android10/system/bt/stack/smp/p_256_multprecision.h

/******************************************************************************
 *
 *  Copyright 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
 *
 ******************************************************************************/
#pragma once

#include "bt_types.h"

#define DWORD_BITS 32
#define DWORD_BYTES 4
#define DWORD_BITS_SHIFT 5

#define KEY_LENGTH_DWORDS_P192 6
#define KEY_LENGTH_DWORDS_P256 8
/* Arithmetic Operations */

int multiprecision_compare(uint32_t* a, uint32_t* b, uint32_t keyLength);
int multiprecision_iszero(uint32_t* a, uint32_t keyLength);
void multiprecision_init(uint32_t* c, uint32_t keyLength);
void multiprecision_copy(uint32_t* c, uint32_t* a, uint32_t keyLength);
uint32_t multiprecision_dword_bits(uint32_t a);
uint32_t multiprecision_most_signdwords(uint32_t* a, uint32_t keyLength);
uint32_t multiprecision_most_signbits(uint32_t* a, uint32_t keyLength);
void multiprecision_inv_mod(uint32_t* aminus, uint32_t* a, uint32_t keyLength);
uint32_t multiprecision_add(uint32_t* c, uint32_t* a, uint32_t* b,
                            uint32_t keyLength);  // c=a+b
void multiprecision_add_mod(uint32_t* c, uint32_t* a, uint32_t* b,
                            uint32_t keyLength);
uint32_t multiprecision_sub(uint32_t* c, uint32_t* a, uint32_t* b,
                            uint32_t keyLength);  // c=a-b
void multiprecision_sub_mod(uint32_t* c, uint32_t* a, uint32_t* b,
                            uint32_t keyLength);
void multiprecision_rshift(uint32_t* c, uint32_t* a,
                           uint32_t keyLength);  // c=a>>1, return carrier
void multiprecision_lshift_mod(uint32_t* c, uint32_t* a,
                               uint32_t keyLength);  // c=a<<b, return carrier
uint32_t multiprecision_lshift(uint32_t* c, uint32_t* a,
                               uint32_t keyLength);  // c=a<<b, return carrier
void multiprecision_mult(uint32_t* c, uint32_t* a, uint32_t* b,
                         uint32_t keyLength);  // c=a*b
void multiprecision_mersenns_mult_mod(uint32_t* c, uint32_t* a, uint32_t* b,
                                      uint32_t keyLength);
void multiprecision_mersenns_squa_mod(uint32_t* c, uint32_t* a,
                                      uint32_t keyLength);
uint32_t multiprecision_lshift(uint32_t* c, uint32_t* a, uint32_t keyLength);
void multiprecision_mult(uint32_t* c, uint32_t* a, uint32_t* b,
                         uint32_t keyLength);
void multiprecision_fast_mod(uint32_t* c, uint32_t* a);
void multiprecision_fast_mod_P256(uint32_t* c, uint32_t* a);