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It was already close, but the carry loop would break early and
selecting which value to copy out was indexed on the borrow bit. Have
the carry loop run through, and add a const-time conditional copy
operation and use that to copy the output.
Convert ct_utils to CT namespace. Templatize the utils, which I was
hesitant to do initially but is pretty useful when dealing with
arbitrary word sizes.
Remove the poison macros, replace with inline funcs which reads
cleaner at the call site.
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via timing channels.
Add annotations for checking constant-time code using ctgrind to
PKCS #1 and OAEP, as well as IDEA and Curve25519 which were already
written as constant time code.
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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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