77 lines
3.1 KiB
C
77 lines
3.1 KiB
C
/* bigint.h */
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/*
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This file is part of the ARM-Crypto-Lib.
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Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file bigint.h
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* \author Daniel Otte
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* \date 2010-02-22
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*
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* \license GPLv3 or later
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*
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*/
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#ifndef BIGINT_H_
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#define BIGINT_H_
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#include <stdint.h>
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typedef uint32_t bigint_word_t;
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typedef uint64_t bigint_wordplus_t;
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typedef int64_t bigint_wordplus_signed_t;
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#define BIGINT_WORD_SIZE 32
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#define BIGINT_FBS_MASK (BIGINT_WORD_SIZE-1) /* the last five bits indicate which is the first bit set */
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#define BIGINT_NEG_MASK 0x80 /* this bit indicates a negative value */
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typedef struct{
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uint16_t length_B;
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uint8_t info;
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bigint_word_t *wordv; /* word vector, pointing to the LSB */
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}bigint_t;
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/******************************************************************************/
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void bigint_adjust(bigint_t* a);
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uint32_t bigint_get_first_set_bit(const bigint_t* a);
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uint32_t bigint_get_last_set_bit(const bigint_t* a);
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uint16_t bigint_length_b(const bigint_t* a);
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uint16_t bigint_length_B(const bigint_t* a);
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void bigint_copy(bigint_t* dest, const bigint_t* src);
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void bigint_add_u(bigint_t* dest, const bigint_t* a, const bigint_t* b);
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void bigint_add_scale_u(bigint_t* dest, const bigint_t* a, uint16_t scale);
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void bigint_sub_u(bigint_t* dest, const bigint_t* a, const bigint_t* b);
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int8_t bigint_cmp_u(const bigint_t * a, const bigint_t * b);
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void bigint_add_s(bigint_t* dest, const bigint_t* a, const bigint_t* b);
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void bigint_sub_s(bigint_t* dest, const bigint_t* a, const bigint_t* b);
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int8_t bigint_cmp_s(const bigint_t* a, const bigint_t* b);
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void bigint_shiftleft(bigint_t* a, uint16_t shift);
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void bigint_shiftright(bigint_t* a, uint16_t shift);
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void bigint_xor(bigint_t* dest, const bigint_t* a);
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void bigint_set_zero(bigint_t* a);
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void bigint_mul_u(bigint_t* dest, const bigint_t* a, const bigint_t* b);
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void bigint_mul_s(bigint_t* dest, const bigint_t* a, const bigint_t* b);
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void bigint_square(bigint_t* dest, const bigint_t* a);
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void bigint_sub_u_bitscale(bigint_t* a, const bigint_t* b, uint16_t bitscale);
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void bigint_reduce(bigint_t* a, const bigint_t* r);
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void bigint_expmod_u(bigint_t* dest, const bigint_t* a, const bigint_t* exp, const bigint_t* r);
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void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, const bigint_t* y);
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void bigint_inverse(bigint_t* dest, const bigint_t* a, const bigint_t* m);
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void bigint_changeendianess(bigint_t* a);
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/******************************************************************************/
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#endif /*BIGINT_H_*/
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