Cipher preference

James Cloos cloos at jhcloos.com
Sat Jan 25 08:15:24 EST 2014


>>>>> "DM" == Damien Miller <djm at mindrot.org> writes:

DM> Evidence? openssl/crypto/modes/gcm128.c is full of array operations
DM> that look decidedly non-constant time to me.

[Appologies for the delay.]

Then it seems that the articles which favoured gcm presumed that it
would only get use with aesni or equivalent, or that I misread the
authors' intent. :(

An alternative would be an easy way to specify a preferred option for
configs Ciphers, KexAlgorithms and/or MACs without disabling the
defaults and without having to re-specify all of them.

It might take the form of a string, such as DEFAULT, which expands to
the default list or something like preferredCiphers, preferredKex and
preferredMACs which, if set, are tried first.

The ability to prefer a given algorithm set w/o blocking connections to
hosts which cannot handle that set is useful.  Doing so w/o having to
duplicate the full list in the config file is even better.

-JimC
--
James Cloos <cloos at jhcloos.com>         OpenPGP: 1024D/ED7DAEA6
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