mds_light_permutation

p3_poseidon2

Function mds_light_permutation 

Source 
pub fn mds_light_permutation<R: PrimeCharacteristicRing, MdsPerm4: MdsPermutation<R, 4>, const WIDTH: usize>(
    state: &mut [R; WIDTH],
    mdsmat: &MdsPerm4,
)
Expand description

Implement the matrix multiplication used by the external layer.

Given a 4x4 MDS matrix M, we multiply by the 4N x 4N matrix [[2M M ... M], [M 2M ... M], ..., [M M ... 2M]].

ยงPanics

This will panic if WIDTH is not supported. Currently, the supported WIDTH values are 2, 3, 4, 8, 12, 16, 20, 24.`