mathctx.h

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/*
This file is part of BitPunch
Copyright (C) 2014-2015 Frantisek Uhrecky <frantisek.uhrecky[what here]gmail.com>

This program 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 3 of the License, or
(at your option) any later version.

This program 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef BPU_MATHCTX_H
#define BPU_MATHCTX_H

#include "gf2xtypes.h"

// polynomials in format BPU_GF2_POLY_DEG_m where 'm' is mceliece param m
#define BPU_GF2_POLY_DEG_5 0x3b
#define BPU_GF2_POLY_DEG_6 0x43
#define BPU_GF2_POLY_DEG_10 0x71d
#define BPU_GF2_POLY_DEG_11 0x805

typedef struct _BPU_T_Math_Ctx {
        BPU_T_GF2_16x *exp_table; 
        BPU_T_GF2_16x *log_table; 
        BPU_T_GF2_16x mod; 
    uint8_t mod_deg; 
        int ord; 
}BPU_T_Math_Ctx;

int BPU_mathInitCtx(BPU_T_Math_Ctx **ctx, const BPU_T_GF2_16x g, const BPU_T_GF2_16x mod);

void BPU_mathFreeCtx(BPU_T_Math_Ctx **ctx);

#endif // BPU_MATHCTX_H