mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-04 20:38:50 +01:00
4830eb7cae
don't know the structure of by using the opaque MPI. (do_fingerprint_md_sk): We cannot calculate the fingerprint from a secret key unless we know the structure (since we can't leave off the secret key parts), so fail early..... (keyid_from_sk, fingerprint_from_sk): .... and return all zeroes.
546 lines
12 KiB
C
546 lines
12 KiB
C
/* keyid.c - key ID and fingerprint handling
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* Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG 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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* GnuPG 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 <errno.h>
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#include <time.h>
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#include <assert.h>
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#include "util.h"
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#include "main.h"
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#include "packet.h"
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#include "options.h"
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#include "mpi.h"
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#include "keydb.h"
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#include "i18n.h"
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int
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pubkey_letter( int algo )
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{
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switch( algo ) {
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case PUBKEY_ALGO_RSA: return 'R' ;
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case PUBKEY_ALGO_RSA_E: return 'r' ;
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case PUBKEY_ALGO_RSA_S: return 's' ;
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case PUBKEY_ALGO_ELGAMAL_E: return 'g';
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case PUBKEY_ALGO_ELGAMAL: return 'G' ;
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case PUBKEY_ALGO_DSA: return 'D' ;
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default: return '?';
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}
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}
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static MD_HANDLE
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do_fingerprint_md( PKT_public_key *pk )
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{
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MD_HANDLE md;
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unsigned n;
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unsigned nb[PUBKEY_MAX_NPKEY];
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unsigned nn[PUBKEY_MAX_NPKEY];
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byte *pp[PUBKEY_MAX_NPKEY];
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int i;
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int npkey = pubkey_get_npkey( pk->pubkey_algo );
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md = md_open( pk->version < 4 ? DIGEST_ALGO_RMD160 : DIGEST_ALGO_SHA1, 0);
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n = pk->version < 4 ? 8 : 6;
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if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
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{
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pp[0]=mpi_get_opaque(pk->pkey[0],&nn[0]);
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n+=nn[0];
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}
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else
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for(i=0; i < npkey; i++ )
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{
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nb[i] = mpi_get_nbits(pk->pkey[i]);
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pp[i] = mpi_get_buffer( pk->pkey[i], nn+i, NULL );
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n += 2 + nn[i];
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}
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md_putc( md, 0x99 ); /* ctb */
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md_putc( md, n >> 8 ); /* 2 byte length header */
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md_putc( md, n );
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if( pk->version < 4 )
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md_putc( md, 3 );
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else
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md_putc( md, 4 );
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{ u32 a = pk->timestamp;
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md_putc( md, a >> 24 );
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md_putc( md, a >> 16 );
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md_putc( md, a >> 8 );
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md_putc( md, a );
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}
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if( pk->version < 4 ) {
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u16 a;
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if( pk->expiredate )
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a = (u16)((pk->expiredate - pk->timestamp) / 86400L);
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else
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a = 0;
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md_putc( md, a >> 8 );
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md_putc( md, a );
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}
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md_putc( md, pk->pubkey_algo );
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if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
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md_write(md,pp[0],nn[0]);
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else
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for(i=0; i < npkey; i++ )
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{
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md_putc( md, nb[i]>>8);
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md_putc( md, nb[i] );
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md_write( md, pp[i], nn[i] );
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m_free(pp[i]);
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}
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md_final( md );
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return md;
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}
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static MD_HANDLE
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do_fingerprint_md_sk( PKT_secret_key *sk )
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{
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PKT_public_key pk;
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int npkey = pubkey_get_npkey( sk->pubkey_algo ); /* npkey is correct! */
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int i;
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if(npkey==0)
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return NULL;
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pk.pubkey_algo = sk->pubkey_algo;
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pk.version = sk->version;
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pk.timestamp = sk->timestamp;
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pk.expiredate = sk->expiredate;
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pk.pubkey_algo = sk->pubkey_algo;
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for( i=0; i < npkey; i++ )
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pk.pkey[i] = sk->skey[i];
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return do_fingerprint_md( &pk );
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}
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/****************
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* Get the keyid from the secret key and put it into keyid
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* if this is not NULL. Return the 32 low bits of the keyid.
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*/
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u32
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keyid_from_sk( PKT_secret_key *sk, u32 *keyid )
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{
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u32 lowbits;
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u32 dummy_keyid[2];
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if( !keyid )
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keyid = dummy_keyid;
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if( sk->version < 4 && is_RSA(sk->pubkey_algo) ) {
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lowbits = pubkey_get_npkey(sk->pubkey_algo) ?
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mpi_get_keyid( sk->skey[0], keyid ) : 0; /* take n */
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}
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else {
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const byte *dp;
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MD_HANDLE md;
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md = do_fingerprint_md_sk(sk);
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if(md)
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{
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dp = md_read( md, 0 );
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keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
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keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
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lowbits = keyid[1];
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md_close(md);
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}
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else
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keyid[0]=keyid[1]=0;
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}
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return lowbits;
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}
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/****************
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* Get the keyid from the public key and put it into keyid
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* if this is not NULL. Return the 32 low bits of the keyid.
