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gnupg/g10/keyid.c

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/* keyid.c - key ID and fingerprint handling
* Copyright (C) 1998, 1999, 2000, 2001, 2003 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 <errno.h>
#include <time.h>
#include <assert.h>
#include "gpg.h"
#include "util.h"
#include "main.h"
#include "packet.h"
#include "options.h"
#include "mpi.h"
#include "keydb.h"
#include "i18n.h"
int
pubkey_letter( int algo )
{
switch( algo ) {
case PUBKEY_ALGO_RSA: return 'R' ;
case PUBKEY_ALGO_RSA_E: return 'r' ;
case PUBKEY_ALGO_RSA_S: return 's' ;
case PUBKEY_ALGO_ELGAMAL_E: return 'g';
case PUBKEY_ALGO_ELGAMAL: return 'G' ;
case PUBKEY_ALGO_DSA: return 'D' ;
default: return '?';
}
}
static gcry_md_hd_t
do_fingerprint_md( PKT_public_key *pk )
{
gcry_md_hd_t md;
unsigned int n;
unsigned int nn[PUBKEY_MAX_NPKEY];
byte *pp[PUBKEY_MAX_NPKEY];
int i;
int npkey = pubkey_get_npkey( pk->pubkey_algo );
gcry_md_open (&md, pk->version < 4 ? DIGEST_ALGO_RMD160
: DIGEST_ALGO_SHA1, 0);
n = pk->version < 4 ? 8 : 6;
for(i=0; i < npkey; i++ ) {
size_t nbytes;
if (gcry_mpi_print( GCRYMPI_FMT_PGP, NULL, 0, &nbytes, pk->pkey[i] ))
BUG ();
/* fixme: we should try to allocate a buffer on the stack */
pp[i] = xmalloc(nbytes);
if (gcry_mpi_print ( GCRYMPI_FMT_PGP, pp[i], nbytes, &nbytes,
pk->pkey[i] ))
BUG ();
nn[i] = nbytes;
n += nn[i];
}
gcry_md_putc ( md, 0x99 ); /* ctb */
gcry_md_putc ( md, n >> 8 ); /* 2 byte length header */
gcry_md_putc ( md, n );
if( pk->version < 4 )
gcry_md_putc ( md, 3 );
else
gcry_md_putc ( md, 4 );
{ u32 a = pk->timestamp;
gcry_md_putc ( md, a >> 24 );
gcry_md_putc ( md, a >> 16 );
gcry_md_putc ( md, a >> 8 );
gcry_md_putc ( md, a );
}
if( pk->version < 4 ) {
u16 a;
if( pk->expiredate )
a = (u16)((pk->expiredate - pk->timestamp) / 86400L);
else
a = 0;
gcry_md_putc ( md, a >> 8 );
gcry_md_putc ( md, a );
}
gcry_md_putc ( md, pk->pubkey_algo );
for(i=0; i < npkey; i++ ) {
gcry_md_write( md, pp[i], nn[i] );
xfree (pp[i]);
}
gcry_md_final ( md );
return md;
}
static gcry_md_hd_t
do_fingerprint_md_sk( PKT_secret_key *sk )
{
PKT_public_key pk;
int npkey = pubkey_get_npkey( sk->pubkey_algo ); /* npkey is correct! */
int i;
pk.pubkey_algo = sk->pubkey_algo;
pk.version = sk->version;
pk.timestamp = sk->timestamp;
pk.expiredate = sk->expiredate;
pk.pubkey_algo = sk->pubkey_algo;
for( i=0; i < npkey; i++ )
pk.pkey[i] = sk->skey[i];
return do_fingerprint_md( &pk );
}
u32
v3_keyid (gcry_mpi_t a, u32 *ki)
{
byte *buffer;
size_t nbytes;
if (gcry_mpi_print (GCRYMPI_FMT_USG, NULL, 0, &nbytes, a ))
BUG ();
/* fixme: allocate it on the stack */
buffer = xmalloc (nbytes);
if (gcry_mpi_print( GCRYMPI_FMT_USG, buffer, nbytes, NULL, a ))
BUG ();
if (nbytes < 8) /* oops */
ki[0] = ki[1] = 0;
else
{
memcpy (ki+0, buffer+nbytes-8, 4);
memcpy (ki+1, buffer+nbytes-4, 4);
}
xfree (buffer);
return ki[1];
}
/****************
* Get the keyid from the secret key and put it into keyid
* if this is not NULL. Return the 32 low bits of the keyid.
