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trezor-firmware/bignum.h
2014-07-07 21:24:10 +02:00

92 lines
2.8 KiB
C

/**
* Copyright (c) 2013-2014 Tomas Dzetkulic
* Copyright (c) 2013-2014 Pavol Rusnak
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef __BIGNUM_H__
#define __BIGNUM_H__
#include <stdint.h>
#include "options.h"
// bignum256 are 256 bits stored as 8*30 bit + 1*16 bit
// val[0] are lowest 30 bits, val[8] highest 16 bits
typedef struct {
uint32_t val[9];
} bignum256;
// read 4 big endian bytes into uint32
uint32_t read_be(const uint8_t *data);
// write 4 big endian bytes
void write_be(uint8_t *data, uint32_t x);
void bn_read_be(const uint8_t *in_number, bignum256 *out_number);
void bn_write_be(const bignum256 *in_number, uint8_t *out_number);
void bn_zero(bignum256 *a);
int bn_is_zero(const bignum256 *a);
int bn_is_less(const bignum256 *a, const bignum256 *b);
int bn_is_equal(const bignum256 *a, const bignum256 *b);
int bn_bitlen(const bignum256 *a);
void bn_lshift(bignum256 *a);
void bn_rshift(bignum256 *a);
void bn_mod(bignum256 *x, const bignum256 *prime);
void bn_addi(bignum256 *a, uint32_t b);
void bn_muli(bignum256 *a, uint32_t b);
void bn_multiply(const bignum256 *k, bignum256 *x, const bignum256 *prime);
void bn_fast_mod(bignum256 *x, const bignum256 *prime);
void bn_sqrt(bignum256 *x, const bignum256 *prime);
void bn_inverse(bignum256 *x, const bignum256 *prime);
void bn_normalize(bignum256 *a);
void bn_addmod(bignum256 *a, const bignum256 *b, const bignum256 *prime);
void bn_addmodi(bignum256 *a, uint32_t b, const bignum256 *prime);
void bn_substract(const bignum256 *a, const bignum256 *b, bignum256 *res);
void bn_substract_noprime(const bignum256 *a, const bignum256 *b, bignum256 *res);
void bn_divmod58(bignum256 *a, uint32_t *r);
#if USE_BN_PRINT
void bn_print(const bignum256 *a);
void bn_print_raw(const bignum256 *a);
#endif
#endif