mirror of
https://github.com/trezor/trezor-firmware.git
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176 lines
6.8 KiB
C
176 lines
6.8 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 <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include "options.h"
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#define BN_LIMBS 9
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#define BN_BITS_PER_LIMB 29
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#define BN_BASE (1u << BN_BITS_PER_LIMB)
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#define BN_LIMB_MASK ((1u << BN_BITS_PER_LIMB) - 1)
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#define BN_EXTRA_BITS (32 - BN_BITS_PER_LIMB)
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#define BN_BITS_LAST_LIMB (256 - (BN_LIMBS - 1) * BN_BITS_PER_LIMB)
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// Represents the number sum([val[i] * 2**(29*i) for i in range(9))
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typedef struct {
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uint32_t val[BN_LIMBS];
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} bignum256;
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static inline uint32_t read_be(const uint8_t *data) {
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return (((uint32_t)data[0]) << 24) | (((uint32_t)data[1]) << 16) |
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(((uint32_t)data[2]) << 8) | (((uint32_t)data[3]));
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}
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static inline void write_be(uint8_t *data, uint32_t x) {
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data[0] = x >> 24;
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data[1] = x >> 16;
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data[2] = x >> 8;
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data[3] = x;
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}
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static inline uint32_t read_le(const uint8_t *data) {
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return (((uint32_t)data[3]) << 24) | (((uint32_t)data[2]) << 16) |
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(((uint32_t)data[1]) << 8) | (((uint32_t)data[0]));
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}
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static inline void write_le(uint8_t *data, uint32_t x) {
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data[3] = x >> 24;
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data[2] = x >> 16;
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data[1] = x >> 8;
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data[0] = x;
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}
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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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int bn_bitcount(const bignum256 *x);
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unsigned int bn_digitcount(const bignum256 *x);
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void bn_zero(bignum256 *x);
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void bn_one(bignum256 *x);
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int bn_is_zero(const bignum256 *x);
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int bn_is_one(const bignum256 *x);
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int bn_is_less(const bignum256 *x, const bignum256 *y);
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int bn_is_equal(const bignum256 *x, const bignum256 *y);
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void bn_cmov(bignum256 *res, volatile uint32_t cond, const bignum256 *truecase,
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const bignum256 *falsecase);
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void bn_cnegate(volatile uint32_t cond, bignum256 *x, const bignum256 *prime);
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void bn_lshift(bignum256 *x);
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void bn_rshift(bignum256 *x);
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void bn_setbit(bignum256 *x, uint16_t i);
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void bn_clearbit(bignum256 *x, uint16_t i);
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uint32_t bn_testbit(const bignum256 *x, uint16_t i);
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void bn_xor(bignum256 *res, const bignum256 *x, const bignum256 *y);
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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_power_mod(const bignum256 *x, const bignum256 *e,
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const bignum256 *prime, bignum256 *res);
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void bn_sqrt(bignum256 *x, const bignum256 *prime);
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uint32_t inverse_mod_power_two(uint32_t a, uint32_t n);
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void bn_divide_base(bignum256 *x, const bignum256 *prime);
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void bn_normalize(bignum256 *x);
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void bn_add(bignum256 *x, const bignum256 *y);
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void bn_addmod(bignum256 *x, const bignum256 *y, const bignum256 *prime);
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void bn_addi(bignum256 *x, uint32_t y);
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void bn_subi(bignum256 *x, uint32_t y, const bignum256 *prime);
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void bn_subtractmod(const bignum256 *x, const bignum256 *y, bignum256 *res,
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const bignum256 *prime);
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void bn_subtract(const bignum256 *x, const bignum256 *y, bignum256 *res);
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void bn_long_division(bignum256 *x, uint32_t d, bignum256 *q, uint32_t *r);
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void bn_divmod58(bignum256 *x, uint32_t *r);
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void bn_divmod1000(bignum256 *x, uint32_t *r);
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void bn_inverse(bignum256 *x, const bignum256 *prime);
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size_t bn_format(const bignum256 *amount, const char *prefix,
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const char *suffix, unsigned int decimals, int exponent,
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bool trailing, char thousands, char *output,
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size_t output_length);
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// Returns (uint32_t) in_number
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// Assumes in_number < 2**32
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// Assumes in_number is normalized
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static inline uint32_t bn_write_uint32(const bignum256 *in_number) {
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return in_number->val[0] | (in_number->val[1] << BN_BITS_PER_LIMB);
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}
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// Returns (uint64_t) in_number
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// Assumes in_number < 2**64
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// Assumes in_number is normalized
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static inline uint64_t bn_write_uint64(const bignum256 *in_number) {
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uint64_t acc;
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acc = in_number->val[2];
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acc <<= BN_BITS_PER_LIMB;
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acc |= in_number->val[1];
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acc <<= BN_BITS_PER_LIMB;
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acc |= in_number->val[0];
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return acc;
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}
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// y = x
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static inline void bn_copy(const bignum256 *x, bignum256 *y) { *y = *x; }
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// Returns x % 2 == 0
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static inline int bn_is_even(const bignum256 *x) {
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return (x->val[0] & 1) == 0;
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}
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// Returns x % 2 == 0
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static inline int bn_is_odd(const bignum256 *x) { return (x->val[0] & 1) == 1; }
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static inline size_t bn_format_uint64(uint64_t amount, const char *prefix,
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const char *suffix, unsigned int decimals,
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int exponent, bool trailing,
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char thousands, char *output,
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size_t output_length) {
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bignum256 bn_amount;
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bn_read_uint64(amount, &bn_amount);
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return bn_format(&bn_amount, prefix, suffix, decimals, exponent, trailing,
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thousands, output, output_length);
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}
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static inline size_t bn_format_amount(uint64_t amount, const char *prefix,
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const char *suffix, unsigned int decimals,
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char *output, size_t output_length) {
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return bn_format_uint64(amount, prefix, suffix, decimals, 0, false, ',',
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output, output_length);
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}
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#if USE_BN_PRINT
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void bn_print(const bignum256 *x);
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void bn_print_raw(const bignum256 *x);
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#endif
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#endif
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