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gnupg/g10/getkey.c
Werner Koch 86f261dbc5 cipher reorganisiert
1998-04-07 18:16:10 +00:00

890 lines
22 KiB
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/* getkey.c - Get a key from the database
* Copyright (C) 1998 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 <ctype.h>
#include "util.h"
#include "packet.h"
#include "memory.h"
#include "iobuf.h"
#include "keydb.h"
#include "options.h"
#define MAX_PKC_CACHE_ENTRIES 500
typedef struct keyid_list {
struct keyid_list *next;
u32 keyid[2];
} *keyid_list_t;
typedef struct user_id_db {
struct user_id_db *next;
u32 keyid[2];
int len;
char name[1];
} *user_id_db_t;
typedef struct pkc_cache_entry {
struct pkc_cache_entry *next;
u32 keyid[2];
PKT_public_cert *pkc;
} *pkc_cache_entry_t;
typedef struct enum_seckey_context {
int eof;
STRLIST sl;
IOBUF iobuf;
} enum_seckey_context_t;
static STRLIST keyrings;
static STRLIST secret_keyrings;
static keyid_list_t unknown_keyids;
static user_id_db_t user_id_db;
static pkc_cache_entry_t pkc_cache;
static int pkc_cache_entries; /* number of entries in pkc cache */
static int lookup( PKT_public_cert *pkc,
int mode, u32 *keyid, const char *name );
static int lookup_skc( PKT_secret_cert *skc,
int mode, u32 *keyid, const char *name );
/* note this function may be called before secure memory is
* available */
void
add_keyring( const char *name )
{
STRLIST sl;
int rc;
if( *name != '/' ) { /* do tilde expansion etc */
char *p ;
if( strchr(name, '/') )
p = make_filename(name, NULL);
else
p = make_filename(opt.homedir, name, NULL);
sl = m_alloc( sizeof *sl + strlen(p) );
strcpy(sl->d, p );
m_free(p);
}
else {
sl = m_alloc( sizeof *sl + strlen(name) );
strcpy(sl->d, name );
}
sl->next = keyrings;
keyrings = sl;
/* fixme: We should remove much out of this module and
* combine it with the keyblock stuff from ringedit.c
* For now we will simple add the filename as keyblock resource
*/
rc = add_keyblock_resource( sl->d, 0, 0 );
if( rc )
log_error("keyblock resource '%s': %s\n", sl->d, g10_errstr(rc) );
}
/****************
* Get the name of the keyrings, start with a sequence number of 0.
*/
const char *
get_keyring( int sequence )
{
STRLIST sl;
for(sl = keyrings; sl && sequence; sl = sl->next, sequence-- )
;
return sl? sl->d : NULL;
}
void
add_secret_keyring( const char *name )
{
STRLIST sl;
int rc;
if( *name != '/' ) { /* do tilde expansion etc */
char *p ;
if( strchr(name, '/') )
p = make_filename(name, NULL);
else
p = make_filename(opt.homedir, name, NULL);
sl = m_alloc( sizeof *sl + strlen(p) );
strcpy(sl->d, p );
m_free(p);
}
else {
sl = m_alloc( sizeof *sl + strlen(name) );
strcpy(sl->d, name );
}
sl->next = secret_keyrings;
secret_keyrings = sl;
/* fixme: We should remove much out of this mpdule and
* combine it with the keyblock stuff from ringedit.c
* For now we will simple add the filename as keyblock resource
*/
rc = add_keyblock_resource( sl->d, 0, 1 );
if( rc )
log_error("secret keyblock resource '%s': %s\n", sl->d, g10_errstr(rc));
}
static void
cache_public_cert( PKT_public_cert *pkc )
{
pkc_cache_entry_t ce;
u32 keyid[2];
if( pkc->pubkey_algo == PUBKEY_ALGO_ELGAMAL
|| pkc->pubkey_algo == PUBKEY_ALGO_DSA
|| pkc->pubkey_algo == PUBKEY_ALGO_RSA ) {
keyid_from_pkc( pkc, keyid );
}
else
return; /* don't know how to get the keyid */
for( ce = pkc_cache; ce; ce = ce->next )
