use digest function

crates/primitives/src/eip4844.rs

@@ -1,7 +1,16 @@
 //! Helpers for working with EIP-4844 blob fee
+use crate::{kzg::KzgCommitment, H256, constants::eip4844::{TARGET_DATA_GAS_PER_BLOCK, VERSIONED_HASH_VERSION_KZG}};
+
+/// Calculates the versioned hash for a KzgCommitment
+///
+/// Specified in [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844#header-extension)
+pub fn kzg_to_versioned_hash(commitment: KzgCommitment) -> H256 {
+    use sha2::{Sha256, Digest};
+    let mut res = Sha256::digest(commitment.as_slice());
+    res[0] = VERSIONED_HASH_VERSION_KZG;
+    H256::from_slice(&res)
+}
 
-use crate::{H256, constants::eip4844::{TARGET_DATA_GAS_PER_BLOCK, VERSIONED_HASH_VERSION_KZG}};
-use c_kzg::KzgCommitment;
 /// Calculates the excess data gas for the next block, after applying the current set of blobs on
 /// top of the excess data gas.
 ///
@@ -10,15 +19,3 @@ pub fn calculate_excess_blob_gas(parent_excess_blob_gas: u64, parent_blob_gas_us
     let excess_blob_gas = parent_excess_blob_gas + parent_blob_gas_used;
     excess_blob_gas.saturating_sub(TARGET_DATA_GAS_PER_BLOCK)
 }
-
-/// Calculates the versioned hash for a KzgCommitment
-///
-/// Specified in [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844#header-extension)
-pub fn kzg_to_versioned_hash(commitment: KzgCommitment) -> H256 {
-    use sha2::Digest;
-    let mut hasher = sha2::Sha256::new();
-    hasher.update(commitment.as_slice());
-    let res = &mut hasher.finalize()[..];
-    res[0] = VERSIONED_HASH_VERSION_KZG;
-    H256::from_slice(&res)
-}