*/
u32
keyid_from_sk( PKT_secret_key *sk, u32 *keyid )
{
u32 lowbits;
u32 dummy_keyid[2];
if( !keyid )
keyid = dummy_keyid;
if( sk->version < 4 && is_RSA(sk->pubkey_algo) ) {
keyid[0] = keyid[1] = 0;
lowbits = pubkey_get_npkey(sk->pubkey_algo) ?
v3_keyid (sk->skey[0], keyid) : 0;
}
else {
const byte *dp;
gcry_md_hd_t md;
md = do_fingerprint_md_sk(sk);
dp = gcry_md_read ( md, 0 );
keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
lowbits = keyid[1];
gcry_md_close (md);
}
return lowbits;
}
/****************
* Get the keyid from the public key and put it into keyid
* if this is not NULL. Return the 32 low bits of the keyid.
*/
u32
keyid_from_pk( PKT_public_key *pk, u32 *keyid )
{
u32 lowbits;
u32 dummy_keyid[2];
if( !keyid )
keyid = dummy_keyid;
if( pk->keyid[0] || pk->keyid[1] ) {
keyid[0] = pk->keyid[0];
keyid[1] = pk->keyid[1];
lowbits = keyid[1];
}
else if( pk->version < 4 && is_RSA(pk->pubkey_algo) ) {
keyid[0] = keyid[1] = 0;
lowbits = pubkey_get_npkey(pk->pubkey_algo) ?
v3_keyid (pk->pkey[0], keyid) : 0 ;
pk->keyid[0] = keyid[0];
pk->keyid[1] = keyid[1];
}
else {
const byte *dp;
gcry_md_hd_t md;
md = do_fingerprint_md(pk);
dp = gcry_md_read ( md, 0 );
keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
lowbits = keyid[1];
gcry_md_close (md);
pk->keyid[0] = keyid[0];
pk->keyid[1] = keyid[1];
}
return lowbits;
}
/****************
* Get the keyid from the fingerprint. This function is simple for most
* keys, but has to do a keylookup for old stayle keys.
*/
u32
keyid_from_fingerprint( const byte *fprint, size_t fprint_len, u32 *keyid )
{
u32 dummy_keyid[2];
if( !keyid )
keyid = dummy_keyid;
if( fprint_len != 20 ) {
/* This is special as we have to lookup the key first */
PKT_public_key pk;
int rc;
memset( &pk, 0, sizeof pk );
rc = get_pubkey_byfprint( &pk, fprint, fprint_len );
if( rc ) {
log_error("Oops: keyid_from_fingerprint: no pubkey\n");
keyid[0] = 0;
keyid[1] = 0;
}
else
keyid_from_pk( &pk, keyid );
}
else {
const byte *dp = fprint;
keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
}
return keyid[1];
}
u32
keyid_from_sig( PKT_signature *sig, u32 *keyid )
{
if( keyid ) {
keyid[0] = sig->keyid[0];
keyid[1] = sig->keyid[1];
}
return sig->keyid[1];
}
byte *
namehash_from_uid(PKT_user_id *uid)
{
if(uid->namehash==NULL)
{
uid->namehash=xmalloc (20);
if(uid->attrib_data)
gcry_md_hash_buffer (GCRY_MD_RMD160, uid->namehash,
uid->attrib_data,uid->attrib_len);
else
gcry_md_hash_buffer (GCRY_MD_RMD160, uid->namehash,
uid->name,uid->len);
}
return uid->namehash;
}
/****************
* return the number of bits used in the pk
*/
unsigned
nbits_from_pk( PKT_public_key *pk )
{
return pubkey_nbits( pk->pubkey_algo, pk->pkey );
}
/****************
* return the number of bits used in the sk
*/
unsigned
nbits_from_sk( PKT_secret_key *sk )
{
return pubkey_nbits( sk->pubkey_algo, sk->skey );
}
static const char *
mk_datestr (char *buffer, time_t atime)
{
struct tm *tp;
if ( atime < 0 ) /* 32 bit time_t and after 2038-01-19 */
strcpy (buffer, "????" "-??" "-??"); /* mark this as invalid */
else {
tp = gmtime (&atime);
sprintf (buffer,"%04d-%02d-%02d",
1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
}
return buffer;
}
/****************
* return a string with the creation date of the pk
* Note: this is alloced in a static buffer.
