crypto_bigint/limb/
encoding.rs

1//! Limb encoding
2
3use super::{Limb, Word};
4use crate::Encoding;
5
6impl Encoding for Limb {
7    #[cfg(target_pointer_width = "32")]
8    type Repr = [u8; 4];
9    #[cfg(target_pointer_width = "64")]
10    type Repr = [u8; 8];
11
12    #[inline]
13    fn from_be_bytes(bytes: Self::Repr) -> Self {
14        Limb(Word::from_be_bytes(bytes))
15    }
16
17    #[inline]
18    fn from_le_bytes(bytes: Self::Repr) -> Self {
19        Limb(Word::from_le_bytes(bytes))
20    }
21
22    #[inline]
23    fn to_be_bytes(&self) -> Self::Repr {
24        self.0.to_be_bytes()
25    }
26
27    #[inline]
28    fn to_le_bytes(&self) -> Self::Repr {
29        self.0.to_le_bytes()
30    }
31}
32
33#[cfg(test)]
34mod test {
35    use super::*;
36    use proptest::prelude::*;
37
38    prop_compose! {
39        fn limb()(inner in any::<Word>()) -> Limb {
40            Limb(inner)
41        }
42    }
43
44    proptest! {
45        #[test]
46        fn roundtrip(a in limb()) {
47            assert_eq!(a, Limb::from_be_bytes(a.to_be_bytes()));
48            assert_eq!(a, Limb::from_le_bytes(a.to_le_bytes()));
49        }
50    }
51
52    proptest! {
53        #[test]
54        fn reverse(a in limb()) {
55            let mut bytes = a.to_be_bytes();
56            bytes.reverse();
57            assert_eq!(a, Limb::from_le_bytes(bytes));
58
59            let mut bytes = a.to_le_bytes();
60            bytes.reverse();
61            assert_eq!(a, Limb::from_be_bytes(bytes));
62        }
63    }
64}
crypto_bigint/limb/encoding.rs

crypto_bigint/limb/
encoding.rs
