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gnupg/g10/keygen.c

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/* keygen.c - generate a key pair
* Copyright (C) 1998, 1999 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 <ctype.h>
#include <errno.h>
#include <assert.h>
#include "util.h"
#include "main.h"
#include "packet.h"
#include "cipher.h"
#include "ttyio.h"
#include "options.h"
#include "keydb.h"
#include "status.h"
#include "i18n.h"
static void
write_uid( KBNODE root, const char *s )
{
PACKET *pkt = m_alloc_clear(sizeof *pkt );
size_t n = strlen(s);
pkt->pkttype = PKT_USER_ID;
pkt->pkt.user_id = m_alloc( sizeof *pkt->pkt.user_id + n - 1 );
pkt->pkt.user_id->len = n;
strcpy(pkt->pkt.user_id->name, s);
add_kbnode( root, new_kbnode( pkt ) );
}
int
keygen_add_key_expire( PKT_signature *sig, void *opaque )
{
PKT_public_key *pk = opaque;
byte buf[8];
u32 u;
if( pk->expiredate ) {
u = pk->expiredate > pk->timestamp? pk->expiredate - pk->timestamp
: pk->timestamp;
buf[0] = (u >> 24) & 0xff;
buf[1] = (u >> 16) & 0xff;
buf[2] = (u >> 8) & 0xff;
buf[3] = u & 0xff;
build_sig_subpkt( sig, SIGSUBPKT_KEY_EXPIRE, buf, 4 );
}
return 0;
}
/****************
* Add preference to the self signature packet.
* This is only called for packets with version > 3.
*/
int
keygen_add_std_prefs( PKT_signature *sig, void *opaque )
{
byte buf[8];
keygen_add_key_expire( sig, opaque );
buf[0] = CIPHER_ALGO_TWOFISH;
buf[1] = CIPHER_ALGO_CAST5;
build_sig_subpkt( sig, SIGSUBPKT_PREF_SYM, buf, 2 );
buf[0] = DIGEST_ALGO_RMD160;
buf[1] = DIGEST_ALGO_SHA1;
build_sig_subpkt( sig, SIGSUBPKT_PREF_HASH, buf, 2 );
buf[0] = 2;
buf[1] = 1;
build_sig_subpkt( sig, SIGSUBPKT_PREF_COMPR, buf, 2 );
buf[0] = 0x80; /* no modify - It is reasonable that a key holder
* has the possibility to reject signatures from users
* who are known to sign everything without any
* validation - so a signed key should be send
* to the holder who in turn can put it on a keyserver
*/
build_sig_subpkt( sig, SIGSUBPKT_KS_FLAGS, buf, 1 );
return 0;
}
static int
write_selfsig( KBNODE root, KBNODE pub_root, PKT_secret_key *sk )
{
PACKET *pkt;
PKT_signature *sig;
PKT_user_id *uid;
int rc=0;
KBNODE node;
PKT_public_key *pk;
if( opt.verbose )
log_info(_("writing self signature\n"));
/* get the uid packet from the list */
node = find_kbnode( root, PKT_USER_ID );
if( !node )
BUG(); /* no user id packet in tree */
uid = node->pkt->pkt.user_id;
/* get the pk packet from the pub_tree */
node = find_kbnode( pub_root, PKT_PUBLIC_KEY );
if( !node )
BUG();
pk = node->pkt->pkt.public_key;
/* and make the signature */
rc = make_keysig_packet( &sig, pk, uid, NULL, sk, 0x13, 0,
keygen_add_std_prefs, pk );
if( rc ) {
log_error("make_keysig_packet failed: %s\n", g10_errstr(rc) );
return rc;
}
pkt = m_alloc_clear( sizeof *pkt );
