mirror of git://git.gnupg.org/gnupg.git
387 lines
8.8 KiB
C
387 lines
8.8 KiB
C
/* build-packet.c - assemble packets and write them
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* G10 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "packet.h"
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#include "errors.h"
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#include "iobuf.h"
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#include "mpi.h"
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#include "util.h"
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#include "cipher.h"
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#include "memory.h"
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#include "options.h"
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static int do_comment( IOBUF out, int ctb, PKT_comment *rem );
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static int do_user_id( IOBUF out, int ctb, PKT_user_id *uid );
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static int do_pubkey_cert( IOBUF out, int ctb, PKT_pubkey_cert *pk );
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static int do_seckey_cert( IOBUF out, int ctb, PKT_seckey_cert *pk );
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static int do_pubkey_enc( IOBUF out, int ctb, PKT_pubkey_enc *enc );
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static u32 calc_plaintext( PKT_plaintext *pt );
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static int do_plaintext( IOBUF out, int ctb, PKT_plaintext *pt );
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static int do_encr_data( IOBUF out, int ctb, PKT_encr_data *ed );
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static int calc_header_length( u32 len );
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static int write_16(IOBUF inp, u16 a);
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static int write_32(IOBUF inp, u32 a);
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static int write_header( IOBUF out, int ctb, u32 len );
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static int write_version( IOBUF out, int ctb );
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/****************
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* Build a packet and write it to INP
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* Returns: 0 := okay
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* >0 := error
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* Note: Caller must free the packet
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*/
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int
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build_packet( IOBUF out, PACKET *pkt )
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{
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int rc=0, ctb;
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if( DBG_PACKET )
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log_debug("build_packet() type=%d\n", pkt->pkttype );
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assert( pkt->pkt.generic );
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ctb = 0x80 | ((pkt->pkttype & 15)<<2);
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switch( pkt->pkttype ) {
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case PKT_USER_ID:
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rc = do_user_id( out, ctb, pkt->pkt.user_id );
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break;
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case PKT_COMMENT:
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rc = do_comment( out, ctb, pkt->pkt.comment );
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break;
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case PKT_PUBKEY_CERT:
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rc = do_pubkey_cert( out, ctb, pkt->pkt.pubkey_cert );
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break;
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case PKT_SECKEY_CERT:
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rc = do_seckey_cert( out, ctb, pkt->pkt.seckey_cert );
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break;
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case PKT_PUBKEY_ENC:
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rc = do_pubkey_enc( out, ctb, pkt->pkt.pubkey_enc );
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break;
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case PKT_PLAINTEXT:
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rc = do_plaintext( out, ctb, pkt->pkt.plaintext );
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break;
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case PKT_ENCR_DATA:
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rc = do_encr_data( out, ctb, pkt->pkt.encr_data );
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break;
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case PKT_SIGNATURE:
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case PKT_RING_TRUST:
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case PKT_COMPR_DATA:
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default:
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log_bug("invalid packet type in build_packet()");
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break;
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}
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return rc;
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}
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/****************
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* calculate the length of a packet described by PKT
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*/
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u32
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calc_packet_length( PACKET *pkt )
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{
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u32 n=0;
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assert( pkt->pkt.generic );
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switch( pkt->pkttype ) {
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case PKT_PLAINTEXT:
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n = calc_plaintext( pkt->pkt.plaintext );
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break;
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case PKT_USER_ID:
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case PKT_COMMENT:
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case PKT_PUBKEY_CERT:
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case PKT_SECKEY_CERT:
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case PKT_PUBKEY_ENC:
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case PKT_ENCR_DATA:
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case PKT_SIGNATURE:
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case PKT_RING_TRUST:
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case PKT_COMPR_DATA:
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default:
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log_bug("invalid packet type in calc_packet_length()");
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break;
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}
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n += calc_header_length(n);
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return n;
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}
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static int
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do_comment( IOBUF out, int ctb, PKT_comment *rem )
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{
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write_header(out, ctb, rem->len);
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if( iobuf_write( out, rem->data, rem->len ) )
