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Ticket Resolution Summary Owner Reporter
#160 wontfix ssh key failures: "Input strings must be a multiple of 8 in length" Antoine Martin Antoine Martin

This happens on some distributions that ship old versions of Python-Twisted (older than 10.x?) - the user will not be able to use their SSH key with Window Switch because of this.

This causes stacktraces like this one:

[II] 2011/08/09 17:41:05 ConchUserAuth.ok(################,False)
[EE] 2011/08/09 17:41:05 ConchUserAuth.ok((...),False) cannot load private key
[ee] 2011/08/09 17:41:05 Traceback (most recent call last):
[ee] 2011/08/09 17:41:05   File "/usr/lib/pymodules/python2.6/winswitch/net/", line 228, in ok
[ee] 2011/08/09 17:41:05     key = privateKeyFromFile(self.factory.private_key, new_passphrase)
[ee] 2011/08/09 17:41:05   File "/usr/lib/pymodules/python2.6/winswitch/net/", line 207, in privateKeyFromFile
[ee] 2011/08/09 17:41:05     return     keys.Key.fromFile(filename, passphrase=passphrase).keyObject
[ee] 2011/08/09 17:41:05   File "/usr/lib/python2.6/dist-packages/twisted/conch/ssh/", line 62, in fromFile
[ee] 2011/08/09 17:41:05     return Class.fromString(file(filename, 'rb').read(), type, passphrase)
[ee] 2011/08/09 17:41:05   File "/usr/lib/python2.6/dist-packages/twisted/conch/ssh/", line 90, in fromString
[ee] 2011/08/09 17:41:05     return method(data, passphrase)
[ee] 2011/08/09 17:41:05   File "/usr/lib/python2.6/dist-packages/twisted/conch/ssh/", line 216, in _fromString_PRIVATE_OPENSSH
[ee] 2011/08/09 17:41:05     keyData =, DES3.MODE_CBC, iv).decrypt(b64Data)
[ee] 2011/08/09 17:41:05 ValueError: Input strings must be a multiple of 8 in length

It will occur more often now that distros are using the AES-128 cypher when generating SSH keys.

This bug is here just as a reminder that there is absolutely nothing we can do about this: it is the distribution's responsibility to fix their buggy libraries. Once again, Ubuntu is shipping buggy versions in its "stable" release... sigh

More info at and their ticket

#154 fixed spurious characters with xpra Antoine Martin FredSRichardson

I'm using the latest version on both the client and server:


I notice that when I use certain emacs commands like "C-X 1" or "C-X 0" a sequence of "1" or "0" will get pasted at the current point in the buffer.

The server is ubuntu-64 (lucid) and the client is ubuntu-32 (lucid VM under Windows 7).



#88 fixed sound support: use gstreamer+pulseaudio to provide efficient sound in/out over network Antoine Martin Antoine Martin

What we have there kinda works, but there are many issues that need improving/resolving:

  • bandwidth: pulseaudio's TCP protocol is a bandwidth pig... We must ensure we only use it over fast links (need better detection?)

Edit: see original description for the approach that was abandoned (pure pulseaudio)

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