is this double CBC?

through my own coding experiments it appears that i am cerating a CBC mode
on two seperate levels when i only intended one.

please allow me to explain.

i have a 512 bit block broken up into 16 distinct 32 bit segments, the first
of these segments is combined with the salt before it is combined with 32
bit segment of key.

the second 32 bit segment of the block is combined with the first and then
combine with the next 32 bit segment of key.

the same is applied to the 3rd segment, 4th segment, 5th etc throughout the
whole block.

the first block is combined with the second before being segmented and the
above sequence applied, the same is applied to the 3rd block, 4th block etc
through to the end of the message.

is this double CBC mode? if so, is it worth the effort in regard to time
taken and computational cycles?


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