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/*
* Copyright (c) mjh-EDV Beratung, 1996-1999
* mjh-EDV Beratung - 63263 Neu-Isenburg - Rosenstrasse 12
* Tel +49 6102 328279 - Fax +49 6102 328278
* Email info@mjh.teddy-net.com
*
* Author: Jordan Hrycaj <jordan@mjh.teddy-net.com>
*
* $Id: cipher.h,v 1.1 2000/08/14 20:51:35 jordan Exp $
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*/
#ifndef __CIPHER_H__
#define __CIPHER_H__
#ifndef XPUB
#define XPUB /* extract public interface */
#endif
XPUB
XPUB /* public defs from cipher.c */
XPUB
/* The list of encryption protocols available, if in
doubt enable twofish, alone although the others
are ok, as well */
#define CIPHER_TWOFISH 1 /* best reputation, currently */
#define CIPHER_BLOWFISH 1 /* enables blowfish, and blowfish160 */
#define CIPHER_3DES 1 /* gandpas successor of des */
/* The list of one way functions, available, if in doubt enable
ripemd160, alone although the others are ok, as well. Note
that ripemd160 RMD_FRAME is the default in peks. */
#define MD5_FRAME 1 /* might have alignment problems on a sparc */
#define SHA_FRAME 1 /* enables sha1 */
#define RMD_FRAME 1 /* ripem160, don't disable */
/* set this so we can use 16 bit keys all over the place, this macro
must be any hash, suitable for that purpose */
#define EMULATE_LONG_KEY_HASH "ripemd160"
#define EMULATE_DES24KEY_BY_DES16KEY 1
#define EMULATE_BF20KEY_BY_BF16KEY 1
typedef void (*crypto_fn) (void *, unsigned char *out, const unsigned char *in);
/* cipher and frame instancees */
typedef struct _cipher_desc {
unsigned keylen ; /* bytes needed for the key */
unsigned blocklen ; /* block size in bytes */
crypto_fn crypt ; /* the block ciper to apply */
void *class ; /* opaque referece to the class */
char context [1] ; /* the rest is the external descriptor */
/*VARIABLE SIZE*/
} cipher_desc ;
typedef struct _crc_fns {
void (*first) (void*, const char *buf, unsigned len);
void (*next) (void*, const char *buf, unsigned len);
unsigned char *(*result) (void*);
} crc_fns ;
typedef struct _frame_desc {
unsigned offset ; /* to extract 4 bytes from hash string */
crc_fns crc ; /* the crc set of functins to apply */
void *class ; /* opaque referece to the class */
unsigned mdlen; /* length of the full message digest */
char context [1] ; /* the rest is the external descriptor */
/*VARIABLE SIZE*/
} frame_desc ;
/* user interface to crypto function */
#define XCRYPT(d,out,in) (*(d)->crypt) ((d)->context, out, in)
/* user interface to crc/md functions */
#define XCRCFIRST( d,buf,len) (*(d)->crc.first) ((d)->context, buf, len)
#define XCRCNEXT( d,buf,len) (*(d)->crc.next) ((d)->context, buf, len)
#define XCRCRESULT0(d) (*(d)->crc.result) ((d)->context)
#define XCRCRESULT( d) (XCRCRESULT0 (d) + (d)->offset)
XPUB /* get the classes */
XPUB extern void *find_cipher_class (const char *name);
XPUB extern void *find_frame_class (const char *name);
XPUB extern unsigned cipher_keylen (const char *cipher) ;
XPUB
XPUB /* get all classes by name <cipher-name>/<crc-name> */
XPUB extern int find_classes_by_name
XPUB (void **cipher_class, void **frame_class,
XPUB const char *name);
XPUB
#if 0 /* public export, only */
XPUB /* maximal key length, used */
XPUB #define KEYLENGTH_MAX 16
XPUB
#endif
/* the same as before -- must be kept synchonized */
#define KEYLENGTH_MAX 16
/* get the instances */
extern cipher_desc *create_encryption (void *cipher_class,
const char *key, unsigned len) ;
extern cipher_desc *create_decryption (void *cipher_class,
const char *key, unsigned len) ;
extern cipher_desc *duplicate_cipher (cipher_desc *cipher) ;
extern frame_desc *create_frame (void *frame_class, unsigned offset) ;
extern frame_desc *duplicate_frame (frame_desc *frame);
/* change cipher keys */
extern int change_encryption_key (cipher_desc *, const char *key) ;
extern int change_decryption_key (cipher_desc *, const char *key) ;
/* destroy the instances */
extern void destroy_cipher (cipher_desc *) ;
extern void destroy_frame (frame_desc *) ;
#ifdef USE_PTHREADS
/* support for posix threads */
extern void cipher_sema_create (void *attr);
extern void cipher_sema_destroy (void);
#endif
#endif /* __CIPHER_H__ */
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