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gnupg/g10/keygen.c

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/* keygen.c - generate a key pair
* 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 <ctype.h>
#include <errno.h>
#include <assert.h>
#include "util.h"
#include <gcrypt.h>
#include "main.h"
#include "packet.h"
#include "ttyio.h"
#include "options.h"
#include "keydb.h"
#include "status.h"
#include "i18n.h"
enum para_name {
pKEYTYPE,
pKEYLENGTH,
pSUBKEYTYPE,
pSUBKEYLENGTH,
pNAMEREAL,
pNAMEEMAIL,
pNAMECOMMENT,
pUSERID,
pEXPIREDATE,
pKEYEXPIRE, /* in n seconds */
pSUBKEYEXPIRE, /* in n seconds */
pPASSPHRASE,
pPASSPHRASE_DEK,
pPASSPHRASE_S2K
};
struct para_data_s {
struct para_data_s *next;
int lnr;
enum para_name key;
union {
DEK *dek;
STRING2KEY *s2k;
u32 expire;
char value[1];
} u;
};
struct output_control_s {
int lnr;
int dryrun;
int use_files;
struct {
char *fname;
char *newfname;
IOBUF stream;
armor_filter_context_t afx;
} pub;
struct {
char *fname;
char *newfname;
IOBUF stream;
armor_filter_context_t afx;
} sec;
};
static void do_generate_keypair( struct para_data_s *para,
struct output_control_s *outctrl );
static int write_keyblock( IOBUF out, KBNODE node );
static void
write_uid( KBNODE root, const char *s )
{
PACKET *pkt = gcry_xcalloc( 1,sizeof *pkt );
size_t n = strlen(s);
pkt->pkttype = PKT_USER_ID;
pkt->pkt.user_id = gcry_xcalloc( 1, 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] = GCRY_CIPHER_TWOFISH;
buf[1] = GCRY_CIPHER_CAST5;
buf[2] = GCRY_CIPHER_BLOWFISH;
build_sig_subpkt( sig, SIGSUBPKT_PREF_SYM, buf, 3 );
buf[0] = GCRY_MD_RMD160;
buf[1] = GCRY_MD_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", gpg_errstr(rc) );
return rc;
}
pkt = gcry_xcalloc( 1, 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", gpg_errstr(rc) );
return rc;
}
pkt = gcry_xcalloc( 1, sizeof *pkt );
pkt->pkttype = PKT_SIGNATURE;
pkt->pkt.signature = sig;
add_kbnode( root, new_kbnode( pkt ) );
return rc;
}
static int
key_from_sexp( GCRY_MPI *array,
GCRY_SEXP sexp, const char *topname, const char *elems )
{
GCRY_SEXP list, l2;
const char *s;
int i, idx;
list = gcry_sexp_find_token( sexp, topname, 0 );
if( !list )
return GCRYERR_INV_OBJ;
l2 = gcry_sexp_cadr( list );
gcry_sexp_release ( list );
list = l2;
if( !list )
return GCRYERR_NO_OBJ;
idx = 0;
for(s=elems; *s; s++, idx++ ) {
l2 = gcry_sexp_find_token( list, s, 1 );
if( !l2 ) {
for(i=0; i<idx; i++) {
gcry_free( array[i] );
array[i] = NULL;
}
gcry_sexp_release ( list );
return GCRYERR_NO_OBJ; /* required parameter not found */
}
array[idx] = gcry_sexp_nth_mpi( l2, 1, GCRYMPI_FMT_USG );
gcry_sexp_release ( l2 );
if( !array[idx] ) {
for(i=0; i<idx; i++) {
gcry_free( array[i] );
array[i] = NULL;
}
gcry_sexp_release ( list );
return GCRYERR_INV_OBJ; /* required parameter is invalid */
}
}
gcry_sexp_release ( list );
return 0;
}
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 rc;
int i;
PACKET *pkt;
PKT_secret_key *sk;
PKT_public_key *pk;
GCRY_SEXP misc_key_info;
GCRY_SEXP s_parms, s_key;
assert( is_ELGAMAL(algo) );
if( nbits < 512 ) {
nbits = 1024;
log_info(_("keysize invalid; using %u bits\n"), nbits );
}
if( (nbits % 32) ) {
nbits = ((nbits + 31) / 32) * 32;
log_info(_("keysize rounded up to %u bits\n"), nbits );
}
if ( gcry_sexp_build ( &s_parms, NULL,
"(genkey(%s(nbits %d)))",
algo == GCRY_PK_ELG_E ? "openpgp-elg" :
algo == GCRY_PK_ELG ? "elg" : "x-oops" ,
(int)nbits ) )
BUG ();
rc = gcry_pk_genkey( &s_key, s_parms );
gcry_sexp_release( s_parms );
if( rc ) {
log_error("pk_genkey failed: %s\n", gpg_errstr(rc) );
return rc;
}
sk = gcry_xcalloc( 1, sizeof *sk );
pk = gcry_xcalloc( 1, 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 = algo;
rc = key_from_sexp( pk->pkey, s_key, "public-key", "pgy" );
if( rc ) {
log_error("key_from_sexp failed: rc=%d\n", rc );
return rc;
}
rc = key_from_sexp( sk->skey, s_key, "private-key", "pgyx" );
if( rc ) {
log_error("key_from_sexp failed: rc=%d\n", rc );
return rc;
}
misc_key_info = gcry_sexp_find_token( s_key, "misc-key-info", 0 );
