1 /******************************************************************************
2  *
3  *  Copyright (C) 2006-2015 Broadcom Corporation
4  *
5  *  Licensed under the Apache License, Version 2.0 (the "License");
6  *  you may not use this file except in compliance with the License.
7  *  You may obtain a copy of the License at:
8  *
9  *  http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  ******************************************************************************/
18 
19 /*******************************************************************************
20  *
21  *  This file contains simple pairing algorithms
22  *
23  ******************************************************************************/
24 
25 #include <string.h>
26 #include "p_256_ecc_pp.h"
27 
p_256_init_curve(uint32_t keyLength)28 void p_256_init_curve(uint32_t keyLength) {
29   elliptic_curve_t* ec;
30 
31   if (keyLength == KEY_LENGTH_DWORDS_P256) {
32     ec = &curve_p256;
33 
34     ec->p[7] = 0xFFFFFFFF;
35     ec->p[6] = 0x00000001;
36     ec->p[5] = 0x0;
37     ec->p[4] = 0x0;
38     ec->p[3] = 0x0;
39     ec->p[2] = 0xFFFFFFFF;
40     ec->p[1] = 0xFFFFFFFF;
41     ec->p[0] = 0xFFFFFFFF;
42 
43     memset(ec->omega, 0, KEY_LENGTH_DWORDS_P256);
44     memset(ec->a, 0, KEY_LENGTH_DWORDS_P256);
45 
46     ec->a_minus3 = true;
47 
48     // b
49     ec->b[7] = 0x5ac635d8;
50     ec->b[6] = 0xaa3a93e7;
51     ec->b[5] = 0xb3ebbd55;
52     ec->b[4] = 0x769886bc;
53     ec->b[3] = 0x651d06b0;
54     ec->b[2] = 0xcc53b0f6;
55     ec->b[1] = 0x3bce3c3e;
56     ec->b[0] = 0x27d2604b;
57 
58     // base point
59     ec->G.x[7] = 0x6b17d1f2;
60     ec->G.x[6] = 0xe12c4247;
61     ec->G.x[5] = 0xf8bce6e5;
62     ec->G.x[4] = 0x63a440f2;
63     ec->G.x[3] = 0x77037d81;
64     ec->G.x[2] = 0x2deb33a0;
65     ec->G.x[1] = 0xf4a13945;
66     ec->G.x[0] = 0xd898c296;
67 
68     ec->G.y[7] = 0x4fe342e2;
69     ec->G.y[6] = 0xfe1a7f9b;
70     ec->G.y[5] = 0x8ee7eb4a;
71     ec->G.y[4] = 0x7c0f9e16;
72     ec->G.y[3] = 0x2bce3357;
73     ec->G.y[2] = 0x6b315ece;
74     ec->G.y[1] = 0xcbb64068;
75     ec->G.y[0] = 0x37bf51f5;
76   }
77 }
78