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-rw-r--r--g10/pubkey-enc.c296
1 files changed, 0 insertions, 296 deletions
diff --git a/g10/pubkey-enc.c b/g10/pubkey-enc.c
deleted file mode 100644
index 2c8771c27..000000000
--- a/g10/pubkey-enc.c
+++ /dev/null
@@ -1,296 +0,0 @@
-/* pubkey-enc.c - public key encoded packet handling
- * Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
- *
- * This file is part of GnuPG.
- *
- * GnuPG 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.
- *
- * GnuPG 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
- */
-
-#include <config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <assert.h>
-#include "util.h"
-#include "memory.h"
-#include "packet.h"
-#include "mpi.h"
-#include "keydb.h"
-#include "trustdb.h"
-#include "cipher.h"
-#include "status.h"
-#include "options.h"
-#include "main.h"
-#include "i18n.h"
-
-static int get_it( PKT_pubkey_enc *k,
- DEK *dek, PKT_secret_key *sk, u32 *keyid );
-
-
-/* check that the given algo is mentioned in one of the valid user IDs */
-static int
-is_algo_in_prefs ( KBNODE keyblock, preftype_t type, int algo )
-{
- KBNODE k;
-
- for (k=keyblock; k; k=k->next) {
- if (k->pkt->pkttype == PKT_USER_ID) {
- PKT_user_id *uid = k->pkt->pkt.user_id;
- prefitem_t *prefs = uid->prefs;
-
- if (uid->created && prefs &&
- !uid->is_revoked && !uid->is_expired ) {
- for (; prefs->type; prefs++ )
- if (prefs->type == type && prefs->value == algo)
- return 1;
- }
- }
- }
- return 0;
-}
-
-
-/****************
- * Get the session key from a pubkey enc packet and return
- * it in DEK, which should have been allocated in secure memory.
- */
-int
-get_session_key( PKT_pubkey_enc *k, DEK *dek )
-{
- PKT_secret_key *sk = NULL;
- int rc;
-
- rc = check_pubkey_algo2 (k->pubkey_algo, PUBKEY_USAGE_ENC);
- if( rc )
- goto leave;
-
- if( (k->keyid[0] || k->keyid[1]) && !opt.try_all_secrets ) {
- sk = m_alloc_clear( sizeof *sk );
- sk->pubkey_algo = k->pubkey_algo; /* we want a pubkey with this algo*/
- if( !(rc = get_seckey( sk, k->keyid )) )
- rc = get_it( k, dek, sk, k->keyid );
- }
- else { /* anonymous receiver: Try all available secret keys */
- void *enum_context = NULL;
- u32 keyid[2];
-
- for(;;) {
- if( sk )
- free_secret_key( sk );
- sk = m_alloc_clear( sizeof *sk );
- rc=enum_secret_keys( &enum_context, sk, 1);
- if( rc ) {
- rc = G10ERR_NO_SECKEY;
- break;
- }
- if( sk->pubkey_algo != k->pubkey_algo )
- continue;
- keyid_from_sk( sk, keyid );
- log_info(_("anonymous recipient; trying secret key %08lX ...\n"),
- (ulong)keyid[1] );
- rc = check_secret_key( sk, 1 ); /* ask only once */
- if( !rc )
- rc = get_it( k, dek, sk, keyid );
- if( !rc ) {
- log_info(_("okay, we are the anonymous recipient.\n") );
- break;
- }
- }
- enum_secret_keys( &enum_context, NULL, 0 ); /* free context */
- }
-
- leave:
- if( sk )
- free_secret_key( sk );
- return rc;
-}
-
-
-static int
-get_it( PKT_pubkey_enc *enc, DEK *dek, PKT_secret_key *sk, u32 *keyid )
-{
- int rc;
- MPI plain_dek = NULL;
- byte *frame = NULL;
- unsigned n, nframe;
- u16 csum, csum2;
-
- rc = pubkey_decrypt(sk->pubkey_algo, &plain_dek, enc->data, sk->skey );
- if( rc )
- goto leave;
- frame = mpi_get_buffer( plain_dek, &nframe, NULL );
- mpi_free( plain_dek ); plain_dek = NULL;
-
- /* Now get the DEK (data encryption key) from the frame
- *
- * Old versions encode the DEK in in this format (msb is left):
- *
- * 0 1 DEK(16 bytes) CSUM(2 bytes) 0 RND(n bytes) 2
- *
- * Later versions encode the DEK like this:
- *
- * 0 2 RND(n bytes) 0 A DEK(k bytes) CSUM(2 bytes)
- *
- * (mpi_get_buffer already removed the leading zero).
- *
- * RND are non-zero randow bytes.