gcry_sexp_release ( s_key );
sk->is_protected = 0;
sk->protect.algo = 0;
sk->csum = checksum_mpi( 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", gpg_errstr(rc) );
free_public_key(pk);
free_secret_key(sk);
return rc;
}
}
pkt = gcry_xcalloc( 1,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 = gcry_xcalloc( 1,sizeof *pkt);
pkt->pkttype = ret_sk ? PKT_SECRET_KEY : PKT_SECRET_SUBKEY;
pkt->pkt.secret_key = sk;
add_kbnode(sec_root, new_kbnode( pkt ));
if ( misc_key_info ) {
size_t n;
char *buf;
n = gcry_sexp_sprint ( misc_key_info, 0, NULL, 0 );
buf = gcry_xmalloc ( n+4 );
strcpy ( buf, "#::" );
n = gcry_sexp_sprint ( misc_key_info, 0, buf+3, n );
if ( n ) {
n += 3;
add_kbnode( sec_root, make_comment_node_from_buffer( buf, n ));
}
gcry_free ( buf );
gcry_sexp_release (misc_key_info);
}
return 0;
}
/****************
* Generate a DSA key
*/
static int
gen_dsa(unsigned int 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;
GCRY_SEXP misc_key_info;
GCRY_SEXP s_parms, s_key;
if( nbits > 1024 || nbits < 512 ) {
nbits = 1024;
log_info(_("keysize invalid; using %u bits\n"), nbits );
}
if( (nbits % 64) ) {
nbits = ((nbits + 63) / 64) * 64;
log_info(_("keysize rounded up to %u bits\n"), nbits );
}
if ( gcry_sexp_build ( &s_parms, NULL,
"(genkey(dsa(nbits %d)))", (int)nbits ) )
BUG ();
rc = gcry_pk_genkey( &s_key, s_parms );
gcry_sexp_release( s_parms );
if( rc ) {
log_error("pk_genkey failed: %s\n", gpg_errstr(rc) );
return rc;
}
sk = gcry_xcalloc( 1, sizeof *sk );
pk = gcry_xcalloc( 1, 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 = GCRY_PK_DSA;
rc = key_from_sexp( pk->pkey, s_key, "public-key", "pqgy" );
if( rc ) {
log_error("key_from_sexp failed: rc=%d\n", rc );
return rc;
}
rc = key_from_sexp( sk->skey, s_key, "private-key", "pqgyx" );
if( rc ) {
log_error("key_from_sexp failed: rc=%d\n", rc );
return rc;
}
misc_key_info = gcry_sexp_find_token( s_key, "misc-key-info", 0 );
gcry_sexp_release ( s_key );
sk->is_protected = 0;
sk->protect.algo = 0;
sk->csum = checksum_mpi( 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", gpg_errstr(rc) );
free_public_key(pk);
free_secret_key(sk);
gcry_sexp_release (misc_key_info);
return rc;
}
}
pkt = gcry_xcalloc( 1,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 = gcry_xcalloc( 1,sizeof *pkt);
pkt->pkttype = ret_sk ? PKT_SECRET_KEY : PKT_SECRET_SUBKEY;
pkt->pkt.secret_key = sk;
add_kbnode(sec_root, new_kbnode( pkt ));
if ( misc_key_info ) {
size_t n;
char *buf;
n = gcry_sexp_sprint ( misc_key_info, 0, NULL, 0 );
buf = gcry_xmalloc ( n+4 );
strcpy ( buf, "#::" );
n = gcry_sexp_sprint ( misc_key_info, 0, buf+3, n );
if ( n ) {
n += 3;
add_kbnode( sec_root, make_comment_node_from_buffer( buf, n ));
}
gcry_free ( buf );
gcry_sexp_release (misc_key_info);
}
/* fixme: Merge this with the elg-generate function and release
* some more stuff (memory-leak) */
return 0;
}
#if 0
static int
gen_rsa(int algo, unsigned nbits, KBNODE pub_root, KBNODE sec_root, DEK *dek,
STRING2KEY *s2k, PKT_secret_key **ret_sk, u32 expireval )
{
int rc;
PACKET *pkt;
PKT_secret_key *sk;
PKT_public_key *pk;
MPI skey[4];
MPI *factors;
assert( is_RSA(algo) );
if( nbits < 1024 ) {
nbits = 1024;
log_info(_("keysize invalid; using %u bits\n"), nbits );
}
if( (nbits % 32) ) {
nbits = ((nbits + 31) / 32) * 32;
log_info(_("keysize rounded up to %u bits\n"), nbits );
}
rc = pubkey_generate( algo, nbits, skey, &factors );
if( rc ) {
log_error("pubkey_generate failed: %s\n", gpg_errstr(rc) );
return rc;
}
sk = gcry_xcalloc( 1, sizeof *sk );
pk = gcry_xcalloc( 1, 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 = algo;
pk->pkey[0] = mpi_copy( skey[0] );
pk->pkey[1] = mpi_copy( skey[1] );
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->skey[5] = skey[5];
sk->is_protected = 0;
sk->protect.algo = 0;
sk->csum = checksum_mpi_counted_nbits( sk->skey[2] );
sk->csum += checksum_mpi_counted_nbits( sk->skey[3] );
sk->csum += checksum_mpi_counted_nbits( sk->skey[4] );
sk->csum += checksum_mpi_counted_nbits( sk->skey[5] );
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", gpg_errstr(rc) );
