3 This file is part of the ARM-Crypto-Lib.
4 Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * \license GPLv3 or later
34 typedef uint8_t bigint_word_t;
35 typedef uint16_t bigint_wordplus_t;
36 typedef int16_t bigint_wordplus_signed_t;
37 #define BIGINT_WORD_SIZE 8
39 #define BIGINT_FBS_MASK (BIGINT_WORD_SIZE-1) /* the last five bits indicate which is the first bit set */
40 #define BIGINT_NEG_MASK 0x80 /* this bit indicates a negative value */
42 typedef size_t bigint_length_t;
43 typedef uint_fast8_t bigint_info_t;
46 bigint_length_t length_W;
48 bigint_word_t *wordv; /* word vector, pointing to the LSB */
53 /******************************************************************************/
55 void bigint_adjust(bigint_t *a);
56 uint32_t bigint_get_first_set_bit(const bigint_t *a);
57 uint32_t bigint_get_last_set_bit(const bigint_t *a);
58 bigint_length_t bigint_length_b(const bigint_t *a);
59 bigint_length_t bigint_length_B(const bigint_t *a);
60 void bigint_copy(bigint_t *dest, const bigint_t *src);
61 void bigint_add_u(bigint_t *dest, const bigint_t *a, const bigint_t *b);
62 void bigint_add_scale_u(bigint_t *dest, const bigint_t *a, bigint_length_t scale);
63 void bigint_sub_u(bigint_t *dest, const bigint_t *a, const bigint_t *b);
64 int8_t bigint_cmp_u(const bigint_t * a, const bigint_t * b);
65 void bigint_add_s(bigint_t *dest, const bigint_t *a, const bigint_t *b);
66 void bigint_sub_s(bigint_t *dest, const bigint_t *a, const bigint_t *b);
67 int8_t bigint_cmp_s(const bigint_t *a, const bigint_t *b);
68 void bigint_shiftleft(bigint_t *a, bigint_length_t shift);
69 void bigint_shiftright(bigint_t *a, bigint_length_t shift);
70 void bigint_xor(bigint_t *dest, const bigint_t *a);
71 void bigint_set_zero(bigint_t *a);
72 void bigint_mul_u(bigint_t *dest, const bigint_t *a, const bigint_t *b);
73 void bigint_mul_s(bigint_t *dest, const bigint_t *a, const bigint_t *b);
74 void bigint_square(bigint_t *dest, const bigint_t *a);
75 void bigint_sub_u_bitscale(bigint_t *a, const bigint_t *b, bigint_length_t bitscale);
76 void bigint_reduce(bigint_t *a, const bigint_t *r);
77 void bigint_mul_word_u(bigint_t *a, bigint_word_t b);
78 void bigint_gcdext(bigint_t *gcd, bigint_t *a, bigint_t *b, const bigint_t *x, const bigint_t *y);
79 void bigint_inverse(bigint_t *dest, const bigint_t *a, const bigint_t *m);
80 void bigint_changeendianess(bigint_t *a);
81 void bigint_clip(bigint_t *dest, bigint_length_t s);
82 void bigint_mont_mul(bigint_t *dest, const bigint_t *a, const bigint_t *b, const bigint_t *m, const bigint_t *m_);
83 void bigint_mont_red(bigint_t *dest, const bigint_t *a, const bigint_t *m, const bigint_t *m_);
84 void bigint_mont_gen_m_(bigint_t* dest, const bigint_t* m);
85 void bigint_mont_trans(bigint_t *dest, const bigint_t *a, const bigint_t *m);
87 void bigint_expmod_u(bigint_t *dest, const bigint_t *a, const bigint_t *exp, const bigint_t *r);
88 void bigint_expmod_u_sam(bigint_t *dest, const bigint_t *a, const bigint_t *exp, const bigint_t *r);
89 void bigint_expmod_u_mont_sam(bigint_t *dest, const bigint_t *a, const bigint_t *exp, const bigint_t *r);