1 files changed, 37 insertions, 0 deletions
diff --git a/vendor/crypto-bigint/src/uint/split.rs b/vendor/crypto-bigint/src/uint/split.rs
new file mode 100644
index 0000000..e690974
--- /dev/null
+++ b/vendor/crypto-bigint/src/uint/split.rs
@@ -0,0 +1,37 @@
+use crate::{Limb, Uint};
+
+/// Split this number in half, returning its high and low components
+/// respectively.
+#[inline]
+pub(crate) const fn split_mixed<const L: usize, const H: usize, const O: usize>(
+    n: &Uint<O>,
+) -> (Uint<H>, Uint<L>) {
+    let top = L + H;
+    let top = if top < O { top } else { O };
+    let mut lo = [Limb::ZERO; L];
+    let mut hi = [Limb::ZERO; H];
+    let mut i = 0;
+
+    while i < top {
+        if i < L {
+            lo[i] = n.limbs[i];
+        } else {
+            hi[i - L] = n.limbs[i];
+        }
+        i += 1;
+    }
+
+    (Uint { limbs: hi }, Uint { limbs: lo })
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{U128, U64};
+
+    #[test]
+    fn split() {
+        let (hi, lo) = U128::from_be_hex("00112233445566778899aabbccddeeff").split();
+        assert_eq!(hi, U64::from_u64(0x0011223344556677));
+        assert_eq!(lo, U64::from_u64(0x8899aabbccddeeff));
+    }
+}