free_public_key(pk);
free_secret_key(sk);
return rc;
}
}
pkt = gcry_xcalloc( 1,sizeof *pkt);
pkt->pkttype = ret_sk ? PKT_PUBLIC_KEY : PKT_PUBLIC_SUBKEY;
pkt->pkt.public_key = pk;
add_kbnode(pub_root, new_kbnode( pkt ));
pkt = gcry_xcalloc( 1,sizeof *pkt);
pkt->pkttype = ret_sk ? PKT_SECRET_KEY : PKT_SECRET_SUBKEY;
pkt->pkt.secret_key = sk;
add_kbnode(sec_root, new_kbnode( pkt ));
return 0;
}
#endif
/****************
* 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 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) RSA (sign and encrypt)\n"), 5 );
#endif
for(;;) {
answer = cpr_get("keygen.algo",_("Your selection? "));
cpr_kill_prompt();
algo = *answer? atoi(answer): 1;
gcry_free(answer);
if( algo == 1 && !addmode ) {
algo = 0; /* create both keys */
break;
}
#if 0
else if( algo == 5 ) {
if( cpr_get_answer_is_yes("keygen.algo.rsa_se",_(
"Do you really want to create a sign and encrypt key? "))) {
algo = GCRY_PK_RSA;
break;
}
}
#endif
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 = GCRY_PK_ELG;
break;
}
}
else if( algo == 3 && addmode ) {
algo = GCRY_PK_ELG_E;
break;
}
else if( algo == 2 ) {
algo = GCRY_PK_DSA;
break;
}
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"),
gcry_pk_algo_name(algo) );
for(;;) {
answer = cpr_get("keygen.size",
_("What keysize do you want? (1024) "));
cpr_kill_prompt();
nbits = *answer? atoi(answer): 1024;
gcry_free(answer);
if( algo == GCRY_PK_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( algo == GCRY_PK_RSA && nbits < 1024 )
tty_printf(_("keysize too small;"
" 1024 is smallest value allowed for RSA.\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() && algo != GCRY_PK_RSA ) {
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 == GCRY_PK_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;
}
/****************
* Parse an expire string and return it's value in days.
* Returns -1 on error.
*/
static int
parse_expire_string( const char *string )
{
int mult;
u32 abs_date=0;
u32 curtime = make_timestamp();
int valid_days;
if( !*string )
valid_days = 0;
else if( (abs_date = scan_isodatestr(string)) && 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(string)) ) {
valid_days = atoi(string) * mult;
if( valid_days < 0 || valid_days > 39447 )
valid_days = 0;
}
else {
valid_days = -1;
}
return valid_days;
}
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(;;) {
u32 curtime=make_timestamp();
gcry_free(answer);
answer = cpr_get("keygen.valid",_("Key is valid for? (0) "));
cpr_kill_prompt();
trim_spaces(answer);
valid_days = parse_expire_string( answer );
if( valid_days < 0 ) {
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((ulong)(curtime + interval) ) );
if( (time_t)((ulong)(curtime+interval)) < 0 )
tty_printf(_("Your system can't display dates beyond 2038.\n"
"However, it will be correctly handled up to 2106.\n"));
}
if( cpr_enabled() || cpr_get_answer_is_yes("keygen.valid.okay",
_("Is this correct (y/n)? ")) )
break;
}
gcry_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;
int fail=0;
if( !aname ) {
for(;;) {
gcry_free(aname);
aname = cpr_get("keygen.name",_("Real name: "));
trim_spaces(aname);
cpr_kill_prompt();
if( opt.allow_freeform_uid )
break;
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(;;) {
gcry_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(;;) {
gcry_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;
}
}
gcry_free(uid);
uid = p = gcry_xmalloc(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 */
#warning quick_random_gen() not available
#if 0
if( quick_random_gen(-1) )
strcpy(p, " (INSECURE!)" );
#endif
/* 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 */
if( !*amail && (strchr( aname, '@' ) || strchr( acomment, '@'))) {
fail = 1;
tty_printf(_("Please don't put the email address "
"into the real name or the comment\n") );
}
for(;;) {
char *ansstr = _("NnCcEeOoQq");
if( strlen(ansstr) != 10 )
BUG();
if( cpr_enabled() ) {
answer = gcry_xstrdup(ansstr+6);
answer[1] = 0;
}
else {
answer = cpr_get("keygen.userid.cmd", fail?
