1 files changed, 67 insertions, 0 deletions
diff --git a/vendor/crypto-bigint/src/limb/encoding.rs b/vendor/crypto-bigint/src/limb/encoding.rs
new file mode 100644
index 000000000..39974b061
--- /dev/null
+++ b/vendor/crypto-bigint/src/limb/encoding.rs
@@ -0,0 +1,67 @@
+//! Limb encoding
+
+use super::{Limb, Word};
+use crate::Encoding;
+
+impl Encoding for Limb {
+    const BIT_SIZE: usize = Self::BIT_SIZE;
+    const BYTE_SIZE: usize = Self::BYTE_SIZE;
+
+    #[cfg(target_pointer_width = "32")]
+    type Repr = [u8; 4];
+    #[cfg(target_pointer_width = "64")]
+    type Repr = [u8; 8];
+
+    #[inline]
+    fn from_be_bytes(bytes: Self::Repr) -> Self {
+        Limb(Word::from_be_bytes(bytes))
+    }
+
+    #[inline]
+    fn from_le_bytes(bytes: Self::Repr) -> Self {
+        Limb(Word::from_le_bytes(bytes))
+    }
+
+    #[inline]
+    fn to_be_bytes(&self) -> Self::Repr {
+        self.0.to_be_bytes()
+    }
+
+    #[inline]
+    fn to_le_bytes(&self) -> Self::Repr {
+        self.0.to_le_bytes()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use proptest::prelude::*;
+
+    prop_compose! {
+        fn limb()(inner in any::<Word>()) -> Limb {
+            Limb(inner)
+        }
+    }
+
+    proptest! {
+        #[test]
+        fn roundtrip(a in limb()) {
+            assert_eq!(a, Limb::from_be_bytes(a.to_be_bytes()));
+            assert_eq!(a, Limb::from_le_bytes(a.to_le_bytes()));
+        }
+    }
+
+    proptest! {
+        #[test]
+        fn reverse(a in limb()) {
+            let mut bytes = a.to_be_bytes();
+            bytes.reverse();
+            assert_eq!(a, Limb::from_le_bytes(bytes));
+
+            let mut bytes = a.to_le_bytes();
+            bytes.reverse();
+            assert_eq!(a, Limb::from_be_bytes(bytes));
+        }
+    }
+}