert *skc,
int sigclass, int digest_algo );
#endif /*G10_PACKET_H*/
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