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	/* keygen.c - generate a key pair
	* 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 <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_secret_key *sk = opaque;
	byte buf[8];
	u32 u;

	if( sk->expiredate ) {
	u = sk->expiredate;
	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_BLOWFISH;
	buf[1] = CIPHER_ALGO_CAST5;
	build_sig_subpkt( sig, SIGSUBPKT_PREF_SYM, buf, 2 );

	buf[0] = DIGEST_ALGO_RMD160;
	buf[1] = DIGEST_ALGO_SHA1;
	buf[2] = DIGEST_ALGO_TIGER;
	buf[3] = DIGEST_ALGO_MD5;
	build_sig_subpkt( sig, SIGSUBPKT_PREF_HASH, buf, 4 );

	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, sk );
	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, sk );
	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 expiredate,
	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( expiredate && expiredate < sk->timestamp )
	expiredate = sk->timestamp; /* key generatio may take long */
	sk->expiredate = pk->expiredate = expiredate;
	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 expiredate )
	{
	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( expiredate && expiredate < pk->timestamp )
	expiredate = pk->timestamp; /* key generation may take long */
	sk->expiredate = pk->expiredate = expiredate;
	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) ElGamal (sign and encrypt)\n"), 2 );
	if( addmode )
	tty_printf( _(" (%d) ElGamal (encrypt only)\n"), 3 );
	tty_printf( _(" (%d) DSA (sign only)\n"), 4 );
	tty_printf( _(" (%d) ElGamal in a v3 packet\n"), 5 );

	*ret_v4 = 1;
	for(;;) {
	answer = cpr_get(N_("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 == 2 ) {
	algo = PUBKEY_ALGO_ELGAMAL;
	break;
	}
	else if( algo == 3 && addmode ) {
	algo = PUBKEY_ALGO_ELGAMAL_E;
	break;
	}
	else if( algo == 4 ) {
	algo = PUBKEY_ALGO_DSA;
	break;
	}
	else if( algo == 5 ) {
	algo = PUBKEY_ALGO_ELGAMAL_E;
	*ret_v4 = 0;
	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"),
	pubkey_algo_to_string(algo) );
	for(;;) {
	answer = cpr_get(N_("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 > 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(N_("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(N_("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;
	}


	u32
	ask_expiredate()
	{
	char *answer;
	int valid_days=0;
	u32 expiredate = 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 exiration date because
	* it must be signed with the DSA key and this one has the expiration
	* date */

	answer = NULL;
	for(;;) {
	int mult;

	m_free(answer);
	answer = cpr_get(N_("keygen.valid"),_("Key is valid for? (0) "));
	cpr_kill_prompt();
	trim_spaces(answer);
	if( !*answer )
	valid_days = 0;
	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"));
	expiredate = 0;
	}
	else {
	expiredate = make_timestamp() + valid_days * 86400L;
	/* print the date when the key expires */
	tty_printf(_("Key expires at %s\n"), asctimestamp(expiredate) );
	}

	if( !cpr_enabled()
	&& cpr_get_answer_is_yes(N_("keygen.valid.okay"),
	_("Is this correct (y/n)? ")) )
	break;
	}
	m_free(answer);
	return expiredate;
	}


	static int
	has_invalid_email_chars( const char *s )
	{
	for( ; *s; s++ ) {
	if( *s & 0x80 )
	return 1;
	if( !strchr("01234567890abcdefghijklmnopqrstuvwxyz_-.@", *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(N_("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(N_("keygen.email"),_("Email address: "));
	trim_spaces(amail);
	strlwr(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(N_("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!)" );


	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(N_("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;
	}
	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, 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 (work in another window, move the mouse, utilize the\n"
	"network and the disks) during the prime generation; this gives the random\n"
	"number 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 cancelled
	*/
	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 expiredate;
	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 );
	expiredate = ask_expiredate();
	uid = ask_user_id(0);
	if( !uid ) {
	log_error(_("Key generation cancelled.\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, expiredate, 1);
	else
	rc = do_create( algo, nbits, pub_root, sec_root,
	dek, s2k, &sk, expiredate, 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, expiredate, 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 \"--add-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 expiredate;
	unsigned nbits;
	char *passphrase = NULL;
	DEK *dek = NULL;
	STRING2KEY *s2k = NULL;

	/* 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 );
	/* 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 );
	expiredate = ask_expiredate();
	if( !cpr_enabled() && !cpr_get_answer_is_yes(N_("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, opt.s2k_cipher_algo, s2k, 2 );
	}

	rc = do_create( algo, nbits, pub_keyblock, sec_keyblock,
	dek, s2k, NULL, expiredate, 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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