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return G10ERR_WRITE_FILE;
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return 0;
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}
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static int
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do_user_id( IOBUF out, int ctb, PKT_user_id *uid )
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{
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write_header(out, ctb, uid->len);
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if( iobuf_write( out, uid->name, uid->len ) )
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return G10ERR_WRITE_FILE;
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return 0;
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}
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static int
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do_pubkey_cert( IOBUF out, int ctb, PKT_pubkey_cert *pkc )
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{
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int rc = 0;
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IOBUF a = iobuf_temp();
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write_version( a, ctb );
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write_32(a, pkc->timestamp );
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write_16(a, pkc->valid_days );
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iobuf_put(a, pkc->pubkey_algo );
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if( pkc->pubkey_algo == PUBKEY_ALGO_RSA ) {
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mpi_encode(a, pkc->d.rsa.rsa_n );
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mpi_encode(a, pkc->d.rsa.rsa_e );
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}
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else {
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rc = G10ERR_PUBKEY_ALGO;
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goto leave;
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}
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write_header(out, ctb, iobuf_get_temp_length(a) );
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if( iobuf_write_temp( out, a ) )
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rc = G10ERR_WRITE_FILE;
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leave:
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iobuf_close(a);
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return rc;
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}
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static int
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do_seckey_cert( IOBUF out, int ctb, PKT_seckey_cert *skc )
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{
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int rc = 0;
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IOBUF a = iobuf_temp();
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write_version( a, ctb );
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write_32(a, skc->timestamp );
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write_16(a, skc->valid_days );
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iobuf_put(a, skc->pubkey_algo );
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if( skc->pubkey_algo == PUBKEY_ALGO_RSA ) {
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mpi_encode(a, skc->d.rsa.rsa_n );
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mpi_encode(a, skc->d.rsa.rsa_e );
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iobuf_put(a, skc->d.rsa.protect_algo );
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skc->d.rsa.calc_csum = 0;
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if( skc->d.rsa.protect_algo ) {
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assert( skc->d.rsa.is_protected == 1 );
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assert( skc->d.rsa.protect_algo == CIPHER_ALGO_BLOWFISH );
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iobuf_write(a, skc->d.rsa.protect.blowfish.iv, 8 );
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mpi_write_csum(a, (byte*)skc->d.rsa.rsa_d, &skc->d.rsa.calc_csum );
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mpi_write_csum(a, (byte*)skc->d.rsa.rsa_p, &skc->d.rsa.calc_csum );
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mpi_write_csum(a, (byte*)skc->d.rsa.rsa_q, &skc->d.rsa.calc_csum );
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mpi_write_csum(a, (byte*)skc->d.rsa.rsa_u, &skc->d.rsa.calc_csum );
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}
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else { /* Not protected: You fool you! */
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assert( !skc->d.rsa.is_protected );
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mpi_encode_csum(a, skc->d.rsa.rsa_d, &skc->d.rsa.calc_csum );
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mpi_encode_csum(a, skc->d.rsa.rsa_p, &skc->d.rsa.calc_csum );
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mpi_encode_csum(a, skc->d.rsa.rsa_q, &skc->d.rsa.calc_csum );
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mpi_encode_csum(a, skc->d.rsa.rsa_u, &skc->d.rsa.calc_csum );
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}
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write_16(a, skc->d.rsa.calc_csum );
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}
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else {
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rc = G10ERR_PUBKEY_ALGO;
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goto leave;
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}
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write_header(out, ctb, iobuf_get_temp_length(a) );
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if( iobuf_write_temp( out, a ) )
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rc = G10ERR_WRITE_FILE;
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leave:
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iobuf_close(a);
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return rc;
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}
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static int
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do_pubkey_enc( IOBUF out, int ctb, PKT_pubkey_enc *enc )
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{
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int rc = 0;
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IOBUF a = iobuf_temp();
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write_version( a, ctb );
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write_32(a, enc->keyid[0] );
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write_32(a, enc->keyid[1] );
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iobuf_put(a,enc->pubkey_algo );
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if( enc->pubkey_algo == PUBKEY_ALGO_RSA ) {
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mpi_encode(a, enc->d.rsa.rsa_integer );
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}
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else {
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rc = G10ERR_PUBKEY_ALGO;
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goto leave;
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}
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write_header(out, ctb, iobuf_get_temp_length(a) );
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if( iobuf_write_temp( out, a ) )
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rc = G10ERR_WRITE_FILE;
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leave:
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iobuf_close(a);
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return rc;
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}
