GNUPG and Cast6

[Robert J. Hansen]

On 8/29/2013 2:01 PM, Csabi wrote:
> Why does not support GNUPG the CAST6 (256 bit key) variant of the CAST
> algorithm?

In addition to the other (correct) answers you've received, this one
also applies: "Because nobody else is using CAST6."

(Also, CAST6 is a different algorithm than CAST5.  It's not really a
"variant".  The algorithms are similar, yes, but then again so are
Blowfish and CAST5-128, and nobody calls Blowfish and CAST5 variants of
one another.)