amagi 0.1.3

Rust SDK, CLI, and Web API service skeleton for multi-platform social web adapters.
Documentation 
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const S: [u32; 64] = [
    7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9,
    14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 6, 10, 15,
    21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21,
];

const K: [u32; 64] = [
    0xd76a_a478,
    0xe8c7_b756,
    0x2420_70db,
    0xc1bd_ceee,
    0xf57c_0faf,
    0x4787_c62a,
    0xa830_4613,
    0xfd46_9501,
    0x6980_98d8,
    0x8b44_f7af,
    0xffff_5bb1,
    0x895c_d7be,
    0x6b90_1122,
    0xfd98_7193,
    0xa679_438e,
    0x49b4_0821,
    0xf61e_2562,
    0xc040_b340,
    0x265e_5a51,
    0xe9b6_c7aa,
    0xd62f_105d,
    0x0244_1453,
    0xd8a1_e681,
    0xe7d3_fbc8,
    0x21e1_cde6,
    0xc337_07d6,
    0xf4d5_0d87,
    0x455a_14ed,
    0xa9e3_e905,
    0xfcef_a3f8,
    0x676f_02d9,
    0x8d2a_4c8a,
    0xfffa_3942,
    0x8771_f681,
    0x6d9d_6122,
    0xfde5_380c,
    0xa4be_ea44,
    0x4bde_cfa9,
    0xf6bb_4b60,
    0xbebf_bc70,
    0x289b_7ec6,
    0xeaa1_27fa,
    0xd4ef_3085,
    0x0488_1d05,
    0xd9d4_d039,
    0xe6db_99e5,
    0x1fa2_7cf8,
    0xc4ac_5665,
    0xf429_2244,
    0x432a_ff97,
    0xab94_23a7,
    0xfc93_a039,
    0x655b_59c3,
    0x8f0c_cc92,
    0xffef_f47d,
    0x8584_5dd1,
    0x6fa8_7e4f,
    0xfe2c_e6e0,
    0xa301_4314,
    0x4e08_11a1,
    0xf753_7e82,
    0xbd3a_f235,
    0x2ad7_d2bb,
    0xeb86_d391,
];

pub(crate) fn md5_digest(input: &[u8]) -> [u8; 16] {
    let mut message = input.to_vec();
    let bit_len = (message.len() as u64) * 8;

    message.push(0x80);
    while message.len() % 64 != 56 {
        message.push(0);
    }
    message.extend_from_slice(&bit_len.to_le_bytes());

    let mut a0 = 0x6745_2301u32;
    let mut b0 = 0xefcd_ab89u32;
    let mut c0 = 0x98ba_dcfeu32;
    let mut d0 = 0x1032_5476u32;

    for chunk in message.chunks_exact(64) {
        let mut words = [0u32; 16];
        for (index, word) in words.iter_mut().enumerate() {
            let offset = index * 4;
            *word = u32::from_le_bytes([
                chunk[offset],
                chunk[offset + 1],
                chunk[offset + 2],
                chunk[offset + 3],
            ]);
        }

        let mut a = a0;
        let mut b = b0;
        let mut c = c0;
        let mut d = d0;

        for round in 0..64 {
            let (f, g) = if round < 16 {
                ((b & c) | ((!b) & d), round)
            } else if round < 32 {
                ((d & b) | ((!d) & c), (5 * round + 1) % 16)
            } else if round < 48 {
                (b ^ c ^ d, (3 * round + 5) % 16)
            } else {
                (c ^ (b | (!d)), (7 * round) % 16)
            };

            let next = a
                .wrapping_add(f)
                .wrapping_add(K[round])
                .wrapping_add(words[g]);

            a = d;
            d = c;
            c = b;
            b = b.wrapping_add(next.rotate_left(S[round]));
        }

        a0 = a0.wrapping_add(a);
        b0 = b0.wrapping_add(b);
        c0 = c0.wrapping_add(c);
        d0 = d0.wrapping_add(d);
    }

    let mut digest = [0u8; 16];
    digest[..4].copy_from_slice(&a0.to_le_bytes());
    digest[4..8].copy_from_slice(&b0.to_le_bytes());
    digest[8..12].copy_from_slice(&c0.to_le_bytes());
    digest[12..].copy_from_slice(&d0.to_le_bytes());
    digest
}

pub(crate) fn md5_hex(input: &[u8]) -> String {
    let digest = md5_digest(input);
    let mut output = String::with_capacity(32);
    for byte in digest {
        output.push(char::from_digit((byte >> 4) as u32, 16).expect("nibble should format"));
        output.push(char::from_digit((byte & 0x0f) as u32, 16).expect("nibble should format"));
    }
    output
}