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/* keyid.c - jeyid and fingerprint handling
* Copyright (C) 1998, 1999, 2000 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 <gcrypt.h>
#include "util.h"
#include "main.h"
#include "packet.h"
#include "options.h"
#include "keydb.h"
#include "i18n.h"
int
pubkey_letter( int algo )
{
switch( algo ) {
case GCRY_PK_RSA: return 'R' ;
case GCRY_PK_RSA_E: return 'r' ;
case GCRY_PK_RSA_S: return 's' ;
case GCRY_PK_ELG_E: return 'g';
case GCRY_PK_ELG: return 'G' ;
case GCRY_PK_DSA: return 'D' ;
default: return '?';
}
}
static GCRY_MD_HD
do_fingerprint_md( PKT_public_key *pk )
{
GCRY_MD_HD md;
unsigned int n;
unsigned int nn[GNUPG_MAX_NPKEY];
byte *pp[GNUPG_MAX_NPKEY];
int i;
int npkey = pubkey_get_npkey( pk->pubkey_algo );
md = gcry_md_open( pk->version < 4 ? GCRY_MD_RMD160 : GCRY_MD_SHA1, 0);
if( !md )
BUG();
n = pk->version < 4 ? 8 : 6;
for(i=0; i < npkey; i++ ) {
int rc;
size_t nbytes;
rc = gcry_mpi_print( GCRYMPI_FMT_PGP, NULL, &nbytes, pk->pkey[i] );
assert( !rc );
/* fixme: we should try to allocate a buffer on the stack */
pp[i] = gcry_xmalloc(nbytes);
rc = gcry_mpi_print( GCRYMPI_FMT_PGP, pp[i], &nbytes, pk->pkey[i] );
assert( !rc );
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] );
gcry_free(pp[i]);
}
gcry_md_final( md );
return md;
}
static GCRY_MD_HD
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 );
}
static void
v3_keyid( MPI a, u32 *ki )
{
int rc;
byte *buffer;
size_t nbytes;
rc = gcry_mpi_print( GCRYMPI_FMT_USG, NULL, &nbytes, a );
assert( !rc );
/* fixme: allocate it on the stack */
buffer = gcry_xmalloc(nbytes);
rc = gcry_mpi_print( GCRYMPI_FMT_USG, buffer, &nbytes, a );
assert( !rc );
if( nbytes < 8 ) { /* oops */
ki[0] = ki[1] = 0;
}
else {
memcpy( ki+0, buffer+nbytes-8, 4);
memcpy( ki+1, buffer+nbytes-4, 4);
}
gcry_free( buffer );
}
/****************
* 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 dummy_keyid[2];
if( !keyid )
keyid = dummy_keyid;
if( sk->keyid[0] || sk->keyid[1] ) {
keyid[0] = sk->keyid[0];
keyid[1] = sk->keyid[1];
}
else if( sk->version < 4 && is_RSA(sk->pubkey_algo) ) {
if( pubkey_get_npkey(sk->pubkey_algo) )
v3_keyid( sk->skey[0], keyid ); /* take n */
else
keyid[0] = keyid[1] = 0;
sk->keyid[0] = keyid[0];
sk->keyid[1] = keyid[1];
}
else {
const byte *dp;
GCRY_MD_HD 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] ;
gcry_md_close(md);
sk->keyid[0] = keyid[0];
sk->keyid[1] = keyid[1];
}
return keyid[1];
}
/****************
* 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 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];
}
else if( pk->version < 4 && is_RSA(pk->pubkey_algo) ) {
if( pubkey_get_npkey(pk->pubkey_algo) )
v3_keyid( pk->pkey[0], keyid ); /* from n */
else
keyid[0] = keyid[1] = 0;
pk->keyid[0] = keyid[0];
pk->keyid[1] = keyid[1];
}
else {
const byte *dp;
GCRY_MD_HD 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] ;
gcry_md_close(md);
pk->keyid[0] = keyid[0];
pk->keyid[1] = keyid[1];
}
return keyid[1];
}
/****************
* 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];
}
/****************
* 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 );
}
/****************
* 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];
struct tm *tp;
time_t atime = pk->timestamp;
tp = gmtime( &atime );
sprintf(buffer,"%04d-%02d-%02d", 1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
return buffer;
}
const char *
datestr_from_sk( PKT_secret_key *sk )
{
static char buffer[11+5];
struct tm *tp;
time_t atime = sk->timestamp;
tp = gmtime( &atime );
sprintf(buffer,"%04d-%02d-%02d", 1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
return buffer;
}
const char *
datestr_from_sig( PKT_signature *sig )
{
static char buffer[11+5];
struct tm *tp;
time_t atime = sig->timestamp;
tp = gmtime( &atime );
sprintf(buffer,"%04d-%02d-%02d", 1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
return buffer;
}
const char *
expirestr_from_pk( PKT_public_key *pk )
{
static char buffer[11+5];
struct tm *tp;
time_t atime;
if( !pk->expiredate )
return _("never ");
atime = pk->expiredate;
tp = gmtime( &atime );
sprintf(buffer,"%04d-%02d-%02d", 1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
return buffer;
}
const char *
expirestr_from_sk( PKT_secret_key *sk )
{
static char buffer[11+5];
struct tm *tp;
time_t atime;
if( !sk->expiredate )
return _("never ");
atime = sk->expiredate;
tp = gmtime( &atime );
sprintf(buffer,"%04d-%02d-%02d", 1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
return buffer;
}
/**************** .
