1 files changed, 14 insertions, 0 deletions
diff --git a/vendor/crypto-bigint/src/uint/modular/inv.rs b/vendor/crypto-bigint/src/uint/modular/inv.rs
new file mode 100644
index 000000000..408c03fb8
--- /dev/null
+++ b/vendor/crypto-bigint/src/uint/modular/inv.rs
@@ -0,0 +1,14 @@
+use crate::{modular::reduction::montgomery_reduction, CtChoice, Limb, Uint};
+
+pub const fn inv_montgomery_form<const LIMBS: usize>(
+    x: &Uint<LIMBS>,
+    modulus: &Uint<LIMBS>,
+    r3: &Uint<LIMBS>,
+    mod_neg_inv: Limb,
+) -> (Uint<LIMBS>, CtChoice) {
+    let (inverse, is_some) = x.inv_odd_mod(modulus);
+    (
+        montgomery_reduction(&inverse.mul_wide(r3), modulus, mod_neg_inv),
+        is_some,
+    )
+}