blockset 0.3.1

Data Block Set
Documentation 
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use crate::{
    sigma32::{BIG0, BIG1, SMALL0, SMALL1},
    u128::{from_u32x4, get_u32, to_u32x4},
    u224::U224,
    u256::{u32x8_add, U256},
    u32::{add, add3, add4},
    u512::{get_u128, new, U512},
};

const fn round([s0, s1]: U256, i: usize, w: u128, k: u128) -> U256 {
    let (a, e) = {
        let t1 = {
            let [e, f, g, h] = to_u32x4(s1);
            add4(
                h,
                BIG1.get(e),
                (e & f) ^ (!e & g),
                get_u32(k, i),
                get_u32(w, i),
            )
        };
        let [a, b, c, d] = to_u32x4(s0);
        let t2 = add(BIG0.get(a), (a & b) ^ (a & c) ^ (b & c));
        (add(t1, t2), add(d, t1))
    };
    [a as u128 | (s0 << 32), e as u128 | (s1 << 32)]
}

const fn round4(mut x: U256, i: usize, w: &U512, k: &U512) -> U256 {
    let w = get_u128(w, i);
    let k = get_u128(k, i);
    x = round(x, 0, w, k);
    x = round(x, 1, w, k);
    x = round(x, 2, w, k);
    round(x, 3, w, k)
}

pub const K: [U512; 4] = [
    new(
        0xe9b5dba5_b5c0fbcf_71374491_428a2f98,
        0xab1c5ed5_923f82a4_59f111f1_3956c25b,
        0x550c7dc3_243185be_12835b01_d807aa98,
        0xc19bf174_9bdc06a7_80deb1fe_72be5d74,
    ),
    new(
        0x240ca1cc_0fc19dc6_efbe4786_e49b69c1,
        0x76f988da_5cb0a9dc_4a7484aa_2de92c6f,
        0xbf597fc7_b00327c8_a831c66d_983e5152,
        0x14292967_06ca6351_d5a79147_c6e00bf3,
    ),
    new(
        0x53380d13_4d2c6dfc_2e1b2138_27b70a85,
        0x92722c85_81c2c92e_766a0abb_650a7354,
        0xc76c51a3_c24b8b70_a81a664b_a2bfe8a1,
        0x106aa070_f40e3585_d6990624_d192e819,
    ),
    new(
        0x34b0bcb5_2748774c_1e376c08_19a4c116,
        0x682e6ff3_5b9cca4f_4ed8aa4a_391c0cb3,
        0x8cc70208_84c87814_78a5636f_748f82ee,
        0xc67178f2_bef9a3f7_a4506ceb_90befffa,
    ),
];

const fn round16(mut x: U256, w: &U512, i: usize) -> U256 {
    let k = &K[i];
    x = round4(x, 0, w, k);
    x = round4(x, 1, w, k);
    x = round4(x, 2, w, k);
    round4(x, 3, w, k)
}

#[inline(always)]
const fn w_round(w0: u32, w1: u32, w9: u32, we: u32) -> u32 {
    add3(SMALL1.get(we), w9, SMALL0.get(w1), w0)
}

#[inline(always)]
const fn wi(w: &U512, i: usize) -> u128 {
    get_u128(w, i)
}

// ```
// | |0   |1   |2   |3   |
// | |0123|0123|0123|0123|
// | |0123|4567|89AB|CDEF|
// |-|----|----|----|----|
// |0|WR  |    | R  |  R |
// |1| WR |    |  R |   R|
// |2|R WR|    |   R|    |
// |3| R W|R   |    |R   |
// ```
//
// - `R` - read
// - `W` - read and write.
const fn w_round4(w: &U512, i: usize) -> u128 {
    let [mut w00, mut w01, mut w02, mut w03] = to_u32x4(wi(w, i));
    let w10 = wi(w, i + 1) as u32;
    let [_, w21, w22, w23] = to_u32x4(wi(w, i + 2));
    let [w30, _, w32, w33] = to_u32x4(wi(w, i + 3));
    w00 = w_round(w00, w01, w21, w32);
    w01 = w_round(w01, w02, w22, w33);
    w02 = w_round(w02, w03, w23, w00);
    w03 = w_round(w03, w10, w30, w01);
    from_u32x4([w00, w01, w02, w03])
}

const fn w_round16(mut w: U512) -> U512 {
    w[0][0] = w_round4(&w, 0);
    w[0][1] = w_round4(&w, 1);
    w[1][0] = w_round4(&w, 2);
    w[1][1] = w_round4(&w, 3);
    w
}

pub const INIT: U256 = [
    0xf70e5939_3070dd17_367cd507_c1059ed8,
    0xbefa4fa4_64f98fa7_68581511_ffc00b31,
];

pub const fn compress(mut w: U512) -> U256 {
    let mut x: U256 = INIT;
    x = round16(x, &w, 0);
    w = w_round16(w);
    x = round16(x, &w, 1);
    w = w_round16(w);
    x = round16(x, &w, 2);
    w = w_round16(w);
    x = round16(x, &w, 3);
    x = u32x8_add(&x, &INIT);
    x[1] |= 0xFFFF_FFFF << 96;
    x
}

pub const fn compress_one(digest: &U256) -> U224 {
    let [a0, a1] = compress([*digest, [0, 0]]);
    let [a10, a11, a12, _] = to_u32x4(a1);
    let [a00, a01, a02, a03] = to_u32x4(a0);
    [a00, a01, a02, a03, a10, a11, a12]
}

#[cfg(test)]
mod test {
    use wasm_bindgen_test::wasm_bindgen_test;

    use crate::u256::U256;

    use super::compress;

    const A: U256 = compress([[0x8000_0000, 0], [0, 0]]);

    #[wasm_bindgen_test]
    #[test]
    fn test() {
        assert_eq!(
            A,
            [
                0x288234c4_476102bb_2a3a2bc9_d14a028c,
                0xFFFFFFFF_c5b3e42f_828ea62a_15a2b01f,
            ]
        );
    }

    #[wasm_bindgen_test]
    #[test]
    fn runtime_test() {
        assert_eq!(
            compress([[0x8000_0000, 0], [0, 0]]),
            [
                0x288234c4_476102bb_2a3a2bc9_d14a028c,
                0xFFFFFFFF_c5b3e42f_828ea62a_15a2b01f,
            ]
        );
    }
}