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2406b28e64
The codebase is filled with includes that are unused, and which thus can be removed. At the same time, the files often do not include all headers that contain the definitions used in those files. This change uses clang-format and clang-tidy to clean up the includes, with minor manual intervention to ensure the code compiles on all platforms.
95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef RIPPLE_CRYPTO_RANDOM_H_INCLUDED
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#define RIPPLE_CRYPTO_RANDOM_H_INCLUDED
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#include <mutex>
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namespace ripple {
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/** A cryptographically secure random number engine
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The engine is thread-safe (it uses a lock to serialize
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access) and will, automatically, mix in some randomness
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from std::random_device.
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Meets the requirements of UniformRandomNumberEngine
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*/
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class csprng_engine
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{
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private:
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std::mutex mutex_;
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public:
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using result_type = std::uint64_t;
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csprng_engine(csprng_engine const&) = delete;
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csprng_engine&
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operator=(csprng_engine const&) = delete;
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csprng_engine(csprng_engine&&) = delete;
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csprng_engine&
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operator=(csprng_engine&&) = delete;
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csprng_engine();
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~csprng_engine();
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/** Mix entropy into the pool */
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void
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mix_entropy(void* buffer = nullptr, std::size_t count = 0);
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/** Generate a random integer */
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result_type
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operator()();
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/** Fill a buffer with the requested amount of random data */
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void
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operator()(void* ptr, std::size_t count);
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/* The smallest possible value that can be returned */
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static constexpr result_type
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min()
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{
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return std::numeric_limits<result_type>::min();
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}
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/* The largest possible value that can be returned */
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static constexpr result_type
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max()
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{
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return std::numeric_limits<result_type>::max();
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}
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};
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/** The default cryptographically secure PRNG
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Use this when you need to generate random numbers or
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data that will be used for encryption or passed into
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cryptographic routines.
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This meets the requirements of UniformRandomNumberEngine
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*/
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csprng_engine&
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crypto_prng();
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} // namespace ripple
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#endif
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