pkt->pkttype = PKT_SIGNATURE;
pkt->pkt.signature = sig;
add_kbnode( root, new_kbnode( pkt ) );
return rc;
}
static int
write_keybinding( KBNODE root, KBNODE pub_root, PKT_secret_key *sk )
{
PACKET *pkt;
PKT_signature *sig;
int rc=0;
KBNODE node;
PKT_public_key *pk, *subpk;
if( opt.verbose )
log_info(_("writing key binding signature\n"));
/* get the pk packet from the pub_tree */
node = find_kbnode( pub_root, PKT_PUBLIC_KEY );
if( !node )
BUG();
pk = node->pkt->pkt.public_key;
/* find the last subkey */
subpk = NULL;
for(node=pub_root; node; node = node->next ) {
if( node->pkt->pkttype == PKT_PUBLIC_SUBKEY )
subpk = node->pkt->pkt.public_key;
}
if( !subpk )
BUG();
/* and make the signature */
rc = make_keysig_packet( &sig, pk, NULL, subpk, sk, 0x18, 0,
keygen_add_key_expire, subpk );
if( rc ) {
log_error("make_keysig_packet failed: %s\n", g10_errstr(rc) );
return rc;
}
pkt = m_alloc_clear( sizeof *pkt );
pkt->pkttype = PKT_SIGNATURE;
pkt->pkt.signature = sig;
add_kbnode( root, new_kbnode( pkt ) );
return rc;
}
static int
gen_elg(int algo, unsigned nbits, KBNODE pub_root, KBNODE sec_root, DEK *dek,
STRING2KEY *s2k, PKT_secret_key **ret_sk, u32 expireval,
int version )
{
int rc;
int i;
PACKET *pkt;
PKT_secret_key *sk;
PKT_public_key *pk;
MPI skey[4];
MPI *factors;
assert( is_ELGAMAL(algo) );
rc = pubkey_generate( algo, nbits, skey, &factors );
if( rc ) {
log_error("pubkey_generate failed: %s\n", g10_errstr(rc) );
return rc;
}
sk = m_alloc_clear( sizeof *sk );
pk = m_alloc_clear( sizeof *pk );
sk->timestamp = pk->timestamp = make_timestamp();
sk->version = pk->version = version;
if( expireval ) {
sk->expiredate = pk->expiredate = sk->timestamp + expireval;
}
sk->pubkey_algo = pk->pubkey_algo = algo;
pk->pkey[0] = mpi_copy( skey[0] );
pk->pkey[1] = mpi_copy( skey[1] );
pk->pkey[2] = mpi_copy( skey[2] );
sk->skey[0] = skey[0];
sk->skey[1] = skey[1];
sk->skey[2] = skey[2];
sk->skey[3] = skey[3];
sk->is_protected = 0;
sk->protect.algo = 0;
sk->csum = checksum_mpi_counted_nbits( sk->skey[3] );
if( ret_sk ) /* not a subkey: return an unprotected version of the sk */
*ret_sk = copy_secret_key( NULL, sk );
if( dek ) {
sk->protect.algo = dek->algo;
sk->protect.s2k = *s2k;
rc = protect_secret_key( sk, dek );
if( rc ) {
log_error("protect_secret_key failed: %s\n", g10_errstr(rc) );
free_public_key(pk);
free_secret_key(sk);
return rc;
}
}
pkt = m_alloc_clear(sizeof *pkt);
pkt->pkttype = ret_sk ? PKT_PUBLIC_KEY : PKT_PUBLIC_SUBKEY;
pkt->pkt.public_key = pk;
add_kbnode(pub_root, new_kbnode( pkt ));
/* don't know whether it makes sense to have the factors, so for now
* we store them in the secret keyring (but they are not secret) */
pkt = m_alloc_clear(sizeof *pkt);
pkt->pkttype = ret_sk ? PKT_SECRET_KEY : PKT_SECRET_SUBKEY;
pkt->pkt.secret_key = sk;
