mirror of
https://github.com/trezor/trezor-firmware.git
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156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
/**
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* Copyright (c) 2013-2014 Tomas Dzetkulic
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* Copyright (c) 2013-2014 Pavol Rusnak
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* Copyright (c) 2016 Alex Beregszaszi
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __BIGNUM_H__
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#define __BIGNUM_H__
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#include <stdint.h>
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#include "options.h"
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// bignum256 are 256 bits stored as 8*30 bit + 1*16 bit
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// val[0] are lowest 30 bits, val[8] highest 16 bits
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typedef struct {
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uint32_t val[9];
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} bignum256;
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// read 4 big endian bytes into uint32
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uint32_t read_be(const uint8_t *data);
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// write 4 big endian bytes
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void write_be(uint8_t *data, uint32_t x);
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// read 4 little endian bytes into uint32
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uint32_t read_le(const uint8_t *data);
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// write 4 little endian bytes
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void write_le(uint8_t *data, uint32_t x);
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void bn_read_be(const uint8_t *in_number, bignum256 *out_number);
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void bn_write_be(const bignum256 *in_number, uint8_t *out_number);
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void bn_read_le(const uint8_t *in_number, bignum256 *out_number);
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void bn_write_le(const bignum256 *in_number, uint8_t *out_number);
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void bn_read_uint32(uint32_t in_number, bignum256 *out_number);
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void bn_read_uint64(uint64_t in_number, bignum256 *out_number);
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static inline uint32_t bn_write_uint32(const bignum256 *in_number)
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{
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return in_number->val[0] | (in_number->val[1] << 30);
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}
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static inline uint64_t bn_write_uint64(const bignum256 *in_number)
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{
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uint64_t tmp;
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tmp = in_number->val[2];
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tmp <<= 30;
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tmp |= in_number->val[1];
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tmp <<= 30;
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tmp |= in_number->val[0];
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return tmp;
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}
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// copies number a to b
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static inline void bn_copy(const bignum256 *a, bignum256 *b) {
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*b = *a;
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}
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int bn_bitcount(const bignum256 *a);
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void bn_zero(bignum256 *a);
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int bn_is_zero(const bignum256 *a);
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void bn_one(bignum256 *a);
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static inline int bn_is_even(const bignum256 *a) {
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return (a->val[0] & 1) == 0;
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}
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static inline int bn_is_odd(const bignum256 *a) {
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return (a->val[0] & 1) == 1;
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}
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int bn_is_less(const bignum256 *a, const bignum256 *b);
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int bn_is_equal(const bignum256 *a, const bignum256 *b);
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void bn_cmov(bignum256 *res, int cond, const bignum256 *truecase, const bignum256 *falsecase);
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void bn_lshift(bignum256 *a);
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void bn_rshift(bignum256 *a);
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void bn_setbit(bignum256 *a, uint8_t bit);
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void bn_clearbit(bignum256 *a, uint8_t bit);
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uint32_t bn_testbit(bignum256 *a, uint8_t bit);
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void bn_xor(bignum256 *a, const bignum256 *b, const bignum256 *c);
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void bn_mult_half(bignum256 *x, const bignum256 *prime);
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void bn_mult_k(bignum256 *x, uint8_t k, const bignum256 *prime);
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void bn_mod(bignum256 *x, const bignum256 *prime);
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void bn_multiply(const bignum256 *k, bignum256 *x, const bignum256 *prime);
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void bn_fast_mod(bignum256 *x, const bignum256 *prime);
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void bn_sqrt(bignum256 *x, const bignum256 *prime);
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void bn_inverse(bignum256 *x, const bignum256 *prime);
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void bn_normalize(bignum256 *a);
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void bn_add(bignum256 *a, const bignum256 *b);
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void bn_addmod(bignum256 *a, const bignum256 *b, const bignum256 *prime);
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void bn_addi(bignum256 *a, uint32_t b);
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void bn_subi(bignum256 *a, uint32_t b, const bignum256 *prime);
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void bn_subtractmod(const bignum256 *a, const bignum256 *b, bignum256 *res, const bignum256 *prime);
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void bn_subtract(const bignum256 *a, const bignum256 *b, bignum256 *res);
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void bn_divmod58(bignum256 *a, uint32_t *r);
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void bn_divmod1000(bignum256 *a, uint32_t *r);
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int bn_format(const bignum256 *amnt, const char *prefix, const char *suffix, int decimals, char *out, int outlen);
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#if USE_BN_PRINT
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void bn_print(const bignum256 *a);
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void bn_print_raw(const bignum256 *a);
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#endif
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#endif
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