if( ce->keyid[0] == keyid[0] && ce->keyid[1] == keyid[1] ) {
if( DBG_CACHE )
log_debug("cache_public_cert: already in cache\n");
return;
}
if( pkc_cache_entries > MAX_PKC_CACHE_ENTRIES ) {
/* FIMXE: use another algorithm to free some cache slots */
if( pkc_cache_entries == MAX_PKC_CACHE_ENTRIES ) {
pkc_cache_entries++;
log_info("too many entries in pkc cache - disabled\n");
}
ce = pkc_cache;
free_public_cert( ce->pkc );
}
else {
pkc_cache_entries++;
ce = m_alloc( sizeof *ce );
ce->next = pkc_cache;
pkc_cache = ce;
}
ce->pkc = copy_public_cert( NULL, pkc );
ce->keyid[0] = keyid[0];
ce->keyid[1] = keyid[1];
}
/****************
* Store the association of keyid and userid
*/
void
cache_user_id( PKT_user_id *uid, u32 *keyid )
{
user_id_db_t r;
for(r=user_id_db; r; r = r->next )
if( r->keyid[0] == keyid[0] && r->keyid[1] == keyid[1] ) {
if( DBG_CACHE )
log_debug("cache_user_id: already in cache\n");
return;
}
r = m_alloc( sizeof *r + uid->len-1 );
r->keyid[0] = keyid[0];
r->keyid[1] = keyid[1];
r->len = uid->len;
memcpy(r->name, uid->name, r->len);
r->next = user_id_db;
user_id_db = r;
}
/****************
* Get a public key and store it into the allocated pkc
* can be called with PKC set to NULL to just read it into some
* internal structures.
*/
int
get_pubkey( PKT_public_cert *pkc, u32 *keyid )
{
keyid_list_t kl;
int internal = 0;
int rc = 0;
pkc_cache_entry_t ce;
/* lets see wether we checked the keyid already */
for( kl = unknown_keyids; kl; kl = kl->next )
if( kl->keyid[0] == keyid[0] && kl->keyid[1] == keyid[1] )
return G10ERR_NO_PUBKEY; /* already checked and not found */
/* Try to get it from our cache */
for( ce = pkc_cache; ce; ce = ce->next )
if( ce->keyid[0] == keyid[0] && ce->keyid[1] == keyid[1] ) {
if( pkc )
copy_public_cert( pkc, ce->pkc );
return 0;
}
/* more init stuff */
if( !pkc ) {
pkc = m_alloc_clear( sizeof *pkc );
internal++;
}
/* do a lookup */
rc = lookup( pkc, 11, keyid, NULL );
if( !rc )
goto leave;
/* not found: store it for future reference */
kl = m_alloc( sizeof *kl );
kl->keyid[0] = keyid[0];
kl->keyid[1] = keyid[1];
kl->next = unknown_keyids;
unknown_keyids = kl;
rc = G10ERR_NO_PUBKEY;
leave:
if( !rc )
cache_public_cert( pkc );
if( internal )
m_free(pkc);
return rc;
}
static int
hextobyte( const byte *s )
{
int c;
if( *s >= '0' && *s <= '9' )
c = 16 * (*s - '0');
else if( *s >= 'A' && *s <= 'F' )
c = 16 * (10 + *s - 'A');
else if( *s >= 'a' && *s <= 'f' )
c = 16 * (10 + *s - 'a');
else
return -1;
s++;
if( *s >= '0' && *s <= '9' )
c += *s - '0';
else if( *s >= 'A' && *s <= 'F' )
c += 10 + *s - 'A';
else if( *s >= 'a' && *s <= 'f' )
c += 10 + *s - 'a';
else
return -1;
return c;
}
/****************
* Try to get the pubkey by the userid. This functions looks for the
* first pubkey certificate which has the given name in a user_id.
* if pkc has the pubkey algo set, the function will only return
* a pubkey with that algo.
*
* - If the username starts with 8,9,16 or 17 hex-digits (the first one
* must be in the range 0..9), this is considered a keyid; depending
* on the length a short or complete one.
* - If the username starts with 32,33,40 or 41 hex-digits (the first one
* must be in the range 0..9), this is considered a fingerprint.
* (Not yet implemented)
* - If the username starts with a left angle, we assume it is a complete
* email address and look only at this part.
