utatane.tea@gmail.com | 433040a | 2017-04-04 07:04:38 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Google Inc. |
| 3 | * Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com> |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY GOOGLE, INC. ``AS IS'' AND ANY |
| 15 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 17 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| 18 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 19 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 20 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 21 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| 22 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 24 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #pragma once |
| 28 | |
| 29 | #include <wtf/Noncopyable.h> |
| 30 | #include <wtf/StdLibExtras.h> |
| 31 | |
| 32 | namespace WTF { |
| 33 | |
| 34 | class RandomDevice { |
| 35 | WTF_MAKE_NONCOPYABLE(RandomDevice); |
ysuzuki@apple.com | 2a31ffc | 2019-08-12 20:57:15 +0000 | [diff] [blame] | 36 | WTF_MAKE_FAST_ALLOCATED; |
utatane.tea@gmail.com | 433040a | 2017-04-04 07:04:38 +0000 | [diff] [blame] | 37 | public: |
utatane.tea@gmail.com | db6bb43 | 2018-07-02 04:24:33 +0000 | [diff] [blame] | 38 | #if OS(DARWIN) || OS(FUCHSIA) || OS(WINDOWS) |
utatane.tea@gmail.com | 433040a | 2017-04-04 07:04:38 +0000 | [diff] [blame] | 39 | RandomDevice() = default; |
| 40 | #else |
| 41 | RandomDevice(); |
| 42 | ~RandomDevice(); |
| 43 | #endif |
| 44 | |
| 45 | // This function attempts to fill buffer with randomness from the operating |
| 46 | // system. Rather than calling this function directly, consider calling |
| 47 | // cryptographicallyRandomNumber or cryptographicallyRandomValues. |
| 48 | void cryptographicallyRandomValues(unsigned char* buffer, size_t length); |
| 49 | |
| 50 | private: |
abarth@webkit.org | 9f1101e | 2018-06-30 20:53:56 +0000 | [diff] [blame] | 51 | #if OS(DARWIN) || OS(FUCHSIA) || OS(WINDOWS) |
utatane.tea@gmail.com | 433040a | 2017-04-04 07:04:38 +0000 | [diff] [blame] | 52 | #elif OS(UNIX) |
| 53 | int m_fd { -1 }; |
| 54 | #else |
| 55 | #error "This configuration doesn't have a strong source of randomness." |
| 56 | // WARNING: When adding new sources of OS randomness, the randomness must |
| 57 | // be of cryptographic quality! |
| 58 | #endif |
| 59 | }; |
| 60 | |
| 61 | } |