add_kbnode(sec_root, new_kbnode( pkt ));
for(i=0; factors[i]; i++ )
add_kbnode( sec_root,
make_mpi_comment_node("#:ELG_factor:", factors[i] ));
return 0;
}
/****************
* Generate a DSA key
*/
static int
gen_dsa(unsigned nbits, KBNODE pub_root, KBNODE sec_root, DEK *dek,
STRING2KEY *s2k, PKT_secret_key **ret_sk, u32 expireval )
{
int rc;
int i;
PACKET *pkt;
PKT_secret_key *sk;
PKT_public_key *pk;
MPI skey[5];
MPI *factors;
if( nbits > 1024 )
nbits = 1024;
rc = pubkey_generate( PUBKEY_ALGO_DSA, nbits, skey, &factors );
if( rc ) {
log_error("pubkey_generate failed: %s\n", g10_errstr(rc) );
return rc;
}
sk = m_alloc_clear( sizeof *sk );
pk = m_alloc_clear( sizeof *pk );
sk->timestamp = pk->timestamp = make_timestamp();
sk->version = pk->version = 4;
if( expireval ) {
sk->expiredate = pk->expiredate = sk->timestamp + expireval;
}
sk->pubkey_algo = pk->pubkey_algo = PUBKEY_ALGO_DSA;
pk->pkey[0] = mpi_copy( skey[0] );
pk->pkey[1] = mpi_copy( skey[1] );
pk->pkey[2] = mpi_copy( skey[2] );
pk->pkey[3] = mpi_copy( skey[3] );
sk->skey[0] = skey[0];
sk->skey[1] = skey[1];
sk->skey[2] = skey[2];
sk->skey[3] = skey[3];
sk->skey[4] = skey[4];
sk->is_protected = 0;
sk->protect.algo = 0;
sk->csum = checksum_mpi_counted_nbits( sk->skey[4] );
if( ret_sk ) /* not a subkey: return an unprotected version of the sk */
*ret_sk = copy_secret_key( NULL, sk );
if( dek ) {
sk->protect.algo = dek->algo;
sk->protect.s2k = *s2k;
rc = protect_secret_key( sk, dek );
if( rc ) {
log_error("protect_secret_key failed: %s\n", g10_errstr(rc) );
free_public_key(pk);
free_secret_key(sk);
return rc;
}
}
pkt = m_alloc_clear(sizeof *pkt);
pkt->pkttype = ret_sk ? PKT_PUBLIC_KEY : PKT_PUBLIC_SUBKEY;
pkt->pkt.public_key = pk;
add_kbnode(pub_root, new_kbnode( pkt ));
/* don't know whether it makes sense to have the factors, so for now
* we store them in the secret keyring (but they are not secret)
* p = 2 * q * f1 * f2 * ... * fn
* We store only f1 to f_n-1; fn can be calculated because p and q
* are known.
*/
pkt = m_alloc_clear(sizeof *pkt);
pkt->pkttype = ret_sk ? PKT_SECRET_KEY : PKT_SECRET_SUBKEY;
pkt->pkt.secret_key = sk;
add_kbnode(sec_root, new_kbnode( pkt ));
for(i=1; factors[i]; i++ ) /* the first one is q */
add_kbnode( sec_root,
make_mpi_comment_node("#:DSA_factor:", factors[i] ));
return 0;
}
/****************
* check valid days:
* return 0 on error or the multiplier
*/
static int
check_valid_days( const char *s )
{
if( !isdigit(*s) )
return 0;
for( s++; *s; s++)
if( !isdigit(*s) )
break;
if( !*s )
return 1;
if( s[1] )
return 0; /* e.g. "2323wc" */
if( *s == 'd' || *s == 'D' )
return 1;
if( *s == 'w' || *s == 'W' )
return 7;
if( *s == 'm' || *s == 'M' )
return 30;
if( *s == 'y' || *s == 'Y' )
return 365;
return 0;
}
/****************
* Returns: 0 to create both a DSA and a ElGamal key.