* - If the username starts with a '.', we assume it is the ending
* part of an email address
* - If the username starts with an '@', we assume it is a part of an
* email address
* - If the userid start with an '=' an exact compare is done; this may
* also follow the keyid in which case both parts are matched.
* - If the userid starts with a '*' a case insensitive substring search is
* done (This is also the default).
*/
int
get_pubkey_byname( PKT_public_cert *pkc, const char *name )
{
int internal = 0;
int rc = 0;
const char *s;
u32 keyid[2] = {0}; /* init to avoid compiler warning */
byte fprint[20];
int mode = 0;
/* check what kind of name it is */
for(s = name; *s && isspace(*s); s++ )
;
if( isdigit( *s ) ) { /* a keyid or a fingerprint */
int i, j;
char buf[9];
if( *s == '0' && s[1] == 'x' && isxdigit(s[2]) )
s += 2; /*kludge to allow 0x034343434 */
for(i=0; isxdigit(s[i]); i++ )
;
if( s[i] && !isspace(s[i]) ) /* not terminated by EOS or blank*/
rc = G10ERR_INV_USER_ID;
else if( i == 8 || (i == 9 && *s == '0') ) { /* short keyid */
if( i==9 )
s++;
keyid[1] = strtoul( s, NULL, 16 );
mode = 10;
}
else if( i == 16 || (i == 17 && *s == '0') ) { /* complete keyid */
if( i==17 )
s++;
mem2str(buf, s, 9 );
keyid[0] = strtoul( buf, NULL, 16 );
keyid[1] = strtoul( s+8, NULL, 16 );
mode = 11;
}
else if( i == 32 || ( i == 33 && *s == '0' ) ) { /* md5 fingerprint */
if( i==33 )
s++;
memset(fprint+16, 4, 0);
for(j=0; !rc && j < 16; j++, s+=2 ) {
int c = hextobyte( s );
if( c == -1 )
rc = G10ERR_INV_USER_ID;
else
fprint[j] = c;
}
mode = 16;
}
else if( i == 40 || ( i == 41 && *s == '0' ) ) { /* sha1/rmd160 fprint*/
if( i==33 )
s++;
for(j=0; !rc && j < 20; j++, s+=2 ) {
int c = hextobyte( s );
if( c == -1 )
rc = G10ERR_INV_USER_ID;
else
fprint[j] = c;
}
mode = 20;
}
else
rc = G10ERR_INV_USER_ID;
}
else if( *s == '=' ) { /* exact search */
mode = 1;
s++;
}
else if( *s == '*' ) { /* substring search */
mode = 2;
s++;
}
else if( *s == '<' ) { /* an email address */
mode = 3;
}
else if( *s == '@' ) { /* a part of an email address */
mode = 4;
s++;
}
else if( *s == '.' ) { /* an email address, compare from end */
mode = 5;
s++;
}
else if( *s == '#' ) { /* use local id */
rc = G10ERR_INV_USER_ID; /* not yet implemented */
}
else if( !*s ) /* empty string */
rc = G10ERR_INV_USER_ID;
else
mode = 2;
if( rc )
goto leave;
if( !pkc ) {
pkc = m_alloc_clear( sizeof *pkc );
internal++;
}
rc = mode < 16? lookup( pkc, mode, keyid, name )
: lookup( pkc, mode, keyid, fprint );
leave:
if( internal )
m_free(pkc);
return rc;
}
/****************
* Get a secret key and store it into skey
*/
int
get_seckey( PKT_secret_cert *skc, u32 *keyid )
{
int rc;
rc = lookup_skc( skc, 11, keyid, NULL );
if( !rc ) {
/* check the secret key (this may prompt for a passprase to
* unlock the secret key
*/
rc = check_secret_key( skc );
}
return rc;
}
/****************
* Check wether the secret key is available
* Returns: 0 := key is available
* G10ERR_NO_SECKEY := not availabe
*/
int
seckey_available( u32 *keyid )
{
PKT_secret_cert *skc;
int rc;
skc = m_alloc_clear( sizeof *skc );
rc = lookup_skc( skc, 11, keyid, NULL );
free_secret_cert( skc );
return rc;
}
/****************
