Merging upstream version 1.70.0+dfsg2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 145 insertions, 0 deletions

diff --git a/vendor/crypto-bigint/src/uint/bit_and.rs b/vendor/crypto-bigint/src/uint/bit_and.rs
new file mode 100644
index 000000000..cab89a429
--- /dev/null
+++ b/vendor/crypto-bigint/src/uint/bit_and.rs
@@ -0,0 +1,145 @@
+//! [`UInt`] bitwise and operations.
+
+use super::UInt;
+use crate::{Limb, Wrapping};
+use core::ops::{BitAnd, BitAndAssign};
+use subtle::{Choice, CtOption};
+
+impl<const LIMBS: usize> UInt<LIMBS> {
+    /// Computes bitwise `a & b`.
+    #[inline(always)]
+    pub const fn bitand(&self, rhs: &Self) -> Self {
+        let mut limbs = [Limb::ZERO; LIMBS];
+        let mut i = 0;
+
+        while i < LIMBS {
+            limbs[i] = self.limbs[i].bitand(rhs.limbs[i]);
+            i += 1;
+        }
+
+        Self { limbs }
+    }
+
+    /// Perform wrapping bitwise `AND`.
+    ///
+    /// There's no way wrapping could ever happen.
+    /// This function exists so that all operations are accounted for in the wrapping operations
+    pub const fn wrapping_and(&self, rhs: &Self) -> Self {
+        self.bitand(rhs)
+    }
+
+    /// Perform checked bitwise `AND`, returning a [`CtOption`] which `is_some` always
+    pub fn checked_and(&self, rhs: &Self) -> CtOption<Self> {
+        let result = self.bitand(rhs);
+        CtOption::new(result, Choice::from(1))
+    }
+}
+
+impl<const LIMBS: usize> BitAnd for UInt<LIMBS> {
+    type Output = Self;
+
+    fn bitand(self, rhs: Self) -> UInt<LIMBS> {
+        self.bitand(&rhs)
+    }
+}
+
+impl<const LIMBS: usize> BitAnd<&UInt<LIMBS>> for UInt<LIMBS> {
+    type Output = UInt<LIMBS>;
+
+    fn bitand(self, rhs: &UInt<LIMBS>) -> UInt<LIMBS> {
+        (&self).bitand(rhs)
+    }
+}
+
+impl<const LIMBS: usize> BitAnd<UInt<LIMBS>> for &UInt<LIMBS> {
+    type Output = UInt<LIMBS>;
+
+    fn bitand(self, rhs: UInt<LIMBS>) -> UInt<LIMBS> {
+        self.bitand(&rhs)
+    }
+}
+
+impl<const LIMBS: usize> BitAnd<&UInt<LIMBS>> for &UInt<LIMBS> {
+    type Output = UInt<LIMBS>;
+
+    fn bitand(self, rhs: &UInt<LIMBS>) -> UInt<LIMBS> {
+        self.bitand(rhs)
+    }
+}
+
+impl<const LIMBS: usize> BitAndAssign for UInt<LIMBS> {
+    #[allow(clippy::assign_op_pattern)]
+    fn bitand_assign(&mut self, other: Self) {
+        *self = *self & other;
+    }
+}
+
+impl<const LIMBS: usize> BitAndAssign<&UInt<LIMBS>> for UInt<LIMBS> {
+    #[allow(clippy::assign_op_pattern)]
+    fn bitand_assign(&mut self, other: &Self) {
+        *self = *self & other;
+    }
+}
+
+impl<const LIMBS: usize> BitAnd for Wrapping<UInt<LIMBS>> {
+    type Output = Self;
+
+    fn bitand(self, rhs: Self) -> Wrapping<UInt<LIMBS>> {
+        Wrapping(self.0.bitand(&rhs.0))
+    }
+}
+
+impl<const LIMBS: usize> BitAnd<&Wrapping<UInt<LIMBS>>> for Wrapping<UInt<LIMBS>> {
+    type Output = Wrapping<UInt<LIMBS>>;
+
+    fn bitand(self, rhs: &Wrapping<UInt<LIMBS>>) -> Wrapping<UInt<LIMBS>> {
+        Wrapping(self.0.bitand(&rhs.0))
+    }
+}
+
+impl<const LIMBS: usize> BitAnd<Wrapping<UInt<LIMBS>>> for &Wrapping<UInt<LIMBS>> {
+    type Output = Wrapping<UInt<LIMBS>>;
+
+    fn bitand(self, rhs: Wrapping<UInt<LIMBS>>) -> Wrapping<UInt<LIMBS>> {
+        Wrapping(self.0.bitand(&rhs.0))
+    }
+}
+
+impl<const LIMBS: usize> BitAnd<&Wrapping<UInt<LIMBS>>> for &Wrapping<UInt<LIMBS>> {
+    type Output = Wrapping<UInt<LIMBS>>;
+
+    fn bitand(self, rhs: &Wrapping<UInt<LIMBS>>) -> Wrapping<UInt<LIMBS>> {
+        Wrapping(self.0.bitand(&rhs.0))
+    }
+}
+
+impl<const LIMBS: usize> BitAndAssign for Wrapping<UInt<LIMBS>> {
+    #[allow(clippy::assign_op_pattern)]
+    fn bitand_assign(&mut self, other: Self) {
+        *self = *self & other;
+    }
+}
+
+impl<const LIMBS: usize> BitAndAssign<&Wrapping<UInt<LIMBS>>> for Wrapping<UInt<LIMBS>> {
+    #[allow(clippy::assign_op_pattern)]
+    fn bitand_assign(&mut self, other: &Self) {
+        *self = *self & other;
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::U128;
+
+    #[test]
+    fn checked_and_ok() {
+        let result = U128::ZERO.checked_and(&U128::ONE);
+        assert_eq!(result.unwrap(), U128::ZERO);
+    }
+
+    #[test]
+    fn overlapping_and_ok() {
+        let result = U128::MAX.wrapping_and(&U128::ONE);
+        assert_eq!(result, U128::ONE);
+    }
+}