chore(ipa-multipoint): switch to LE bytes

ipa-multipoint/ipa_multipoint_jni/src/lib.rs

@@ -78,19 +78,15 @@ pub extern "system" fn Java_org_hyperledger_besu_nativelib_ipamultipoint_LibIpaM
     _class: JClass<'_>,
     input: jbyteArray,
 ) -> jbyteArray {
-    let mut input = env
+    let input = env
         .convert_byte_array(input)
         .expect("Cannot convert jbyteArray to rust array");
 
     let committer = &CONFIG.committer;
 
-    reverse_scalars_endian(&mut input);
     let commitment = ffi_interface::commit_to_scalars(committer, &input).unwrap();
 
-    let mut hash = ffi_interface::hash_commitment(commitment);
-    // TODO(Big-Endian): The output of `hash_commitment` is a scalar serialized
-    // TODO(Big-Endian): in little endian. The previous implementation used big endian.
-    hash.reverse();
+    let hash = ffi_interface::hash_commitment(commitment);
 
     env.byte_array_from_slice(&hash)
         .expect("Couldn't convert to byte array")
@@ -104,27 +100,15 @@ pub extern "system" fn Java_org_hyperledger_besu_nativelib_ipamultipoint_LibIpaM
     _class: JClass<'_>,
     input: jbyteArray,
 ) -> jbyteArray {
-    let mut input = env
+    let input = env
         .convert_byte_array(input)
         .expect("Cannot convert jbyteArray to rust array");
 
     let committer = &CONFIG.committer;
-    reverse_scalars_endian(&mut input);
 
     let commitment = ffi_interface::commit_to_scalars(committer, &input).unwrap();
     let hash = ffi_interface::deprecated_serialize_commitment(commitment);
 
     env.byte_array_from_slice(&hash)
         .expect("Couldn't convert to byte array")
 }
-
-// TODO(Big-Endian): rust-verkle now uses Little-Endian for scalars.
-// TODO(Big-Endian): We switch the endianness here to match the old implementation.
-// TODO(Big-Endian): Doing the switch here allows use to restrict the changes to just this part of the code, until
-// TODO(Big-Endian): we are ready to change besu-verkle and other parts of the code to use little endian input.
-fn reverse_scalars_endian(scalars: &mut [u8]) {
-    const SCALAR_SIZE: usize = 32;
-    for scalar in scalars.chunks_exact_mut(SCALAR_SIZE) {
-        scalar.reverse();
-    }
-}