*/
static int
ask_algo( int *ret_v4, int addmode )
{
char *answer;
int algo;
tty_printf(_("Please select what kind of key you want:\n"));
if( !addmode )
tty_printf(_(" (%d) DSA and ElGamal (default)\n"), 1 );
tty_printf( _(" (%d) DSA (sign only)\n"), 2 );
if( addmode )
tty_printf( _(" (%d) ElGamal (encrypt only)\n"), 3 );
tty_printf( _(" (%d) ElGamal (sign and encrypt)\n"), 4 );
#if 0
tty_printf( _(" (%d) ElGamal in a v3 packet\n"), 5 );
#endif
*ret_v4 = 1;
for(;;) {
answer = cpr_get("keygen.algo",_("Your selection? "));
cpr_kill_prompt();
algo = *answer? atoi(answer): 1;
m_free(answer);
if( algo == 1 && !addmode ) {
algo = 0; /* create both keys */
break;
}
else if( algo == 4 ) {
if( cpr_get_answer_is_yes("keygen.algo.elg_se",_(
"Do you really want to create a sign and encrypt key? "))) {
algo = PUBKEY_ALGO_ELGAMAL;
break;
}
}
else if( algo == 3 && addmode ) {
algo = PUBKEY_ALGO_ELGAMAL_E;
break;
}
else if( algo == 2 ) {
algo = PUBKEY_ALGO_DSA;
break;
}
#if 0
else if( algo == 5 ) {
algo = PUBKEY_ALGO_ELGAMAL_E;
*ret_v4 = 0;
break;
}
#endif
else
tty_printf(_("Invalid selection.\n"));
}
return algo;
}
static unsigned
ask_keysize( int algo )
{
char *answer;
unsigned nbits;
tty_printf(_("About to generate a new %s keypair.\n"
" minimum keysize is 768 bits\n"
" default keysize is 1024 bits\n"
" highest suggested keysize is 2048 bits\n"),
pubkey_algo_to_string(algo) );
for(;;) {
answer = cpr_get("keygen.size",
_("What keysize do you want? (1024) "));
cpr_kill_prompt();
nbits = *answer? atoi(answer): 1024;
m_free(answer);
if( algo == PUBKEY_ALGO_DSA && (nbits < 512 || nbits > 1024) )
tty_printf(_("DSA only allows keysizes from 512 to 1024\n"));
else if( nbits < 768 )
tty_printf(_("keysize too small; 768 is smallest value allowed.\n"));
else if( nbits > 4096 ) {
/* It is ridiculous and an annoyance to use larger key sizes!
* GnuPG can handle much larger sizes; but it takes an eternity
* to create such a key (but less than the time the Sirius
* Computer Corporation needs to process one of the usual
* complaints) and {de,en}cryption although needs some time.
* So, before you complain about this limitation, I suggest that
* you start a discussion with Marvin about this theme and then
* do whatever you want. */
tty_printf(_("keysize too large; %d is largest value allowed.\n"),
4096);
}
else if( nbits > 2048 && !cpr_enabled() ) {
tty_printf(
_("Keysizes larger than 2048 are not suggested because\n"
"computations take REALLY long!\n"));
if( cpr_get_answer_is_yes("keygen.size.huge.okay",_(
"Are you sure that you want this keysize? ")) ) {
tty_printf(_("Okay, but keep in mind that your monitor "
"and keyboard radiation is also very vulnerable "
"to attacks!\n"));
break;
}
}
else if( nbits > 1536 && !cpr_enabled() ) {
if( cpr_get_answer_is_yes("keygen.size.large.okay",_(
"Do you really need such a large keysize? ")) )
break;
}
else
break;
}
tty_printf(_("Requested keysize is %u bits\n"), nbits );
if( algo == PUBKEY_ALGO_DSA && (nbits % 64) ) {
nbits = ((nbits + 63) / 64) * 64;
tty_printf(_("rounded up to %u bits\n"), nbits );
}
else if( (nbits % 32) ) {
nbits = ((nbits + 31) / 32) * 32;
tty_printf(_("rounded up to %u bits\n"), nbits );
}
return nbits;
}
static u32
ask_expire_interval(void)
{
char *answer;
int valid_days=0;
u32 interval = 0;
tty_printf(_("Please specify how long the key should be valid.\n"
" 0 = key does not expire\n"
" <n> = key expires in n days\n"
" <n>w = key expires in n weeks\n"
" <n>m = key expires in n months\n"
" <n>y = key expires in n years\n"));
/* Note: The elgamal subkey for DSA has no expiration date because
* it must be signed with the DSA key and this one has the expiration
* date */
answer = NULL;
for(;;) {
int mult;
u32 abs_date=0;
u32 curtime=0;;
m_free(answer);
answer = cpr_get("keygen.valid",_("Key is valid for? (0) "));
cpr_kill_prompt();
trim_spaces(answer);
curtime = make_timestamp();
if( !*answer )
valid_days = 0;
else if( (abs_date = scan_isodatestr(answer)) && abs_date > curtime ) {
/* This calculation is not perfectly okay because we
* are later going to simply multiply by 86400 and don't
* correct for leapseconds. A solution would be to change
* the whole implemenation to work with dates and not intervals
* which are required for v3 keys.
