| Commit message (Collapse) | Author | Age | Files | Lines |
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Add OS functions get_process_id, get_processor_timestamp, and
get_system_timestamp_ns. HMAC_RNG uses the pid call to detect forks to
initiate a reseed. It also adds the output of all three functions (the
pid, the CPU cycle counter, and the system timestamp) into the PRF input.
Calls the new OS timer functions from hres_timer entropy source.
Removes the call to QPC in es_win32 which is mostly redundant with the
one in hres_timer.
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Thinking it over I've realized this was not a good move; XP may be EOLed but is
still widely used and even VS 2015 still supports targeting XP. It's not really
the same situation as going to extra efforts for supporting SunOS 5.1 or VAX/VMS,
instead it actively broke support for something which is still widely deployed.
And for those building for XP the options are patch out the call (GH #416) or
disable win32_stats altogether in their build. I'd like to prevent downstream
distributors from having to patch, because that can get messy. And while the
design of CryptGenRandom is not disclosed it apparently has changed over time
and at one point (IIRC) used RC4 to generate outputs, so if there is any OS that
could use some extra help generating seed material it is XP.
There may be future code that really makes use of APIs added after XP - CryptoNG,
TPM support, etc and then people targetting XP will have to compile out those
modules. But it doesn't make sense to break it here for this small gain.
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By adopting MemoryStatusEx, this drops support for XP and Server 2003
which do not implement this API. This is considered a feature as these
versions are already EOLed by Microsoft.
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* GetTickCount is replaced by GetTickCount64(): see https://msdn.microsoft.com/en-us/library/windows/desktop/ms724408(v=vs.85).aspx for details
* GlobalMemoryStatus is replaced by GlobalMemoryStatusEx: see https://msdn.microsoft.com/en-us/library/windows/desktop/aa366589(v=vs.85).aspx for details
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In some cases this can offer better optimization, via devirtualization.
And it lets the user know the class is not intended for derivation.
Some discussion in GH #402
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Defaults should be fine for everyone but it makes the values more transparent
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Provides an easier way for an application to configure a list of
entropy sources they'd like to use, or add a custom entropy source to
their seeding.
Exposes some toggles for the global/default entropy sources to build.h
Adds basic entropy tests which runs the polls and does sanity checking
on the results, including compression tests if available. These are
less useful for the CSPRNG outputs but a good check for the ones
producing plain ASCII like the /proc reader.
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Instead each source that needs a buffer maintains their own.
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Update license header line to specify the terms and refer to the file,
neither of which it included before.
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