crypto_bigint/int/
bit_and.rs

1//! [`Int`] bitwise AND operations.
2
3use core::ops::{BitAnd, BitAndAssign};
4
5use crate::{CtOption, Int, Limb, Uint};
6
7impl<const LIMBS: usize> Int<LIMBS> {
8    /// Computes bitwise `a & b`.
9    #[inline(always)]
10    #[must_use]
11    pub const fn bitand(&self, rhs: &Self) -> Self {
12        Self(Uint::bitand(&self.0, &rhs.0))
13    }
14
15    /// Perform bitwise `AND` between `self` and the given [`Limb`], performing the `AND` operation
16    /// on every limb of `self`.
17    #[must_use]
18    pub const fn bitand_limb(&self, rhs: Limb) -> Self {
19        Self(Uint::bitand_limb(&self.0, rhs))
20    }
21
22    /// Perform wrapping bitwise `AND`.
23    ///
24    /// There's no way wrapping could ever happen.
25    /// This function exists so that all operations are accounted for in the wrapping operations
26    #[must_use]
27    pub const fn wrapping_and(&self, rhs: &Self) -> Self {
28        self.bitand(rhs)
29    }
30
31    /// Perform checked bitwise `AND`, returning a [`CtOption`] which `is_some` always
32    #[must_use]
33    pub const fn checked_and(&self, rhs: &Self) -> CtOption<Self> {
34        CtOption::some(self.bitand(rhs))
35    }
36}
37
38impl<const LIMBS: usize> BitAnd for Int<LIMBS> {
39    type Output = Self;
40
41    fn bitand(self, rhs: Self) -> Int<LIMBS> {
42        self.bitand(&rhs)
43    }
44}
45
46impl<const LIMBS: usize> BitAnd<&Int<LIMBS>> for Int<LIMBS> {
47    type Output = Int<LIMBS>;
48
49    #[allow(clippy::needless_borrow)]
50    fn bitand(self, rhs: &Int<LIMBS>) -> Int<LIMBS> {
51        (&self).bitand(rhs)
52    }
53}
54
55impl<const LIMBS: usize> BitAnd<Int<LIMBS>> for &Int<LIMBS> {
56    type Output = Int<LIMBS>;
57
58    fn bitand(self, rhs: Int<LIMBS>) -> Int<LIMBS> {
59        self.bitand(&rhs)
60    }
61}
62
63impl<const LIMBS: usize> BitAnd<&Int<LIMBS>> for &Int<LIMBS> {
64    type Output = Int<LIMBS>;
65
66    fn bitand(self, rhs: &Int<LIMBS>) -> Int<LIMBS> {
67        self.bitand(rhs)
68    }
69}
70
71impl<const LIMBS: usize> BitAndAssign for Int<LIMBS> {
72    #[allow(clippy::assign_op_pattern)]
73    fn bitand_assign(&mut self, other: Self) {
74        *self = *self & other;
75    }
76}
77
78impl<const LIMBS: usize> BitAndAssign<&Int<LIMBS>> for Int<LIMBS> {
79    #[allow(clippy::assign_op_pattern)]
80    fn bitand_assign(&mut self, other: &Self) {
81        *self = *self & other;
82    }
83}
84
85#[cfg(test)]
86mod tests {
87    use crate::I128;
88
89    #[test]
90    fn checked_and_ok() {
91        assert_eq!(I128::ZERO.checked_and(&I128::ONE).unwrap(), I128::ZERO);
92        assert_eq!(I128::ONE.checked_and(&I128::ONE).unwrap(), I128::ONE);
93        assert_eq!(I128::MAX.checked_and(&I128::ONE).unwrap(), I128::ONE);
94    }
95
96    #[test]
97    fn wrapping_and_ok() {
98        assert_eq!(I128::ZERO.wrapping_and(&I128::ONE), I128::ZERO);
99        assert_eq!(I128::ONE.wrapping_and(&I128::ONE), I128::ONE);
100        assert_eq!(I128::MAX.wrapping_and(&I128::ONE), I128::ONE);
101    }
102}
crypto_bigint/int/bit_and.rs

crypto_bigint/int/
bit_and.rs
