mirror of
https://github.com/openharmony/device_manager.git
synced 2026-07-19 18:13:32 -04:00
@shi-xiaoxiao-iris
117 lines
3.4 KiB
C++
117 lines
3.4 KiB
C++
/*
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* Copyright (c) 2022 Huawei Device Co., Ltd.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dm_random.h"
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#include <random>
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#include "dm_constants.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/entropy.h"
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#if defined(__LITEOS_M__)
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#include <time.h>
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#endif
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namespace OHOS {
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namespace DistributedHardware {
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int32_t GenRandInt(int32_t randMin, int32_t randMax)
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{
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#if defined(__LITEOS_M__)
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srandom(time(NULL));
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return (randMin + random() % (randMax - randMin));
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#else
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std::random_device randDevice;
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std::mt19937 genRand(randDevice());
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std::uniform_int_distribution<int> disRand(randMin, randMax);
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return disRand(genRand);
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#endif
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}
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int64_t GenRandLongLong(int64_t randMin, int64_t randMax)
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{
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std::random_device randDevice;
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std::mt19937 genRand(randDevice());
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std::uniform_int_distribution<long long> disRand(randMin, randMax);
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return disRand(genRand);
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}
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int32_t GetRandomData(uint8_t *randStr, uint32_t len)
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{
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mbedtls_entropy_context *entropy = nullptr;
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mbedtls_ctr_drbg_context *ctrDrbg = nullptr;
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int32_t ret = ERR_DM_FAILED;
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do {
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if (randStr == nullptr || len == 0) {
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break;
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}
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entropy = (mbedtls_entropy_context *)malloc(sizeof(mbedtls_entropy_context));
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if (entropy == nullptr) {
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break;
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}
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ctrDrbg = (mbedtls_ctr_drbg_context *)malloc(sizeof(mbedtls_ctr_drbg_context));
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if (ctrDrbg == nullptr) {
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break;
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}
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mbedtls_ctr_drbg_init(ctrDrbg);
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mbedtls_entropy_init(entropy);
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ret = mbedtls_ctr_drbg_seed(ctrDrbg, mbedtls_entropy_func, entropy, nullptr, 0);
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if (ret != 0) {
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break;
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}
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ret = mbedtls_ctr_drbg_random(ctrDrbg, randStr, len);
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if (ret != 0) {
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break;
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}
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ret = DM_OK;
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} while (false);
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if (entropy != nullptr) {
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free(entropy);
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}
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if (ctrDrbg != nullptr) {
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free(ctrDrbg);
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}
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return ret;
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}
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bool MbedtlsGenRandomStr(char *szOut, int32_t szOutLen, bool numberOnly)
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{
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const int32_t MIN_OUT_LENGTH = 2;
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if (szOut == nullptr || szOutLen <= MIN_OUT_LENGTH) {
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return false;
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}
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szOut[--szOutLen] = 0;
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GetRandomData((uint8_t *)szOut, (uint32_t)szOutLen);
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const int32_t NUMBER_COUNT = 10;
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const int32_t ALPHA_COUNT = 26;
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const int32_t ALPHA_BYTE_COUNT = 2;
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int32_t tmpNum = numberOnly ? NUMBER_COUNT : (NUMBER_COUNT + ALPHA_BYTE_COUNT * ALPHA_COUNT);
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for (int32_t i = 0; i < szOutLen; i++) {
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uint32_t idx = ((uint32_t)szOut[i] % tmpNum);
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char base;
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if (idx < NUMBER_COUNT) {
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base = '0';
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} else if (idx >= NUMBER_COUNT && idx < (NUMBER_COUNT + ALPHA_COUNT)) {
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base = 'A';
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idx -= NUMBER_COUNT;
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} else {
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base = 'a';
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idx -= (NUMBER_COUNT + ALPHA_COUNT);
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}
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szOut[i] = base + idx;
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}
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return true;
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}
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} // namespace DistributedHardware
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} // namespace OHOS
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