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For block ciphers, stream ciphers, hashes, MACs, and cipher modes.
Cipher_Mode already had it, with a slightly different usage.
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Various algorithms had an optimized implementation (for SSE2, AVX2, etc)
which was offered alongside the 'base' implementation. This is
admittedly very useful for testing, but it breaks user expectations in
bad ways. See GH #477 for background.
Now encrypting with `AES_128` (say) just runs whatever implementation
is best on the current processor/build.
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The support problems from having static libraries not work in the
obvious way will be endless trouble. Instead have each set of
registrations tag along in a source file for the basic type, at the
cost of some extra ifdefs. On shared libs this is harmless -
everything is going into the shared object anyway. With static libs,
this means pulling in a single block cipher pulls in the text of all
the them. But that's still strictly better than the amalgamation
(which is really pulling in everything), and it works (unlike status quo).
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Transforms and BlockCiphers. Registration for all types is done at
startup but is very cheap as just a std::function and a std::map entry
are created, no actual objects are created until needed. This is a
huge improvement over Algorithm_Factory which used T::clone() as the
function and thus kept a prototype object of each type in memory.
Replace existing lookup mechanisms for ciphers, AEADs, and compression
to use the transform lookup. The existing Engine framework remains in
place for BlockCipher, but the engines now just call to the registry
instead of having hardcoded lookups.
s/Transformation/Transform/ with typedefs for compatability.
Remove lib/selftest code (for runtime selftesting): not the right approach.
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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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