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Until now, every kex method has represented the output as an mp_int. So we were storing it in the mp_int field s->K, and adding it to the exchange hash and key derivation hashes via put_mp_ssh2. But there's now going to be the first kex method that represents the output as a string (so that it might have the top bit set, or multiple leading zero bytes, without its length varying). So we now need to be more general. The most general thing it's sensible to do is to replace s->K with a strbuf containing _already-encoded_ data to become part of the hash, including length fields if necessary. So every existing kex method still derives an mp_int, but then immediately puts it into that strbuf using put_mp_ssh2 and frees it.
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.