* move reseed_ctr and related member functions to Accumulator
* create a std::shared_ptr<Accumulator> to Fortuna's internal
Accumulator object and feed that into SeedFileManager instead of a
reference, which used to get copied to a new object in SeedFileManager
* make Accumulator non-copyable, since it's only to be created once.
instead, a shared_ptr is used to facilitate multiple-access
* handle concurrency in Accumulator as the reseed_ctr-related functions
can now be accessed from both Fortuna and SeedFileManager, declare mtx
as mutable (since it's also used in a const function)
* use std::scoped_lock in 'initialize_prng()' to safely lock both mutexes
general
* make greater use of "this"
Fortuna
* declare da_pools as a proper std::array of 32 Pool objects
* declare da_pools as const
* use std::shared_ptr _p_pools to access da_pools and share access to
it
* reflect change of pools[] -> std::array in how the array elements
are accessed, which is a) via _p_pools pointer and b) using ".at(i)"
function
* pass _p_pools shared_ptr to Accumulator
* refactor member function names and variable names
* add member function attribute [[optimize_for_synchronized]]
* secure conversions with static_cast-s
Accumulator
* make use of _p_pools
* add _p_pools-related member functions
* add a static constexpr variable NUM_OF_POOLS
UrandomEntropySrc
* implement event adding logic using _p_pools
* make std::vector<char> non-static in urandom_entropy_src
* implement proper urandom entropy source event "sourcing" (from
/dev/urandom), event adding, clear bytes array at the end
* properly convert using reinterpret_cast
* protect access to the main function with std::lock_guard
* receive EventAdderImpl as a ref
* use return value from "add_entropy()" member function and create
sanity guard checking the return code "int ret"
EventAdder
* pass event (std::vector<char>) by const&
EventAdderImpl
* make use of _p_pools shared_ptr
* implement proper pool-rotating event-adding logic
Pool
* delete all copy constructors and assignment operator, the objects
will not be copied or assigned to
* receive parameters by const& where possible/sensible
* handle concurrency:
* declare std:string s as mutable
* declare a rw std::mutex intended for writing and mutable
std::recursive_mutex for read-only operations in const member
functions
ref: https://herbsutter.com/2013/05/24/gotw-6a-const-correctness-part-1-3/
ref: https://arne-mertz.de/2017/10/mutable/
* use std::lock_guard and std::unique_lock
* refactor "add_entropy()" member function
* get rid of intermediate "event_str" and directly use the "event"
std::vector<char> for all operations
* add a lock guard to prevent multiple threads (should that route be
taken) from modifying pool resources simultaneously
* add all_ok bool for basic sanity checking
* add print statements (at least for now)
* rename "get_s_length()" member function to "get_s_byte_count()" and
repurpose it to return byte count of the stored entropy std::string s
* handle the PRNG state with R_state nested class
* add a private property R holding PRNG state to Fortuna
* add R_state properties as defined in Cryptography Engineering:
* a generator instance
* a reseed counter
* 32 pools that the collected entropy is to be distributed over
* add initial definition of the Pool object and its initialization
* attempt to initialize PRNG in Fortuna constructor. wrap the
initialization call in a try-catch block like a cultured person
* erase the string used to print data from random_data() after it's been
used
