1/*
2 * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24
25#include "inner.h"
26
27static const unsigned char *
28api_generator(int curve, size_t *len)
29{
30	switch (curve) {
31	case BR_EC_secp256r1:
32#if BR_INT128 || BR_UMUL128
33		return br_ec_p256_m64.generator(curve, len);
34#else
35		return br_ec_p256_m31.generator(curve, len);
36#endif
37	case BR_EC_curve25519:
38#if BR_INT128 || BR_UMUL128
39		return br_ec_c25519_m64.generator(curve, len);
40#else
41		return br_ec_c25519_m31.generator(curve, len);
42#endif
43	default:
44		return br_ec_prime_i31.generator(curve, len);
45	}
46}
47
48static const unsigned char *
49api_order(int curve, size_t *len)
50{
51	switch (curve) {
52	case BR_EC_secp256r1:
53#if BR_INT128 || BR_UMUL128
54		return br_ec_p256_m64.order(curve, len);
55#else
56		return br_ec_p256_m31.order(curve, len);
57#endif
58	case BR_EC_curve25519:
59#if BR_INT128 || BR_UMUL128
60		return br_ec_c25519_m64.order(curve, len);
61#else
62		return br_ec_c25519_m31.order(curve, len);
63#endif
64	default:
65		return br_ec_prime_i31.order(curve, len);
66	}
67}
68
69static size_t
70api_xoff(int curve, size_t *len)
71{
72	switch (curve) {
73	case BR_EC_secp256r1:
74#if BR_INT128 || BR_UMUL128
75		return br_ec_p256_m64.xoff(curve, len);
76#else
77		return br_ec_p256_m31.xoff(curve, len);
78#endif
79	case BR_EC_curve25519:
80#if BR_INT128 || BR_UMUL128
81		return br_ec_c25519_m64.xoff(curve, len);
82#else
83		return br_ec_c25519_m31.xoff(curve, len);
84#endif
85	default:
86		return br_ec_prime_i31.xoff(curve, len);
87	}
88}
89
90static uint32_t
91api_mul(unsigned char *G, size_t Glen,
92	const unsigned char *kb, size_t kblen, int curve)
93{
94	switch (curve) {
95	case BR_EC_secp256r1:
96#if BR_INT128 || BR_UMUL128
97		return br_ec_p256_m64.mul(G, Glen, kb, kblen, curve);
98#else
99		return br_ec_p256_m31.mul(G, Glen, kb, kblen, curve);
100#endif
101	case BR_EC_curve25519:
102#if BR_INT128 || BR_UMUL128
103		return br_ec_c25519_m64.mul(G, Glen, kb, kblen, curve);
104#else
105		return br_ec_c25519_m31.mul(G, Glen, kb, kblen, curve);
106#endif
107	default:
108		return br_ec_prime_i31.mul(G, Glen, kb, kblen, curve);
109	}
110}
111
112static size_t
113api_mulgen(unsigned char *R,
114	const unsigned char *x, size_t xlen, int curve)
115{
116	switch (curve) {
117	case BR_EC_secp256r1:
118#if BR_INT128 || BR_UMUL128
119		return br_ec_p256_m64.mulgen(R, x, xlen, curve);
120#else
121		return br_ec_p256_m31.mulgen(R, x, xlen, curve);
122#endif
123	case BR_EC_curve25519:
124#if BR_INT128 || BR_UMUL128
125		return br_ec_c25519_m64.mulgen(R, x, xlen, curve);
126#else
127		return br_ec_c25519_m31.mulgen(R, x, xlen, curve);
128#endif
129	default:
130		return br_ec_prime_i31.mulgen(R, x, xlen, curve);
131	}
132}
133
134static uint32_t
135api_muladd(unsigned char *A, const unsigned char *B, size_t len,
136	const unsigned char *x, size_t xlen,
137	const unsigned char *y, size_t ylen, int curve)
138{
139	switch (curve) {
140	case BR_EC_secp256r1:
141#if BR_INT128 || BR_UMUL128
142		return br_ec_p256_m64.muladd(A, B, len,
143			x, xlen, y, ylen, curve);
144#else
145		return br_ec_p256_m31.muladd(A, B, len,
146			x, xlen, y, ylen, curve);
147#endif
148	case BR_EC_curve25519:
149#if BR_INT128 || BR_UMUL128
150		return br_ec_c25519_m64.muladd(A, B, len,
151			x, xlen, y, ylen, curve);
152#else
153		return br_ec_c25519_m31.muladd(A, B, len,
154			x, xlen, y, ylen, curve);
155#endif
156	default:
157		return br_ec_prime_i31.muladd(A, B, len,
158			x, xlen, y, ylen, curve);
159	}
160}
161
162/* see bearssl_ec.h */
163const br_ec_impl br_ec_all_m31 = {
164	(uint32_t)0x23800000,
165	&api_generator,
166	&api_order,
167	&api_xoff,
168	&api_mul,
169	&api_mulgen,
170	&api_muladd
171};
172