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
use core::fmt::{self, Display};
mod zig {
extern "C" {
pub fn seal(c: *mut u8, c_len: usize, m: *const u8, m_len: usize, pk: *const u8) -> i32;
pub fn open(
m: *mut u8,
m_len: usize,
c: *const u8,
c_len: usize,
pk: *const u8,
sk: *const u8,
) -> i32;
pub fn keygen(pk: *mut u8, sk: *mut u8);
}
}
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub enum Error {
VerificationFailed,
}
impl std::error::Error for Error {}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Error::VerificationFailed => write!(f, "Verification failed"),
}
}
}
pub type PublicKey = [u8; 32];
pub type SecretKey = [u8; 32];
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct KeyPair {
pub pk: PublicKey,
pub sk: SecretKey,
}
impl KeyPair {
pub fn create() -> Self {
let mut pk = [0u8; 32];
let mut sk = [0u8; 32];
unsafe { zig::keygen(pk.as_mut_ptr(), sk.as_mut_ptr()) };
Self { pk, sk }
}
pub fn to_bytes(&self) -> [u8; 64] {
let mut buf = [0u8; 64];
buf[0..31].copy_from_slice(&self.pk);
buf[32..63].copy_from_slice(&self.sk);
return buf;
}
pub fn from_bytes(&self, buf: &[u8; 64]) -> Self {
let mut pk = [0u8; 32];
let mut sk = [0u8; 32];
pk.copy_from_slice(&buf[0..31]);
sk.copy_from_slice(&buf[32..63]);
Self { pk, sk }
}
pub fn new(pk: PublicKey, sk: SecretKey) -> Self {
Self { pk, sk }
}
}
pub const ABYTES: usize = 32 + 16;
pub fn seal(msg: impl AsRef<[u8]>, peer_pk: PublicKey) -> Vec<u8> {
let msg = msg.as_ref();
let ciphertext_len = msg.len() + ABYTES;
let mut ciphertext = Vec::with_capacity(ciphertext_len);
unsafe {
zig::seal(
ciphertext.as_mut_ptr(),
ciphertext_len,
msg.as_ptr(),
msg.len(),
peer_pk.as_ptr(),
);
ciphertext.set_len(ciphertext_len);
};
ciphertext
}
pub fn open(ciphertext: impl AsRef<[u8]>, kp: &KeyPair) -> Result<Vec<u8>, Error> {
let ciphertext = ciphertext.as_ref();
if ciphertext.len() < ABYTES {
return Err(Error::VerificationFailed);
}
let mut msg = vec![0u8; ciphertext.len() - ABYTES];
if unsafe {
zig::open(
msg.as_mut_ptr(),
msg.len(),
ciphertext.as_ptr(),
ciphertext.len(),
kp.pk.as_ptr(),
kp.sk.as_ptr(),
)
} != 0
{
return Err(Error::VerificationFailed);
}
Ok(msg)
}
#[cfg(test)]
mod test {
use crate as sealed_box;
#[test]
fn test_sealed_box() {
let recipient_kp = sealed_box::KeyPair::create();
let msg = b"test";
let ciphertext = sealed_box::seal(msg, recipient_kp.pk);
let decrypted_msg = sealed_box::open(&ciphertext, &recipient_kp).unwrap();
assert_eq!(msg[..], decrypted_msg);
}
#[test]
fn test_sealed_box_existing_kp() {
let pk = [
0x25, 0xb2, 0x9d, 0xb0, 0x35, 0x7a, 0x5d, 0x2c, 0xb7, 0x7d, 0xd2, 0xd5, 0x7a, 0xfb,
0xbf, 0x30, 0xa2, 0x80, 0x23, 0xda, 0x5f, 0x2d, 0x7b, 0x80, 0xdf, 0x86, 0x65, 0xe4,
0xbb, 0x0d, 0x45, 0x6f,
];
let sk = [
0xaa, 0x5b, 0xc4, 0xf5, 0x16, 0xe4, 0x26, 0xe2, 0x30, 0xc6, 0x9f, 0xcc, 0x19, 0x62,
0x12, 0x67, 0x18, 0xf4, 0x4d, 0x63, 0x41, 0x1d, 0x6d, 0xb4, 0xa9, 0x68, 0xb2, 0xe7,
0xa5, 0x64, 0x22, 0x3a,
];
let recipient_kp = sealed_box::KeyPair::new(pk, sk);
let msg = b"test";
let ciphertext = sealed_box::seal(msg, recipient_kp.pk);
let decrypted_msg = sealed_box::open(&ciphertext, &recipient_kp).unwrap();
assert_eq!(msg[..], decrypted_msg);
}
}