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* packet.h, build-packet.c (hash_public_key): Remove function ...

Browse Source 
* keydb.h, keyid.c (hash_public_key, do_fingerprint_md): ... and make a
new one here that shares code with the fingerprint calculations.  This
removes some duplicated functionality, and is also around 14% faster.
(Every bit helps).

* import.c (import_one): No longer need the Elgamal import warning.

* getkey.c (get_pubkey_fast): This one is sort of obscure. get_pubkey_fast
returns the primary key when requesting a subkey, so if a user has a key
signed by a subkey (we don't do this, but used to), AND that key is not
self-signed, AND the algorithm of the subkey in question is not present in
GnuPG, AND the algorithm of the primary key that owns the subkey in
question is present in GnuPG, then we will try and verify the subkey
signature using the primary key algorithm and hit a BUG().  The fix is to
not return a hit if the keyid is not the primary.  All other users of
get_pubkey_fast already expect a primary only.
This commit is contained in:
David Shaw 2003-12-11 01:07:42 +00:00
parent 888a6c2980
commit db5ab5e730
7 changed files with 108 additions and 143 deletions
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23
g10/ChangeLog
View File

@ -1,3 +1,26 @@
2003-12-10 David Shaw <dshaw@jabberwocky.com>
* packet.h, build-packet.c (hash_public_key): Remove function ...
* keydb.h, keyid.c (hash_public_key, do_fingerprint_md): ... and
make a new one here that shares code with the fingerprint
calculations. This removes some duplicated functionality, and is
also around 14% faster. (Every bit helps).
* import.c (import_one): No longer need the Elgamal import
warning.
* getkey.c (get_pubkey_fast): This one is sort of obscure.
get_pubkey_fast returns the primary key when requesting a subkey,
so if a user has a key signed by a subkey (we don't do this, but
used to), AND that key is not self-signed, AND the algorithm of
the subkey in question is not present in GnuPG, AND the algorithm
of the primary key that owns the subkey in question is present in
GnuPG, then we will try and verify the subkey signature using the
primary key algorithm and hit a BUG(). The fix is to not return a
hit if the keyid is not the primary. All other users of
get_pubkey_fast already expect a primary only.
2003-12-09 David Shaw <dshaw@jabberwocky.com>
* keyid.c (do_fingerprint_md): Remove the rules to hash the old v3

79
g10/build-packet.c
View File

@ -254,85 +254,6 @@ do_public_key( IOBUF out, int ctb, PKT_public_key *pk )
}
/****************
* Make a hash value from the public key certificate
*/
void
hash_public_key( MD_HANDLE md, PKT_public_key *pk )
{
PACKET pkt;
int rc = 0;
int ctb;
ulong pktlen;
int c;
IOBUF a = iobuf_temp();
#if 0
FILE *fp = fopen("dump.pk", "a");
int i=0;
fprintf(fp, "\nHashing PK (v%d):\n", pk->version);
#endif
/* build the packet */
init_packet(&pkt);
pkt.pkttype = PKT_PUBLIC_KEY;
pkt.pkt.public_key = pk;
if( (rc = build_packet( a, &pkt )) )
log_fatal("build public_key for hashing failed: %s\n", g10_errstr(rc));
if( !(pk->version == 3 && pk->pubkey_algo == 16) ) {
/* skip the constructed header but don't do this for our very old
* v3 ElG keys */
ctb = iobuf_get_noeof(a);
pktlen = 0;
if( (ctb & 0x40) ) {
c = iobuf_get_noeof(a);
if( c < 192 )
pktlen = c;
else if( c < 224 ) {
pktlen = (c - 192) * 256;
c = iobuf_get_noeof(a);
pktlen += c + 192;
}
else if( c == 255 ) {
pktlen = iobuf_get_noeof(a) << 24;
pktlen |= iobuf_get_noeof(a) << 16;
pktlen |= iobuf_get_noeof(a) << 8;
pktlen |= iobuf_get_noeof(a);
}
}
else {
int lenbytes = ((ctb&3)==3)? 0 : (1<<(ctb & 3));
for( ; lenbytes; lenbytes-- ) {
pktlen <<= 8;
pktlen |= iobuf_get_noeof(a);
}
}
/* hash a header */
md_putc( md, 0x99 );
pktlen &= 0xffff; /* can't handle longer packets */
md_putc( md, pktlen >> 8 );
md_putc( md, pktlen & 0xff );
}
/* hash the packet body */
while( (c=iobuf_get(a)) != -1 ) {
#if 0
fprintf( fp," %02x", c );
if( (++i == 24) ) {
putc('\n', fp);
i=0;
}
#endif
md_putc( md, c );
}
#if 0
putc('\n', fp);
fclose(fp);
#endif
iobuf_cancel(a);
}
static int
do_secret_key( IOBUF out, int ctb, PKT_secret_key *sk )
{