*/
valid_days = abs_date/86400-curtime/86400+1;
}
else if( (mult=check_valid_days(answer)) ) {
valid_days = atoi(answer) * mult;
if( valid_days < 0 || valid_days > 32767 )
valid_days = 0;
}
else {
tty_printf(_("invalid value\n"));
continue;
}
if( !valid_days ) {
tty_printf(_("Key does not expire at all\n"));
interval = 0;
}
else {
interval = valid_days * 86400L;
/* print the date when the key expires */
tty_printf(_("Key expires at %s\n"),
asctimestamp(curtime + interval ) );
}
if( cpr_enabled() || cpr_get_answer_is_yes("keygen.valid.okay",
_("Is this correct (y/n)? ")) )
break;
}
m_free(answer);
return interval;
}
u32
ask_expiredate()
{
u32 x = ask_expire_interval();
return x? make_timestamp() + x : 0;
}
static int
has_invalid_email_chars( const char *s )
{
int at_seen=0;
static char valid_chars[] = "01234567890_-."
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
for( ; *s; s++ ) {
if( *s & 0x80 )
return 1;
if( *s == '@' )
at_seen=1;
else if( !at_seen && !( !!strchr( valid_chars, *s ) || *s == '+' ) )
return 1;
else if( at_seen && !strchr( valid_chars, *s ) )
return 1;
}
return 0;
}
static char *
ask_user_id( int mode )
{
char *answer;
char *aname, *acomment, *amail, *uid;
if( !mode )
tty_printf( _("\n"
"You need a User-ID to identify your key; the software constructs the user id\n"
"from Real Name, Comment and Email Address in this form:\n"
" \"Heinrich Heine (Der Dichter) <heinrichh@duesseldorf.de>\"\n\n") );
uid = aname = acomment = amail = NULL;
for(;;) {
char *p;
if( !aname ) {
for(;;) {
m_free(aname);
aname = cpr_get("keygen.name",_("Real name: "));
trim_spaces(aname);
cpr_kill_prompt();
if( strpbrk( aname, "<([])>" ) )
tty_printf(_("Invalid character in name\n"));
else if( isdigit(*aname) )
tty_printf(_("Name may not start with a digit\n"));
else if( strlen(aname) < 5 )
tty_printf(_("Name must be at least 5 characters long\n"));
else
break;
}
}
if( !amail ) {
for(;;) {
m_free(amail);
amail = cpr_get("keygen.email",_("Email address: "));
trim_spaces(amail);
cpr_kill_prompt();
if( !*amail )
break; /* no email address is okay */
else if( has_invalid_email_chars(amail)
|| string_count_chr(amail,'@') != 1
|| *amail == '@'
|| amail[strlen(amail)-1] == '@'
|| amail[strlen(amail)-1] == '.'
