diff options
Diffstat (limited to 'cipher/pubkey.c')
| -rw-r--r-- | cipher/pubkey.c | 548 |
1 files changed, 0 insertions, 548 deletions
diff --git a/cipher/pubkey.c b/cipher/pubkey.c deleted file mode 100644 index dbdd8ae2..00000000 --- a/cipher/pubkey.c +++ /dev/null @@ -1,548 +0,0 @@ -/* pubkey.c - pubkey dispatcher - * 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 <errno.h> -#include <assert.h> -#include "util.h" -#include "errors.h" -#include "mpi.h" -#include "cipher.h" -#include "elgamal.h" -#include "dsa.h" -#include "dynload.h" - - -#define TABLE_SIZE 10 - -struct pubkey_table_s { - const char *name; - int algo; - int npkey; - int nskey; - int nenc; - int nsig; - int use; - int (*generate)( int algo, unsigned nbits, MPI *skey, MPI **retfactors ); - int (*check_secret_key)( int algo, MPI *skey ); - int (*encrypt)( int algo, MPI *resarr, MPI data, MPI *pkey ); - int (*decrypt)( int algo, MPI *result, MPI *data, MPI *skey ); - int (*sign)( int algo, MPI *resarr, MPI data, MPI *skey ); - int (*verify)( int algo, MPI hash, MPI *data, MPI *pkey, - int (*cmp)(void *, MPI), void *opaquev ); - unsigned (*get_nbits)( int algo, MPI *pkey ); -}; - -static struct pubkey_table_s pubkey_table[TABLE_SIZE]; - - - -static int -dummy_generate( int algo, unsigned nbits, MPI *skey, MPI **retfactors ) -{ log_bug("no generate() for %d\n", algo ); return G10ERR_PUBKEY_ALGO; } - -static int -dummy_check_secret_key( int algo, MPI *skey ) -{ log_bug("no check_secret_key() for %d\n", algo ); return G10ERR_PUBKEY_ALGO; } - -static int -dummy_encrypt( int algo, MPI *resarr, MPI data, MPI *pkey ) -{ log_bug("no encrypt() for %d\n", algo ); return G10ERR_PUBKEY_ALGO; } - -static int -dummy_decrypt( int algo, MPI *result, MPI *data, MPI *skey ) -{ log_bug("no decrypt() for %d\n", algo ); return G10ERR_PUBKEY_ALGO; } - -static int -dummy_sign( int algo, MPI *resarr, MPI data, MPI *skey ) -{ log_bug("no sign() for %d\n", algo ); return G10ERR_PUBKEY_ALGO; } - -static int -dummy_verify( int algo, MPI hash, MPI *data, MPI *pkey, - int (*cmp)(void *, MPI), void *opaquev ) -{ log_bug("no verify() for %d\n", algo ); return G10ERR_PUBKEY_ALGO; } - -static unsigned -dummy_get_nbits( int algo, MPI *pkey ) -{ log_bug("no get_nbits() for %d\n", algo ); return 0; } - - -/**************** - * Put the static entries into the table. - */ -static void -setup_pubkey_table(void) -{ - int i; - - i = 0; - pubkey_table[i].algo = PUBKEY_ALGO_ELGAMAL; - pubkey_table[i].name = elg_get_info( pubkey_table[i].algo, - &pubkey_table[i].npkey, - &pubkey_table[i].nskey, - &pubkey_table[i].nenc, - &pubkey_table[i].nsig, - &pubkey_table[i].use ); - pubkey_table[i].generate = elg_generate; - pubkey_table[i].check_secret_key = elg_check_secret_key; - pubkey_table[i].encrypt = elg_encrypt; - pubkey_table[i].decrypt = elg_decrypt; - pubkey_table[i].sign = elg_sign; - pubkey_table[i].verify = elg_verify; - pubkey_table[i].get_nbits = elg_get_nbits; - if( !pubkey_table[i].name ) - BUG(); - i++; - pubkey_table[i].algo = PUBKEY_ALGO_ELGAMAL_E; - pubkey_table[i].name = elg_get_info( pubkey_table[i].algo, - &pubkey_table[i].npkey, - &pubkey_table[i].nskey, - &pubkey_table[i].nenc, - &pubkey_table[i].nsig, - &pubkey_table[i].use ); - pubkey_table[i].generate = elg_generate; - pubkey_table[i].check_secret_key = elg_check_secret_key; - pubkey_table[i].encrypt = elg_encrypt; - pubkey_table[i].decrypt = elg_decrypt; - pubkey_table[i].sign = elg_sign; - pubkey_table[i].verify = elg_verify; - pubkey_table[i].get_nbits = elg_get_nbits; - if( !pubkey_table[i].name ) - BUG(); - i++; - pubkey_table[i].algo = PUBKEY_ALGO_DSA; - pubkey_table[i].name = dsa_get_info( pubkey_table[i].algo, - &pubkey_table[i].npkey, - &pubkey_table[i].nskey, - &pubkey_table[i].nenc, - &pubkey_table[i].nsig, - &pubkey_table[i].use ); - pubkey_table[i].generate = dsa_generate; - pubkey_table[i].check_secret_key = dsa_check_secret_key; - pubkey_table[i].encrypt = dummy_encrypt; - pubkey_table[i].decrypt = dummy_decrypt; - pubkey_table[i].sign = dsa_sign; - pubkey_table[i].verify = dsa_verify; - pubkey_table[i].get_nbits = dsa_get_nbits; - if( !pubkey_table[i].name ) - BUG(); - i++; - - for( ; i < TABLE_SIZE; i++ ) - pubkey_table[i].name = NULL; -} - - -/**************** - * Try to load all modules and return true if new modules are available - */ -static int -load_pubkey_modules(void) -{ - static int initialized = 0; - static int done = 0; - void *context = NULL; - struct pubkey_table_s *ct; - int ct_idx; - int i; - const char *name; - int any = 0; - - - if( !initialized ) { - cipher_modules_constructor(); - setup_pubkey_table(); - initialized = 1; - return 1; - } - if( done ) - return 0; - done = 1; - for(ct_idx=0, ct = pubkey_table; ct_idx < TABLE_SIZE; ct_idx++,ct++ ) { - if( !ct->name ) - break; - } - if( ct_idx >= TABLE_SIZE-1 ) - BUG(); /* table already full */ - /* now load all extensions */ - while( (name = enum_gnupgext_pubkeys( &context, &ct->algo, - &ct->npkey, &ct->nskey, &ct->nenc, - &ct->nsig, &ct->use, - &ct->generate, - &ct->check_secret_key, - &ct->encrypt, - &ct->decrypt, - &ct->sign, - &ct->verify, - &ct->get_nbits )) ) { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == ct->algo ) - break; - if( pubkey_table[i].name ) { - log_info("skipping pubkey %d: already loaded\n", ct->algo ); - continue; - } - - if( !ct->generate ) ct->generate = dummy_generate; - if( !ct->check_secret_key ) ct->check_secret_key = - dummy_check_secret_key; - if( !ct->encrypt ) ct->encrypt = dummy_encrypt; - if( !ct->decrypt ) ct->decrypt = dummy_decrypt; - if( !ct->sign ) ct->sign = dummy_sign; - if( !ct->verify ) ct->verify = dummy_verify; - if( !ct->get_nbits ) ct->get_nbits= dummy_get_nbits; - /* put it into the table */ - if( g10_opt_verbose > 1 ) - log_info("loaded pubkey %d (%s)\n", ct->algo, name); - ct->name = name; - ct_idx++; - ct++; - any = 1; - /* check whether there are more available table slots */ - if( ct_idx >= TABLE_SIZE-1 ) { - log_info("pubkey table full; ignoring other extensions\n"); - break; - } - } - enum_gnupgext_pubkeys( &context, NULL, NULL, NULL, NULL, NULL, NULL, - NULL, NULL, NULL, NULL, NULL, NULL, NULL ); - return any; -} - - -/**************** - * Map a string to the pubkey algo - */ -int -string_to_pubkey_algo( const char *string ) -{ - int i; - const char *s; - - do { - for(i=0; (s=pubkey_table[i].name); i++ ) - if( !stricmp( s, string ) ) - return pubkey_table[i].algo; - } while( load_pubkey_modules() ); - return 0; -} - - -/**************** - * Map a pubkey algo