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          32 : uint64_t GetRandU64()
      41             : {
      42          32 :     uint64_t tmp = 0;
      43          32 :     VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(reinterpret_cast<uint8_t *>(&tmp), sizeof(tmp)));
      44          32 :     return tmp;
      45             : }
      46             : 
      47      136098 : uint32_t GetRandU32()
      48             : {
      49      136098 :     uint32_t tmp = 0;
      50      136098 :     VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(reinterpret_cast<uint8_t *>(&tmp), sizeof(tmp)));
      51      136098 :     return tmp;
      52             : }
      53             : 
      54         656 : uint16_t GetRandU16()
      55             : {
      56         656 :     uint16_t tmp = 0;
      57         656 :     VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(reinterpret_cast<uint8_t *>(&tmp), sizeof(tmp)));
      58         656 :     return tmp;
      59             : }
      60             : 
      61        8023 : uint8_t GetRandU8()
      62             : {
      63        8023 :     uint8_t tmp = 0;
      64        8023 :     VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(&tmp, sizeof(tmp)));
      65        8023 :     return tmp;
      66             : }
      67             : 
      68             : } // namespace Crypto
      69             : } // namespace chip