diff --git a/crypto/src/hash/mod.rs b/crypto/src/hash/mod.rs
index 2337fe1..dec2761 100644
--- a/crypto/src/hash/mod.rs
+++ b/crypto/src/hash/mod.rs
@@ -2,6 +2,7 @@ use crate::{ElementHasher, HashFn};
 
 mod rpo;
 pub use rpo::Rpo256 as Hasher;
+pub use rpo::{INV_MDS, MDS};
 
 // TYPE ALIASES
 // ================================================================================================
diff --git a/crypto/src/hash/rpo/digest.rs b/crypto/src/hash/rpo/digest.rs
index f1ae3c2..3eef96f 100644
--- a/crypto/src/hash/rpo/digest.rs
+++ b/crypto/src/hash/rpo/digest.rs
@@ -94,33 +94,6 @@ impl Deref for RpoDigest256 {
     }
 }
 
-impl RpoDigest256 {
-    fn iter(&self) -> RpoDigest256Iter<'_> {
-        RpoDigest256Iter {
-            values: &self.0,
-            index: 0,
-        }
-    }
-}
-
-pub struct RpoDigest256Iter<'a> {
-    values: &'a [Felt; DIGEST_SIZE],
-    index: usize,
-}
-
-impl<'a> Iterator for RpoDigest256Iter<'a> {
-    type Item = &'a Felt;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        if self.index >= self.values.len() {
-            return None;
-        }
-
-        self.index += 1;
-        Some(&self.values[self.index - 1])
-    }
-}
-
 // TESTS
 // ================================================================================================
 
diff --git a/crypto/src/hash/rpo/mod.rs b/crypto/src/hash/rpo/mod.rs
index 720e7d2..5a88eb8 100644
--- a/crypto/src/hash/rpo/mod.rs
+++ b/crypto/src/hash/rpo/mod.rs
@@ -378,7 +378,7 @@ impl Rpo256 {
 // MDS
 // ================================================================================================
 /// RPO MDS matrix
-const MDS: [[Felt; STATE_WIDTH]; STATE_WIDTH] = [
+pub const MDS: [[Felt; STATE_WIDTH]; STATE_WIDTH] = [
     [
         Felt::new(7),
         Felt::new(23),
@@ -550,7 +550,7 @@ const MDS: [[Felt; STATE_WIDTH]; STATE_WIDTH] = [
 ];
 
 /// RPO Inverse MDS matrix
-const INV_MDS: [[Felt; STATE_WIDTH]; STATE_WIDTH] = [
+pub const INV_MDS: [[Felt; STATE_WIDTH]; STATE_WIDTH] = [
     [
         Felt::new(14868391535953158196),
         Felt::new(13278298489594233127),
diff --git a/crypto/src/merkle/mod.rs b/crypto/src/merkle/mod.rs
index 6c8819b..63e5488 100644
--- a/crypto/src/merkle/mod.rs
+++ b/crypto/src/merkle/mod.rs
@@ -1,4 +1,7 @@
-use crate::{Felt, Word, ZERO};
+use crate::Word;
+
+#[cfg(test)]
+use crate::{Felt, ZERO};
 
 pub mod merkle_path_set;
 pub mod merkle_tree;