- * A is the cipher algorithm
- * DEK is the encryption key (session key) with length k
- * CSUM
- */
- if( DBG_CIPHER )
- log_hexdump("DEK frame:", frame, nframe );
- n=0;
- if( n + 7 > nframe )
- { rc = G10ERR_WRONG_SECKEY; goto leave; }
- if( frame[n] == 1 && frame[nframe-1] == 2 ) {
- log_info(_("old encoding of the DEK is not supported\n"));
- rc = G10ERR_CIPHER_ALGO;
- goto leave;
- }
- if( frame[n] != 2 ) /* somethink is wrong */
- { rc = G10ERR_WRONG_SECKEY; goto leave; }
- for(n++; n < nframe && frame[n]; n++ ) /* skip the random bytes */
- ;
- n++; /* and the zero byte */
- if( n + 4 > nframe )
- { rc = G10ERR_WRONG_SECKEY; goto leave; }
-
- dek->keylen = nframe - (n+1) - 2;
- dek->algo = frame[n++];
- if( dek->algo == CIPHER_ALGO_IDEA )
- write_status(STATUS_RSA_OR_IDEA);
- rc = check_cipher_algo( dek->algo );
- if( rc ) {
- if( !opt.quiet && rc == G10ERR_CIPHER_ALGO ) {
- log_info(_("cipher algorithm %d%s is unknown or disabled\n"),
- dek->algo, dek->algo == CIPHER_ALGO_IDEA? " (IDEA)":"");
- if(dek->algo==CIPHER_ALGO_IDEA)
- idea_cipher_warn(0);
- }
- dek->algo = 0;
- goto leave;
- }
- if( (dek->keylen*8) != cipher_get_keylen( dek->algo ) ) {
- rc = G10ERR_WRONG_SECKEY;
- goto leave;
- }
-
- /* copy the key to DEK and compare the checksum */
- csum = frame[nframe-2] << 8;
- csum |= frame[nframe-1];
- memcpy( dek->key, frame+n, dek->keylen );
- for( csum2=0, n=0; n < dek->keylen; n++ )
- csum2 += dek->key[n];
- if( csum != csum2 ) {
- rc = G10ERR_WRONG_SECKEY;
- goto leave;
- }
- if( DBG_CIPHER )
- log_hexdump("DEK is:", dek->key, dek->keylen );
- /* check that the algo is in the preferences and whether it has expired */
- {
- PKT_public_key *pk = NULL;
- KBNODE pkb = get_pubkeyblock (keyid);
-
- if( !pkb ) {
- rc = -1;
- log_error("oops: public key not found for preference check\n");
- }
- else if( pkb->pkt->pkt.public_key->selfsigversion > 3
- && dek->algo != CIPHER_ALGO_3DES
- && !is_algo_in_prefs( pkb, PREFTYPE_SYM, dek->algo ) ) {
- /* Don't print a note while we are not on verbose mode,
- * the cipher is blowfish and the preferences have twofish
- * listed */
- if( opt.verbose || dek->algo != CIPHER_ALGO_BLOWFISH
- || !is_algo_in_prefs( pkb, PREFTYPE_SYM, CIPHER_ALGO_TWOFISH))
- log_info(_(
- "NOTE: cipher algorithm %d not found in preferences\n"),
- dek->algo );
- }
-
- if (!rc) {
- KBNODE k;
-
- for (k=pkb; k; k = k->next) {
- if (k->pkt->pkttype == PKT_PUBLIC_KEY
- || k->pkt->pkttype == PKT_PUBLIC_SUBKEY){
- u32 aki[2];
- keyid_from_pk(k->pkt->pkt.public_key, aki);
-
- if (aki[0]==keyid[0] && aki[1]==keyid[1]) {
- pk = k->pkt->pkt.public_key;
- break;
- }
- }
- }
- if (!pk)
- BUG ();
- if ( pk->expiredate && pk->expiredate <= make_timestamp() ) {
- log_info(_("NOTE: secret key %08lX expired at %s\n"),
- (ulong)keyid[1], asctimestamp( pk->expiredate) );
- }
- }
-
- if ( pk->is_revoked ) {
- log_info( _("NOTE: key has been revoked") );
- putc( '\n', log_stream() );
- show_revocation_reason( pk, 1 );
- }
-
- release_kbnode (pkb);
- rc = 0;
- }
-
-
- leave:
- mpi_free(plain_dek);
- m_free(frame);
- return rc;
-}
-
-
-/****************
- * Get the session key from the given string.
- * String is supposed to be formatted as this:
- * <algo-id>:<even-number-of-hex-digits>
- */
-int
-get_override_session_key( DEK *dek, const char *string )
-{
- const char *s;
- int i;
-
- if ( !string )
- return G10ERR_BAD_KEY;
- dek->algo = atoi(string);
- if ( dek->algo < 1 )
- return G10ERR_BAD_KEY;
- if ( !(s = strchr ( string, ':' )) )
- return G10ERR_BAD_KEY;
- s++;
- for(i=0; i < DIM(dek->key) && *s; i++, s +=2 ) {
- int c = hextobyte ( s );
- if (c == -1)
- return G10ERR_BAD_KEY;
- dek->key[i] = c;
- }
- if ( *s )
- return G10ERR_BAD_KEY;
- dek->keylen = i;
- return 0;
-}
-
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