|| strstr(amail, "..") )
tty_printf(_("Not a valid email address\n"));
else
break;
}
}
if( !acomment ) {
for(;;) {
m_free(acomment);
acomment = cpr_get("keygen.comment",_("Comment: "));
trim_spaces(acomment);
cpr_kill_prompt();
if( !*acomment )
break; /* no comment is okay */
else if( strpbrk( acomment, "()" ) )
tty_printf(_("Invalid character in comment\n"));
else
break;
}
}
m_free(uid);
uid = p = m_alloc(strlen(aname)+strlen(amail)+strlen(acomment)+12+10);
p = stpcpy(p, aname );
if( *acomment )
p = stpcpy(stpcpy(stpcpy(p," ("), acomment),")");
if( *amail )
p = stpcpy(stpcpy(stpcpy(p," <"), amail),">");
/* append a warning if we do not have dev/random
* or it is switched into quick testmode */
if( quick_random_gen(-1) )
strcpy(p, " (INSECURE!)" );
/* print a note in case that UTF8 mapping has to be done */
for(p=uid; *p; p++ ) {
if( *p & 0x80 ) {
tty_printf(_("You are using the `%s' character set.\n"),
get_native_charset() );
break;
}
}
tty_printf(_("You selected this USER-ID:\n \"%s\"\n\n"), uid);
/* fixme: add a warning if this user-id already exists */
for(;;) {
char *ansstr = _("NnCcEeOoQq");
if( strlen(ansstr) != 10 )
BUG();
if( cpr_enabled() ) {
answer = m_strdup(ansstr+6);
answer[1] = 0;
}
else {
answer = cpr_get("keygen.userid.cmd",_(
"Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? "));
cpr_kill_prompt();
}
if( strlen(answer) > 1 )
;
else if( *answer == ansstr[0] || *answer == ansstr[1] ) {
m_free(aname); aname = NULL;
break;
}
else if( *answer == ansstr[2] || *answer == ansstr[3] ) {
m_free(acomment); acomment = NULL;
break;
}
else if( *answer == ansstr[4] || *answer == ansstr[5] ) {
m_free(amail); amail = NULL;
break;
}
else if( *answer == ansstr[6] || *answer == ansstr[7] ) {
m_free(aname); aname = NULL;
m_free(acomment); acomment = NULL;
m_free(amail); amail = NULL;
break;
}
else if( *answer == ansstr[8] || *answer == ansstr[9] ) {
m_free(aname); aname = NULL;
m_free(acomment); acomment = NULL;
m_free(amail); amail = NULL;
m_free(uid); uid = NULL;
break;
}
m_free(answer);
}
m_free(answer);
if( !amail && !acomment && !amail )
break;
m_free(uid); uid = NULL;
}
if( uid ) {
char *p = native_to_utf8( uid );
m_free( uid );
uid = p;
}
return uid;
}
static DEK *
ask_passphrase( STRING2KEY **ret_s2k )
{
DEK *dek = NULL;
STRING2KEY *s2k;
tty_printf(_("You need a Passphrase to protect your secret key.\n\n") );
s2k = m_alloc_secure( sizeof *s2k );
for(;;) {
s2k->mode = opt.s2k_mode;
s2k->hash_algo = opt.s2k_digest_algo;
dek = passphrase_to_dek( NULL, 0, opt.s2k_cipher_algo, s2k, 2 );
if( !dek ) {
tty_printf(_("passphrase not correctly repeated; try again.\n"));
}
else if( !dek->keylen ) {
m_free(dek); dek = NULL;
m_free(s2k); s2k = NULL;
tty_printf(_(
"You don't want a passphrase - this is probably a *bad* idea!\n"
"I will do it anyway. You can change your passphrase at any time,\n"
"using this program with the option \"--edit-key\".\n\n"));
break;
}
else
break; /* okay */
}
*ret_s2k = s2k;
return dek;
}
static int
do_create( int algo, unsigned nbits, KBNODE pub_root, KBNODE sec_root,
DEK *dek, STRING2KEY *s2k, PKT_secret_key **sk, u32 expiredate,
int v4_packet )
{
int rc=0;
tty_printf(_(
"We need to generate a lot of random bytes. It is a good idea to perform\n"
"some other action (type on the keyboard, move the mouse, utilize the\n"
"disks) during the prime generation; this gives the random number\n"
"generator a better chance to gain enough entropy.\n") );
if( algo == PUBKEY_ALGO_ELGAMAL || algo == PUBKEY_ALGO_ELGAMAL_E )
