mirror of
https://github.com/trezor/trezor-firmware.git
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106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/**
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* Copyright (c) 2013 Tomas Dzetkulic
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* Copyright (c) 2013 Pavol Rusnak
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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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// use precomputed Inverse Values of powers of two
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#ifndef USE_PRECOMPUTED_IV
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#define USE_PRECOMPUTED_IV 1
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#endif
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// use precomputed Curve Points (some scalar multiples of curve base point G)
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#ifndef USE_PRECOMPUTED_CP
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#define USE_PRECOMPUTED_CP 1
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#endif
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// use fast inverse method
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#ifndef USE_INVERSE_FAST
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#define USE_INVERSE_FAST 1
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#endif
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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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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_zero(bignum256 *a);
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int bn_is_zero(const bignum256 *a);
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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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int bn_bitlen(const bignum256 *a);
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void bn_lshift(bignum256 *a);
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void bn_rshift(bignum256 *a);
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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_addmod(bignum256 *a, const bignum256 *b, const bignum256 *prime);
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void bn_addmodi(bignum256 *a, uint32_t b, const bignum256 *prime);
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void bn_substract(const bignum256 *a, const bignum256 *b, bignum256 *res);
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void bn_substract_noprime(const bignum256 *a, const bignum256 *b, bignum256 *res);
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void bn_divmod58(bignum256 *a, uint32_t *r);
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#ifndef BN_PRINT
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#define BN_PRINT 0
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#endif
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#if 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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