aes 0.9.2

Pure Rust implementation of the Advanced Encryption Standard (a.k.a. Rijndael)
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138

use super::{BatchBlocks, NativeWord, State, Word, mix_columns::*, sbox::*, utils::*};
use crate::hazmat::{Block, Block8};
use cipher::typenum::Unsigned;

/// XOR the `src` block into the `dst` block in-place.
fn xor_in_place(dst: &mut Block, src: &Block) {
    for (a, b) in dst.iter_mut().zip(src.as_slice()) {
        *a ^= *b;
    }
}

#[inline]
fn inv_bitslice_one<W: Word>(block: &mut Block, state: &State<W>) {
    let out = W::inv_bitslice(state);
    block.copy_from_slice(out[0].as_slice());
}

fn cipher_round_generic<W: Word>(block: &mut Block, round_key: &Block) {
    let mut state = State::<W>::default();
    W::bitslice(&mut state, &broadcast::<W>(block.as_slice()));
    sub_bytes(&mut state);
    sub_bytes_nots(&mut state);
    shift_rows_1(&mut state);
    mix_columns_0(&mut state);
    inv_bitslice_one(block, &state);
    xor_in_place(block, round_key);
}

fn cipher_round_par_generic<W: Word>(blocks: &mut Block8, round_keys: &Block8) {
    let blocks_per_batch = <<W as Word>::Blocks>::USIZE;
    for (chunk, keys) in blocks
        .chunks_exact_mut(blocks_per_batch)
        .zip(round_keys.chunks_exact(blocks_per_batch))
    {
        let mut state = State::<W>::default();
        let mut batch = BatchBlocks::<W>::default();
        for (slot, blk) in batch.iter_mut().zip(chunk.iter()) {
            slot.copy_from_slice(blk.as_slice());
        }
        W::bitslice(&mut state, &batch);
        sub_bytes(&mut state);
        sub_bytes_nots(&mut state);
        shift_rows_1(&mut state);
        mix_columns_0(&mut state);
        let res = W::inv_bitslice(&state);

        for i in 0..blocks_per_batch {
            chunk[i] = res[i];
            xor_in_place(&mut chunk[i], &keys[i]);
        }
    }
}

fn equiv_inv_cipher_round_generic<W: Word>(block: &mut Block, round_key: &Block) {
    let mut state = State::<W>::default();
    W::bitslice(&mut state, &broadcast::<W>(block.as_slice()));
    sub_bytes_nots(&mut state);
    inv_sub_bytes(&mut state);
    inv_shift_rows_1(&mut state);
    inv_mix_columns_0(&mut state);
    inv_bitslice_one(block, &state);
    xor_in_place(block, round_key);
}

fn equiv_inv_cipher_round_par_generic<W: Word>(blocks: &mut Block8, round_keys: &Block8) {
    let blocks_per_batch = <<W as Word>::Blocks>::USIZE;
    for (chunk, keys) in blocks
        .chunks_exact_mut(blocks_per_batch)
        .zip(round_keys.chunks_exact(blocks_per_batch))
    {
        let mut state = State::<W>::default();
        let mut batch = BatchBlocks::<W>::default();
        for (slot, blk) in batch.iter_mut().zip(chunk.iter()) {
            slot.copy_from_slice(blk.as_slice());
        }
        W::bitslice(&mut state, &batch);
        sub_bytes_nots(&mut state);
        inv_sub_bytes(&mut state);
        inv_shift_rows_1(&mut state);
        inv_mix_columns_0(&mut state);
        let res = W::inv_bitslice(&state);

        for i in 0..blocks_per_batch {
            chunk[i] = res[i];
            xor_in_place(&mut chunk[i], &keys[i]);
        }
    }
}

fn mix_columns_generic<W: Word>(block: &mut Block) {
    let mut state = State::<W>::default();
    W::bitslice(&mut state, &broadcast::<W>(block.as_slice()));
    mix_columns_0(&mut state);
    inv_bitslice_one(block, &state);
}

fn inv_mix_columns_generic<W: Word>(block: &mut Block) {
    let mut state = State::<W>::default();
    W::bitslice(&mut state, &broadcast::<W>(block.as_slice()));
    inv_mix_columns_0(&mut state);
    inv_bitslice_one(block, &state);
}

/// AES cipher (encrypt) round function.
#[inline]
pub(crate) fn cipher_round(block: &mut Block, round_key: &Block) {
    cipher_round_generic::<NativeWord>(block, round_key)
}

/// AES cipher (encrypt) round function: parallel version.
#[inline]
pub(crate) fn cipher_round_par(blocks: &mut Block8, round_keys: &Block8) {
    cipher_round_par_generic::<NativeWord>(blocks, round_keys)
}

/// AES cipher (encrypt) inverse round function.
#[inline]
pub(crate) fn equiv_inv_cipher_round(block: &mut Block, round_key: &Block) {
    equiv_inv_cipher_round_generic::<NativeWord>(block, round_key)
}

/// AES cipher (encrypt) inverse round function: parallel version.
#[inline]
pub(crate) fn equiv_inv_cipher_round_par(blocks: &mut Block8, round_keys: &Block8) {
    equiv_inv_cipher_round_par_generic::<NativeWord>(blocks, round_keys)
}

/// AES mix columns function.
#[inline]
pub(crate) fn mix_columns(block: &mut Block) {
    mix_columns_generic::<NativeWord>(block)
}

/// AES inverse mix columns function.
#[inline]
pub(crate) fn inv_mix_columns(block: &mut Block) {
    inv_mix_columns_generic::<NativeWord>(block)
}