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*/
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u32
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keyid_from_pk( PKT_public_key *pk, u32 *keyid )
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{
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u32 lowbits;
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u32 dummy_keyid[2];
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if( !keyid )
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keyid = dummy_keyid;
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if( pk->keyid[0] || pk->keyid[1] ) {
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keyid[0] = pk->keyid[0];
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keyid[1] = pk->keyid[1];
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lowbits = keyid[1];
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}
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else if( pk->version < 4 && is_RSA(pk->pubkey_algo) ) {
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lowbits = pubkey_get_npkey(pk->pubkey_algo) ?
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mpi_get_keyid( pk->pkey[0], keyid ) : 0 ; /* from n */
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pk->keyid[0] = keyid[0];
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pk->keyid[1] = keyid[1];
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}
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else {
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const byte *dp;
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MD_HANDLE md;
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md = do_fingerprint_md(pk);
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dp = md_read( md, 0 );
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keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
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keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
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lowbits = keyid[1];
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md_close(md);
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pk->keyid[0] = keyid[0];
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pk->keyid[1] = keyid[1];
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}
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return lowbits;
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}
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/****************
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* Get the keyid from the fingerprint. This function is simple for most
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* keys, but has to do a keylookup for old stayle keys.
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*/
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u32
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keyid_from_fingerprint( const byte *fprint, size_t fprint_len, u32 *keyid )
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{
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u32 dummy_keyid[2];
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if( !keyid )
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keyid = dummy_keyid;
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if( fprint_len != 20 ) {
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/* This is special as we have to lookup the key first */
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PKT_public_key pk;
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int rc;
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memset( &pk, 0, sizeof pk );
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rc = get_pubkey_byfprint( &pk, fprint, fprint_len );
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if( rc ) {
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log_error("Oops: keyid_from_fingerprint: no pubkey\n");
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keyid[0] = 0;
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keyid[1] = 0;
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}
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else
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keyid_from_pk( &pk, keyid );
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}
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else {
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const byte *dp = fprint;
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keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
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keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
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}
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return keyid[1];
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}
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u32
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keyid_from_sig( PKT_signature *sig, u32 *keyid )
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{
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if( keyid ) {
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keyid[0] = sig->keyid[0];
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keyid[1] = sig->keyid[1];
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}
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return sig->keyid[1];
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}
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byte *
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namehash_from_uid(PKT_user_id *uid)
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{
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if(uid->namehash==NULL)
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{
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uid->namehash=m_alloc(20);
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if(uid->attrib_data)
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rmd160_hash_buffer(uid->namehash,uid->attrib_data,uid->attrib_len);
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else
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rmd160_hash_buffer(uid->namehash,uid->name,uid->len);
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}
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return uid->namehash;
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}
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/****************
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* return the number of bits used in the pk
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*/
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unsigned
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nbits_from_pk( PKT_public_key *pk )
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{
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return pubkey_nbits( pk->pubkey_algo, pk->pkey );
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}
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/****************
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* return the number of bits used in the sk
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*/
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unsigned
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nbits_from_sk( PKT_secret_key *sk )
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{
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return pubkey_nbits( sk->pubkey_algo, sk->skey );
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}
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static const char *
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mk_datestr (char *buffer, time_t atime)
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{
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struct tm *tp;
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if ( atime < 0 ) /* 32 bit time_t and after 2038-01-19 */
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strcpy (buffer, "????" "-??" "-??"); /* mark this as invalid */
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else {
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tp = gmtime (&atime);
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sprintf (buffer,"%04d-%02d-%02d",
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1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
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}
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return buffer;
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}
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/****************
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* return a string with the creation date of the pk
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* Note: this is alloced in a static buffer.
