stack/smp/p_256_curvepara.cc

/******************************************************************************
 *
 *  Copyright (C) 2006-2015 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

/*******************************************************************************
 *
 *  This file contains simple pairing algorithms
 *
 ******************************************************************************/

#include <string.h>
#include "p_256_ecc_pp.h"

void p_256_init_curve(uint32_t keyLength) {
  elliptic_curve_t* ec;

  if (keyLength == KEY_LENGTH_DWORDS_P256) {
    ec = &curve_p256;

    ec->p[7] = 0xFFFFFFFF;
    ec->p[6] = 0x00000001;
    ec->p[5] = 0x0;
    ec->p[4] = 0x0;
    ec->p[3] = 0x0;
    ec->p[2] = 0xFFFFFFFF;
    ec->p[1] = 0xFFFFFFFF;
    ec->p[0] = 0xFFFFFFFF;

    memset(ec->omega, 0, KEY_LENGTH_DWORDS_P256);
    memset(ec->a, 0, KEY_LENGTH_DWORDS_P256);

    ec->a_minus3 = true;

    // b
    ec->b[7] = 0x5ac635d8;
    ec->b[6] = 0xaa3a93e7;
    ec->b[5] = 0xb3ebbd55;
    ec->b[4] = 0x769886bc;
    ec->b[3] = 0x651d06b0;
    ec->b[2] = 0xcc53b0f6;
    ec->b[1] = 0x3bce3c3e;
    ec->b[0] = 0x27d2604b;

    // base point
    ec->G.x[7] = 0x6b17d1f2;
    ec->G.x[6] = 0xe12c4247;
    ec->G.x[5] = 0xf8bce6e5;
    ec->G.x[4] = 0x63a440f2;
    ec->G.x[3] = 0x77037d81;
    ec->G.x[2] = 0x2deb33a0;
    ec->G.x[1] = 0xf4a13945;
    ec->G.x[0] = 0xd898c296;

    ec->G.y[7] = 0x4fe342e2;
    ec->G.y[6] = 0xfe1a7f9b;
    ec->G.y[5] = 0x8ee7eb4a;
    ec->G.y[4] = 0x7c0f9e16;
    ec->G.y[3] = 0x2bce3357;
    ec->G.y[2] = 0x6b315ece;
    ec->G.y[1] = 0xcbb64068;
    ec->G.y[0] = 0x37bf51f5;
  }
}