base
This commit is contained in:
biosvos
@@ -0,0 +1,229 @@
|
||||
/*
|
||||
* Copyright (C) 1998,1999,2000,2001 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 nofb_LTX__init_mcrypt
|
||||
#define _mcrypt_set_state nofb_LTX__mcrypt_set_state
|
||||
#define _mcrypt_get_state nofb_LTX__mcrypt_get_state
|
||||
#define _end_mcrypt nofb_LTX__end_mcrypt
|
||||
#define _mcrypt nofb_LTX__mcrypt
|
||||
#define _mdecrypt nofb_LTX__mdecrypt
|
||||
#define _has_iv nofb_LTX__has_iv
|
||||
#define _is_block_mode nofb_LTX__is_block_mode
|
||||
#define _is_block_algorithm_mode nofb_LTX__is_block_algorithm_mode
|
||||
#define _mcrypt_get_modes_name nofb_LTX__mcrypt_get_modes_name
|
||||
#define _mcrypt_mode_get_size nofb_LTX__mcrypt_mode_get_size
|
||||
#define _mcrypt_mode_version nofb_LTX__mcrypt_mode_version
|
||||
|
||||
typedef struct ncfb_buf {
|
||||
byte* enc_s_register;
|
||||
byte* s_register;
|
||||
int s_register_pos;
|
||||
int blocksize;
|
||||
} nOFB_BUFFER;
|
||||
|
||||
/* nOFB MODE */
|
||||
|
||||
int _init_mcrypt( nOFB_BUFFER* buf, void *key, int lenofkey, void *IV, int size)
|
||||
{
|
||||
buf->enc_s_register = buf->s_register = NULL;
|
||||
buf->s_register_pos = 0;
|
||||
|
||||
buf->blocksize = size;
|
||||
/* For ofb */
|
||||
buf->enc_s_register=malloc( size);
|
||||
if (buf->enc_s_register==NULL) goto freeall;
|
||||
|
||||
buf->s_register=malloc( size);
|
||||
if (buf->s_register==NULL) goto freeall;
|
||||
|
||||
if (IV!=NULL) {
|
||||
memcpy(buf->enc_s_register, IV, size);
|
||||
memcpy(buf->s_register, IV, size);
|
||||
} else {
|
||||
memset(buf->enc_s_register, 0, size);
|
||||
memset(buf->s_register, 0, size);
|
||||
}
|
||||
|
||||
/* End nofb */
|
||||
|
||||
return 0;
|
||||
freeall:
|
||||
free(buf->enc_s_register);
|
||||
free(buf->s_register);
|
||||
return -1;
|
||||
}
|
||||
|
||||
int _mcrypt_set_state( nOFB_BUFFER* buf, byte *IV, int size)
|
||||
{
|
||||
buf->s_register_pos = IV[0];
|
||||
memcpy(buf->enc_s_register, &IV[1], size-1);
|
||||
memcpy(buf->s_register, &IV[1], size-1);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int _mcrypt_get_state( nOFB_BUFFER* buf, byte *IV, int *size)
|
||||
{
|
||||
if (*size < buf->blocksize + 1) {
|
||||
*size = buf->blocksize + 1;
|
||||
return -1;
|
||||
}
|
||||
*size = buf->blocksize + 1;
|
||||
|
||||
IV[0] = buf->s_register_pos;
|
||||
memcpy( &IV[1], buf->s_register, buf->blocksize);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void _end_mcrypt( nOFB_BUFFER* buf) {
|
||||
free(buf->s_register);
|
||||
free(buf->enc_s_register);
|
||||
}
|
||||
|
||||
inline static
|
||||
void xor_stuff( nOFB_BUFFER *buf, void* akey, void (*func)(void*,void*), byte* plain, int blocksize, int xor_size)
|
||||
{
|
||||
void (*_mcrypt_block_encrypt) (void *, void *);
|
||||
|
||||
_mcrypt_block_encrypt = func;
|
||||
|
||||
if (xor_size == blocksize) {
|
||||
if (buf->s_register_pos == 0) {
|
||||
|
||||
memcpy(buf->enc_s_register, buf->s_register, blocksize);
|
||||
|
||||
_mcrypt_block_encrypt(akey, buf->enc_s_register);
|
||||
|
||||
memcpy(buf->s_register, buf->enc_s_register, blocksize);
|
||||
|
||||
memxor( plain, buf->enc_s_register, blocksize);
|
||||
|
||||
} else {