_("Change (N)ame, (C)omment, (E)mail or (Q)uit? ") :
_("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] ) {
gcry_free(aname); aname = NULL;
break;
}
else if( *answer == ansstr[2] || *answer == ansstr[3] ) {
gcry_free(acomment); acomment = NULL;
break;
}
else if( *answer == ansstr[4] || *answer == ansstr[5] ) {
gcry_free(amail); amail = NULL;
break;
}
else if( *answer == ansstr[6] || *answer == ansstr[7] ) {
if( fail ) {
tty_printf(_("Please correct the error first\n"));
}
else {
gcry_free(aname); aname = NULL;
gcry_free(acomment); acomment = NULL;
gcry_free(amail); amail = NULL;
break;
}
}
else if( *answer == ansstr[8] || *answer == ansstr[9] ) {
gcry_free(aname); aname = NULL;
gcry_free(acomment); acomment = NULL;
gcry_free(amail); amail = NULL;
gcry_free(uid); uid = NULL;
break;
}
gcry_free(answer);
}
gcry_free(answer);
if( !amail && !acomment && !amail )
break;
gcry_free(uid); uid = NULL;
}
if( uid ) {
char *p = native_to_utf8( uid );
gcry_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 = gcry_xmalloc_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 ) {
gcry_free(dek); dek = NULL;
gcry_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 rc=0;
if( !opt.batch )
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 == GCRY_PK_ELG || algo == GCRY_PK_ELG_E )
rc = gen_elg(algo, nbits, pub_root, sec_root, dek, s2k, sk, expiredate);
else if( algo == GCRY_PK_DSA )
rc = gen_dsa(nbits, pub_root, sec_root, dek, s2k, sk, expiredate);
#if 0
else if( algo == GCRY_PK_RSA )
rc = gen_rsa(algo, nbits, pub_root, sec_root, dek, s2k, sk, expiredate);
#endif
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 = gcry_xcalloc( 1, sizeof *uid + n - 1 );
uid->len = n;
strcpy(uid->name, p);
return uid;
}
static void
release_parameter_list( struct para_data_s *r )
{
struct para_data_s *r2;
for( ; r ; r = r2 ) {
r2 = r->next;
if( r->key == pPASSPHRASE_DEK )
gcry_free( r->u.dek );
else if( r->key == pPASSPHRASE_S2K )
gcry_free( r->u.s2k );
gcry_free(r);
}
}
static struct para_data_s *
get_parameter( struct para_data_s *para, enum para_name key )
{
struct para_data_s *r;
for( r = para; r && r->key != key; r = r->next )
;
return r;
}
static const char *
get_parameter_value( struct para_data_s *para, enum para_name key )
{
struct para_data_s *r = get_parameter( para, key );
return (r && *r->u.value)? r->u.value : NULL;
}
static int
get_parameter_algo( struct para_data_s *para, enum para_name key )
{
struct para_data_s *r = get_parameter( para, key );
if( !r )
return -1;
if( isdigit( *r->u.value ) )
return atoi( r->u.value );
return gcry_pk_map_name( r->u.value );
}
static u32
get_parameter_u32( struct para_data_s *para, enum para_name key )
{
struct para_data_s *r = get_parameter( para, key );
if( !r )
return 0;
if( r->key == pKEYEXPIRE || r->key == pSUBKEYEXPIRE )
return r->u.expire;
return (unsigned int)strtoul( r->u.value, NULL, 10 );
}
static unsigned int
get_parameter_uint( struct para_data_s *para, enum para_name key )
{
return get_parameter_u32( para, key );
}
static DEK *
get_parameter_dek( struct para_data_s *para, enum para_name key )
{
struct para_data_s *r = get_parameter( para, key );
return r? r->u.dek : NULL;
}
static STRING2KEY *
get_parameter_s2k( struct para_data_s *para, enum para_name key )
{
struct para_data_s *r = get_parameter( para, key );
return r? r->u.s2k : NULL;
}
static int
proc_parameter_file( struct para_data_s *para, const char *fname,
struct output_control_s *outctrl )
{
struct para_data_s *r;
const char *s1, *s2, *s3;
size_t n;
