diff --git a/src/api/s3_put.rs b/src/api/s3_put.rs
index 37a1ece27..1939f2cf5 100644
--- a/src/api/s3_put.rs
+++ b/src/api/s3_put.rs
@@ -52,14 +52,14 @@ pub async fn handle_put(
 	if first_block.len() < INLINE_THRESHOLD {
 		let mut md5sum = Md5::new();
 		md5sum.update(&first_block[..]);
-		let md5sum_arr = md5sum.finalize();
-		let md5sum_hex = hex::encode(md5sum_arr);
+		let data_md5sum = md5sum.finalize();
+		let data_md5sum_hex = hex::encode(data_md5sum);
 
-		let sha256sum_hash = sha256sum(&first_block[..]);
+		let data_sha256sum = sha256sum(&first_block[..]);
 
 		ensure_checksum_matches(
-			md5sum_arr.as_slice(),
-			sha256sum_hash,
+			data_md5sum.as_slice(),
+			data_sha256sum,
 			content_md5.as_deref(),
 			content_sha256,
 		)?;
@@ -71,7 +71,7 @@ pub async fn handle_put(
 				ObjectVersionMeta {
 					headers,
 					size: first_block.len() as u64,
-					etag: md5sum_hex.clone(),
+					etag: data_md5sum_hex.clone(),
 				},
 				first_block,
 			)),
@@ -80,7 +80,7 @@ pub async fn handle_put(
 		let object = Object::new(bucket.into(), key.into(), vec![object_version]);
 		garage.object_table.insert(&object).await?;
 
-		return Ok(put_response(version_uuid, md5sum_hex));
+		return Ok(put_response(version_uuid, data_md5sum_hex));
 	}
 
 	// Write version identifier in object table so that we have a trace
@@ -95,7 +95,7 @@ pub async fn handle_put(
 
 	// Initialize corresponding entry in version table
 	let version = Version::new(version_uuid, bucket.into(), key.into(), false);
-	let first_block_hash = sha256sum(&first_block[..]);
+	let first_block_hash = blake2sum(&first_block[..]);
 
 	// Transfer data and verify checksum
 	let tx_result = read_and_put_blocks(
@@ -107,14 +107,14 @@ pub async fn handle_put(
 		&mut chunker,
 	)
 	.await
-	.and_then(|(total_size, md5sum_arr, sha256sum)| {
+	.and_then(|(total_size, data_md5sum, data_sha256sum)| {
 		ensure_checksum_matches(
-			md5sum_arr.as_slice(),
-			sha256sum,
+			data_md5sum.as_slice(),
+			data_sha256sum,
 			content_md5.as_deref(),
 			content_sha256,
 		)
-		.map(|()| (total_size, md5sum_arr))
+		.map(|()| (total_size, data_md5sum))
 	});
 
 	// If something went wrong, clean up
@@ -148,13 +148,13 @@ pub async fn handle_put(
 /// Validate MD5 sum against content-md5 header
 /// and sha256sum against signed content-sha256
 fn ensure_checksum_matches(
-	md5sum: &[u8],
-	sha256sum: garage_util::data::FixedBytes32,
+	data_md5sum: &[u8],
+	data_sha256sum: garage_util::data::FixedBytes32,
 	content_md5: Option<&str>,
 	content_sha256: Option<garage_util::data::FixedBytes32>,
 ) -> Result<(), Error> {
 	if let Some(expected_sha256) = content_sha256 {
-		if expected_sha256 != sha256sum {
+		if expected_sha256 != data_sha256sum {
 			return Err(Error::BadRequest(format!(
 				"Unable to validate x-amz-content-sha256"
 			)));
@@ -163,7 +163,7 @@ fn ensure_checksum_matches(
 		}
 	}
 	if let Some(expected_md5) = content_md5 {
-		if expected_md5.trim_matches('"') != base64::encode(md5sum) {
+		if expected_md5.trim_matches('"') != base64::encode(data_md5sum) {
 			return Err(Error::BadRequest(format!("Unable to validate content-md5")));
 		} else {
 			trace!("Successfully validated content-md5");
@@ -204,7 +204,7 @@ async fn read_and_put_blocks(
 		if let Some(block) = next_block {
 			md5hasher.update(&block[..]);
 			sha256hasher.input(&block[..]);
-			let block_hash = sha256sum(&block[..]);
+			let block_hash = blake2sum(&block[..]);
 			let block_len = block.len();
 			put_curr_version_block = put_block_meta(
 				garage.clone(),
@@ -222,14 +222,14 @@ async fn read_and_put_blocks(
 	}
 
 	let total_size = next_offset as u64;
-	let md5sum_arr = md5hasher.finalize();
+	let data_md5sum = md5hasher.finalize();
 
-	let sha256sum_arr = sha256hasher.result();
+	let data_sha256sum = sha256hasher.result();
 	let mut hash = [0u8; 32];
-	hash.copy_from_slice(&sha256sum_arr[..]);
-	let sha256sum_arr = Hash::from(hash);
+	hash.copy_from_slice(&data_sha256sum[..]);
+	let data_sha256sum = Hash::from(hash);
 
-	Ok((total_size, md5sum_arr, sha256sum_arr))
+	Ok((total_size, data_md5sum, data_sha256sum))
 }
 
 async fn put_block_meta(
@@ -389,8 +389,8 @@ pub async fn handle_put_part(
 
 	// Copy block to store
 	let version = Version::new(version_uuid, bucket, key, false);
-	let first_block_hash = sha256sum(&first_block[..]);
-	let (_, md5sum_arr, sha256sum) = read_and_put_blocks(
+	let first_block_hash = blake2sum(&first_block[..]);
+	let (_, data_md5sum, data_sha256sum) = read_and_put_blocks(
 		&garage,
 		version,
 		part_number,
@@ -401,14 +401,14 @@ pub async fn handle_put_part(
 	.await?;
 
 	ensure_checksum_matches(
-		md5sum_arr.as_slice(),
-		sha256sum,
+		data_md5sum.as_slice(),
+		data_sha256sum,
 		content_md5.as_deref(),
 		content_sha256,
 	)?;
 
 	let response = Response::builder()
-		.header("ETag", format!("\"{}\"", hex::encode(md5sum_arr)))
+		.header("ETag", format!("\"{}\"", hex::encode(data_md5sum)))
 		.body(Body::from(vec![]))
 		.unwrap();
 	Ok(response)
diff --git a/src/model/block.rs b/src/model/block.rs
index d3957403a..57f4c077a 100644
--- a/src/model/block.rs
+++ b/src/model/block.rs
@@ -176,7 +176,7 @@ impl BlockManager {
 		f.read_to_end(&mut data).await?;
 		drop(f);
 
-		if data::sha256sum(&data[..]) != *hash {
+		if data::blake2sum(&data[..]) != *hash {
 			let _lock = self.data_dir_lock.lock().await;
 			warn!("Block {:?} is corrupted. Deleting and resyncing.", hash);
 			fs::remove_file(path).await?;