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97 lines
2.7 KiB
C++
97 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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#include <string>
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#include <type_traits>
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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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