surtur
0c2a1c6744
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commit a64b52e5a4e71785598322991688f8720e0f1693
Author: surtur <a_mirre@utb.cz>
Date: Sun Nov 21 23:39:30 2021 +0100
finalise generator
this commit adds a (nearly) complete implementation of the generator.
* wrap calls to generator in a fortuna class method random_data
* calls generator's method generate_random_data, that internally calls
generate_blocks
* use a proper 256bit key in G_state
* add reseed method implementation
* call a reseed in initialize_generator
* do_sha returns proper digest now
* add proper do_crypto implementation
* call generate_blocks internally
* handle re-keying
* optimise header includes
TODO: there are still many commented (enabled on demand) debugging statements
-> TO BE REMOVED
50 lines
1.0 KiB
C++
50 lines
1.0 KiB
C++
#ifndef FORTUNA_GENERATOR_H
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#define FORTUNA_GENERATOR_H
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#include <cryptopp/cryptlib.h>
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#include <cryptopp/secblock.h>
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#include <string>
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namespace fortuna {
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namespace generator {
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class Generator {
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public:
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Generator(); // ad noexcept: perhaps _do_ throw*
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~Generator();
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/* n is the number of random bytes to generate */
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auto generate_random_data(uint n) -> std::string;
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private:
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struct G_state {
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// 32*8
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static constexpr const std::size_t k_length{32};
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CryptoPP::FixedSizeSecBlock<CryptoPP::byte, k_length> k;
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wpedantic"
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unsigned __int128 ctr;
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#pragma GCC diagnostic pop
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};
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G_state G;
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void initialize_generator();
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auto reseed(const std::string& s) -> void;
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auto do_sha(const std::string& k_n_s) -> std::string;
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auto do_crypto() -> std::string;
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auto generate_blocks(unsigned int k_blocks) -> std::string;
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protected:
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auto get_state() -> Generator::G_state;
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}; // class generator
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} //namespace generator
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} //namespace fortuna
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#endif//FORTUNA_GENERATOR_H
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