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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
use super::codec::StreamCipher;
use aes_ctr::stream_cipher::generic_array::GenericArray;
use aes_ctr::stream_cipher::{NewStreamCipher, LoopError, SyncStreamCipher};
use aes_ctr::{Aes128Ctr, Aes256Ctr};
use ctr::Ctr128;
use twofish::Twofish;
#[derive(Clone, Copy, Debug)]
pub enum Cipher {
Aes128,
Aes256,
TwofishCtr,
Null,
}
impl Cipher {
pub fn key_size(&self) -> usize {
match *self {
Cipher::Aes128 => 16,
Cipher::Aes256 => 32,
Cipher::TwofishCtr => 32,
Cipher::Null => 0,
}
}
#[inline]
pub fn iv_size(&self) -> usize {
match self {
Cipher::Aes128 | Cipher::Aes256 | Cipher::TwofishCtr => 16,
Cipher::Null => 0
}
}
}
#[derive(Clone, Copy, Debug)]
pub struct NullCipher;
impl SyncStreamCipher for NullCipher {
fn try_apply_keystream(&mut self, _data: &mut [u8]) -> Result<(), LoopError> {
Ok(())
}
}
#[cfg(not(all(feature = "aes-all", any(target_arch = "x86_64", target_arch = "x86"))))]
pub fn ctr(key_size: Cipher, key: &[u8], iv: &[u8]) -> StreamCipher {
ctr_int(key_size, key, iv)
}
#[cfg(all(feature = "aes-all", any(target_arch = "x86_64", target_arch = "x86")))]
pub fn ctr(key_size: Cipher, key: &[u8], iv: &[u8]) -> StreamCipher {
if *aes_alt::AES_NI {
aes_alt::ctr_alt(key_size, key, iv)
} else {
ctr_int(key_size, key, iv)
}
}
#[cfg(all(feature = "aes-all", any(target_arch = "x86_64", target_arch = "x86")))]
mod aes_alt {
use crate::codec::StreamCipher;
use ctr::Ctr128;
use aesni::{Aes128, Aes256};
use ctr::stream_cipher::NewStreamCipher;
use ctr::stream_cipher::generic_array::GenericArray;
use lazy_static::lazy_static;
use twofish::Twofish;
use super::{Cipher, NullCipher};
lazy_static! {
pub static ref AES_NI: bool = is_x86_feature_detected!("aes")
&& is_x86_feature_detected!("sse2")
&& is_x86_feature_detected!("sse3");
}
pub type Aes128Ctr = Ctr128<Aes128>;
pub type Aes256Ctr = Ctr128<Aes256>;
pub fn ctr_alt(key_size: Cipher, key: &[u8], iv: &[u8]) -> StreamCipher {
match key_size {
Cipher::Aes128 => Box::new(Aes128Ctr::new(
GenericArray::from_slice(key),
GenericArray::from_slice(iv),
)),
Cipher::Aes256 => Box::new(Aes256Ctr::new(
GenericArray::from_slice(key),
GenericArray::from_slice(iv),
)),
Cipher::TwofishCtr => Box::new(Ctr128::<Twofish>::new(
GenericArray::from_slice(key),
GenericArray::from_slice(iv),
)),
Cipher::Null => Box::new(NullCipher),
}
}
}
#[inline]
fn ctr_int(key_size: Cipher, key: &[u8], iv: &[u8]) -> StreamCipher {
match key_size {
Cipher::Aes128 => Box::new(Aes128Ctr::new(
GenericArray::from_slice(key),
GenericArray::from_slice(iv),
)),
Cipher::Aes256 => Box::new(Aes256Ctr::new(
GenericArray::from_slice(key),
GenericArray::from_slice(iv),
)),
Cipher::TwofishCtr => Box::new(Ctr128::<Twofish>::new(
GenericArray::from_slice(key),
GenericArray::from_slice(iv),
)),
Cipher::Null => Box::new(NullCipher),
}
}
#[cfg(all(
feature = "aes-all",
any(target_arch = "x86_64", target_arch = "x86"),
))]
#[cfg(test)]
mod tests {
use super::{Cipher, ctr};
#[test]
fn assert_non_native_run() {
let key = [0;16];
let iv = [0;16];
let mut aes = ctr(Cipher::Aes128, &key, &iv);
let mut content = [0;16];
aes.encrypt(&mut content);
}
}
#[cfg(all(
feature = "aes-all",
any(target_arch = "x86_64", target_arch = "x86"),
any(target_feature = "aes", target_feature = "ssse3"),
))]
compile_error!(
"aes-all must be compile without aes and sse3 flags : currently \
is_x86_feature_detected macro will not detect feature correctly otherwhise. \
RUSTFLAGS=\"-C target-feature=+aes,+ssse3\" enviromental variable. \
For x86 target arch additionally enable sse2 target feature."
);