diff --git a/Cargo.lock b/Cargo.lock
index 775bb9b..d9ec68a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -120,6 +120,15 @@ version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b3d1d046238990b9cf5bcde22a3fb3584ee5cf65fb2765f454ed428c7a0063da"
 
+[[package]]
+name = "assert_cfg"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04e2651f366b7ee3f97729fded1441539b49d5f39eeb05b842689e11e84501b2"
+dependencies = [
+ "const_panic",
+]
+
 [[package]]
 name = "async-backtrace"
 version = "0.2.7"
@@ -531,6 +540,12 @@ version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
+[[package]]
+name = "const_panic"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7782af8f90fe69a4bb41e460abe1727d493403d8b2cc43201a3a3e906b24379f"
+
 [[package]]
 name = "core-foundation"
 version = "0.9.4"
@@ -1517,6 +1532,7 @@ name = "librqbit-core"
 version = "4.0.1"
 dependencies = [
  "anyhow",
+ "assert_cfg",
  "bytes",
  "data-encoding",
  "directories",
@@ -1583,6 +1599,7 @@ dependencies = [
 name = "librqbit-sha1-wrapper"
 version = "4.0.0"
 dependencies = [
+ "assert_cfg",
  "crypto-hash",
  "ring",
 ]
diff --git a/crates/librqbit/Cargo.toml b/crates/librqbit/Cargo.toml
index 840771c..7cc9b25 100644
--- a/crates/librqbit/Cargo.toml
+++ b/crates/librqbit/Cargo.toml
@@ -17,8 +17,19 @@ http-api = ["axum", "tower-http"]
 upnp-serve-adapter = ["upnp-serve"]
 webui = []
 timed_existence = []
-default-tls = ["reqwest/default-tls", "sha1w/sha1-crypto-hash"]
-rust-tls = ["reqwest/rustls-tls", "sha1w/sha1-ring"]
+default-tls = [
+    "reqwest/default-tls",
+    "sha1w/sha1-crypto-hash",
+    "bencode/sha1-crypto-hash",
+    "librqbit-core/sha1-crypto-hash",
+]
+rust-tls = [
+    "reqwest/rustls-tls",
+    "sha1w/sha1-ring",
+    "sha1w/sha1-ring",
+    "bencode/sha1-ring",
+    "librqbit-core/sha1-ring",
+]
 storage_middleware = ["lru"]
 storage_examples = []
 tracing-subscriber-utils = ["tracing-subscriber"]
diff --git a/crates/librqbit_core/Cargo.toml b/crates/librqbit_core/Cargo.toml
index 552012b..403b0ce 100644
--- a/crates/librqbit_core/Cargo.toml
+++ b/crates/librqbit_core/Cargo.toml
@@ -31,6 +31,7 @@ directories = "5"
 tokio-util = "0.7.10"
 data-encoding = "2.6.0"
 bytes = "1.7.1"
+assert_cfg = "0.1.0"
 
 
 [dev-dependencies]
diff --git a/crates/librqbit_core/src/lib.rs b/crates/librqbit_core/src/lib.rs
index 63577d6..eb6d654 100644
--- a/crates/librqbit_core/src/lib.rs
+++ b/crates/librqbit_core/src/lib.rs
@@ -9,3 +9,8 @@ pub mod speed_estimator;
 pub mod torrent_metainfo;
 
 pub use hash_id::Id20;
+
+assert_cfg::exactly_one! {
+    feature = "sha1-crypto-hash",
+    feature = "sha1-ring",
+}
diff --git a/crates/librqbit_core/src/torrent_metainfo.rs b/crates/librqbit_core/src/torrent_metainfo.rs
index b1caf55..ee61bd5 100644
--- a/crates/librqbit_core/src/torrent_metainfo.rs
+++ b/crates/librqbit_core/src/torrent_metainfo.rs
@@ -29,7 +29,11 @@ pub fn torrent_from_bytes_ext<'de, BufType: Deserialize<'de> + From<&'de [u8]>>(
     let mut t = TorrentMetaV1::deserialize(&mut de)?;
     let (digest, info_bytes) = match (de.torrent_info_digest, de.torrent_info_bytes) {
         (Some(digest), Some(info_bytes)) => (digest, info_bytes),
-        _ => anyhow::bail!("programming error"),
+        (o1, o2) => anyhow::bail!(
+            "programming error: digest.is_some()={}, info_bytes.is_some()={}. Probably one of bencode/sha1* features isn't enabled.",
+            o1.is_some(),
+            o2.is_some()
+        ),
     };
     t.info_hash = Id20::new(digest);
     Ok(ParsedTorrent {
diff --git a/crates/sha1w/Cargo.toml b/crates/sha1w/Cargo.toml
index 486c3b9..bd2fd17 100644
--- a/crates/sha1w/Cargo.toml
+++ b/crates/sha1w/Cargo.toml
@@ -16,5 +16,6 @@ sha1-crypto-hash = ["crypto-hash"]
 sha1-ring = ["ring"]
 
 [dependencies]
+assert_cfg = "0.1.0"
 crypto-hash = { version = "0.3", optional = true }
 ring = { version = "0.17", optional = true }
diff --git a/crates/sha1w/src/lib.rs b/crates/sha1w/src/lib.rs
index 1982a07..6a7ec22 100644
--- a/crates/sha1w/src/lib.rs
+++ b/crates/sha1w/src/lib.rs
@@ -11,6 +11,11 @@ pub trait ISha1 {
     fn finish(self) -> [u8; 20];
 }
 
+assert_cfg::exactly_one! {
+    feature = "sha1-crypto-hash",
+    feature = "sha1-ring",
+}
+
 #[cfg(feature = "sha1-crypto-hash")]
 mod crypto_hash_impl {
     use super::ISha1;