rc = gen_elg(algo, nbits, pub_root, sec_root, dek, s2k,
sk, expiredate, v4_packet? 4:3 );
else if( algo == PUBKEY_ALGO_DSA )
rc = gen_dsa(nbits, pub_root, sec_root, dek, s2k, sk, expiredate);
else
BUG();
#ifdef ENABLE_COMMENT_PACKETS
if( !rc ) {
add_kbnode( pub_root,
make_comment_node("#created by GNUPG v" VERSION " ("
PRINTABLE_OS_NAME ")"));
add_kbnode( sec_root,
make_comment_node("#created by GNUPG v" VERSION " ("
PRINTABLE_OS_NAME ")"));
}
#endif
return rc;
}
/****************
* Generate a new user id packet, or return NULL if canceled
*/
PKT_user_id *
generate_user_id()
{
PKT_user_id *uid;
char *p;
size_t n;
p = ask_user_id( 1 );
if( !p )
return NULL;
n = strlen(p);
uid = m_alloc( sizeof *uid + n - 1 );
uid->len = n;
strcpy(uid->name, p);
return uid;
}
/****************
* Generate a keypair
*/
void
generate_keypair()
{
unsigned nbits;
char *pub_fname = NULL;
char *sec_fname = NULL;
char *uid = NULL;
KBNODE pub_root = NULL;
KBNODE sec_root = NULL;
PKT_secret_key *sk = NULL;
DEK *dek;
STRING2KEY *s2k;
int rc;
int algo;
u32 expire;
int v4;
int both = 0;
if( opt.batch || opt.answer_yes || opt.answer_no ) {
log_error(_("Key generation can only be used in interactive mode\n"));
return;
}
algo = ask_algo( &v4, 0 );
if( !algo ) {
algo = PUBKEY_ALGO_ELGAMAL_E;
both = 1;
tty_printf(_("DSA keypair will have 1024 bits.\n"));
}
nbits = ask_keysize( algo );
expire = ask_expire_interval();
uid = ask_user_id(0);
if( !uid ) {
log_error(_("Key generation canceled.\n"));
return;
}
dek = ask_passphrase( &s2k );
/* now check whether we are allowed to write to the keyrings */
pub_fname = make_filename(opt.homedir, "pubring.gpg", NULL );
sec_fname = make_filename(opt.homedir, "secring.gpg", NULL );
if( opt.verbose ) {
tty_printf(_("writing public certificate to `%s'\n"), pub_fname );
tty_printf(_("writing secret certificate to `%s'\n"), sec_fname );
}
/* we create the packets as a tree of kbnodes. Because the structure
* we create is known in advance we simply generate a linked list
* The first packet is a dummy comment packet which we flag
* as deleted. The very first packet must always be a KEY packet.
*/
pub_root = make_comment_node("#"); delete_kbnode(pub_root);
sec_root = make_comment_node("#"); delete_kbnode(sec_root);
if( both )
rc = do_create( PUBKEY_ALGO_DSA, 1024, pub_root, sec_root,
dek, s2k, &sk, expire, 1);
else
rc = do_create( algo, nbits, pub_root, sec_root,
dek, s2k, &sk, expire, v4);
if( !rc )
write_uid(pub_root, uid );
if( !rc )
write_uid(sec_root, uid );
if( !rc )
rc = write_selfsig(pub_root, pub_root, sk);
if( !rc )
rc = write_selfsig(sec_root, pub_root, sk);
if( both ) {
rc = do_create( algo, nbits, pub_root, sec_root,
dek, s2k, NULL, expire, 1 );
if( !rc )
rc = write_keybinding(pub_root, pub_root, sk);
if( !rc )
rc = write_keybinding(sec_root, pub_root, sk);
}
if( !rc ) {
KBPOS pub_kbpos;
KBPOS sec_kbpos;
int rc1 = -1;
int rc2 = -1;
/* we can now write the certificates */
if( get_keyblock_handle( pub_fname, 0, &pub_kbpos ) ) {
if( add_keyblock_resource( pub_fname, 1, 0 ) ) {
log_error("can add keyblock file `%s'\n", pub_fname );
rc = G10ERR_CREATE_FILE;
}
else if( get_keyblock_handle( pub_fname, 0, &pub_kbpos ) ) {
log_error("can get keyblock handle for `%s'\n", pub_fname );
rc = G10ERR_CREATE_FILE;
}
}
if( rc )
;
else if( get_keyblock_handle( sec_fname, 1, &sec_kbpos ) ) {
if( add_keyblock_resource( sec_fname, 1, 1 ) ) {
log_error("can add keyblock file `%s'\n", sec_fname );
rc = G10ERR_CREATE_FILE;
}
else if( get_keyblock_handle( sec_fname, 1, &sec_kbpos ) ) {