char *p;
int i;
/* check that we have all required parameters */
assert( get_parameter( para, pKEYTYPE ) );
i = get_parameter_algo( para, pKEYTYPE );
if( i < 1 || openpgp_pk_test_algo( i, GCRY_PK_USAGE_SIGN ) ) {
r = get_parameter( para, pKEYTYPE );
log_error("%s:%d: invalid algorithm\n", fname, r->lnr );
return -1;
}
i = get_parameter_algo( para, pSUBKEYTYPE );
if( i > 1 && openpgp_pk_test_algo( i, 0 ) ) {
r = get_parameter( para, pSUBKEYTYPE );
log_error("%s:%d: invalid algorithm\n", fname, r->lnr );
return -1;
}
if( !get_parameter_value( para, pUSERID ) ) {
/* create the formatted user ID */
s1 = get_parameter_value( para, pNAMEREAL );
s2 = get_parameter_value( para, pNAMECOMMENT );
s3 = get_parameter_value( para, pNAMEEMAIL );
if( s1 || s2 || s3 ) {
n = (s1?strlen(s1):0) + (s2?strlen(s2):0) + (s3?strlen(s3):0);
r = gcry_xcalloc( 1, sizeof *r + n + 20 );
r->key = pUSERID;
p = r->u.value;
if( s1 )
p = stpcpy(p, s1 );
if( s2 )
p = stpcpy(stpcpy(stpcpy(p," ("), s2 ),")");
if( s3 )
p = stpcpy(stpcpy(stpcpy(p," <"), s3 ),">");
r->next = para;
para = r;
}
}
/* make DEK and S2K from the Passphrase */
r = get_parameter( para, pPASSPHRASE );
if( r && *r->u.value ) {
/* we have a plain text passphrase - create a DEK from it.
* It is a little bit ridiculous to keep it ih secure memory
* but becuase we do this alwasy, why not here */
STRING2KEY *s2k;
DEK *dek;
s2k = gcry_xmalloc_secure( sizeof *s2k );
s2k->mode = opt.s2k_mode;
s2k->hash_algo = opt.s2k_digest_algo;
set_next_passphrase( r->u.value );
dek = passphrase_to_dek( NULL, 0, opt.s2k_cipher_algo, s2k, 2 );
set_next_passphrase( NULL );
assert( dek );
memset( r->u.value, 0, strlen(r->u.value) );
r = gcry_xcalloc( 1, sizeof *r );
r->key = pPASSPHRASE_S2K;
r->u.s2k = s2k;
r->next = para;
para = r;
r = gcry_xcalloc( 1, sizeof *r );
r->key = pPASSPHRASE_DEK;
r->u.dek = dek;
r->next = para;
para = r;
}
/* make KEYEXPIRE from Expire-Date */
r = get_parameter( para, pEXPIREDATE );
if( r && *r->u.value ) {
i = parse_expire_string( r->u.value );
if( i < 0 ) {
log_error("%s:%d: invalid expire date\n", fname, r->lnr );
return -1;
}
r->u.expire = i * 86400L;
r->key = pKEYEXPIRE; /* change hat entry */
/* also set it for the subkey */
r = gcry_xcalloc( 1, sizeof *r + 20 );
r->key = pSUBKEYEXPIRE;
r->u.expire = i * 86400L;
r->next = para;
para = r;
}
if( !!outctrl->pub.newfname ^ !!outctrl->sec.newfname ) {
log_error("%s:%d: only one ring name is set\n", fname, outctrl->lnr );
return -1;
}
do_generate_keypair( para, outctrl );
return 0;
}
/****************
* Kludge to allow non interactive key generation controlled
* by a parameter file (which currently is only stdin)
* Note, that string parameters are expected to be in UTF-8
*/
static void
read_parameter_file( const char *fname )
{
static struct { const char *name;
enum para_name key;
} keywords[] = {
{ "Key-Type", pKEYTYPE},
{ "Key-Length", pKEYLENGTH },
{ "Subkey-Type", pSUBKEYTYPE },
{ "Subkey-Length", pSUBKEYLENGTH },
{ "Name-Real", pNAMEREAL },
{ "Name-Email", pNAMEEMAIL },
{ "Name-Comment", pNAMECOMMENT },
{ "Expire-Date", pEXPIREDATE },
{ "Passphrase", pPASSPHRASE },
{ NULL, 0 }
};
FILE *fp;
char line[1024], *p;
int lnr;
const char *err = NULL;
struct para_data_s *para, *r;
int i;
struct output_control_s outctrl;
memset( &outctrl, 0, sizeof( outctrl ) );
if( !fname || !*fname || !strcmp(fname,"-") ) {
fp = stdin;
fname = "-";
}
else {
fp = fopen( fname, "r" );
if( !fp ) {
log_error(_("can't open `%s': %s\n"), fname, strerror(errno) );
return;
}
}
lnr = 0;