* Get a secret key by name and store it into skc
* If NAME is NULL use the default certificate
*/
int
get_seckey_byname( PKT_secret_cert *skc, const char *name, int unprotect )
{
int rc;
/* fixme: add support for compare_name */
rc = lookup_skc( skc, name? 2:15, NULL, name );
if( !rc && unprotect )
rc = check_secret_key( skc );
return rc;
}
static int
compare_name( const char *uid, size_t uidlen, const char *name, int mode )
{
int i;
if( mode == 1 ) { /* exact match */
for(i=0; name[i] && uidlen; i++, uidlen-- )
if( uid[i] != name[i] )
break;
if( !uidlen && !name[i] )
return 0; /* found */
}
else if( mode == 2 ) { /* case insensitive substring */
if( memistr( uid, uidlen, name ) )
return 0;
}
else if( mode == 3 ) { /* case insensitive email address */
/* FIXME: not yet implemented */
if( memistr( uid, uidlen, name ) )
return 0;
}
else if( mode == 4 ) { /* email substring */
/* FIXME: not yet implemented */
if( memistr( uid, uidlen, name ) )
return 0;
}
else if( mode == 5 ) { /* email from end */
/* FIXME: not yet implemented */
if( memistr( uid, uidlen, name ) )
return 0;
}
else
BUG();
return -1; /* not found */
}
/****************
* Lookup a key by scanning all keyrings
* mode 1 = lookup by NAME (exact)
* 2 = lookup by NAME (substring)
* 3 = lookup by NAME (email address)
* 4 = email address (substring)
* 5 = email address (compare from end)
* 10 = lookup by short KEYID (don't care about keyid[0])
* 11 = lookup by long KEYID
* 15 = Get the first key.
* 16 = lookup by 16 byte fingerprint which is stored in NAME
* 20 = lookup by 20 byte fingerprint which is stored in NAME
* Caller must provide an empty PKC, if the pubkey_algo is filled in, only
* a key of this algo will be returned.
*/
static int
lookup( PKT_public_cert *pkc, int mode, u32 *keyid, const char *name )
{
int rc;
KBNODE keyblock = NULL;
KBPOS kbpos;
int oldmode = set_packet_list_mode(0);
rc = enum_keyblocks( 0, &kbpos, &keyblock );
if( rc ) {
if( rc == -1 )
rc = G10ERR_NO_PUBKEY;
else if( rc )
log_error("enum_keyblocks(open) failed: %s\n", g10_errstr(rc) );
goto leave;
}
while( !(rc = enum_keyblocks( 1, &kbpos, &keyblock )) ) {
KBNODE k, kk;
if( mode < 10 ) { /* name lookup */
for(k=keyblock; k; k = k->next ) {
if( k->pkt->pkttype == PKT_USER_ID
&& !compare_name( k->pkt->pkt.user_id->name,
k->pkt->pkt.user_id->len, name, mode)) {
/* we found a matching name, look for the key */
for(kk=keyblock; kk; kk = kk->next )
if( ( kk->pkt->pkttype == PKT_PUBLIC_CERT
|| kk->pkt->pkttype == PKT_PUBKEY_SUBCERT )
&& ( !pkc->pubkey_algo
|| pkc->pubkey_algo
== kk->pkt->pkt.public_cert->pubkey_algo))
break;
if( kk ) {
u32 aki[2];
keyid_from_pkc( kk->pkt->pkt.public_cert, aki );
cache_user_id( k->pkt->pkt.user_id, aki );
k = kk;
break;
}
else
log_error("No key for userid\n");
}
}
}
else { /* keyid or fingerprint lookup */
for(k=keyblock; k; k = k->next ) {
if( k->pkt->pkttype == PKT_PUBLIC_CERT
|| k->pkt->pkttype == PKT_PUBKEY_SUBCERT ) {
if( mode == 10 || mode == 11 ) {
u32 aki[2];
keyid_from_pkc( k->pkt->pkt.public_cert, aki );
if( aki[1] == keyid[1]
&& ( mode == 10 || aki[0] == keyid[0] )
&& ( !pkc->pubkey_algo
|| pkc->pubkey_algo
== k->pkt->pkt.public_cert->pubkey_algo) ){