* Format is: yyyy-mm-dd
*/
const char *
datestr_from_pk( PKT_public_key *pk )
{
static char buffer[11+5];
time_t atime = pk->timestamp;
return mk_datestr (buffer, atime);
}
const char *
datestr_from_sk( PKT_secret_key *sk )
{
static char buffer[11+5];
time_t atime = sk->timestamp;
return mk_datestr (buffer, atime);
}
const char *
datestr_from_sig( PKT_signature *sig )
{
static char buffer[11+5];
time_t atime = sig->timestamp;
return mk_datestr (buffer, atime);
}
const char *
expirestr_from_pk( PKT_public_key *pk )
{
static char buffer[11+5];
time_t atime;
if( !pk->expiredate )
return _("never ");
atime = pk->expiredate;
return mk_datestr (buffer, atime);
}
const char *
expirestr_from_sk( PKT_secret_key *sk )
{
static char buffer[11+5];
time_t atime;
if( !sk->expiredate )
return _("never ");
atime = sk->expiredate;
return mk_datestr (buffer, atime);
}
const char *
expirestr_from_sig( PKT_signature *sig )
{
static char buffer[11+5];
time_t atime;
if(!sig->expiredate)
return _("never ");
atime=sig->expiredate;
return mk_datestr (buffer, atime);
}
const char *
colon_strtime (u32 t)
{
if (!t)
return "";
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)t);
return buf;
}
return strtimestamp(t);
}
const char *
colon_datestr_from_pk (PKT_public_key *pk)
{
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)pk->timestamp);
return buf;
}
return datestr_from_pk (pk);
}
const char *
colon_datestr_from_sk (PKT_secret_key *sk)
{
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)sk->timestamp);
return buf;
}
return datestr_from_sk (sk);
}
const char *
colon_datestr_from_sig (PKT_signature *sig)
{
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)sig->timestamp);
return buf;
}
return datestr_from_sig (sig);
}
const char *
colon_expirestr_from_sig (PKT_signature *sig)
{
if(!sig->expiredate)
return "";
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)sig->expiredate);
return buf;
}
return expirestr_from_sig (sig);
}
/**************** .
* Return a byte array with the fingerprint for the given PK/SK
* The length of the array is returned in ret_len. Caller must free
* the array or provide an array of length MAX_FINGERPRINT_LEN.
