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The plain PointGFp operator* now uses Montgomery ladder exclusively.
Adds a blinded point multiply algorithm which uses exponent and point
randomization, as well as a Montgomery ladder technique that takes a
random walk of the possible addition chains for k.
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as was previously done with encrypt/decrypt ops.
One feature dropped on the floor here is previously PK_Signer by
default did verification of signatures before releasing them as an
measure against fault attacks. However in addition to being expensive
this turned out to be difficult to implement with the new scheme.
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Convert all uses of Algorithm_Factory and the engines to using Algo_Registry
The shared pool of entropy sources remains but is moved to EntropySource.
With that and few remaining initializations (default OIDs and aliases)
moved elsewhere, the global state is empty and init and shutdown are no-ops.
Remove almost all of the headers and code for handling the global
state, except LibraryInitializer which remains as a compatability stub.
Update seeding for blinding so only one hacky almost-global RNG
instance needs to be setup instead of across all pubkey uses (it uses
either the system RNG or an AutoSeeded_RNG if the system RNG is not
available).
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Remove global PRNG.
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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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