fix nits

crypto/Cargo.toml

@@ -1,12 +1,20 @@
 [package]
 name = "crypto"
 version = "0.1.0"
+description="Miden Cryptographic primitives"
+authors = ["miden contributors"]
+readme="README.md"
+license = "MIT"
+repository = "https://github.com/0xPolygonMiden/crypto"
+categories = ["cryptography", "no-std"]
+keywords = ["miden", "crypto", "hash", "merkle"]
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 winterfell = { git = "https://github.com/novifinancial/winterfell"}
 winter_utils = { version = "0.4", package = "winter-utils" }
 rand_utils = { version = "0.4", package = "winter-rand-utils" }
-proptest = "1.0.0"
+
+
+[dev-dependencies]
+proptest = "1.0.0"

crypto/src/hash/mod.rs

@@ -1 +1,32 @@
+use winterfell::crypto::{ElementHasher};
+use winterfell::math::StarkField;
+use winterfell::crypto::Hasher as HashFn;
+use winterfell::crypto::hashers::Rp64_256 as Hasher;
 
+mod rpo;
+pub use rpo::Rpo;
+
+
+// TYPE ALIASES
+// ================================================================================================
+
+pub type Digest = <Hasher as HashFn>::Digest;
+
+
+// HELPER FUNCTIONS
+// ================================================================================================
+
+#[inline(always)]
+fn exp_acc<B: StarkField, const N: usize, const M: usize>(base: [B; N], tail: [B; N]) -> [B; N] {
+    let mut result = base;
+    for _ in 0..M {
+        result.iter_mut().for_each(|r| *r = r.square());
+    }
+    result.iter_mut().zip(tail).for_each(|(r, t)| *r *= t);
+    result
+}
+
+#[inline(always)]
+pub fn merge(values: &[Digest; 2]) -> Digest {
+    Hasher::merge(values)
+}

crypto/src/merkle/merkle_path_set.rs

@@ -1,6 +1,7 @@
-use std::collections::BTreeMap;
+use winter_utils::collections::BTreeMap;
 
-use super::{merge, Felt, FieldElement, MerkleError, Word};
+use super::{Felt, FieldElement, MerkleError, Word};
+use crate::hash::merge;
 
 // MERKLE PATH SET
 // ================================================================================================

crypto/src/merkle/merkle_tree.rs

@@ -1,12 +1,9 @@
 use core::slice;
-
-use super::Digest;
 use winter_utils::uninit_vector;
 use winterfell::math::log2;
 
-use crate::{Felt, FieldElement, Word};
-
-use super::{merge, MerkleError};
+use crate::{Felt, FieldElement, Word, hash::{merge,Digest}};
+use super::MerkleError;
 
 // MERKLE TREE
 // ================================================================================================

crypto/src/merkle/mod.rs

@@ -1,28 +1,8 @@
 pub mod merkle_path_set;
 pub mod merkle_tree;
 
-use winterfell::crypto::Hasher as HashFn;
+use crate::{Felt, FieldElement, Word};
 
-pub use winterfell::crypto::hashers::Rp64_256 as Hasher;
-pub use winterfell::math::{
-    fields::{f64::BaseElement as Felt, QuadExtension},
-    ExtensionOf, FieldElement, StarkField,
-};
-
-// TYPE ALIASES
-// ================================================================================================
-
-pub type Word = [Felt; 4];
-pub type Digest = <Hasher as HashFn>::Digest;
-
-// PASS-THROUGH FUNCTIONS
-// ================================================================================================
-
-/// Returns a hash of two digests. This method is intended for use in construction of Merkle trees.
-#[inline(always)]
-pub fn merge(values: &[Digest; 2]) -> Digest {
-    Hasher::merge(values)
-}
 
 // ERRORS
 // ================================================================================================