15
g10/getkey.c
View File

@ -374,13 +374,15 @@ get_pubkey( PKT_public_key *pk, u32 *keyid )
/* Get a public key and store it into the allocated pk. This function
differs from get_pubkey() in that it does not do a check of the key
to avoid recursion. It should be used only in very certain cases. */
to avoid recursion. It should be used only in very certain cases.
It will only retrieve primary keys. */
int
get_pubkey_fast (PKT_public_key *pk, u32 *keyid)
{
int rc = 0;
KEYDB_HANDLE hd;
KBNODE keyblock;
u32 pkid[2];
assert (pk);
#if MAX_PK_CACHE_ENTRIES
@ -416,17 +418,22 @@ get_pubkey_fast (PKT_public_key *pk, u32 *keyid)
assert ( keyblock->pkt->pkttype == PKT_PUBLIC_KEY
|| keyblock->pkt->pkttype == PKT_PUBLIC_SUBKEY );
copy_public_key (pk, keyblock->pkt->pkt.public_key );
keyid_from_pk(keyblock->pkt->pkt.public_key,pkid);
if(keyid[0]==pkid[0] && keyid[1]==pkid[1])
copy_public_key (pk, keyblock->pkt->pkt.public_key );
else
rc=G10ERR_NO_PUBKEY;
release_kbnode (keyblock);
/* Not caching key here since it won't have all of the fields
properly set. */
return 0;
return rc;
}
KBNODE
get_pubkeyblock( u32 *keyid )
{

4
g10/import.c
View File

@ -559,10 +559,6 @@ import_one( const char *fname, KBNODE keyblock,
keyid_from_pk( pk, keyid );
uidnode = find_next_kbnode( keyblock, PKT_USER_ID );
if(pk->pubkey_algo==PUBKEY_ALGO_ELGAMAL)
log_info(_("key %08lX: Elgamal primary key -"
" this may take some time to import\n"),(ulong)keyid[1]);
if( opt.verbose && !opt.interactive ) {
log_info( "pub %4u%c/%08lX %s ",
nbits_from_pk( pk ),

5
g10/keydb.h
View File

@ -1,5 +1,5 @@
/* keydb.h - Key database
* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
* Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
@ -237,6 +237,7 @@ KEYDB_HANDLE get_ctx_handle(GETKEY_CTX ctx);
/*-- keyid.c --*/
int pubkey_letter( int algo );
void hash_public_key( MD_HANDLE md, PKT_public_key *pk );
u32 keyid_from_sk( PKT_secret_key *sk, u32 *keyid );
u32 keyid_from_pk( PKT_public_key *pk, u32 *keyid );
u32 keyid_from_sig( PKT_signature *sig, u32 *keyid );
@ -250,13 +251,11 @@ const char *datestr_from_sig( PKT_signature *sig );
const char *expirestr_from_pk( PKT_public_key *pk );
const char *expirestr_from_sk( PKT_secret_key *sk );
const char *expirestr_from_sig( PKT_signature *sig );
const char *colon_strtime (u32 t);
const char *colon_datestr_from_pk (PKT_public_key *pk);
const char *colon_datestr_from_sk (PKT_secret_key *sk);
const char *colon_datestr_from_sig (PKT_signature *sig);
const char *colon_expirestr_from_sig (PKT_signature *sig);
byte *fingerprint_from_sk( PKT_secret_key *sk, byte *buf, size_t *ret_len );
byte *fingerprint_from_pk( PKT_public_key *pk, byte *buf, size_t *ret_len );

