Line data    Source code

       1              : /*
       2              :  *
       3              :  *    Copyright (c) 2020 Project CHIP Authors
       4              :  *    Copyright (c) 2013-2017 Nest Labs, Inc.
       5              :  *
       6              :  *    Licensed under the Apache License, Version 2.0 (the "License");
       7              :  *    you may not use this file except in compliance with the License.
       8              :  *    You may obtain a copy of the License at
       9              :  *
      10              :  *        http://www.apache.org/licenses/LICENSE-2.0
      11              :  *
      12              :  *    Unless required by applicable law or agreed to in writing, software
      13              :  *    distributed under the License is distributed on an "AS IS" BASIS,
      14              :  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      15              :  *    See the License for the specific language governing permissions and
      16              :  *    limitations under the License.
      17              :  */
      18              : 
      19              : /**
      20              :  *    @file
      21              :  *      This file implements utility functions for deriving random integers.
      22              :  *
      23              :  *  @note These utility functions do not generate cryptographically strong
      24              :  *        random number. To get cryptographically strong random data use
      25              :  *        chip::Crypto::DRBG_get_bytes().
      26              :  *
      27              :  */
      28              : 
      29              : #include "RandUtils.h"
      30              : 
      31              : #include <stdint.h>
      32              : #include <stdlib.h>
      33              : 
      34              : #include <crypto/CHIPCryptoPAL.h>
      35              : #include <lib/support/CodeUtils.h>
      36              : 
      37              : namespace chip {
      38              : namespace Crypto {
      39              : 
      40           47 : uint64_t GetRandU64()
      41              : {
      42           47 :     uint64_t tmp = 0;
      43           47 :     VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(reinterpret_cast<uint8_t *>(&tmp), sizeof(tmp)));
      44           47 :     return tmp;
      45              : }
      46              : 
      47       136355 : uint32_t GetRandU32()
      48              : {
      49       136355 :     uint32_t tmp = 0;
      50       136355 :     VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(reinterpret_cast<uint8_t *>(&tmp), sizeof(tmp)));
      51       136355 :     return tmp;
      52              : }
      53              : 
      54          729 : uint16_t GetRandU16()
      55              : {
      56          729 :     uint16_t tmp = 0;
      57          729 :     VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(reinterpret_cast<uint8_t *>(&tmp), sizeof(tmp)));
      58          729 :     return tmp;
      59              : }
      60              : 
      61         8228 : uint8_t GetRandU8()
      62              : {
      63         8228 :     uint8_t tmp = 0;
      64         8228 :     VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(&tmp, sizeof(tmp)));
      65         8228 :     return tmp;
      66              : }
      67              : 
      68              : } // namespace Crypto
      69              : } // namespace chip