adds round_two napi binding for frost signing (#4559)

ironfish-rust-nodejs/src/frost.rs

@@ -3,9 +3,13 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 use ironfish::{
-    frost::keys::KeyPackage,
-    frost_utils::round_one::round_one as round_one_rust,
-    serializing::{bytes_to_hex, hex_to_vec_bytes},
+    frost::{
+        keys::KeyPackage,
+        round2::{Randomizer, SignatureShare},
+        SigningPackage,
+    },
+    frost_utils::{round_one::round_one as round_one_rust, round_two::round_two as round_two_rust},
+    serializing::{bytes_to_hex, hex_to_bytes, hex_to_vec_bytes},
 };
 use napi::bindgen_prelude::*;
 use napi_derive::napi;
@@ -33,3 +37,21 @@ pub fn round_one(key_package: String, seed: u32) -> Result<RoundOneSigningData>
         commitment_binding: bytes_to_hex(&commitment.binding().serialize()),
     })
 }
+
+pub fn round_two(
+    signing_package: String,
+    key_package: String,
+    public_key_randomness: String,
+    seed: u64,
+) -> Result<SignatureShare> {
+    let key_package =
+        KeyPackage::deserialize(&hex_to_vec_bytes(&key_package).map_err(to_napi_err)?[..])
+            .map_err(to_napi_err)?;
+    let signing_package =
+        SigningPackage::deserialize(&hex_to_vec_bytes(&signing_package).map_err(to_napi_err)?[..])
+            .map_err(to_napi_err)?;
+    let randomizer =
+        Randomizer::deserialize(&hex_to_bytes(&public_key_randomness).map_err(to_napi_err)?)
+            .map_err(to_napi_err)?;
+    round_two_rust(signing_package, key_package, randomizer, seed).map_err(to_napi_err)
+}