| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #define LOG_TAG "keystore" |
| |
| #include "entropy.h" |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <cutils/log.h> |
| |
| #include "keystore_utils.h" |
| |
| Entropy::~Entropy() { |
| if (mRandom >= 0) { |
| close(mRandom); |
| } |
| } |
| |
| bool Entropy::open() { |
| const char* randomDevice = "/dev/urandom"; |
| mRandom = TEMP_FAILURE_RETRY(::open(randomDevice, O_RDONLY)); |
| if (mRandom < 0) { |
| ALOGE("open: %s: %s", randomDevice, strerror(errno)); |
| return false; |
| } |
| return true; |
| } |
| |
| bool Entropy::generate_random_data(uint8_t* data, size_t size) const { |
| return (readFully(mRandom, data, size) == size); |
| } |