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Note: blinding is not currently being used for RSA, RW, DH or ElGamal,
which used to have them. This should be added back before release.
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performed. Up until now, each key object (eg DSA_PublicKey or
ECDH_PrivateKey) had two jobs: contain the key material, and know how
to perform any operations on that key. However because of a desire to
support alternative implementations (GNU MP, hardware, whatever),
there was a notion of operations, with the key objects containing an
op that they got via engine rather than actually implementing the
underlying algorithms directly.
Now, represent the operation as an abstract interface (typically
mapping a byte string to a byte string), and pass a plain Public_Key&
or Private_Key& to the engine. The engine does any checks it wants (eg
based on name, typeid, key sizes, etc), and either returns nothing
(I'll pass) or a pointer to a new operation that represents signatures
or encryption or what-have-you using that key.
This means that plain key objects no longer contain operations. This
is a major break with the traditional interface. On the other hand,
using these 'bare' operations without padding, KDFs, etc is 99% of the
time a bad idea anyway (and if you really need them, there are options
so you get the bare op but via the pubkey.h interfaces).
Currently this change is only implemented for DH and ECDH (ie, key
agreement algorithms). Additionally the optional engines (gnump and
openssl) have not been updated. I'll probably wait to touch those
until after I can change them all in one go for all algos.
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Move most of the engine headers to internal
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up during the Fedora submission review, that each source file include some
text about the license. One handy Perl script later and each file now has
the line
Distributed under the terms of the Botan license
after the copyright notices.
While I was in there modifying every file anyway, I also stripped out the
remainder of the block comments (lots of astericks before and after the
text); this is stylistic thing I picked up when I was first learning C++
but in retrospect it is not a good style as the structure makes it harder
to modify comments (with the result that comments become fewer, shorter and
are less likely to be updated, which are not good things).
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algo_factory and algorithm_factory. This is confusing
so for consistency/simplicity, remove algo_factory, making
algorithm_factory the function to call.
In 1.7.14, several functions in lookup.h, including
retrieve_block_cipher, retrieve_hash, etc were changed to accept
a Library_State& reference. However it turns out with the
modified design I've settled upon for 1.8 that it is not
necessary to change those interfaces; instead they always refer
to the global_state algorithm factory which is exactly the
semantics one would expect/desire 99% of the time (and is source
compatible with code written for 1.6, also a plus)
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back to the toplevel since most othe dependencies have been removed now
(except get_cipher which still needs changes)
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