[go: up one dir, main page]

seckey 0.7.0

Use `memsec` protected secret memory.
Documentation 
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

use std::fmt;
use std::cmp::{ Ordering, min };
use std::iter::repeat;
use std::ops::{ Deref, DerefMut };
use memsec::{ memeq, memcmp, mlock, munlock };


/// Temporary Bytes.
///
/// ```
/// use seckey::Bytes;
///
/// let bytes = Bytes::new(&[8; 8]);
///
/// assert_eq!(bytes, [8; 8]);
/// ```
#[derive(Default)]
pub struct Bytes(Vec<u8>);

impl Bytes {
    /// Create a new Bytes.
    #[inline]
    pub fn new(input: &[u8]) -> Bytes {
        Bytes::from(Vec::from(input))
    }

    /// Create a empty Bytes.
    #[inline]
    pub fn empty() -> Bytes {
        Self::default()
    }
}

impl From<Vec<u8>> for Bytes {
    #[inline]
    fn from(mut t: Vec<u8>) -> Bytes {
        unsafe { mlock(t.as_mut_ptr(), t.len()) };
        Bytes(t)
    }
}

impl<'a> From<&'a [u8]> for Bytes {
    #[inline]
    fn from(t: &'a [u8]) -> Bytes {
        Bytes::new(t)
    }
}

impl Deref for Bytes {
    type Target = [u8];
    #[inline]
    fn deref(&self) -> &[u8] {
        self.0.as_slice()
    }
}

impl DerefMut for Bytes {
    #[inline]
    fn deref_mut(&mut self) -> &mut [u8] {
        self.0.as_mut_slice()
    }
}

impl Clone for Bytes {
    fn clone(&self) -> Bytes {
        Bytes::from(self.0.clone())
    }
}

impl fmt::Debug for Bytes {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let mut fmt = f.debug_tuple("Bytes");
        match self.len() {
            0 => fmt.finish(),
            len @ 1...32 => fmt
                .field(&repeat('*').take(len).collect::<String>())
                .finish(),
            len => fmt.field(&len).finish()
        }
    }
}

impl AsRef<[u8]> for Bytes {
    #[inline]
    fn as_ref(&self) -> &[u8] {
        self.deref()
    }
}

impl<A: AsRef<[u8]>> PartialEq<A> for Bytes {
    #[inline]
    fn eq(&self, rhs: &A) -> bool {
        self.eq(rhs.as_ref())
    }
}

impl PartialEq<[u8]> for Bytes {
    /// Constant time eq.
    fn eq(&self, rhs: &[u8]) -> bool {
        let minlen = min(self.len(), rhs.len());
        let output =
            unsafe { memeq(self.as_ptr(), rhs.as_ptr(), minlen) };

        self.len() == rhs.len() && output
    }
}

impl Eq for Bytes {}

impl<A: AsRef<[u8]>> PartialOrd<A> for Bytes {
    #[inline]
    fn partial_cmp(&self, rhs: &A) -> Option<Ordering> {
        self.partial_cmp(rhs.as_ref())
    }
}

impl PartialOrd<[u8]> for Bytes {
    /// Constant time cmp.
    fn partial_cmp(&self, rhs: &[u8]) -> Option<Ordering> {
        let minlen = min(self.len(), rhs.len());
        let order =
            unsafe { memcmp(self.as_ptr(), rhs.as_ptr(), minlen) };
        if order == 0 {
            Some(self.len().cmp(&rhs.len()))
        } else if order < 0 {
            Some(Ordering::Less)
        } else {
            Some(Ordering::Greater)
        }
    }
}

impl Ord for Bytes {
    #[inline]
    fn cmp(&self, rhs: &Bytes) -> Ordering {
        self.partial_cmp(rhs.as_ref()).unwrap()
    }
}

impl Drop for Bytes {
    fn drop(&mut self) {
        unsafe { munlock(self.0.as_mut_ptr(), self.0.len()) };
    }
}