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
27 static const unsigned char *
api_generator(int curve,size_t * len)28 api_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
48 static const unsigned char *
api_order(int curve,size_t * len)49 api_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
69 static size_t
api_xoff(int curve,size_t * len)70 api_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
90 static uint32_t
api_mul(unsigned char * G,size_t Glen,const unsigned char * kb,size_t kblen,int curve)91 api_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
112 static size_t
api_mulgen(unsigned char * R,const unsigned char * x,size_t xlen,int curve)113 api_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
134 static uint32_t
api_muladd(unsigned char * A,const unsigned char * B,size_t len,const unsigned char * x,size_t xlen,const unsigned char * y,size_t ylen,int curve)135 api_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 */
163 const 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