libmonero 0.1.9

Batteries-included Monero Library
Documentation 
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/*
 * This file is part of Monume's library libmonero
 *
 * Copyright (c) 2023-2024, Monume (monume.xyz)
 * All Rights Reserved
 * The code is distributed under MIT license, see LICENSE file for details.
 * Generated by Monume
 *
 */

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

fn gmul2(a: u8) -> u8 {
    let h = !(a >> 7).wrapping_sub(1);

    (a << 1) ^ (0x1B & h)
}

fn sub_bytes(block: &mut [u8]) {
    for c in block.iter_mut() {
        *c = SBOX[*c as usize];
    }
}

fn schedule_core(new_key: &mut [u8], rcon: u8) {
    new_key.rotate_left(1);
    sub_bytes(new_key);
    new_key[0] ^= rcon;
}

pub fn derive_key(main: &[u8]) -> [u8; 160] {
    let mut key_buffer = [0u8; 160];
    key_buffer[..32].copy_from_slice(main);

    let mut rcon = 1;

    for offset in (32..key_buffer.len()).step_by(4) {
        let (finished, in_progress) = key_buffer.split_at_mut(offset);
        let previous = &finished[offset - 4..];
        let next = &mut in_progress[..4];
        next.copy_from_slice(previous);

        if offset % 32 == 0 {
            schedule_core(next, rcon);
            rcon = gmul2(rcon);
        } else if offset % 32 == 16 {
            sub_bytes(next);
        }

        xor(next, &finished[(offset - 32)..]);
    }

    key_buffer
}

pub fn xor(block: &mut [u8], round_key: &[u8]) {
    for (c, k) in block.iter_mut().zip(round_key.iter()) {
        *c ^= *k;
    }
}

pub fn aes_round(block: &mut [u8], round_key: &[u8]) {
    sub_bytes(block);
    shift_rows(block);
    mix_columns(block);
    xor(block, round_key);
}

fn mix_columns(block: &mut [u8]) {
    for column in block.chunks_exact_mut(4) {
        mix_column(column);
    }
}

fn mix_column(slice: &mut [u8]) {
    let mut a = [0u8; 4];
    let mut b = [0u8; 4];

    a.copy_from_slice(slice);

    for (c, db) in slice.iter().zip(b.iter_mut()) {
        *db = gmul2(*c);
    }

    for (i, dest) in slice.iter_mut().enumerate() {
        *dest = b[i] ^ a[(i + 3) % 4] ^ a[(i + 2) % 4] ^ a[(i + 1) % 4] ^ b[(i + 1) % 4];
    }
}

fn shift_rows(block: &mut [u8]) {
    // Row 0 doesn't move
    // Swap row 1
    let tmp = block[1];
    for col in 0..3 {
        let index = 1 + 4 * col;
        block[index] = block[index + 4];
    }
    block[13] = tmp;

    // Swap row 2
    block.swap(2, 10);
    block.swap(6, 14);

    // Swap row 3
    let tmp = block[15];
    for col in (1..4).rev() {
        block[col * 4 + 3] = block[col * 4 - 1];
    }
    block[3] = tmp;
}