generate_round_key.rs

// rustc generate_round_key.rs -o generate_round_key
// ./generate_round_key

#[cfg_attr(rustfmt, rustfmt_skip)]
static S: [u8; 16 * 16] = [
    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 s_box(input: u8) -> u8 {
    let x = (input >> 4) & 0xF;
    let y = input & 0xF;
    S[x as usize * 16 + y as usize]
}

fn g(x: u32, rc: u8) -> u32 {
    let mut y = [0u8; 4];
    y[3] = ((x >> 24) & 0xFF) as _;
    y[0] = ((x >> 16) & 0xFF) as _;
    y[1] = ((x >> 8) & 0xFF) as _;
    y[2] = (x & 0xFF) as _;

    for a in &mut y {
        *a = s_box(*a);
    }

    (y[3] as u32) | (y[2] as u32) << 8 | (y[1] as u32) << 16 | ((y[0] ^ rc) as u32) << 24
}

fn h(x: u32) -> u32 {
    ((s_box(((x >> 24) & 0xFF) as u8) as u32) << 24)
        | ((s_box(((x >> 16) & 0xFF) as u8) as u32) << 16)
        | ((s_box(((x >> 8) & 0xFF) as u8) as u32) << 8) | (s_box((x & 0xFF) as u8) as u32)
}

fn aes_keygen_256(input: [u32; 8], rc: u8) -> [u32; 8] {
    let mut out = [0u32; 8];

    out[0] = input[0] ^ g(input[7], rc);
    out[1] = input[1] ^ out[0];
    out[2] = input[2] ^ out[1];
    out[3] = input[3] ^ out[2];
    out[4] = input[4] ^ h(out[3]);
    out[5] = input[5] ^ out[4];
    out[6] = input[6] ^ out[5];
    out[7] = input[7] ^ out[6];

    out
}

fn print(a: &[u32]) {
    for (i, x) in a.iter().enumerate() {
        println!("W[{}] &= 0x{:08x} \\\\", i, x);
    }
}

fn main() {
    let r1 = aes_keygen_256(
        [
            0x4e6f6368, 0x2065696e, 0x6520576f, 0x63686520, 0x62697320, 0x57656968, 0x6e616368,
            0x74656e21,
        ],
        0b1,
    );
    print(&r1);
    let r2 = aes_keygen_256(r1, 0b10);
    print(&r2);
}