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Pretty much useless and unused, except for listing the module names in
build.h and the short versions totally suffice for that.
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Contributed by Patrick Georgi
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the info.txt files with the right module dependencies.
Apply it across the codebase.
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and all CPU-specific implementations now depend on the appropriate engine
module.
The most common problem before with this was that the SSE2 module was built,
but the sole SSE2 code (SHA-1) was not (for instance, on an i686). This would
cause a compile warning about the unused request object.
Preventing unused engines from being built will also (very slightly) speed
up the lookup process on most system.
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the normal Botan base classes. This required making data members of
MD4, MD5, and Serpent protected rather than private, which is not very
good style IMO. On the other hand it allows for removing a bit of duplicated
code, and also has the nice effect that a pointer to a Serpent_IA32 can be
used right as a Serpent object, which makes sense anyway since they implement
the same algorithm. The C++ files in the *_ia32 modules are now simply hooks
between the virtual function call runtime and the assembly code.
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rather than silently replacing the C++ versions. Instead they are silently
replaced (currently, at least) at the lookup level: we switch off the set
of feature macros set to choose the best implementation in the current
build configuration. So you can have (and benchmark) MD5 and MD5_IA32
directly against each other in the same program with no hassles, but if
you ask for "MD5", you'll get maybe an MD5 or maybe MD5_IA32.
Also make the canonical asm names (which aren't guarded by C++ namespaces)
of the form botan_<algo>_<arch>_<func> as in botan_sha160_ia32_compress,
to avoid namespace collisions.
This change has another bonus that it should in many cases be possible to
derive the asm specializations directly from the original implementation,
saving some code (and of course logically SHA_160_IA32 is a SHA_160, just
one with a faster implementation of the compression function, so this seems
reasonable anyway).
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