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
|
use super::block::Block;
#[cfg(target_arch = "x86_64")]
pub type AesImpl = x86_64::AesNi;
#[cfg(not(target_arch = "x86_64"))]
pub type AesImpl = AesSoft;
pub trait AesRound {
fn new(key_i: Block, key_j: Block, key_l: Block) -> Self;
fn aes4(&self, value: Block) -> Block;
fn aes10(&self, value: Block) -> Block;
}
/// Implementation of aes4 and aes10 in software.
///
/// Always available.
///
/// Uses the `aes` crate under the hood.
pub struct AesSoft {
key_i: aes::Block,
key_j: aes::Block,
key_l: aes::Block,
}
impl AesRound for AesSoft {
fn new(key_i: Block, key_j: Block, key_l: Block) -> Self {
Self {
key_i: key_i.bytes().into(),
key_j: key_j.bytes().into(),
key_l: key_l.bytes().into(),
}
}
fn aes4(&self, value: Block) -> Block {
let mut block: aes::Block = value.bytes().into();
::aes::hazmat::cipher_round(&mut block, &self.key_j);
::aes::hazmat::cipher_round(&mut block, &self.key_i);
::aes::hazmat::cipher_round(&mut block, &self.key_l);
::aes::hazmat::cipher_round(&mut block, &Block::null().bytes().into());
<Block as From<[u8; 16]>>::from(block.into())
}
fn aes10(&self, value: Block) -> Block {
let mut block: aes::Block = value.bytes().into();
::aes::hazmat::cipher_round(&mut block, &self.key_i);
::aes::hazmat::cipher_round(&mut block, &self.key_j);
::aes::hazmat::cipher_round(&mut block, &self.key_l);
::aes::hazmat::cipher_round(&mut block, &self.key_i);
::aes::hazmat::cipher_round(&mut block, &self.key_j);
::aes::hazmat::cipher_round(&mut block, &self.key_l);
::aes::hazmat::cipher_round(&mut block, &self.key_i);
::aes::hazmat::cipher_round(&mut block, &self.key_j);
::aes::hazmat::cipher_round(&mut block, &self.key_l);
::aes::hazmat::cipher_round(&mut block, &self.key_i);
<Block as From<[u8; 16]>>::from(block.into())
}
}
#[cfg(target_arch = "x86_64")]
pub mod x86_64 {
use super::*;
use core::arch::x86_64::*;
cpufeatures::new!(cpuid_aes, "aes");
pub struct AesNi {
support: cpuid_aes::InitToken,
fallback: AesSoft,
key_i: __m128i,
key_j: __m128i,
key_l: __m128i,
null: __m128i,
}
impl AesRound for AesNi {
fn new(key_i: Block, key_j: Block, key_l: Block) -> Self {
Self {
support: cpuid_aes::init(),
fallback: AesSoft::new(key_i, key_j, key_l),
key_i: key_i.simd().into(),
key_j: key_j.simd().into(),
key_l: key_l.simd().into(),
null: Block::null().simd().into(),
}
}
fn aes4(&self, value: Block) -> Block {
if !self.support.get() {
return self.fallback.aes4(value);
}
// SAFETY: Nothing should go wrong when calling AESENC
unsafe {
let mut block = value.simd().into();
block = _mm_aesenc_si128(block, self.key_j);
block = _mm_aesenc_si128(block, self.key_i);
block = _mm_aesenc_si128(block, self.key_l);
block = _mm_aesenc_si128(block, self.null);
Block::from_simd(block.into())
}
}
fn aes10(&self, value: Block) -> Block {
if !self.support.get() {
return self.fallback.aes10(value);
}
// SAFETY: Nothing should go wrong when calling AESENC
unsafe {
let mut block = value.simd().into();
block = _mm_aesenc_si128(block, self.key_i);
block = _mm_aesenc_si128(block, self.key_j);
block = _mm_aesenc_si128(block, self.key_l);
block = _mm_aesenc_si128(block, self.key_i);
block = _mm_aesenc_si128(block, self.key_j);
block = _mm_aesenc_si128(block, self.key_l);
block = _mm_aesenc_si128(block, self.key_i);
block = _mm_aesenc_si128(block, self.key_j);
block = _mm_aesenc_si128(block, self.key_l);
block = _mm_aesenc_si128(block, self.key_i);
Block::from_simd(block.into())
}
}
}
}
|