|
||||
int size = blocksize - buf->s_register_pos;
|
||||
|
||||
memxor( plain, &buf->enc_s_register[buf->s_register_pos],
|
||||
size);
|
||||
|
||||
memcpy(buf->enc_s_register, buf->s_register, blocksize);
|
||||
|
||||
_mcrypt_block_encrypt(akey, buf->enc_s_register);
|
||||
|
||||
memcpy( buf->s_register,
|
||||
buf->enc_s_register, blocksize);
|
||||
|
||||
memxor( &plain[size], buf->enc_s_register,
|
||||
buf->s_register_pos);
|
||||
|
||||
/* buf->s_register_pos remains the same */
|
||||
}
|
||||
} else { /* xor_size != blocksize */
|
||||
if (buf->s_register_pos == 0) {
|
||||
memcpy(buf->enc_s_register, buf->s_register, blocksize);
|
||||
|
||||
_mcrypt_block_encrypt(akey, buf->enc_s_register);
|
||||
|
||||
memcpy(buf->s_register, buf->enc_s_register, blocksize);
|
||||
|
||||
memxor( plain, buf->enc_s_register, xor_size);
|
||||
|
||||
buf->s_register_pos = xor_size;
|
||||
} else {
|
||||
int size = blocksize - buf->s_register_pos;
|
||||
int min_size = size < xor_size ? size: xor_size;
|
||||
|
||||
memxor( plain, &buf->enc_s_register[buf->s_register_pos],
|
||||
min_size);
|
||||
|
||||
buf->s_register_pos += min_size;
|
||||
|
||||
if (min_size >= xor_size)
|
||||
return;
|
||||
|
||||
memcpy(buf->enc_s_register, buf->s_register, blocksize);
|
||||
|
||||
_mcrypt_block_encrypt(akey, buf->enc_s_register);
|
||||
|
||||
memcpy(buf->s_register, buf->enc_s_register, blocksize);
|
||||
|
||||
memxor( &plain[min_size], buf->s_register,
|
||||
xor_size - min_size);
|
||||
|
||||
buf->s_register_pos = xor_size - min_size;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
int _mcrypt( nOFB_BUFFER* buf,void *plaintext, int len, int blocksize, void* akey, void (*func)(void*,void*), void (*func2)(void*,void*))
|
||||
{ /* plaintext is n*blocksize bytes (nbit cfb) */
|
||||
byte* plain;
|
||||
int i, j=0;
|
||||
void (*_mcrypt_block_encrypt) (void *, void *);
|
||||
int modlen;
|
||||
|
||||
_mcrypt_block_encrypt = func;
|
||||
|
||||
plain = plaintext;
|
||||
for (j = 0; j < len / blocksize; j++) {
|
||||
xor_stuff( buf, akey, func, plain, blocksize, blocksize);
|
||||
|
||||
plain += blocksize;
|
||||
|
||||
}
|
||||
modlen = len % blocksize;
|
||||
if (modlen > 0) {
|
||||
xor_stuff( buf, akey, func, plain, blocksize, modlen);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int _mdecrypt( nOFB_BUFFER* buf,void *plaintext, int len, int blocksize, void* akey, void (*func)(void*,void*), void (*func2)(void*,void*))
|
||||
{ /* plaintext is n*blocksize bytes (nbit cfb) */
|
||||
return _mcrypt( buf, plaintext, len, blocksize, akey, func, func2);
|
||||
}
|
||||
|
||||
int _has_iv() { return 1; }
|
||||
int _is_block_mode() { return 0; }
|
||||
int _is_block_algorithm_mode() { return 1; }
|
||||
char *_mcrypt_get_modes_name() { return "nOFB";}
|
||||
int _mcrypt_mode_get_size () {return sizeof(nOFB_BUFFER);}
|
||||
|
||||
|
||||
word32 _mcrypt_mode_version() {
|
||||
return 20020307;
|
||||
}
|
||||
|
||||
#ifdef WIN32
|
||||
# ifdef USE_LTDL
|
||||
WIN32DLL_DEFINE int main (void)
|
||||
{
|
||||
/* empty main function to avoid linker error (see cygwin FAQ) */
|
||||
}
|
||||
# endif
|
||||
#endif
|
||||
Reference in New Issue
Block a user