1 /* Copyright 2016 Brian Smith.
2  *
3  * Permission to use, copy, modify, and/or distribute this software for any
4  * purpose with or without fee is hereby granted, provided that the above
5  * copyright notice and this permission notice appear in all copies.
6  *
7  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
8  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
10  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14 
15 #ifndef RING_LIMBS_H
16 #define RING_LIMBS_H
17 
18 #include <GFp/base.h>
19 
20 #include "../internal.h"
21 
22 typedef crypto_word Limb;
23 
24 #define LIMB_BITS CRYPTO_WORD_BITS
25 #define LIMB_HIGH_BIT ((Limb)(1) << (LIMB_BITS - 1))
26 
27 
28 Limb LIMBS_are_zero(const Limb a[], size_t num_limbs);
29 Limb LIMBS_are_even(const Limb a[], size_t num_limbs);
30 Limb LIMBS_equal(const Limb a[], const Limb b[], size_t num_limbs);
31 Limb LIMBS_equal_limb(const Limb a[], Limb b, size_t num_limbs);
32 void LIMBS_reduce_once(Limb r[], const Limb m[], size_t num_limbs);
33 void LIMBS_add_mod(Limb r[], const Limb a[], const Limb b[], const Limb m[],
34                    size_t num_limbs);
35 void LIMBS_sub_mod(Limb r[], const Limb a[], const Limb b[], const Limb m[],
36                    size_t num_limbs);
37 void LIMBS_shl_mod(Limb r[], const Limb a[], const Limb m[], size_t num_limbs);
38 Limb GFp_limbs_mul_add_limb(Limb r[], const Limb a[], Limb b, size_t num_limbs);
39 
40 #endif /* RING_LIMBS_H */
41