68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
// This is a sub-set of Galois.h , and changed for 8-bit only
|
|
|
|
/* Galois.h
|
|
* James S. Plank
|
|
|
|
Galois.tar - Fast Galois Field Arithmetic Library in C/C++
|
|
Copright (C) 2007 James S. Plank
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
James S. Plank
|
|
Department of Computer Science
|
|
University of Tennessee
|
|
Knoxville, TN 37996
|
|
plank@cs.utk.edu
|
|
|
|
*/
|
|
|
|
#ifndef _GF8_H_
|
|
#define _GF8_H_
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
extern int galois_create_log_tables(void); /* Returns 0 on success, -1 on failure */
|
|
extern int galois_create_mult_tables(void);
|
|
extern int galois_multtable_multiply(int x, int y);
|
|
extern int galois_multtable_divide(int x, int y);
|
|
|
|
extern int galois_power(int x, int y); // 乗数計算用に追加
|
|
extern void galois_free_tables(void); // 解放用に追加
|
|
|
|
void galois_region_xor(
|
|
unsigned char *r1, // Region 1
|
|
unsigned char *r2, // Sum region (r2 = r1 ^ r2)
|
|
int nbytes); // Number of bytes in region
|
|
|
|
void galois_region_multiply(
|
|
unsigned char *r1, // Region to multiply
|
|
unsigned char *r2, // products go here.
|
|
int nbytes, // Number of bytes in region
|
|
int multby); // Number to multiply by
|
|
|
|
#define HASH_SIZE 4
|
|
#define HASH_RANGE 128
|
|
void checksum4(unsigned char *data, unsigned char *hash, int byte_size);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|