3des-cfb failing to decrypt

Jussi Kivilinna jussi.kivilinna at iki.fi
Tue Mar 29 14:32:54 CEST 2016


On 2016-03-29 13:34, Werner Koch wrote:
> On Tue, 29 Mar 2016 10:47, andrew.stevenson at sociomantic.com said:
> 
>> Ah - that makes sense. Does gcrypt support 8 bit mode? I don't see
> 
> No.  Why is actually using anything but a mode macthing the block size?
> 

FIPS-81 defines k-bit CFB mode for DES where k is any number from 1 to
64. Maybe this had something to do with systems with different bits per
byte (6/7/8/?).

-Jussi

> 
> Salam-Shalom,
> 
>    Werner
> 



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