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I heard recently that at least one third-party client of Pageant exists, and that it's used to generate signatures to use with TLS client certificates. Apparently the signature scheme is compatible, but TLS tends to need signatures over more data than will fit in AGENT_MAX_MSGLEN. Before the BinarySink refactor in commit b6cbad89f, this was OK because the Windows Pageant IPC didn't check the size of the _input_ message against AGENT_MAX_MSGLEN, only the output one. But then we started checking both, so that third-party TLS client started failing. Now we use VirtualQuery to find out the actual size of the file mapping we've been passed, and our only requirement is that the input and output messages should both fit in _that_. So TLS should work again, and also, other clients should be able to retrieve longer lists of public keys if they pass a larger file mapping. One side effect of this change is that Pageant's reply message is now written directly into the shared-memory region. Previously, it was written into a separate buffer and then memcpy()ed over after pageant_handle_msg returned, but now the buffer is variable-size, it seems to me to make more sense to avoid that extra not-entirely controlled malloc. So I've done one very small reordering of statements in the cross-platform pageant_handle_msg(), which fixes the only case I could find where that function started writing its output before it had finished using the contents of the input buffer.
PuTTY README
============
This is the README file for the PuTTY installer distribution. If
you're reading this, you've probably just run our installer and
installed PuTTY on your system.
What should I do next?
----------------------
If you want to use PuTTY to connect to other computers, or use PSFTP
to transfer files, you should just be able to run them from the
Start menu.
If you want to use the command-line-only file transfer utility PSCP,
you will probably want to put the PuTTY installation directory on
your PATH. On Windows 7 and similar versions, you can do this at
Control Panel > System and Security > System > Advanced system
settings > Environment Variables.
Some versions of Windows will refuse to run HTML Help files (.CHM)
if they are installed on a network drive. If you have installed
PuTTY on a network drive, you might want to check that the help file
works properly. If not, see http://support.microsoft.com/kb/896054
for information on how to solve this problem.
What do I do if it doesn't work?
--------------------------------
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
Here you will find our list of known bugs and pending feature
requests. If your problem is not listed in there, or in the FAQ, or
in the manuals, read the Feedback page to find out how to report
bugs to us. PLEASE read the Feedback page carefully: it is there to
save you time as well as us. Do not send us one-line bug reports
telling us `it doesn't work'.