*/
byte *
fingerprint_from_pk( PKT_public_key *pk, byte *array, size_t *ret_len )
{
byte *buf;
const byte *dp;
size_t len;
if( pk->version < 4 && is_RSA(pk->pubkey_algo) ) {
/* RSA in version 3 packets is special */
gcry_md_hd_t md;
gcry_md_open (&md, DIGEST_ALGO_MD5, 0);
if( pubkey_get_npkey( pk->pubkey_algo ) > 1 ) {
size_t nbytes;
if (gcry_mpi_print( GCRYMPI_FMT_USG, NULL, 0, &nbytes,
pk->pkey[0]))
BUG ();
/* fixme: allocate it on the stack */
buf = xmalloc(nbytes);
if (gcry_mpi_print (GCRYMPI_FMT_USG, buf, nbytes, NULL,pk->pkey[0]))
BUG ();
gcry_md_write (md, buf, nbytes);
xfree (buf);
if (gcry_mpi_print( GCRYMPI_FMT_USG, NULL, 0, &nbytes, pk->pkey[1]))
BUG ();
/* fixme: allocate it on the stack */
buf = xmalloc(nbytes);
if (gcry_mpi_print( GCRYMPI_FMT_USG, buf, nbytes, NULL,pk->pkey[1]))
BUG ();
gcry_md_write( md, buf, nbytes );
xfree(buf);
}
gcry_md_final (md);
if( !array )
array = xmalloc ( 16 );
len = 16;
memcpy(array, gcry_md_read (md, DIGEST_ALGO_MD5), 16 );
gcry_md_close (md);
}
else {
gcry_md_hd_t md;
md = do_fingerprint_md(pk);
dp = gcry_md_read ( md, 0 );
len = gcry_md_get_algo_dlen (gcry_md_get_algo (md));
assert( len <= MAX_FINGERPRINT_LEN );
if( !array )
array = xmalloc ( len );
memcpy(array, dp, len );
pk->keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
pk->keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
gcry_md_close (md);
}
*ret_len = len;
return array;
}
byte *
fingerprint_from_sk( PKT_secret_key *sk, byte *array, size_t *ret_len )
{
byte *buf;
const char *dp;
size_t len;
if( sk->version < 4 && is_RSA(sk->pubkey_algo) ) {
/* RSA in version 3 packets is special */
gcry_md_hd_t md;
gcry_md_open (&md, DIGEST_ALGO_MD5, 0);
if( pubkey_get_npkey( sk->pubkey_algo ) > 1 ) {
size_t nbytes;
if (gcry_mpi_print( GCRYMPI_FMT_USG, NULL, 0, &nbytes, sk->skey[0]))
BUG ();
/* fixme: allocate it on the stack */
buf = xmalloc(nbytes);
if (gcry_mpi_print (GCRYMPI_FMT_USG, buf, nbytes, NULL,sk->skey[0]))
BUG ();
gcry_md_write (md, buf, nbytes);
xfree (buf);
if (gcry_mpi_print( GCRYMPI_FMT_USG, NULL, 0, &nbytes, sk->skey[1]))
BUG ();
/* fixme: allocate it on the stack */
buf = xmalloc(nbytes);
if (gcry_mpi_print( GCRYMPI_FMT_USG, buf,nbytes, NULL, sk->skey[1]))
BUG ();
gcry_md_write( md, buf, nbytes );
xfree(buf);
}
gcry_md_final (md);
if( !array )
array = xmalloc ( 16 );
len = 16;
memcpy(array, gcry_md_read (md, DIGEST_ALGO_MD5), 16 );
gcry_md_close (md);
}
else {
gcry_md_hd_t md;
md = do_fingerprint_md_sk(sk);
dp = gcry_md_read ( md, 0 );
len = gcry_md_get_algo_dlen (gcry_md_get_algo (md));
assert( len <= MAX_FINGERPRINT_LEN );
if( !array )
array = xmalloc ( len );
memcpy(array, dp, len );
gcry_md_close (md);
}
*ret_len = len;
return array;
}
/* Create a serialno/fpr string from the serial number and the secret
* key. caller must free the returned string. There is no error
* return. */
char *
serialno_and_fpr_from_sk (const unsigned char *sn, size_t snlen,
PKT_secret_key *sk)
{
unsigned char fpr[MAX_FINGERPRINT_LEN];
size_t fprlen;
char *buffer, *p;
int i;
fingerprint_from_sk (sk, fpr, &fprlen);
buffer = p= xmalloc (snlen*2 + 1 + fprlen*2 + 1);
for (i=0; i < snlen; i++, p+=2)
sprintf (p, "%02X", sn[i]);
*p++ = '/';
for (i=0; i < fprlen; i++, p+=2)
sprintf (p, "%02X", fpr[i]);
*p = 0;
return buffer;
}
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