err = NULL;
para = NULL;
while( fgets( line, DIM(line)-1, fp ) ) {
char *keyword, *value;
lnr++;
if( *line && line[strlen(line)-1] != '\n' ) {
err = "line too long";
break;
}
for( p = line; isspace(*p); p++ )
;
if( !*p || *p == '#' )
continue;
keyword = p;
if( *keyword == '%' ) {
for( ; !isspace(*p); p++ )
;
if( *p )
*p++ = 0;
for( ; isspace(*p); p++ )
;
value = p;
trim_trailing_ws( value, strlen(value) );
if( !stricmp( keyword, "%echo" ) )
log_info("%s\n", value );
else if( !stricmp( keyword, "%dry-run" ) )
outctrl.dryrun = 1;
else if( !stricmp( keyword, "%commit" ) ) {
outctrl.lnr = lnr;
proc_parameter_file( para, fname, &outctrl );
release_parameter_list( para );
para = NULL;
}
else if( !stricmp( keyword, "%pubring" ) ) {
if( outctrl.pub.fname && !strcmp( outctrl.pub.fname, value ) )
; /* still the same file - ignore it */
else {
gcry_free( outctrl.pub.newfname );
outctrl.pub.newfname = gcry_xstrdup( value );
outctrl.use_files = 1;
}
}
else if( !stricmp( keyword, "%secring" ) ) {
if( outctrl.sec.fname && !strcmp( outctrl.sec.fname, value ) )
; /* still the same file - ignore it */
else {
gcry_free( outctrl.sec.newfname );
outctrl.sec.newfname = gcry_xstrdup( value );
outctrl.use_files = 1;
}
}
else
log_info("skipping control `%s' (%s)\n", keyword, value );
continue;
}
if( !(p = strchr( p, ':' )) || p == keyword ) {
err = "missing colon";
break;
}
if( *p )
*p++ = 0;
for( ; isspace(*p); p++ )
;
if( !*p ) {
err = "missing argument";
break;
}
value = p;
trim_trailing_ws( value, strlen(value) );
for(i=0; keywords[i].name; i++ ) {
if( !stricmp( keywords[i].name, keyword ) )
break;
}
if( !keywords[i].name ) {
err = "unknown keyword";
break;
}
if( keywords[i].key != pKEYTYPE && !para ) {
err = "parameter block does not start with \"Key-Type\"";
break;
}
if( keywords[i].key == pKEYTYPE && para ) {
outctrl.lnr = lnr;
proc_parameter_file( para, fname, &outctrl );
release_parameter_list( para );
para = NULL;
}
else {
for( r = para; r; r = r->next ) {
if( r->key == keywords[i].key )
break;
}
if( r ) {
err = "duplicate keyword";
break;
}
}
r = gcry_xcalloc( 1, sizeof *r + strlen( value ) );
r->lnr = lnr;
r->key = keywords[i].key;
strcpy( r->u.value, value );
r->next = para;
para = r;
}
if( err )
log_error("%s:%d: %s\n", fname, lnr, err );
else if( ferror(fp) ) {
log_error("%s:%d: read error: %s\n", fname, lnr, strerror(errno) );
}
else if( para ) {
outctrl.lnr = lnr;
proc_parameter_file( para, fname, &outctrl );
}
if( outctrl.use_files ) { /* close open streams */
iobuf_close( outctrl.pub.stream );
iobuf_close( outctrl.sec.stream );
gcry_free( outctrl.pub.fname );
gcry_free( outctrl.pub.newfname );
gcry_free( outctrl.sec.fname );
gcry_free( outctrl.sec.newfname );
}
release_parameter_list( para );
if( strcmp( fname, "-" ) )
fclose(fp);
}
/****************
* Generate a keypair
* (fname is only used in batch mode)
*/
void
generate_keypair( const char *fname )
{
unsigned int nbits;
char *uid = NULL;
DEK *dek;
STRING2KEY *s2k;
int algo;
int both = 0;
u32 expire;
struct para_data_s *para = NULL;
struct para_data_s *r;
struct output_control_s outctrl;
memset( &outctrl, 0, sizeof( outctrl ) );
if( opt.batch ) {
read_parameter_file( fname );
return;
}
algo = ask_algo( 0 );
if( !algo ) { /* default: DSA with ElG subkey of the specified size */
both = 1;
r = gcry_xcalloc( 1, sizeof *r + 20 );
r->key = pKEYTYPE;
sprintf( r->u.value, "%d", GCRY_PK_DSA );
r->next = para;
para = r;
tty_printf(_("DSA keypair will have 1024 bits.\n"));
r = gcry_xcalloc( 1, sizeof *r + 20 );