log_error("can get keyblock handle for `%s'\n", sec_fname );
rc = G10ERR_CREATE_FILE;
}
}
if( rc )
;
else if( (rc=rc1=lock_keyblock( &pub_kbpos )) )
log_error("can't lock public keyring: %s\n", g10_errstr(rc) );
else if( (rc=rc2=lock_keyblock( &sec_kbpos )) )
log_error("can't lock secret keyring: %s\n", g10_errstr(rc) );
else if( (rc=insert_keyblock( &pub_kbpos, pub_root )) )
log_error("can't write public key: %s\n", g10_errstr(rc) );
else if( (rc=insert_keyblock( &sec_kbpos, sec_root )) )
log_error("can't write secret key: %s\n", g10_errstr(rc) );
else {
tty_printf(_("public and secret key created and signed.\n") );
if( algo == PUBKEY_ALGO_DSA )
tty_printf(_("Note that this key cannot be used for "
"encryption. You may want to use\n"
"the command \"--edit-key\" to generate a "
"secondary key for this purpose.\n") );
}
if( !rc1 )
unlock_keyblock( &pub_kbpos );
if( !rc2 )
unlock_keyblock( &sec_kbpos );
}
if( rc )
tty_printf(_("Key generation failed: %s\n"), g10_errstr(rc) );
release_kbnode( pub_root );
release_kbnode( sec_root );
if( sk ) /* the unprotected secret key */
free_secret_key(sk);
m_free(uid);
m_free(dek);
m_free(s2k);
m_free(pub_fname);
m_free(sec_fname);
}
/****************
* add a new subkey to an existing key.
* Returns true if a new key has been generated and put into the keyblocks.
*/
int
generate_subkeypair( KBNODE pub_keyblock, KBNODE sec_keyblock )
{
int okay=0, rc=0;
KBNODE node;
PKT_secret_key *sk = NULL; /* this is the primary sk */
int v4, algo;
u32 expire;
unsigned nbits;
char *passphrase = NULL;
DEK *dek = NULL;
STRING2KEY *s2k = NULL;
u32 cur_time;
/* break out the primary secret key */
node = find_kbnode( sec_keyblock, PKT_SECRET_KEY );
if( !node ) {
log_error("Oops; secret key not found anymore!\n");
goto leave;
}
/* make a copy of the sk to keep the protected one in the keyblock */
sk = copy_secret_key( NULL, node->pkt->pkt.secret_key );
cur_time = make_timestamp();
if( sk->timestamp > cur_time ) {
ulong d = sk->timestamp - cur_time;
log_info( d==1 ? _("key has been created %lu second "
"in future (time warp or clock problem)\n")
: _("key has been created %lu seconds "
"in future (time warp or clock problem)\n"), d );
rc = G10ERR_TIME_CONFLICT;
goto leave;
}
/* unprotect to get the passphrase */
switch( is_secret_key_protected( sk ) ) {
case -1:
rc = G10ERR_PUBKEY_ALGO;
break;
case 0:
tty_printf("This key is not protected.\n");
break;
default:
tty_printf("Key is protected.\n");
rc = check_secret_key( sk, 0 );
if( !rc )
passphrase = get_last_passphrase();
break;
}
if( rc )
goto leave;
algo = ask_algo( &v4, 1 );
assert(algo);
nbits = ask_keysize( algo );
expire = ask_expire_interval();
if( !cpr_enabled() && !cpr_get_answer_is_yes("keygen.sub.okay",
_("Really create? ") ) )
goto leave;
if( passphrase ) {
s2k = m_alloc_secure( sizeof *s2k );
s2k->mode = opt.s2k_mode;
s2k->hash_algo = opt.s2k_digest_algo;
set_next_passphrase( passphrase );
dek = passphrase_to_dek( NULL, 0, opt.s2k_cipher_algo, s2k, 2 );
}
rc = do_create( algo, nbits, pub_keyblock, sec_keyblock,
dek, s2k, NULL, expire, v4 );
if( !rc )
rc = write_keybinding(pub_keyblock, pub_keyblock, sk);
if( !rc )
rc = write_keybinding(sec_keyblock, pub_keyblock, sk);
if( !rc )
okay = 1;
leave:
if( rc )
log_error(_("Key generation failed: %s\n"), g10_errstr(rc) );
m_free( passphrase );
m_free( dek );
m_free( s2k );
if( sk ) /* release the copy of the (now unprotected) secret key */
free_secret_key(sk);
set_next_passphrase( NULL );
return okay;
}
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