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      1 /******************************************************************************
      2  *
      3  *  Copyright 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 #pragma once
     25 
     26 #include "bt_types.h"
     27 
     28 #define DWORD_BITS 32
     29 #define DWORD_BYTES 4
     30 #define DWORD_BITS_SHIFT 5
     31 
     32 #define KEY_LENGTH_DWORDS_P192 6
     33 #define KEY_LENGTH_DWORDS_P256 8
     34 /* Arithmetic Operations */
     35 
     36 int multiprecision_compare(uint32_t* a, uint32_t* b, uint32_t keyLength);
     37 int multiprecision_iszero(uint32_t* a, uint32_t keyLength);
     38 void multiprecision_init(uint32_t* c, uint32_t keyLength);
     39 void multiprecision_copy(uint32_t* c, uint32_t* a, uint32_t keyLength);
     40 uint32_t multiprecision_dword_bits(uint32_t a);
     41 uint32_t multiprecision_most_signdwords(uint32_t* a, uint32_t keyLength);
     42 uint32_t multiprecision_most_signbits(uint32_t* a, uint32_t keyLength);
     43 void multiprecision_inv_mod(uint32_t* aminus, uint32_t* a, uint32_t keyLength);
     44 uint32_t multiprecision_add(uint32_t* c, uint32_t* a, uint32_t* b,
     45                             uint32_t keyLength);  // c=a+b
     46 void multiprecision_add_mod(uint32_t* c, uint32_t* a, uint32_t* b,
     47                             uint32_t keyLength);
     48 uint32_t multiprecision_sub(uint32_t* c, uint32_t* a, uint32_t* b,
     49                             uint32_t keyLength);  // c=a-b
     50 void multiprecision_sub_mod(uint32_t* c, uint32_t* a, uint32_t* b,
     51                             uint32_t keyLength);
     52 void multiprecision_rshift(uint32_t* c, uint32_t* a,
     53                            uint32_t keyLength);  // c=a>>1, return carrier
     54 void multiprecision_lshift_mod(uint32_t* c, uint32_t* a,
     55                                uint32_t keyLength);  // c=a<<b, return carrier
     56 uint32_t multiprecision_lshift(uint32_t* c, uint32_t* a,
     57                                uint32_t keyLength);  // c=a<<b, return carrier
     58 void multiprecision_mult(uint32_t* c, uint32_t* a, uint32_t* b,
     59                          uint32_t keyLength);  // c=a*b
     60 void multiprecision_mersenns_mult_mod(uint32_t* c, uint32_t* a, uint32_t* b,
     61                                       uint32_t keyLength);
     62 void multiprecision_mersenns_squa_mod(uint32_t* c, uint32_t* a,
     63                                       uint32_t keyLength);
     64 uint32_t multiprecision_lshift(uint32_t* c, uint32_t* a, uint32_t keyLength);
     65 void multiprecision_mult(uint32_t* c, uint32_t* a, uint32_t* b,
     66                          uint32_t keyLength);
     67 void multiprecision_fast_mod(uint32_t* c, uint32_t* a);
     68 void multiprecision_fast_mod_P256(uint32_t* c, uint32_t* a);
     69