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use gost94::{Gost94, SBox, Block};
use generic_array::typenum::U32;
use digest::Digest;
use generic_array::GenericArray;

const S2015: SBox = [
    [12, 4, 6, 2, 10, 5, 11, 9, 14, 8, 13, 7, 0, 3, 15, 1],
    [6, 8, 2, 3, 9, 10, 5, 12, 1, 14, 4, 7, 11, 13, 0, 15],
    [11, 3, 5, 8, 2, 15, 10, 13, 14, 1, 7, 4, 12, 9, 6, 0],
    [12, 8, 2, 1, 13, 4, 15, 6, 7, 0, 10, 5, 3, 14, 9, 11],
    [7, 15, 5, 10, 8, 1, 6, 13, 0, 9, 3, 14, 11, 4, 2, 12],
    [5, 13, 15, 6, 9, 2, 12, 10, 11, 7, 8, 1, 4, 3, 14, 0],
    [8, 14, 2, 5, 6, 9, 1, 12, 15, 4, 11, 0, 13, 10, 3, 7],
    [1, 7, 14, 13, 0, 5, 8, 3, 4, 15, 10, 6, 9, 12, 11, 2],
];

#[derive(Clone, Copy)]
pub struct Gost94s2015 {
    sh: Gost94
}

impl Gost94s2015 {
    pub fn new() -> Self {
        Gost94s2015{sh: Gost94::new(S2015, Block::default())}
    }
}

impl Default for Gost94s2015 {
    fn default() -> Self {
        Self::new()    
    }
}

impl Digest for Gost94s2015 {
    type OutputSize = U32;
    type BlockSize = U32;

    fn input(&mut self, input: &[u8]) {
        self.sh.input(input);
    }

    fn result(self) -> GenericArray<u8, Self::OutputSize> {
        self.sh.result()
    }
}