r->key = pKEYLENGTH;
strcpy( r->u.value, "1024" );
r->next = para;
para = r;
algo = GCRY_PK_ELG_E;
r = gcry_xcalloc( 1, sizeof *r + 20 );
r->key = pSUBKEYTYPE;
sprintf( r->u.value, "%d", algo );
r->next = para;
para = r;
}
else {
r = gcry_xcalloc( 1, sizeof *r + 20 );
r->key = pKEYTYPE;
sprintf( r->u.value, "%d", algo );
r->next = para;
para = r;
}
nbits = ask_keysize( algo );
r = gcry_xcalloc( 1, sizeof *r + 20 );
r->key = both? pSUBKEYLENGTH : pKEYLENGTH;
sprintf( r->u.value, "%u", nbits);
r->next = para;
para = r;
expire = ask_expire_interval();
r = gcry_xcalloc( 1, sizeof *r + 20 );
r->key = pKEYEXPIRE;
r->u.expire = expire;
r->next = para;
para = r;
r = gcry_xcalloc( 1, sizeof *r + 20 );
r->key = pSUBKEYEXPIRE;
r->u.expire = expire;
r->next = para;
para = r;
uid = ask_user_id(0);
if( !uid ) {
log_error(_("Key generation canceled.\n"));
release_parameter_list( para );
return;
}
r = gcry_xcalloc( 1, sizeof *r + strlen(uid) );
r->key = pUSERID;
strcpy( r->u.value, uid );
r->next = para;
para = r;
dek = ask_passphrase( &s2k );
if( dek ) {
r = gcry_xcalloc( 1, sizeof *r );
r->key = pPASSPHRASE_DEK;
r->u.dek = dek;
r->next = para;
para = r;
r = gcry_xcalloc( 1, sizeof *r );
r->key = pPASSPHRASE_S2K;
r->u.s2k = s2k;
r->next = para;
para = r;
}
proc_parameter_file( para, "[internal]", &outctrl );
release_parameter_list( para );
}
static void
do_generate_keypair( struct para_data_s *para,
struct output_control_s *outctrl )
{
char *pub_fname = NULL;
char *sec_fname = NULL;
KBNODE pub_root = NULL;
KBNODE sec_root = NULL;
PKT_secret_key *sk = NULL;
const char *s;
int rc;
if( outctrl->dryrun ) {
log_info("dry-run mode - key generation skipped\n");
return;
}
if( outctrl->use_files ) {
if( outctrl->pub.newfname ) {
iobuf_close(outctrl->pub.stream);
outctrl->pub.stream = NULL;
gcry_free( outctrl->pub.fname );
outctrl->pub.fname = outctrl->pub.newfname;
outctrl->pub.newfname = NULL;
outctrl->pub.stream = iobuf_create( outctrl->pub.fname );
if( !outctrl->pub.stream ) {
log_error("can't create `%s': %s\n", outctrl->pub.newfname,
strerror(errno) );
return;
}
if( opt.armor ) {
outctrl->pub.afx.what = 1;
iobuf_push_filter( outctrl->pub.stream, armor_filter,
&outctrl->pub.afx );
}
}
if( outctrl->sec.newfname ) {
iobuf_close(outctrl->sec.stream);
outctrl->sec.stream = NULL;
gcry_free( outctrl->sec.fname );
outctrl->sec.fname = outctrl->sec.newfname;
outctrl->sec.newfname = NULL;
outctrl->sec.stream = iobuf_create( outctrl->sec.fname );
if( !outctrl->sec.stream ) {
log_error("can't create `%s': %s\n", outctrl->sec.newfname,
strerror(errno) );
return;
}
if( opt.armor ) {
outctrl->sec.afx.what = 5;
iobuf_push_filter( outctrl->sec.stream, armor_filter,
&outctrl->sec.afx );
}
}
pub_fname = outctrl->pub.fname; /* only for info output */
sec_fname = outctrl->sec.fname; /* only for info output */
assert( outctrl->pub.stream );
assert( outctrl->sec.stream );
}
else {
pub_fname = get_writable_keyblock_file( 0 );
sec_fname = get_writable_keyblock_file( 1 );
}
if( opt.verbose ) {
log_info(_("writing public key to `%s'\n"), pub_fname );
log_info(_("writing secret key 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);
rc = do_create( get_parameter_algo( para, pKEYTYPE ),
get_parameter_uint( para, pKEYLENGTH ),
pub_root, sec_root,
get_parameter_dek( para, pPASSPHRASE_DEK ),
get_parameter_s2k( para, pPASSPHRASE_S2K ),
&sk,
get_parameter_u32( para, pKEYEXPIRE ) );
if( !rc && (s=get_parameter_value(para, pUSERID)) ) {
write_uid(pub_root, s );
if( !rc )
write_uid(sec_root, s );