to a string - */ -const char * -pubkey_algo_to_string( int algo ) -{ - int i; - - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) - return pubkey_table[i].name; - } while( load_pubkey_modules() ); - return NULL; -} - - - -int -check_pubkey_algo( int algo ) -{ - return check_pubkey_algo2( algo, 0 ); -} - -/**************** - * a use of 0 means: don't care - */ -int -check_pubkey_algo2( int algo, unsigned use ) -{ - int i; - - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) { - if( (use & PUBKEY_USAGE_SIG) - && !(pubkey_table[i].use & PUBKEY_USAGE_SIG) ) - return G10ERR_WR_PUBKEY_ALGO; - if( (use & PUBKEY_USAGE_ENC) - && !(pubkey_table[i].use & PUBKEY_USAGE_ENC) ) - return G10ERR_WR_PUBKEY_ALGO; - return 0; /* okay */ - } - } while( load_pubkey_modules() ); - return G10ERR_PUBKEY_ALGO; -} - - - - -/**************** - * Return the number of public key material numbers - */ -int -pubkey_get_npkey( int algo ) -{ - int i; - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) - return pubkey_table[i].npkey; - } while( load_pubkey_modules() ); - if( is_RSA(algo) ) /* special hack, so that we are able to */ - return 2; /* see the RSA keyids */ - return 0; -} - -/**************** - * Return the number of secret key material numbers - */ -int -pubkey_get_nskey( int algo ) -{ - int i; - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) - return pubkey_table[i].nskey; - } while( load_pubkey_modules() ); - if( is_RSA(algo) ) /* special hack, so that we are able to */ - return 6; /* see the RSA keyids */ - return 0; -} - -/**************** - * Return the number of signature material numbers - */ -int -pubkey_get_nsig( int algo ) -{ - int i; - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) - return pubkey_table[i].nsig; - } while( load_pubkey_modules() ); - if( is_RSA(algo) ) /* special hack, so that we are able to */ - return 1; /* see the RSA keyids */ - return 0; -} - -/**************** - * Return the number of encryption material numbers - */ -int -pubkey_get_nenc( int algo ) -{ - int i; - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) - return pubkey_table[i].nenc; - } while( load_pubkey_modules() ); - if( is_RSA(algo) ) /* special hack, so that we are able to */ - return 1; /* see the RSA keyids */ - return 0; -} - -/**************** - * Get the number of nbits from the public key - */ -unsigned -pubkey_nbits( int algo, MPI *pkey ) -{ - int i; - - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) - return (*pubkey_table[i].get_nbits)( algo, pkey ); - } while( load_pubkey_modules() ); - if( is_RSA(algo) ) /* we always wanna see the length of a key :-) */ - return mpi_get_nbits( pkey[0] ); - return 0; -} - - -int -pubkey_generate( int algo, unsigned nbits, MPI *skey, MPI **retfactors ) -{ - int i; - - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) - return (*pubkey_table[i].generate)( algo, nbits, - skey, retfactors ); - } while( load_pubkey_modules() ); - return G10ERR_PUBKEY_ALGO; -} - - -int -pubkey_check_secret_key( int algo, MPI *skey ) -{ - int i; - - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) - return (*pubkey_table[i].check_secret_key)( algo, skey ); - } while( load_pubkey_modules() ); - return G10ERR_PUBKEY_ALGO; -} - - -/**************** - * This is