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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
//! Cryptographic primitives.
use std::io::Read;
use std::ops::{Deref, DerefMut};
use std::fmt;
use std::cmp::Ordering;
use memsec;
use nettle;
use nettle::random::Yarrow;
use constants::HashAlgorithm;
use Result;
pub(crate) mod aead;
mod asymmetric;
pub(crate) mod ecdh;
mod hash;
pub mod mpis;
pub mod s2k;
pub(crate) mod symmetric;
pub use self::asymmetric::{
Signer,
KeyPair,
};
pub use self::hash::Hash;
/// Holds a session key.
///
/// The session key is cleared when dropped.
#[derive(Clone, Eq)]
pub struct SessionKey(Box<[u8]>);
impl PartialEq for SessionKey {
fn eq(&self, other: &Self) -> bool {
secure_cmp(&self.0, &other.0) == Ordering::Equal
}
}
impl SessionKey {
/// Creates a new session key.
pub fn new(rng: &mut Yarrow, size: usize) -> Self {
let mut sk = vec![0; size];
rng.random(&mut sk);
sk.into()
}
}
impl Deref for SessionKey {
type Target = [u8];
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl DerefMut for SessionKey {
fn deref_mut(&mut self) -> &mut [u8] {
&mut self.0
}
}
impl From<Vec<u8>> for SessionKey {
fn from(v: Vec<u8>) -> Self {
SessionKey(v.into_boxed_slice())
}
}
impl From<Box<[u8]>> for SessionKey {
fn from(v: Box<[u8]>) -> Self {
SessionKey(v)
}
}
impl Drop for SessionKey {
fn drop(&mut self) {
unsafe {
memsec::memzero(self.0.as_mut_ptr(), self.0.len());
}
}
}
impl fmt::Debug for SessionKey {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if cfg!(debug_assertions) {
write!(f, "SessionKey ({:?})", self.0)
} else {
f.write_str("SessionKey ( <Redacted> )")
}
}
}
/// Holds a password.
///
/// The password is cleared when dropped.
#[derive(Clone, Eq)]
pub struct Password(Box<[u8]>);
impl PartialEq for Password {
fn eq(&self, other: &Self) -> bool {
secure_cmp(&self.0, &other.0) == Ordering::Equal
}
}
impl Deref for Password {
type Target = [u8];
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl From<Vec<u8>> for Password {
fn from(v: Vec<u8>) -> Self {
Password(v.into_boxed_slice())
}
}
impl From<Box<[u8]>> for Password {
fn from(v: Box<[u8]>) -> Self {
Password(v)
}
}
impl From<String> for Password {
fn from(v: String) -> Self {
v.into_bytes().into()
}
}
impl<'a> From<&'a str> for Password {
fn from(v: &'a str) -> Self {
v.to_owned().into()
}
}
impl Drop for Password {
fn drop(&mut self) {
unsafe {
memsec::memzero(self.0.as_mut_ptr(), self.0.len());
}
}
}
impl fmt::Debug for Password {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if cfg!(debug_assertions) {
write!(f, "Password ({:?})", self.0)
} else {
f.write_str("Password ( <Redacted> )")
}
}
}
/// Hash the specified file.
///
/// This is useful when verifying detached signatures.
pub fn hash_file<R: Read>(reader: R, algos: &[HashAlgorithm])
-> Result<Vec<(HashAlgorithm, Box<nettle::Hash>)>>
{
use std::mem;
use ::parse::HashedReader;
use ::parse::HashesFor;
use buffered_reader::BufferedReader;
use buffered_reader::BufferedReaderGeneric;
let reader
= BufferedReaderGeneric::with_cookie(
reader, None, Default::default());
let mut reader
= HashedReader::new(reader, HashesFor::Signature, algos.to_vec());
// Hash all of the data.
reader.drop_eof()?;
let mut hashes =
mem::replace(&mut reader.cookie_mut().sig_group_mut().hashes,
Default::default());
let hashes = hashes.drain().collect();
Ok(hashes)
}
#[test]
fn hash_file_test() {
use std::collections::HashMap;
use std::fs::File;
let expected: HashMap<HashAlgorithm, &str> = [
(HashAlgorithm::SHA1, "7945E3DA269C25C04F9EF435A5C0F25D9662C771"),
(HashAlgorithm::SHA512, "DDE60DB05C3958AF1E576CD006A7F3D2C343DD8C8DECE789A15D148DF90E6E0D1454DE734F8343502CA93759F22C8F6221BE35B6BDE9728BD12D289122437CB1"),
].iter().cloned().collect();
let result =
hash_file(File::open(::path_to("a-cypherpunks-manifesto.txt")).unwrap(),
&expected.keys().cloned().collect::<Vec<HashAlgorithm>>())
.unwrap();
for (algo, mut hash) in result.into_iter() {
let mut digest = vec![0u8; hash.digest_size()];
hash.digest(&mut digest);
assert_eq!(*expected.get(&algo).unwrap(),
&::conversions::to_hex(&digest[..], false));
}
}
/// Time-constant comparison.
fn secure_cmp(a: &[u8], b: &[u8]) -> Ordering {
let ord1 = a.len().cmp(&b.len());
let ord2 = unsafe { memsec::memcmp(a.as_ptr(), b.as_ptr(), a.len()) };
let ord2 = match ord2 {
0 => Ordering::Equal,
a if a < 0 => Ordering::Less,
a if a > 0 => Ordering::Greater,
_ => unreachable!(),
};
if ord1 == Ordering::Equal { ord2 } else
|