if( !rc )
rc = write_selfsig(pub_root, pub_root, sk);
if( !rc )
rc = write_selfsig(sec_root, pub_root, sk);
}
if( get_parameter( para, pSUBKEYTYPE ) ) {
rc = do_create( get_parameter_algo( para, pSUBKEYTYPE ),
get_parameter_uint( para, pSUBKEYLENGTH ),
pub_root, sec_root,
get_parameter_dek( para, pPASSPHRASE_DEK ),
get_parameter_s2k( para, pPASSPHRASE_S2K ),
NULL,
get_parameter_u32( para, pSUBKEYEXPIRE ) );
if( !rc )
rc = write_keybinding(pub_root, pub_root, sk);
if( !rc )
rc = write_keybinding(sec_root, pub_root, sk);
}
if( !rc && outctrl->use_files ) { /* direct write to specified files */
rc = write_keyblock( outctrl->pub.stream, pub_root );
if( rc )
log_error("can't write public key: %s\n", gpg_errstr(rc) );
if( !rc ) {
rc = write_keyblock( outctrl->sec.stream, sec_root );
if( rc )
log_error("can't write secret key: %s\n", gpg_errstr(rc) );
}
}
else if( !rc ) { /* write to the standard keyrings */
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 = GPGERR_CREATE_FILE;
}
else if( get_keyblock_handle( pub_fname, 0, &pub_kbpos ) ) {
log_error("can get keyblock handle for `%s'\n", pub_fname );
rc = GPGERR_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 = GPGERR_CREATE_FILE;
}
else if( get_keyblock_handle( sec_fname, 1, &sec_kbpos ) ) {
log_error("can get keyblock handle for `%s'\n", sec_fname );
rc = GPGERR_CREATE_FILE;
}
}
if( rc )
;
else if( (rc=rc1=lock_keyblock( &pub_kbpos )) )
log_error("can't lock public keyring: %s\n", gpg_errstr(rc) );
else if( (rc=rc2=lock_keyblock( &sec_kbpos )) )
log_error("can't lock secret keyring: %s\n", gpg_errstr(rc) );
else if( (rc=insert_keyblock( &pub_kbpos, pub_root )) )
log_error("can't write public key: %s\n", gpg_errstr(rc) );
else if( (rc=insert_keyblock( &sec_kbpos, sec_root )) )
log_error("can't write secret key: %s\n", gpg_errstr(rc) );
else {
if( !opt.batch )
tty_printf(_("public and secret key created and signed.\n") );
if( !opt.batch
&& get_parameter_algo( para, pKEYTYPE ) == GCRY_PK_DSA
&& !get_parameter( para, pSUBKEYTYPE ) )
{
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 ) {
if( opt.batch )
log_error("key generation failed: %s\n", gpg_errstr(rc) );
else
tty_printf(_("Key generation failed: %s\n"), gpg_errstr(rc) );
}
release_kbnode( pub_root );
release_kbnode( sec_root );
if( sk ) /* the unprotected secret key */
free_secret_key(sk);
if( !outctrl->use_files ) {
gcry_free(pub_fname);
gcry_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 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 );
if( !opt.ignore_time_conflict ) {
rc = GPGERR_TIME_CONFLICT;
goto leave;
}
}
/* unprotect to get the passphrase */
switch( is_secret_key_protected( sk ) ) {
case -1:
rc = GPGERR_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( 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 = gcry_xmalloc_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 );
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"), gpg_errstr(rc) );
gcry_free( passphrase );
gcry_free( dek );
gcry_free( s2k );
if( sk ) /* release the copy of the (now unprotected) secret key */
free_secret_key(sk);
set_next_passphrase( NULL );
return okay;
}
/****************
* Write a keyblock to an output stream
*/
static int
write_keyblock( IOBUF out, KBNODE node )
{
for( ; node ; node = node->next ) {
int rc = build_packet( out, node->pkt );
if( rc ) {
log_error("build_packet(%d) failed: %s\n",
node->pkt->pkttype, gpg_errstr(rc) );
return GPGERR_WRITE_FILE;
}
}
return 0;
}
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