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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
#[cfg(any(test, feature = "testing", feature = "simulated-payouts"))]
pub mod test_utils;
use crate::errors::Error;
use bincode::{deserialize, serialize};
use miscreant::{Aead, Aes128SivAead};
use rand::distributions::{Alphanumeric, Distribution, Standard};
use rand::rngs::OsRng;
use rand::{self, Rng};
use serde::{Deserialize, Serialize};
pub const SYM_ENC_KEY_LEN: usize = 32;
pub const SYM_ENC_NONCE_LEN: usize = 16;
pub type SymEncKey = [u8; SYM_ENC_KEY_LEN];
pub type SymEncNonce = [u8; SYM_ENC_NONCE_LEN];
#[macro_export]
macro_rules! btree_set {
($($item:expr),*) => {{
let mut _set = ::std::collections::BTreeSet::new();
$(
let _ = _set.insert($item);
)*
_set
}};
($($item:expr),*,) => {
btree_set![$($item),*]
};
}
#[macro_export]
macro_rules! btree_map {
() => ({
::std::collections::BTreeMap::new()
});
($($key:expr => $value:expr),*) => {{
let mut _map = ::std::collections::BTreeMap::new();
$(
let _ = _map.insert($key, $value);
)*
_map
}};
($($key:expr => $value:expr),*,) => {
btree_map![$($key => $value),*]
};
}
#[derive(Serialize, Deserialize)]
struct SymmetricEnc {
nonce: SymEncNonce,
cipher_text: Vec<u8>,
}
pub fn generate_sym_enc_key() -> SymEncKey {
rand::random()
}
pub fn generate_nonce() -> SymEncNonce {
rand::random()
}
pub fn symmetric_encrypt(
plain_text: &[u8],
secret_key: &SymEncKey,
nonce: Option<&SymEncNonce>,
) -> Result<Vec<u8>, Error> {
let nonce = match nonce {
Some(nonce) => *nonce,
None => generate_nonce(),
};
let mut cipher = Aes128SivAead::new(secret_key);
let cipher_text = cipher.encrypt(&nonce, &[], plain_text);
Ok(serialize(&SymmetricEnc { nonce, cipher_text })?)
}
pub fn symmetric_decrypt(cipher_text: &[u8], secret_key: &SymEncKey) -> Result<Vec<u8>, Error> {
let SymmetricEnc { nonce, cipher_text } = deserialize::<SymmetricEnc>(cipher_text)?;
let mut cipher = Aes128SivAead::new(secret_key);
cipher
.decrypt(&nonce, &[], &cipher_text)
.map_err(|_| Error::SymmetricDecipherFailure)
}
pub fn generate_random_string(length: usize) -> String {
let mut rng = OsRng;
::std::iter::repeat(())
.map(|()| rng.gen::<char>())
.filter(|c| *c != '\u{0}')
.take(length)
.collect()
}
pub fn generate_readable_string(length: usize) -> String {
let mut rng = OsRng;
::std::iter::repeat(())
.map(|()| rng.sample(Alphanumeric))
.take(length)
.collect()
}
pub fn generate_random_vector<T>(length: usize) -> Vec<T>
where
Standard: Distribution<T>,
{
let mut rng = OsRng;
::std::iter::repeat(())
.map(|()| rng.gen::<T>())
.take(length)
.collect()
}
#[inline]
pub fn bin_data_format(data: &[u8]) -> String {
let len = data.len();
if len < 8 {
return format!("[ {:?} ]", data);
}
format!(
"[ {:02x} {:02x} {:02x} {:02x}..{:02x} {:02x} {:02x} {:02x} ]",
data[0],
data[1],
data[2],
data[3],
data[len - 4],
data[len - 3],
data[len - 2],
data[len - 1]
)
}
#[cfg(test)]
mod tests {
use super::*;
const SIZE: usize = 10;
#[test]
fn random_string() {
let str0 = generate_random_string(SIZE);
let str1 = generate_random_string(SIZE);
let str2 = generate_random_string(SIZE);
assert_ne!(str0, str1);
assert_ne!(str0, str2);
assert_ne!(str1, str2);
assert_eq!(str0.chars().count(), SIZE);
assert_eq!(str1.chars().count(), SIZE);
assert_eq!(str2.chars().count(), SIZE);
}
#[test]
fn random_vector() {
let vec0 = generate_random_vector::<u8>(SIZE);
let vec1 = generate_random_vector::<u8>(SIZE);
let vec2 = generate_random_vector::<u8>(SIZE);
assert_ne!(vec0, vec1);
assert_ne!(vec0, vec2);
assert_ne!(vec1, vec2);
assert_eq!(vec0.len(), SIZE);
assert_eq!(vec1.len(), SIZE);
assert_eq!(vec2.len(), SIZE);
}
}