/* 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 #include #include #include #include #include #include #include "util.h" #include "main.h" #include "packet.h" #include "cipher.h" #include "ttyio.h" #include "options.h" #include "keydb.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 ) ); } static int add_key_expire( PKT_signature *sig, void *opaque ) { PKT_secret_key *sk = opaque; byte buf[8]; u32 u; if( sk->valid_days ) { u = sk->valid_days * 86400L; 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]; 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, 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, u16 valid_days, 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; sk->valid_days = pk->valid_days = valid_days; 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, u16 valid_days ) { 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; sk->valid_days = pk->valid_days = valid_days; 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 ); 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 = tty_get(_("Your selection? ")); tty_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 ) { 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 = tty_get(_("What keysize do you want? (1024) ")); tty_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 ) { tty_printf(_("Keysizes larger than 2048 are not suggested because " "computations take REALLY long!\n")); if( tty_get_answer_is_yes(_( "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 ) { if( tty_get_answer_is_yes(_( "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 int ask_valid_days() { char *answer; int valid_days=0; tty_printf(_("Please specify how long the key should be valid.\n" " 0 = key does not expire\n" " = key expires in n days\n" " w = key expires in n weeks\n" " m = key expires in n months\n" " y = key expires in n years\n")); /* Note: The elgamal subkey for DSA has no exiration date because * is must be signed with the DSA key and this one has the expiration * date */ answer = NULL; for(;;) { int mult; m_free(answer); answer = tty_get(_("Key is valid for? (0) ")); tty_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")); else { /* print the date when the key expires */ tty_printf(_("Key expires at %s\n"), strtimestamp( add_days_to_timestamp( make_timestamp(), valid_days ))); } if( tty_get_answer_is_yes(_("Is this correct (y/n)? ")) ) break; } m_free(answer); return valid_days; } 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) \"\n\n") ); uid = aname = acomment = amail = NULL; for(;;) { char *p; if( !aname ) { for(;;) { m_free(aname); aname = tty_get(_("Real name: ")); trim_spaces(aname); tty_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 = tty_get(_("Email address: ")); trim_spaces(amail); strlwr(amail); tty_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 = tty_get(_("Comment: ")); trim_spaces(acomment); tty_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 = N_("NnCcEeOoQq"); answer = tty_get(_( "Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? ")); tty_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 = 1; s2k->hash_algo = DIGEST_ALGO_RMD160; dek = passphrase_to_dek( NULL, CIPHER_ALGO_BLOWFISH, 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, int valid_days, 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, valid_days, v4_packet? 4:3 ); else if( algo == PUBKEY_ALGO_DSA ) rc = gen_dsa(nbits, pub_root, sec_root, dek, s2k, sk, valid_days); else BUG(); 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 ")")); } 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; int ndays; 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 ); ndays = ask_valid_days(); 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, ndays, 1); else rc = do_create( algo, nbits, pub_root, sec_root, dek, s2k, &sk, ndays, 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, ndays, 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, ndays; 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 ); if( !rc ) passphrase = get_last_passphrase(); break; } if( rc ) goto leave; algo = ask_algo( &v4, 1 ); assert(algo); nbits = ask_keysize( algo ); ndays = ask_valid_days(); if( !tty_get_answer_is_yes( _("Really create? ") ) ) goto leave; if( passphrase ) { s2k = m_alloc_secure( sizeof *s2k ); s2k->mode = 1; s2k->hash_algo = DIGEST_ALGO_RMD160; set_next_passphrase( passphrase ); dek = passphrase_to_dek( NULL, CIPHER_ALGO_BLOWFISH, s2k, 2 ); } rc = do_create( algo, nbits, pub_keyblock, sec_keyblock, dek, s2k, NULL, ndays, 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; }