* 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 char *dp;
size_t len;
if( pk->version < 4 && is_RSA(pk->pubkey_algo) ) {
/* RSA in version 3 packets is special */
GCRY_MD_HD md;
md = gcry_md_open( GCRY_MD_MD5, 0);
if( !md )
BUG();
if( pubkey_get_npkey( pk->pubkey_algo ) > 1 ) {
int rc;
size_t nbytes;
rc = gcry_mpi_print( GCRYMPI_FMT_USG, NULL, &nbytes, pk->pkey[0] );
assert( !rc );
/* fixme: allocate it on the stack */
buf = gcry_xmalloc(nbytes);
rc = gcry_mpi_print( GCRYMPI_FMT_USG, buf, &nbytes, pk->pkey[0] );
assert( !rc );
gcry_md_write( md, buf, nbytes );
gcry_free(buf);
rc = gcry_mpi_print( GCRYMPI_FMT_USG, NULL, &nbytes, pk->pkey[1] );
assert( !rc );
/* fixme: allocate it on the stack */
buf = gcry_xmalloc(nbytes);
rc = gcry_mpi_print( GCRYMPI_FMT_USG, buf, &nbytes, pk->pkey[1] );
assert( !rc );
gcry_md_write( md, buf, nbytes );
gcry_free(buf);
}
gcry_md_final(md);
if( !array )
array = gcry_xmalloc( 16 );
len = 16;
memcpy(array, gcry_md_read(md, GCRY_MD_MD5), 16 );
gcry_md_close(md);
}
else {
GCRY_MD_HD 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 = gcry_xmalloc( len );
memcpy(array, dp, len );
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 md;
md = gcry_md_open( GCRY_MD_MD5, 0);
if( !md )
BUG();
if( pubkey_get_npkey( sk->pubkey_algo ) > 1 ) {
int rc;
size_t nbytes;
/* FIXME: Why is the hash sequence for secret keys different */
rc = gcry_mpi_print( GCRYMPI_FMT_USG, NULL, &nbytes, sk->skey[1] );
assert( !rc );
/* fixme: allocate it on the stack */
buf = gcry_xmalloc(nbytes);
rc = gcry_mpi_print( GCRYMPI_FMT_USG, buf, &nbytes, sk->skey[1] );
assert( !rc );
gcry_md_write( md, buf, nbytes );
gcry_free(buf);
rc = gcry_mpi_print( GCRYMPI_FMT_USG, NULL, &nbytes, sk->skey[0] );
assert( !rc );
/* fixme: allocate it on the stack */
buf = gcry_xmalloc(nbytes);
rc = gcry_mpi_print( GCRYMPI_FMT_USG, buf, &nbytes, sk->skey[0] );
assert( !rc );
gcry_md_write( md, buf, nbytes );
gcry_free(buf);
}
gcry_md_final(md);
if( !array )
array = gcry_xmalloc( 16 );
len = 16;
memcpy(array, gcry_md_read(md, GCRY_MD_MD5), 16 );
gcry_md_close(md);
}
else {
GCRY_MD_HD 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 = gcry_xmalloc( len );
memcpy(array, dp, len );
gcry_md_close(md);
}
*ret_len = len;
return array;
}

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