118
g10/keyid.c
View File

@ -47,59 +47,80 @@ pubkey_letter( int algo )
}
}
/* This function is useful for v4 fingerprints and v3 or v4 key
signing. */
void
hash_public_key( MD_HANDLE md, PKT_public_key *pk )
{
unsigned n=6;
unsigned nb[PUBKEY_MAX_NPKEY];
unsigned nn[PUBKEY_MAX_NPKEY];
byte *pp[PUBKEY_MAX_NPKEY];
int i;
int npkey = pubkey_get_npkey( pk->pubkey_algo );
/* Two extra bytes for the expiration date in v3 */
if(pk->version<4)
n+=2;
if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
{
pp[0]=mpi_get_opaque(pk->pkey[0],&nn[0]);
n+=nn[0];
}
else
for(i=0; i < npkey; i++ )
{
nb[i] = mpi_get_nbits(pk->pkey[i]);
pp[i] = mpi_get_buffer( pk->pkey[i], nn+i, NULL );
n += 2 + nn[i];
}
md_putc( md, 0x99 ); /* ctb */
/* What does it mean if n is greater than than 0xFFFF ? */
md_putc( md, n >> 8 ); /* 2 byte length header */
md_putc( md, n );
md_putc( md, pk->version );
md_putc( md, pk->timestamp >> 24 );
md_putc( md, pk->timestamp >> 16 );
md_putc( md, pk->timestamp >> 8 );
md_putc( md, pk->timestamp );
if(pk->version<4)
{
u16 days=0;
if(pk->expiredate)
days=(u16)((pk->expiredate - pk->timestamp) / 86400L);
md_putc( md, days >> 8 );
md_putc( md, days );
}
md_putc( md, pk->pubkey_algo );
if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
md_write(md,pp[0],nn[0]);
else
for(i=0; i < npkey; i++ )
{
md_putc( md, nb[i]>>8);
md_putc( md, nb[i] );
md_write( md, pp[i], nn[i] );
m_free(pp[i]);
}
}
static MD_HANDLE
do_fingerprint_md( PKT_public_key *pk )
{
MD_HANDLE md;
unsigned n=6;
unsigned nb[PUBKEY_MAX_NPKEY];
unsigned nn[PUBKEY_MAX_NPKEY];
byte *pp[PUBKEY_MAX_NPKEY];
int i;
int npkey = pubkey_get_npkey( pk->pubkey_algo );
MD_HANDLE md;
md = md_open( DIGEST_ALGO_SHA1, 0);
md = md_open( DIGEST_ALGO_SHA1, 0);
hash_public_key(md,pk);
md_final( md );
if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
{
pp[0]=mpi_get_opaque(pk->pkey[0],&nn[0]);
n+=nn[0];
}
else
for(i=0; i < npkey; i++ )
{
nb[i] = mpi_get_nbits(pk->pkey[i]);
pp[i] = mpi_get_buffer( pk->pkey[i], nn+i, NULL );
n += 2 + nn[i];
}
md_putc( md, 0x99 ); /* ctb */
/* What does it mean if n is greater than than 0xFFFF ? */
md_putc( md, n >> 8 ); /* 2 byte length header */
md_putc( md, n );
md_putc( md, 4 );
md_putc( md, pk->timestamp >> 24 );
md_putc( md, pk->timestamp >> 16 );
md_putc( md, pk->timestamp >> 8 );
md_putc( md, pk->timestamp );
md_putc( md, pk->pubkey_algo );
if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
md_write(md,pp[0],nn[0]);
else
for(i=0; i < npkey; i++ )
{
md_putc( md, nb[i]>>8);
md_putc( md, nb[i] );
md_write( md, pp[i], nn[i] );
m_free(pp[i]);
}
md_final( md );
return md;
return md;
}
static MD_HANDLE
@ -122,7 +143,6 @@ do_fingerprint_md_sk( PKT_secret_key *sk )
return do_fingerprint_md( &pk );
}
/****************
* 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.

5
g10/packet.h
View File

@ -1,6 +1,6 @@
/* packet.h - packet definitions
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
* Free Software Foundation, Inc.
* Copyright (C) 1998, 1999, 2000, 2001, 2002,
* 2003 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
@ -424,7 +424,6 @@ PACKET *create_gpg_control ( ctrlpkttype_t type,
/*-- build-packet.c --*/
int build_packet( IOBUF inp, PACKET *pkt );
u32 calc_packet_length( PACKET *pkt );
void hash_public_key( MD_HANDLE md, PKT_public_key *pk );
void build_sig_subpkt( PKT_signature *sig, sigsubpkttype_t type,
const byte *buffer, size_t buflen );
void build_sig_subpkt_from_sig( PKT_signature *sig );