172 lines
4.2 KiB
C
172 lines
4.2 KiB
C
/*
|
|
* Copyright (C) 1998,1999,2000,2001,2002 Nikos Mavroyanopoulos
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <libdefs.h>
|
|
#include <mcrypt_modules.h>
|
|
|
|
#define _init_mcrypt cfb_LTX__init_mcrypt
|
|
#define _mcrypt_set_state cfb_LTX__mcrypt_set_state
|
|
#define _mcrypt_get_state cfb_LTX__mcrypt_get_state
|
|
#define _end_mcrypt cfb_LTX__end_mcrypt
|
|
#define _mcrypt cfb_LTX__mcrypt
|
|
#define _mdecrypt cfb_LTX__mdecrypt
|
|
#define _has_iv cfb_LTX__has_iv
|
|
#define _is_block_mode cfb_LTX__is_block_mode
|
|
#define _is_block_algorithm_mode cfb_LTX__is_block_algorithm_mode
|
|
#define _mcrypt_get_modes_name cfb_LTX__mcrypt_get_modes_name
|
|
#define _mcrypt_mode_get_size cfb_LTX__mcrypt_mode_get_size
|
|
#define _mcrypt_mode_version cfb_LTX__mcrypt_mode_version
|
|
|
|
typedef struct cfb_buf {
|
|
byte* s_register;
|
|
byte* enc_s_register;
|
|
int blocksize;
|
|
} CFB_BUFFER;
|
|
|
|
/* CFB MODE */
|
|
|
|
int _init_mcrypt( CFB_BUFFER* buf, void *key, int lenofkey, void *IV, int size)
|
|
{
|
|
|
|
buf->s_register = buf->enc_s_register = NULL;
|
|
|
|
buf->blocksize = size;
|
|
/* For cfb */
|
|
buf->s_register=malloc( size);
|
|
if (buf->s_register==NULL) goto freeall;
|
|
|
|
buf->enc_s_register=malloc( size);
|
|
if (buf->enc_s_register==NULL) goto freeall;
|
|
|
|
if (IV!=NULL) {
|
|
memcpy(buf->s_register, IV, size);
|
|
} else {
|
|
memset(buf->s_register, 0, size);
|
|
}
|
|
/* End cfb */
|
|
return 0;
|
|
|
|
freeall:
|
|
free(buf->s_register);
|
|
free(buf->enc_s_register);
|
|
return -1;
|
|
}
|
|
|
|
|
|
int _mcrypt_set_state( CFB_BUFFER* buf, void *IV, int size)
|
|
{
|
|
memcpy(buf->enc_s_register, IV, size);
|
|
memcpy(buf->s_register, IV, size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int _mcrypt_get_state( CFB_BUFFER* buf, byte *IV, int *size)
|
|
{
|
|
if (*size < buf->blocksize) {
|
|
*size = buf->blocksize;
|
|
return -1;
|
|
}
|
|
*size = buf->blocksize;
|
|
|
|
memcpy( IV, buf->s_register, buf->blocksize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void _end_mcrypt( CFB_BUFFER* buf) {
|
|
free(buf->s_register);
|
|
free(buf->enc_s_register);
|
|
}
|
|
|
|
int _mcrypt( CFB_BUFFER* buf, void *plaintext, int len, int blocksize, void* akey, void (*func)(void*,void*), void (*func2)(void*,void*))
|
|
{ /* plaintext is 1 byte (8bit cfb) */
|
|
char *plain = plaintext;
|
|
int i, j;
|
|
void (*_mcrypt_block_encrypt) (void *, void *);
|
|
|
|
_mcrypt_block_encrypt = func;
|
|
|
|
for (j = 0; j < len; j++) {
|
|
|
|
memcpy(buf->enc_s_register, buf->s_register, blocksize);
|
|
|
|
_mcrypt_block_encrypt(akey, buf->enc_s_register);
|
|
|
|
plain[j] ^= buf->enc_s_register[0];
|
|
|
|
/* Shift the register */
|
|
for (i = 0; i < (blocksize - 1); i++)
|
|
buf->s_register[i] = buf->s_register[i + 1];
|
|
|
|
buf->s_register[blocksize - 1] = plain[j];
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
int _mdecrypt( CFB_BUFFER* buf, void *plaintext, int len, int blocksize, void* akey, void (*func)(void*,void*), void (*func2)(void*,void*))
|
|
{ /* plaintext is 1 byte (8bit ofb) */
|
|
char *plain = plaintext;
|
|
int i, j;
|
|
void (*_mcrypt_block_encrypt) (void *, void *);
|
|
|
|
_mcrypt_block_encrypt = func;
|
|
|
|
for (j = 0; j < len; j++) {
|
|
|
|
memcpy(buf->enc_s_register, buf->s_register, blocksize);
|
|
|
|
_mcrypt_block_encrypt(akey, buf->enc_s_register);
|
|
|
|
/* Shift the register */
|
|
for (i = 0; i < (blocksize - 1); i++)
|
|
buf->s_register[i] = buf->s_register[i + 1];
|
|
|
|
buf->s_register[blocksize - 1] = plain[j];
|
|
|
|
plain[j] ^= buf->enc_s_register[0];
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int _has_iv() { return 1; }
|
|
int _is_block_mode() { return 0; }
|
|
int _is_block_algorithm_mode() { return 1; }
|
|
const char *_mcrypt_get_modes_name() { return "CFB"; }
|
|
int _mcrypt_mode_get_size () {return sizeof(CFB_BUFFER);}
|
|
|
|
word32 _mcrypt_mode_version() {
|
|
return 20020310;
|
|
}
|
|
|
|
#ifdef WIN32
|
|
# ifdef USE_LTDL
|
|
WIN32DLL_DEFINE int main (void)
|
|
{
|
|
/* empty main function to avoid linker error (see cygwin FAQ) */
|
|
}
|
|
# endif
|
|
#endif
|