diff --git a/src/e2f/mod.rs b/src/e2f/mod.rs
index 6d49ad3..798eff7 100644
--- a/src/e2f/mod.rs
+++ b/src/e2f/mod.rs
@@ -3,7 +3,7 @@
 mod prover;
 mod verifier;
 
-use crate::ole::Ole;
+use crate::func::ole::Ole;
 use mpz_share_conversion_core::fields::p256::P256;
 pub use prover::Prover;
 pub use verifier::Verifier;
diff --git a/src/e2f/prover.rs b/src/e2f/prover.rs
index 7b89c14..11915e4 100644
--- a/src/e2f/prover.rs
+++ b/src/e2f/prover.rs
@@ -1,6 +1,6 @@
 //! The prover implementation
 
-use crate::ole::{Ole, Role};
+use crate::func::ole::{Ole, Role};
 use mpz_share_conversion_core::fields::{p256::P256, Field, UniformRand};
 use rand::thread_rng;
 
diff --git a/src/e2f/verifier.rs b/src/e2f/verifier.rs
index 2e84405..8e37b77 100644
--- a/src/e2f/verifier.rs
+++ b/src/e2f/verifier.rs
@@ -1,6 +1,6 @@
 //! The verifier implementation
 
-use crate::ole::{Ole, Role};
+use crate::func::ole::{Ole, Role};
 use mpz_share_conversion_core::fields::{p256::P256, Field, UniformRand};
 use rand::thread_rng;
 
diff --git a/src/func/mod.rs b/src/func/mod.rs
new file mode 100644
index 0000000..d51b217
--- /dev/null
+++ b/src/func/mod.rs
@@ -0,0 +1,3 @@
+//! This module implements some functionalities.
+
+pub mod ole;
diff --git a/src/ole.rs b/src/func/ole.rs
similarity index 100%
rename from src/ole.rs
rename to src/func/ole.rs
diff --git a/src/ghash/mod.rs b/src/ghash/mod.rs
index 41e51a3..73ba694 100644
--- a/src/ghash/mod.rs
+++ b/src/ghash/mod.rs
@@ -3,12 +3,11 @@
 mod prover;
 mod verifier;
 
+use crate::func::ole::Ole;
 use mpz_share_conversion_core::{fields::gf2_128::Gf2_128, Field};
 pub use prover::Prover;
 pub use verifier::Verifier;
 
-use crate::ole::Ole;
-
 pub fn ghash(blocks: &[Gf2_128], prover: &mut Prover, verifier: &mut Verifier) -> Gf2_128 {
     let mut ole = Ole::default();
 
diff --git a/src/ghash/prover.rs b/src/ghash/prover.rs
index 2c7fcec..e49264c 100644
--- a/src/ghash/prover.rs
+++ b/src/ghash/prover.rs
@@ -1,5 +1,5 @@
 use super::pascal_tri;
-use crate::ole::{Ole, Role};
+use crate::func::ole::{Ole, Role};
 use mpz_share_conversion_core::{
     fields::{compute_product_repeated, gf2_128::Gf2_128, UniformRand},
     Field,
diff --git a/src/ghash/verifier.rs b/src/ghash/verifier.rs
index a4c88c7..b4c8f0c 100644
--- a/src/ghash/verifier.rs
+++ b/src/ghash/verifier.rs
@@ -1,5 +1,5 @@
 use super::pascal_tri;
-use crate::ole::{Ole, Role};
+use crate::func::ole::{Ole, Role};
 use mpz_share_conversion_core::{
     fields::{compute_product_repeated, gf2_128::Gf2_128, UniformRand},
     Field,
diff --git a/src/lib.rs b/src/lib.rs
index e121b1d..f1929f3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,5 +2,5 @@
 #![feature(iter_map_windows)]
 
 pub mod e2f;
+mod func;
 pub mod ghash;
-mod ole;