Libgcrypt CFB-mode as CFB-8bit

liza liza.churkyn at
Thu Apr 14 13:03:14 CEST 2016


I am writing an application that must integrate with a number of other 
external systems over which I have no control. Several of those systems 
already use 8 bit CFB mode to encrypt some data they send and they are 
not likely to change anytime soon. I had hoped to use gcrypt to do the 
decryption and while it works for all the other algorithms in use it 
doesn't for this one.


On 13/04/16 18:05, Werner Koch wrote:
> On Wed, 13 Apr 2016 11:40, liza.churkyn at said:
>> I need to be able to decrypt CFB-8bit with Libgcrypt. Since this is
>> currently not supported, I would like to submit a patch
>> that adds support for this.
> Can you name an application for an 8 bit CFB mode?  I doubt that any new
> protocol will use that and support for legacy protocols should only be
> done if it is worth the trouble.
> Shalom-Salam,
>     Werner

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