the interface to the public key encryption. - * Encrypt DATA with PKEY and put it into RESARR which - * should be an array of MPIs of size PUBKEY_MAX_NENC (or less if the - * algorithm allows this - check with pubkey_get_nenc() ) - */ -int -pubkey_encrypt( int algo, MPI *resarr, MPI data, MPI *pkey ) -{ - int i, rc; - - /* FIXME: check that data fits into the key (in xxx_encrypt)*/ - - if( DBG_CIPHER ) { - log_debug("pubkey_encrypt: algo=%d\n", algo ); - for(i=0; i < pubkey_get_npkey(algo); i++ ) - log_mpidump(" pkey:", pkey[i] ); - log_mpidump(" data:", data ); - } - - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) { - rc = (*pubkey_table[i].encrypt)( algo, resarr, data, pkey ); - goto ready; - } - } while( load_pubkey_modules() ); - rc = G10ERR_PUBKEY_ALGO; - ready: - if( !rc && DBG_CIPHER ) { - for(i=0; i < pubkey_get_nenc(algo); i++ ) - log_mpidump(" encr:", resarr[i] ); - } - return rc; -} - - - -/**************** - * This is the interface to the public key decryption. - * ALGO gives the algorithm to use and this implicitly determines - * the size of the arrays. - * result is a pointer to a mpi variable which will receive a - * newly allocated mpi or NULL in case of an error. - */ -int -pubkey_decrypt( int algo, MPI *result, MPI *data, MPI *skey ) -{ - int i, rc; - - *result = NULL; /* so the caller can always do an mpi_free */ - if( DBG_CIPHER ) { - log_debug("pubkey_decrypt: algo=%d\n", algo ); - for(i=0; i < pubkey_get_nskey(algo); i++ ) - log_mpidump(" skey:", skey[i] ); - for(i=0; i < pubkey_get_nenc(algo); i++ ) - log_mpidump(" data:", data[i] ); - } - - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) { - rc = (*pubkey_table[i].decrypt)( algo, result, data, skey ); - goto ready; - } - } while( load_pubkey_modules() ); - rc = G10ERR_PUBKEY_ALGO; - ready: - if( !rc && DBG_CIPHER ) { - log_mpidump(" plain:", *result ); - } - return rc; -} - - -/**************** - * This is the interface to the public key signing. - * Sign data with skey and put the result into resarr which - * should be an array of MPIs of size PUBKEY_MAX_NSIG (or less if the - * algorithm allows this - check with pubkey_get_nsig() ) - */ -int -pubkey_sign( int algo, MPI *resarr, MPI data, MPI *skey ) -{ - int i, rc; - - if( DBG_CIPHER ) { - log_debug("pubkey_sign: algo=%d\n", algo ); - for(i=0; i < pubkey_get_nskey(algo); i++ ) - log_mpidump(" skey:", skey[i] ); - log_mpidump(" data:", data ); - } - - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) { - rc = (*pubkey_table[i].sign)( algo, resarr, data, skey ); - goto ready; - } - } while( load_pubkey_modules() ); - rc = G10ERR_PUBKEY_ALGO; - ready: - if( !rc && DBG_CIPHER ) { - for(i=0; i < pubkey_get_nsig(algo); i++ ) - log_mpidump(" sig:", resarr[i] ); - } - return rc; -} - -/**************** - * Verify a public key signature. - * Return 0 if the signature is good - */ -int -pubkey_verify( int algo, MPI hash, MPI *data, MPI *pkey, - int (*cmp)(void *, MPI), void *opaquev ) -{ - int i, rc; - - do { - for(i=0; pubkey_table[i].name; i++ ) - if( pubkey_table[i].algo == algo ) { - rc = (*pubkey_table[i].verify)( algo, hash, data, pkey, - cmp, opaquev ); - goto ready; - } - } while( load_pubkey_modules() ); - rc = G10ERR_PUBKEY_ALGO; - ready: - return rc; -} - |