/* cache the userid */
for(kk=keyblock; kk; kk = kk->next )
if( kk->pkt->pkttype == PKT_USER_ID )
break;
if( kk )
cache_user_id( kk->pkt->pkt.user_id, aki );
else
log_error("No userid for key\n");
break; /* found */
}
}
else if( mode == 15 ) { /* get the first key */
if( !pkc->pubkey_algo
|| pkc->pubkey_algo
== k->pkt->pkt.public_cert->pubkey_algo )
break;
}
else if( mode == 16 || mode == 20 ) {
size_t an;
byte *afp = fingerprint_from_pkc(
k->pkt->pkt.public_cert, &an );
if( an == mode && !memcmp( afp, name, an)
&& ( !pkc->pubkey_algo
|| pkc->pubkey_algo
== k->pkt->pkt.public_cert->pubkey_algo) ) {
m_free(afp);
break;
}
m_free(afp);
}
else
BUG();
} /* end compare public keys */
}
}
if( k ) { /* found */
assert( k->pkt->pkttype == PKT_PUBLIC_CERT
|| k->pkt->pkttype == PKT_PUBKEY_SUBCERT );
copy_public_cert( pkc, k->pkt->pkt.public_cert );
break; /* enumeration */
}
release_kbnode( keyblock );
keyblock = NULL;
}
if( rc == -1 )
rc = G10ERR_NO_PUBKEY;
else if( rc )
log_error("enum_keyblocks(read) failed: %s\n", g10_errstr(rc));
leave:
enum_keyblocks( 2, &kbpos, &keyblock ); /* close */
release_kbnode( keyblock );
set_packet_list_mode(oldmode);
return rc;
}
/****************
* Ditto for secret keys
*/
static int
lookup_skc( PKT_secret_cert *skc, int mode, u32 *keyid, const char *name )
{
int rc;
KBNODE keyblock = NULL;
KBPOS kbpos;
int oldmode = set_packet_list_mode(0);
rc = enum_keyblocks( 5 /* open secret */, &kbpos, &keyblock );
if( rc ) {
if( rc == -1 )
rc = G10ERR_NO_SECKEY;
else if( rc )
log_error("enum_keyblocks(open secret) failed: %s\n", g10_errstr(rc) );
goto leave;
}
while( !(rc = enum_keyblocks( 1, &kbpos, &keyblock )) ) {
KBNODE k, kk;
if( mode < 10 ) { /* name lookup */
for(k=keyblock; k; k = k->next ) {
if( k->pkt->pkttype == PKT_USER_ID
&& !compare_name( k->pkt->pkt.user_id->name,
k->pkt->pkt.user_id->len, name, mode)) {
/* we found a matching name, look for the key */
for(kk=keyblock; kk; kk = kk->next )
if( ( kk->pkt->pkttype == PKT_SECRET_CERT
|| kk->pkt->pkttype == PKT_SECKEY_SUBCERT )
&& ( !skc->pubkey_algo
|| skc->pubkey_algo
== kk->pkt->pkt.secret_cert->pubkey_algo))
break;
if( kk ) {
u32 aki[2];
keyid_from_skc( kk->pkt->pkt.secret_cert, aki );
cache_user_id( k->pkt->pkt.user_id, aki );
k = kk;
break;
}
else
log_error("No key for userid (in skc)\n");
}
}
}
else { /* keyid or fingerprint lookup */
for(k=keyblock; k; k = k->next ) {
if( k->pkt->pkttype == PKT_SECRET_CERT
|| k->pkt->pkttype == PKT_SECKEY_SUBCERT ) {
if( mode == 10 || mode == 11 ) {
u32 aki[2];
keyid_from_skc( k->pkt->pkt.secret_cert, aki );
if( aki[1] == keyid[1]
&& ( mode == 10 || aki[0] == keyid[0] )
&& ( !skc->pubkey_algo
|| skc->pubkey_algo
== k->pkt->pkt.secret_cert->pubkey_algo) ){
/* cache the userid */
for(kk=keyblock; kk; kk = kk->next )
if( kk->pkt->pkttype == PKT_USER_ID )
break;
if( kk )
cache_user_id( kk->pkt->pkt.user_id, aki );
else
log_error("No userid for key\n");
break; /* found */
}
}
else if( mode == 15 ) { /* get the first key */
if( !skc->pubkey_algo
|| skc->pubkey_algo
== k->pkt->pkt.secret_cert->pubkey_algo )
break;
}
else if( mode == 16 || mode == 20 ) {
size_t an;
byte *afp = fingerprint_from_skc(
k->pkt->pkt.secret_cert, &an );
