generic-ec 0.5.0

General elliptic curve cryptography
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

use core::{fmt, ops};

use crate::{as_raw::AsRaw, core::ByteArray, Curve};

/// Bytes representation of an elliptic point
pub struct EncodedPoint<E: Curve>(EncodedPointInner<E>);

impl<E: Curve> EncodedPoint<E> {
    pub(crate) fn new_compressed(bytes: E::CompressedPointArray) -> Self {
        Self(EncodedPointInner::Compressed(bytes))
    }

    pub(crate) fn new_uncompressed(bytes: E::UncompressedPointArray) -> Self {
        Self(EncodedPointInner::Uncompressed(bytes))
    }

    /// Returns bytes representation of the point
    pub fn as_bytes(&self) -> &[u8] {
        match &self.0 {
            EncodedPointInner::Compressed(bytes) => bytes.as_ref(),
            EncodedPointInner::Uncompressed(bytes) => bytes.as_ref(),
        }
    }
}

impl<E: Curve> Clone for EncodedPoint<E> {
    fn clone(&self) -> Self {
        Self(self.0.clone())
    }
}

impl<E: Curve> PartialEq for EncodedPoint<E> {
    fn eq(&self, other: &Self) -> bool {
        self.as_bytes() == other.as_bytes()
    }
}

impl<E: Curve> Eq for EncodedPoint<E> {}

impl<E: Curve> fmt::Debug for EncodedPoint<E> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut tuple = f.debug_tuple("EncodedPoint");
        #[cfg(feature = "alloc")]
        {
            tuple.field(&hex::encode(self.as_bytes()));
        }
        tuple.finish()
    }
}

impl<E: Curve> ops::Deref for EncodedPoint<E> {
    type Target = [u8];
    fn deref(&self) -> &[u8] {
        self.as_bytes()
    }
}

#[derive(Clone)]
enum EncodedPointInner<E: Curve> {
    Compressed(E::CompressedPointArray),
    Uncompressed(E::UncompressedPointArray),
}

impl<E: Curve> AsRef<[u8]> for EncodedPoint<E> {
    fn as_ref(&self) -> &[u8] {
        self.as_bytes()
    }
}

/// Bytes representation of a scalar (either in big-endian or in little-endian)
#[derive(Clone)]
pub struct EncodedScalar<E: Curve>(E::ScalarArray);

impl<E: Curve> EncodedScalar<E> {
    pub(crate) fn new(bytes: E::ScalarArray) -> Self {
        Self(bytes)
    }

    /// Returns bytes representation of a scalar
    pub fn as_bytes(&self) -> &[u8] {
        self.0.as_ref()
    }
}

impl<E: Curve> AsRef<[u8]> for EncodedScalar<E> {
    fn as_ref(&self) -> &[u8] {
        self.as_bytes()
    }
}

impl<E: Curve> AsMut<[u8]> for EncodedScalar<E> {
    fn as_mut(&mut self) -> &mut [u8] {
        self.0.as_mut()
    }
}

impl<E: Curve> ops::Deref for EncodedScalar<E> {
    type Target = [u8];
    fn deref(&self) -> &[u8] {
        self.as_bytes()
    }
}

impl<E: Curve> fmt::Debug for EncodedScalar<E> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut s = f.debug_tuple("EncodedScalar");
        #[cfg(feature = "std")]
        {
            s.field(&hex::encode(self.as_bytes()));
        }
        s.finish()
    }
}

impl<E: Curve> PartialEq for EncodedScalar<E> {
    fn eq(&self, other: &Self) -> bool {
        self.as_bytes() == other.as_bytes()
    }
}

impl<E: Curve> Eq for EncodedScalar<E> {}

impl<E: Curve> Default for EncodedScalar<E> {
    fn default() -> Self {
        let bytes = E::ScalarArray::zeroes();
        Self(bytes)
    }
}

impl<E: Curve> AsRaw for EncodedScalar<E> {
    type Raw = E::ScalarArray;
    fn as_raw(&self) -> &Self::Raw {
        &self.0
    }
}