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73 lines
1.6 KiB
C++
73 lines
1.6 KiB
C++
#pragma once
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#include <mutex>
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namespace xrpl {
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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 CsprngEngine
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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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CsprngEngine(CsprngEngine const&) = delete;
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CsprngEngine&
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operator=(CsprngEngine const&) = delete;
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CsprngEngine(CsprngEngine&&) = delete;
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CsprngEngine&
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operator=(CsprngEngine&&) = delete;
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CsprngEngine();
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~CsprngEngine();
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/** Mix entropy into the pool */
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void
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mixEntropy(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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CsprngEngine&
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cryptoPrng();
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} // namespace xrpl
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