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* Format is: yyyy-mm-dd
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*/
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const char *
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datestr_from_pk( PKT_public_key *pk )
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{
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static char buffer[11+5];
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time_t atime = pk->timestamp;
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return mk_datestr (buffer, atime);
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}
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const char *
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datestr_from_sk( PKT_secret_key *sk )
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{
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static char buffer[11+5];
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time_t atime = sk->timestamp;
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return mk_datestr (buffer, atime);
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}
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const char *
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datestr_from_sig( PKT_signature *sig )
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{
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static char buffer[11+5];
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time_t atime = sig->timestamp;
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return mk_datestr (buffer, atime);
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}
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const char *
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expirestr_from_pk( PKT_public_key *pk )
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{
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static char buffer[11+5];
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time_t atime;
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if( !pk->expiredate )
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return _("never ");
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atime = pk->expiredate;
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return mk_datestr (buffer, atime);
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}
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const char *
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expirestr_from_sk( PKT_secret_key *sk )
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{
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static char buffer[11+5];
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time_t atime;
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if( !sk->expiredate )
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return _("never ");
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atime = sk->expiredate;
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return mk_datestr (buffer, atime);
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}
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const char *
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expirestr_from_sig( PKT_signature *sig )
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{
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static char buffer[11+5];
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time_t atime;
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if(!sig->expiredate)
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return _("never ");
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atime=sig->expiredate;
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return mk_datestr (buffer, atime);
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}
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const char *
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colon_strtime (u32 t)
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{
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if (!t)
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return "";
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if (opt.fixed_list_mode) {
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static char buf[15];
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sprintf (buf, "%lu", (ulong)t);
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return buf;
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}
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return strtimestamp(t);
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}
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const char *
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colon_datestr_from_pk (PKT_public_key *pk)
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{
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if (opt.fixed_list_mode) {
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static char buf[15];
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sprintf (buf, "%lu", (ulong)pk->timestamp);
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return buf;
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}
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return datestr_from_pk (pk);
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}
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const char *
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colon_datestr_from_sk (PKT_secret_key *sk)
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{
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if (opt.fixed_list_mode) {
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static char buf[15];
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sprintf (buf, "%lu", (ulong)sk->timestamp);
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return buf;
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}
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return datestr_from_sk (sk);
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}
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const char *
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colon_datestr_from_sig (PKT_signature *sig)
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{
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if (opt.fixed_list_mode) {
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static char buf[15];
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sprintf (buf, "%lu", (ulong)sig->timestamp);
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return buf;
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}
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return datestr_from_sig (sig);
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}
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const char *
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colon_expirestr_from_sig (PKT_signature *sig)
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{
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if(!sig->expiredate)
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return "";
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if (opt.fixed_list_mode) {
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static char buf[15];
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sprintf (buf, "%lu", (ulong)sig->expiredate);
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return buf;
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}
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return expirestr_from_sig (sig);
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}
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/**************** .
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* Return a byte array with the fingerprint for the given PK/SK
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* The length of the array is returned in ret_len. Caller must free
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* the array or provide an array of length MAX_FINGERPRINT_LEN.
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*/
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byte *
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fingerprint_from_pk( PKT_public_key *pk, byte *array, size_t *ret_len )
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{
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byte *p, *buf;
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const byte *dp;
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size_t len;
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unsigned int n;
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if( pk->version < 4 && is_RSA(pk->pubkey_algo) ) {
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/* RSA in version 3 packets is special */
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MD_HANDLE md;
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md = md_open( DIGEST_ALGO_MD5, 0);
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if( pubkey_get_npkey( pk->pubkey_algo ) > 1 ) {
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p = buf = mpi_get_buffer( pk->pkey[0], &n, NULL );
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md_write( md, p, n );
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m_free(buf);
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p = buf = mpi_get_buffer( pk->pkey[1], &n, NULL );
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md_write( md, p, n );
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m_free(buf);
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}
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md_final(md);
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if( !array )
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array = m_alloc( 16 );
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len = 16;
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memcpy(array, md_read(md, DIGEST_ALGO_MD5), 16 );
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md_close(md);
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}
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else {
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MD_HANDLE md;
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md = do_fingerprint_md(pk);
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dp = md_read( md, 0 );
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len = md_digest_length( md_get_algo( md ) );
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assert( len <= MAX_FINGERPRINT_LEN );
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if( !array )
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array = m_alloc( len );
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memcpy(array, dp, len );
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pk->keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
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pk->keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
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md_close(md);
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}
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*ret_len = len;
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return array;
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}
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byte *
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fingerprint_from_sk( PKT_secret_key *sk, byte *array, size_t *ret_len )
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{
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byte *p, *buf;
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const char *dp;
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size_t len;
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unsigned n;
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if( sk->version < 4 && is_RSA(sk->pubkey_algo) ) {
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/* RSA in version 3 packets is special */
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MD_HANDLE md;
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md = md_open( DIGEST_ALGO_MD5, 0);
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if( pubkey_get_npkey( sk->pubkey_algo ) > 1 ) {
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p = buf = mpi_get_buffer( sk->skey[0], &n, NULL );
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md_write( md, p, n );
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m_free(buf);
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p = buf = mpi_get_buffer( sk->skey[1], &n, NULL );
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md_write( md, p, n );
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m_free(buf);
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}
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md_final(md);
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if( !array )
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array = m_alloc( 16 );
|
|
len = 16;
|
|
memcpy(array, md_read(md, DIGEST_ALGO_MD5), 16 );
|
|
md_close(md);
|
|
}
|
|
else {
|
|
MD_HANDLE md;
|
|
md = do_fingerprint_md_sk(sk);
|
|
if(md)
|
|
{
|
|
dp = md_read( md, 0 );
|
|
len = md_digest_length( md_get_algo( md ) );
|
|
assert( len <= MAX_FINGERPRINT_LEN );
|
|
if( !array )
|
|
array = m_alloc( len );
|
|
memcpy(array, dp, len );
|
|
md_close(md);
|
|
}
|
|
else
|
|
{
|
|
len=MAX_FINGERPRINT_LEN;
|
|
if(!array)
|
|
array=m_alloc(len);
|
|
memset(array,0,len);
|
|
}
|
|
}
|
|
|
|
*ret_len = len;
|
|
return array;
|
|
}
|