/*

 *

 *    Copyright (c) 2020 Project CHIP Authors

 *    Copyright (c) 2013-2017 Nest Labs, Inc.

 *

 *    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.

 */

/**

 *    @file

 *      This file implements utility functions for deriving random integers.

 *

 *  @note These utility functions do not generate cryptographically strong

 *        random number. To get cryptographically strong random data use

 *        chip::Crypto::DRBG_get_bytes().

 *

 */

#include "RandUtils.h"

#include <stdint.h>

#include <stdlib.h>

#include <crypto/CHIPCryptoPAL.h>

#include <lib/support/CodeUtils.h>

namespace chip {

namespace Crypto {

uint64_t GetRandU64()

{

    uint64_t tmp = 0;

    VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(reinterpret_cast<uint8_t *>(&tmp), sizeof(tmp)));

    return tmp;

}

uint32_t GetRandU32()

{

    uint32_t tmp = 0;

    VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(reinterpret_cast<uint8_t *>(&tmp), sizeof(tmp)));

    return tmp;

}

uint16_t GetRandU16()

{

    uint16_t tmp = 0;

    VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(reinterpret_cast<uint8_t *>(&tmp), sizeof(tmp)));

    return tmp;

}

uint8_t GetRandU8()

{

    uint8_t tmp = 0;

    VerifyOrDie(CHIP_NO_ERROR == DRBG_get_bytes(&tmp, sizeof(tmp)));

    return tmp;

}

} // namespace Crypto

} // namespace chip