if( an == mode && !memcmp( afp, name, an)
&& ( !skc->pubkey_algo
|| skc->pubkey_algo
== k->pkt->pkt.secret_cert->pubkey_algo) ) {
m_free(afp);
break;
}
m_free(afp);
}
else
BUG();
} /* end compare secret keys */
}
}
if( k ) { /* found */
assert( k->pkt->pkttype == PKT_SECRET_CERT
|| k->pkt->pkttype == PKT_SECKEY_SUBCERT );
copy_secret_cert( skc, k->pkt->pkt.secret_cert );
break; /* enumeration */
}
release_kbnode( keyblock );
keyblock = NULL;
}
if( rc == -1 )
rc = G10ERR_NO_SECKEY;
else if( rc )
log_error("enum_keyblocks(read) failed: %s\n", g10_errstr(rc));
leave:
enum_keyblocks( 2, &kbpos, &keyblock ); /* close */
release_kbnode( keyblock );
set_packet_list_mode(oldmode);
return rc;
}
/****************
* Enumerate all secret keys. Caller must use these procedure:
* 1) create a void pointer and initialize it to NULL
* 2) pass this void pointer by reference to this function
* and provide space for the secret key (pass a buffer for skc)
* 3) call this function as long as it does not return -1
* to indicate EOF.
* 4) Always call this function a last time with SKC set to NULL,
* so that can free it's context.
*
* Return
*/
int
enum_secret_keys( void **context, PKT_secret_cert *skc )
{
int rc=0;
PACKET pkt;
int save_mode;
enum_seckey_context_t *c = *context;
if( !c ) { /* make a new context */
c = m_alloc_clear( sizeof *c );
*context = c;
c->sl = secret_keyrings;
}
if( !skc ) { /* free the context */
m_free( c );
*context = NULL;
return 0;
}
if( c->eof )
return -1;
for( ; c->sl; c->sl = c->sl->next ) {
if( !c->iobuf ) {
if( !(c->iobuf = iobuf_open( c->sl->d ) ) ) {
log_error("enum_secret_keys: can't open '%s'\n", c->sl->d );
continue; /* try next file */
}
}
save_mode = set_packet_list_mode(0);
init_packet(&pkt);
while( (rc=parse_packet(c->iobuf, &pkt)) != -1 ) {
if( rc )
; /* e.g. unknown packet */
else if( pkt.pkttype == PKT_SECRET_CERT ) {
copy_secret_cert( skc, pkt.pkt.secret_cert );
set_packet_list_mode(save_mode);
return 0; /* found */
}
free_packet(&pkt);
}
set_packet_list_mode(save_mode);
iobuf_close(c->iobuf); c->iobuf = NULL;
}
c->eof = 1;
return -1;
}
/****************
* Return a string with a printable representation of the user_id.
* this string must be freed by m_free.
*/
char*
get_user_id_string( u32 *keyid )
{
user_id_db_t r;
char *p;
int pass=0;
/* try it two times; second pass reads from keyrings */
do {
for(r=user_id_db; r; r = r->next )
if( r->keyid[0] == keyid[0] && r->keyid[1] == keyid[1] ) {
p = m_alloc( r->len + 10 );
sprintf(p, "%08lX %.*s", (ulong)keyid[1], r->len, r->name );
return p;
}
} while( ++pass < 2 && !get_pubkey( NULL, keyid ) );
p = m_alloc( 15 );
sprintf(p, "%08lX [?]", (ulong)keyid[1] );
return p;
}
char*
get_user_id( u32 *keyid, size_t *rn )
{
user_id_db_t r;
char *p;
int pass=0;
/* try it two times; second pass reads from keyrings */
do {
for(r=user_id_db; r; r = r->next )
if( r->keyid[0] == keyid[0] && r->keyid[1] == keyid[1] ) {
p = m_alloc( r->len );
memcpy(p, r->name, r->len );
*rn = r->len;
return p;
}
} while( ++pass < 2 && !get_pubkey( NULL, keyid ) );
p = m_alloc( 19 );
memcpy(p, "[User id not found]", 19 );
*rn = 19;
return p;
}
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