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Large block size makes the differential test fragile.
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This interface changed, and it seems the test was only partially updated.
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Remove Entropy_Accumulator, instead have entropy sources directly
add entropy to the RNG.
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With sufficient squinting, Transform provided an abstract base
interface that covered both cipher modes and compression algorithms.
However it mapped on neither of them particularly well. In addition
this API had the same problem that has made me dislike the Pipe/Filter
API: given a Transform&, what does it do when you put bits in? Maybe
it encrypts. Maybe it compresses. It's a floor wax and a dessert topping!
Currently the Cipher_Mode interface is left mostly unchanged, with the
APIs previously on Transform just moved down the type hierarchy. I
think there are some definite improvements possible here, wrt handling
of in-place encryption, but left for a later commit.
The compression API is split into two types, Compression_Algorithm and
Decompression_Algorithm. Compression_Algorithm's start() call takes
the compression level, allowing varying compressions with a single
object. And flushing the compression state is moved to a bool param on
`Compression_Algorithm::update`. All the nonsense WRT compression
algorithms having zero length nonces, input granularity rules, etc
as a result of using the Transform interface goes away.
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Cast std::streamsize to size_t since MSVC is worried gcount() might
return a negative number.
The entropy callbacks took the entropy estimate as a size_t instead of
a double, which causes some verbose warnings due to the conversion.
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Feels kind of nasty, but it sucks more to have CI builds break because
of random failures.
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Missed because Travis uses zlib and company even in the min build.
GH #337
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Change getrusage output to static system data since it is sparse and
changes rarely, and so actually does trigger the differential test.
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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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