Currently, process_final_incomplete_block() will perform the round
R calculation with the remaining data, then finalize CubeHash. It
is not possible to finalize CubeHash if there's no incomplete block.
Here, we define the call of process_final_incomplete_block(NULL, 0)
as a way to directly finalize CubeHash when input is a multiple of
block size and there is no remaining data for round R.
Also, in this case, any call of process_final_incomplete_block(),
but only with a single NULL pointer, or only with n == 0, is an
indication of bug. We assert both to be zero/nonzero.
Signed-off-by: Tom Li <tomli@tomli.me>
In load_key_vector(), the program passes a std::vector<byte> to
a C-style function, load_key (const byte*begin, const byte*end)
by creating references
load_key (& (K[0]), & (K[K.size()]));
However, accessing the one-past-the-last element in a std::vector
via [] is not allowed in C++, it triggers an assertion failure.
Assertion '__builtin_expect(__n < this->size(), true)' failed.
In this commit, we use K.data() and K.data() + K.size() to expose
the underlying pointers and pass them to the C function.
Signed-off-by: Tom Li <tomli@tomli.me>
Note that the CMakeLists.txt file is not included in autotools dist package to
avoid any packaging confusion. `configure.ac` is still the primary
build-configuration information source. (Btw isn't there a way to build
CMakeLists.txt from autotools?)
Well, there's a reason for that test vectors are published on wikipedia.
Although this looks scary (like writing past array bounds), cubehash B
parameter is in all cases smaller than 63 (which is the first B value where
this would write behind the array), so no harm is done. For similar reason, the
"misimplemented" cubehash was cryptographically correct (i.e. without
cryptographic weakness), only implemented differently and producing different
results than those prescribed by the standard.
Practical implications of changing the hash functions are:
- everyone gets a new KeyID
- FMTSeq keys that used cubehash are invalid now, users are forced to generate
new ones