Why Twofish implementation only with 256 bit ?

[David Shaw]

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On Sat, May 03, 2003 at 02:46:02PM +0200, Malte Gell wrote:

> one of the common capabilities of all AES candidates was to offer 
> different key length, e.g. 128,192,256 bit. So one can edit his key in 
> order to make use of AES256 instead of "standard" 128 bit AES.
> 
> Why is this not the case with Twofish ? If I look at cipher.h it seems 
> 128 bit Twofish is deprecated and only experimental and the cipher 
> option "Twofish" always refers to 256 bit Twofish, so why is there no 
> Twofish/Twofish192/Twofish256 just as it is the case with Rijndael ?

The reason is the OpenPGP standard.  "Twofish", in RFC-2440, is
specified as 256-bit.

David
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