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/* cipher.h
* Copyright (c) 1997 by Werner Koch (dd9jn)
*
* ATTENTION: This code should not be exported from the United States
* nor should it be used their without a license agreement with PKP.
* The RSA alorithm is protected by U.S. Patent #4,405,829 which
* expires on September 20, 2000!
*
* This file is part of G10.
*
* G10 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.
*
* G10 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
*/
#ifndef G10_CIPHER_H
#define G10_CIPHER_H
#define DBG_CIPHER g10c_debug_mode
#include "mpi.h"
#include "../cipher/md.h"
#ifdef HAVE_RSA_CIPHER
#include "../cipher/rsa.h"
#endif
#include "../cipher/elgamal.h"
#include "../cipher/dsa.h"
#include "../cipher/random.h"
#define CIPHER_ALGO_NONE 0
#define CIPHER_ALGO_IDEA 1
#define CIPHER_ALGO_3DES 2
#define CIPHER_ALGO_CAST5 3
#define CIPHER_ALGO_BLOWFISH 4 /* blowfish 128 bit key */
#define CIPHER_ALGO_SAFER_SK128 5
#define CIPHER_ALGO_DES_SK 6
#define CIPHER_ALGO_BLOWFISH160 42 /* blowfish 160 bit key (not in OpenPGP)*/
#define CIPHER_ALGO_DUMMY 110 /* no encryption at all */
#define PUBKEY_ALGO_RSA 1
#define PUBKEY_ALGO_RSA_E 2 /* RSA encrypt only */
#define PUBKEY_ALGO_RSA_S 3 /* RSA sign only */
#define PUBKEY_ALGO_ELGAMAL_E 16 /* encrypt only ElGamal (but not vor v3)*/
#define PUBKEY_ALGO_DSA 17
#define PUBKEY_ALGO_ELGAMAL 20 /* sign and encrypt elgamal */
#define DIGEST_ALGO_MD5 1
#define DIGEST_ALGO_SHA1 2
#define DIGEST_ALGO_RMD160 3
#ifdef WITH_TIGER_HASH
#define DIGEST_ALGO_TIGER 6
#endif
#define is_RSA(a) ((a)==PUBKEY_ALGO_RSA || (a)==PUBKEY_ALGO_RSA_E \
|| (a)==PUBKEY_ALGO_RSA_S )
#define is_ELGAMAL(a) ((a)==PUBKEY_ALGO_ELGAMAL || (a)==PUBKEY_ALGO_ELGAMAL_E)
typedef struct {
int algo;
int keylen;
byte key[20]; /* this is the largest used keylen */
} DEK;
typedef struct cipher_handle_s *CIPHER_HANDLE;
#ifndef DEFINES_CIPHER_HANDLE
struct cipher_handle_s { char does_not_matter[1]; };
#endif
#define CIPHER_MODE_ECB 1
#define CIPHER_MODE_CFB 2
#define CIPHER_MODE_PHILS_CFB 3
#define CIPHER_MODE_AUTO_CFB 4
#define CIPHER_MODE_DUMMY 5 /* used with algo DUMMY for no encryption */
int g10c_debug_mode;
int g10_opt_verbose;
/*-- dynload.c --*/
void register_cipher_extension( const char *fname );
/*-- cipher.c --*/
int string_to_cipher_algo( const char *string );
const char * cipher_algo_to_string( int algo );
int check_cipher_algo( int algo );
unsigned cipher_get_keylen( int algo );
CIPHER_HANDLE cipher_open( int algo, int mode, int secure );
void cipher_close( CIPHER_HANDLE c );
void cipher_setkey( CIPHER_HANDLE c, byte *key, unsigned keylen );
void cipher_setiv( CIPHER_HANDLE c, const byte *iv );
void cipher_encrypt( CIPHER_HANDLE c, byte *out, byte *in, unsigned nbytes );
void cipher_decrypt( CIPHER_HANDLE c, byte *out, byte *in, unsigned nbytes );
void cipher_sync( CIPHER_HANDLE c );
/*-- pubkey.c --*/
#define PUBKEY_MAX_NPKEY 4
#define PUBKEY_MAX_NSKEY 6
#define PUBKEY_MAX_NSIG 2
#define PUBKEY_MAX_NENC 2
int string_to_pubkey_algo( const char *string );
const char * pubkey_algo_to_string( int algo );
int check_pubkey_algo( int algo );
int check_pubkey_algo2( int algo, unsigned usage );
int pubkey_get_npkey( int algo );
int pubkey_get_nskey( int algo );
int pubkey_get_nsig( int algo );
int pubkey_get_nenc( int algo );
unsigned pubkey_nbits( int algo, MPI *pkey );
int pubkey_generate( int algo, unsigned nbits, MPI *skey, MPI **retfactors );
int pubkey_check_secret_key( int algo, MPI *skey );
int pubkey_encrypt( int algo, MPI *resarr, MPI data, MPI *pkey );
int pubkey_decrypt( int algo, MPI *result, MPI *data, MPI *skey );
int pubkey_sign( int algo, MPI *resarr, MPI hash, MPI *skey );
int pubkey_verify( int algo, MPI hash, MPI *data, MPI *pkey );
/*-- smallprime.c --*/
extern ushort small_prime_numbers[];
/*-- primegen.c --*/
MPI generate_secret_prime( unsigned nbits );
MPI generate_public_prime( unsigned nbits );
MPI generate_elg_prime( int mode, unsigned pbits, unsigned qbits,
MPI g, MPI **factors );
#endif /*G10_CIPHER_H*/
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