[pycrypto] DES/DES3/XOR/etc removal

Tzury Bar Yochay tzury.by at reguluslabs.com
Wed Apr 22 11:55:47 CST 2009

please keep the DES3 and XOR.
we use them and need them in our ongoing projects

On Wed, Apr 22, 2009 at 8:23 PM, Jean-Paul Calderone <
exarkun at twistedmatrix.com> wrote:

> Hello,
> Someone pointed out that XOR and several other ciphers [1] have been
> removed from PyCrypto.  This has the consequence that Twisted Conch,
> and SSH client and server implementation which depends on PyCrypto,
> no longer works with the latest development version of PyCrypto, and
> I assume that when the next release of PyCrypto is made, Conch also
> won't work with that.
> I'm curious how important backwards compatibility is deemed with the
> new PyCrypto development going on.  A change like the one referenced
> above is going to break users of PyCrypto (and that seems like it is
> really obvious, to me - as opposed to a change which only accidentally
> breaks applications).  The added maintenance burden this causes makes
> PyCrypto less attractive (one nice thing about PyCrypto having been
> unmaintained for a long time is that Conch's use of it stayed as
> correct (or incorrect) as it was when it was written).  Basically, the
> question is whether I should expect more PyCrypto changes like this
> as development proceeds, or whether I can make the argument that backwards
> compatibility is a *good* thing compelling.
> Of course it's one thing to say "more backwards compatibility please".
> Actually deciding how that can be accomplished while allowing development
> to proceed in a useful direction is another.  However, I'm intentionally
> omitting details of that discussion from this message to keep things
> simple.  I'm convinced that some degree of backwards compatibility is
> always possible, regardless of the changes desired, so the details of how
> it works aren't as important as deciding whether backwards compatibility
> will be maintained.
> So, what do you say?  Can we decide that backwards compatibility is a good
> thing?
> Jean-Paul
> [1] -
> http://gitweb.pycrypto.org/?p=crypto/pycrypto-2.x.git;a=commit;h=5b5b496c0f81f3595d0aebb8da5196492abae429
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