1 files changed, 117 insertions, 0 deletions
diff --git a/vendor/crypto-bigint/src/wrapping.rs b/vendor/crypto-bigint/src/wrapping.rs
new file mode 100644
index 0000000..7ee6016
--- /dev/null
+++ b/vendor/crypto-bigint/src/wrapping.rs
@@ -0,0 +1,117 @@
+//! Wrapping arithmetic.
+
+use crate::Zero;
+use core::fmt;
+use subtle::{Choice, ConditionallySelectable, ConstantTimeEq};
+
+#[cfg(feature = "rand_core")]
+use {crate::Random, rand_core::CryptoRngCore};
+
+#[cfg(feature = "serde")]
+use serdect::serde::{Deserialize, Deserializer, Serialize, Serializer};
+
+/// Provides intentionally-wrapped arithmetic on `T`.
+///
+/// This is analogous to [`core::num::Wrapping`] but allows this crate to
+/// define trait impls for this type.
+#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, PartialOrd, Ord)]
+pub struct Wrapping<T>(pub T);
+
+impl<T: Zero> Zero for Wrapping<T> {
+    const ZERO: Self = Self(T::ZERO);
+}
+
+impl<T: fmt::Display> fmt::Display for Wrapping<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl<T: fmt::Binary> fmt::Binary for Wrapping<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl<T: fmt::Octal> fmt::Octal for Wrapping<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl<T: fmt::LowerHex> fmt::LowerHex for Wrapping<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl<T: fmt::UpperHex> fmt::UpperHex for Wrapping<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl<T: ConditionallySelectable> ConditionallySelectable for Wrapping<T> {
+    fn conditional_select(a: &Self, b: &Self, choice: Choice) -> Self {
+        Wrapping(T::conditional_select(&a.0, &b.0, choice))
+    }
+}
+
+impl<T: ConstantTimeEq> ConstantTimeEq for Wrapping<T> {
+    fn ct_eq(&self, other: &Self) -> Choice {
+        self.0.ct_eq(&other.0)
+    }
+}
+
+#[cfg(feature = "rand_core")]
+impl<T: Random> Random for Wrapping<T> {
+    fn random(rng: &mut impl CryptoRngCore) -> Self {
+        Wrapping(Random::random(rng))
+    }
+}
+
+#[cfg(feature = "serde")]
+impl<'de, T: Deserialize<'de>> Deserialize<'de> for Wrapping<T> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(Self(T::deserialize(deserializer)?))
+    }
+}
+
+#[cfg(feature = "serde")]
+impl<T: Serialize> Serialize for Wrapping<T> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        self.0.serialize(serializer)
+    }
+}
+
+#[cfg(all(test, feature = "serde"))]
+#[allow(clippy::unwrap_used)]
+mod tests {
+    use crate::{Wrapping, U64};
+
+    #[test]
+    fn serde() {
+        const TEST: Wrapping<U64> = Wrapping(U64::from_u64(0x0011223344556677));
+
+        let serialized = bincode::serialize(&TEST).unwrap();
+        let deserialized: Wrapping<U64> = bincode::deserialize(&serialized).unwrap();
+
+        assert_eq!(TEST, deserialized);
+    }
+
+    #[test]
+    fn serde_owned() {
+        const TEST: Wrapping<U64> = Wrapping(U64::from_u64(0x0011223344556677));
+
+        let serialized = bincode::serialize(&TEST).unwrap();
+        let deserialized: Wrapping<U64> = bincode::deserialize_from(serialized.as_slice()).unwrap();
+
+        assert_eq!(TEST, deserialized);
+    }
+}