diff --git a/Cargo.lock b/Cargo.lock
index f55c673..0a8b71d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2398,7 +2398,6 @@ name = "librqbit-core"
 version = "4.0.1"
 dependencies = [
  "anyhow",
- "assert_cfg",
  "bytes",
  "data-encoding",
  "directories",
diff --git a/crates/bencode/Cargo.toml b/crates/bencode/Cargo.toml
index d518cde..ae054bb 100644
--- a/crates/bencode/Cargo.toml
+++ b/crates/bencode/Cargo.toml
@@ -19,5 +19,5 @@ serde = { version = "1", features = ["derive"] }
 buffers = { path = "../buffers", package = "librqbit-buffers", version = "4" }
 clone_to_owned = { path = "../clone_to_owned", package = "librqbit-clone-to-owned", version = "3" }
 anyhow = "1"
-sha1w = { path = "../sha1w", default-features = false, package = "librqbit-sha1-wrapper", version = "4" }
+sha1w = { path = "../sha1w", default-features = false, optional = true, package = "librqbit-sha1-wrapper", version = "4" }
 bytes = "1.7.1"
diff --git a/crates/librqbit_core/Cargo.toml b/crates/librqbit_core/Cargo.toml
index 403b0ce..b6c7850 100644
--- a/crates/librqbit_core/Cargo.toml
+++ b/crates/librqbit_core/Cargo.toml
@@ -31,8 +31,6 @@ directories = "5"
 tokio-util = "0.7.10"
 data-encoding = "2.6.0"
 bytes = "1.7.1"
-assert_cfg = "0.1.0"
-
 
 [dev-dependencies]
 serde_json = "1"
diff --git a/crates/librqbit_core/src/lengths.rs b/crates/librqbit_core/src/lengths.rs
index 1f06053..dd973ae 100644
--- a/crates/librqbit_core/src/lengths.rs
+++ b/crates/librqbit_core/src/lengths.rs
@@ -1,6 +1,6 @@
 use anyhow::Context;
 
-use crate::{constants::CHUNK_SIZE, torrent_metainfo::TorrentMetaV1Info};
+use crate::constants::CHUNK_SIZE;
 
 pub fn last_element_size<T>(total_length: T, piece_length: T) -> T
 where
@@ -73,8 +73,9 @@ impl ValidPieceIndex {
 }
 
 impl Lengths {
+    #[cfg(any(feature = "sha1-crypto-hash", feature = "sha1-ring"))]
     pub fn from_torrent<ByteBuf: AsRef<[u8]>>(
-        torrent: &TorrentMetaV1Info<ByteBuf>,
+        torrent: &crate::torrent_metainfo::TorrentMetaV1Info<ByteBuf>,
     ) -> anyhow::Result<Lengths> {
         let total_length = torrent.iter_file_lengths()?.sum();
         Lengths::new(total_length, torrent.piece_length)
@@ -157,11 +158,7 @@ impl Lengths {
     }
 
     // A helper to iterate over pieces in a file.
-    pub(crate) fn iter_pieces_within_offset(
-        &self,
-        offset_bytes: u64,
-        len: u64,
-    ) -> std::ops::Range<u32> {
+    pub fn iter_pieces_within_offset(&self, offset_bytes: u64, len: u64) -> std::ops::Range<u32> {
         // Validation and correction
         let offset_bytes = offset_bytes.min(self.total_length);
         let end_bytes = (offset_bytes + len).min(self.total_length);
diff --git a/crates/librqbit_core/src/lib.rs b/crates/librqbit_core/src/lib.rs
index eb6d654..636d6b7 100644
--- a/crates/librqbit_core/src/lib.rs
+++ b/crates/librqbit_core/src/lib.rs
@@ -1,16 +1,13 @@
 pub mod constants;
 pub mod directories;
 pub mod hash_id;
+
 pub mod lengths;
 pub mod magnet;
 pub mod peer_id;
 pub mod spawn_utils;
 pub mod speed_estimator;
+#[cfg(any(feature = "sha1-crypto-hash", feature = "sha1-ring"))]
 pub mod torrent_metainfo;
 
 pub use hash_id::Id20;
-
-assert_cfg::exactly_one! {
-    feature = "sha1-crypto-hash",
-    feature = "sha1-ring",
-}