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static u32
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calc_plaintext( PKT_plaintext *pt )
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{
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return pt->len? (1 + 1 + pt->namelen + 4 + pt->len) : 0;
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}
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static int
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do_plaintext( IOBUF out, int ctb, PKT_plaintext *pt )
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{
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int c, i, rc = 0;
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u32 n;
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write_header(out, ctb, calc_plaintext( pt ) );
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iobuf_put(out, pt->mode );
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iobuf_put(out, pt->namelen );
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for(i=0; i < pt->namelen; i++ )
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iobuf_put(out, pt->name[i] );
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if( write_32(out, pt->timestamp ) )
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rc = G10ERR_WRITE_FILE;
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n = 0;
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while( (c=iobuf_get(pt->buf)) != -1 ) {
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if( iobuf_put(out, c) ) {
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rc = G10ERR_WRITE_FILE;
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break;
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}
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n++;
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}
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if( !pt->len )
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iobuf_set_block_mode(out, 0 ); /* write end marker */
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else if( n != pt->len )
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log_error("do_plaintext(): wrote %lu bytes but expected %lu bytes\n",
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(ulong)n, (ulong)pt->len );
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return rc;
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}
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static int
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do_encr_data( IOBUF out, int ctb, PKT_encr_data *ed )
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{
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int rc = 0;
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u32 n;
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n = ed->len ? (ed->len + 10) : 0;
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write_header(out, ctb, n );
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/* This is all. The caller has to write the real data */
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return rc;
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}
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static int
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write_16(IOBUF out, u16 a)
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{
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iobuf_put(out, a>>8);
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if( iobuf_put(out,a) )
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return -1;
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return 0;
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}
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static int
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write_32(IOBUF out, u32 a)
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{
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iobuf_put(out, a>> 24);
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iobuf_put(out, a>> 16);
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iobuf_put(out, a>> 8);
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if( iobuf_put(out, a) )
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return -1;
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return 0;
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}
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/****************
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* calculate the length of a header
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*/
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static int
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calc_header_length( u32 len )
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{
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if( !len )
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return 1; /* only the ctb */
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else if( len < 256 )
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return 2;
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else if( len < 65536 )
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return 3;
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else
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return 5;
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}
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/****************
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* Write the CTB and the packet length
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*/
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static int
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write_header( IOBUF out, int ctb, u32 len )
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{
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if( !len )
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ctb |= 3;
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else if( len < 256 )
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;
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else if( len < 65536 )
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ctb |= 1;
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else
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ctb |= 2;
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if( iobuf_put(out, ctb ) )
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return -1;
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if( !len ) {
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iobuf_set_block_mode(out, 8196 );
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}
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else {
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if( ctb & 2 ) {
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iobuf_put(out, len >> 24 );
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iobuf_put(out, len >> 16 );
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}
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if( ctb & 3 )
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iobuf_put(out, len >> 8 );
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if( iobuf_put(out, len ) )
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return -1;
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}
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return 0;
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}
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static int
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write_version( IOBUF out, int ctb )
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{
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if( iobuf_put( out, 3 ) )
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return -1;
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return 0;
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}
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