eva-crypto 0.1.2

Prototype level implementations of some encryption algorithms, with some generic traits.
Documentation 
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use super::generic::{create_u8x4, create_u8x4x4, u8x4, u8x4_to_u32, u8x4x4, Ops, Permutation};

pub struct SM4 {
    pub round_keys: Vec<u8x4>,
}

type SM4state = u8x4x4;

impl SM4 {
    pub fn new(key: &[u8]) -> SM4 {
        let mut round_keys = vec![[0; 4]; 32];
        key_expansion(key, &mut round_keys);
        SM4 { round_keys }
    }

    pub fn encrypt(self, data: &[u8]) -> Vec<u8> {
        let mut state = create_u8x4x4(data);
        for i in 0..32 {
            let new = round_function(&state, &self.round_keys[i]);
            state = [state[1], state[2], state[3], new];
        }
        reverse(&state).concat()
    }
    pub fn decrypt(self, data: &[u8]) -> Vec<u8> {
        let mut state = reverse(&create_u8x4x4(data));
        for i in (0..32).rev() {
            println!("{:x?}", state);
            let new = inv_round_function(&state, &self.round_keys[i]);
            state = [new, state[0], state[1], state[2]];
        }
        state.concat()
    }
}

fn key_expansion(key: &[u8], round_keys: &mut [u8x4]) {
    let mut reg = create_u8x4x4(key).xor(&[
        create_u8x4(FK[0]),
        create_u8x4(FK[1]),
        create_u8x4(FK[2]),
        create_u8x4(FK[3]),
    ]);
    for i in 0..32 {
        let rk = reg[0].xor(&lprime_substitution(tau_substitution(
            reg[1].xor(&reg[2].xor(&reg[3].xor(&create_u8x4(CK[i])))),
        )));
        round_keys[i] = rk;
        reg = [reg[1], reg[2], reg[3], rk];
    }
}

fn reverse(input: &SM4state) -> SM4state {
    [input[3], input[2], input[1], input[0]]
}

fn round_function(input: &[u8x4], round_key: &u8x4) -> u8x4 {
    let (x0, x1, x2, x3) = (input[0], input[1], input[2], input[3]);
    x0.xor(&l_substitution(tau_substitution(
        x1.xor(&x2.xor(&x3.xor(&round_key))),
    )))
}

fn inv_round_function(input: &[u8x4], round_key: &u8x4) -> u8x4 {
    let (x3, x2, x1, x0) = (input[0], input[1], input[2], input[3]);
    x0.xor(&l_substitution(tau_substitution(
        x1.xor(&x2.xor(&x3.xor(&round_key))),
    )))
}

fn tau_substitution(input: u8x4) -> u8x4 {
    input.sub_sbox(&SBOX)
}
fn l_substitution(input: u8x4) -> u8x4 {
    let word = u8x4_to_u32(input);
    create_u8x4(
        word ^ word.rotate_left(2)
            ^ word.rotate_left(10)
            ^ word.rotate_left(18)
            ^ word.rotate_left(24),
    )
}

fn lprime_substitution(input: u8x4) -> u8x4 {
    let word = u8x4_to_u32(input);
    create_u8x4(word ^ (word.rotate_left(13)) ^ (word.rotate_left(23)))
}

pub static SBOX: [u8; 256] = [
    0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
    0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
    0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
    0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
    0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
    0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
    0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
    0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
    0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
    0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
    0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
    0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
    0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
    0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
    0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
    0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48,
];

pub static FK: [u32; 4] = [0xa3b1_bac6, 0x56aa_3350, 0x677d_9197, 0xb270_22dc];

pub static CK: [u32; 32] = [
    0x0007_0E15,
    0x1C23_2A31,
    0x383F_464D,
    0x545B_6269,
    0x7077_7E85,
    0x8C93_9AA1,
    0xA8AF_B6BD,
    0xC4CB_D2D9,
    0xE0E7_EEF5,
    0xFC03_0A11,
    0x181F_262D,
    0x343B_4249,
    0x5057_5E65,
    0x6C73_7A81,
    0x888F_969D,
    0xA4AB_B2B9,
    0xC0C7_CED5,
    0xDCE3_EAF1,
    0xF8FF_060D,
    0x141B_2229,
    0x3037_3E45,
    0x4C53_5A61,
    0x686F_767D,
    0x848B_9299,
    0xA0A7_AEB5,
    0xBCC3_CAD1,
    0xD8DF_E6ED,
    0xF4FB_0209,
    0x1017_1E25,
    0x2C33_3A41,
    0x484F_565D,
    0x646B_7279,
];