diff --git a/Cargo.lock b/Cargo.lock
index caf0be3..f6d5987 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -145,6 +145,7 @@ dependencies = [
  "blobby",
  "hex-literal",
  "hmac",
+ "kdf",
  "sha1",
  "sha2",
 ]
@@ -190,6 +191,12 @@ dependencies = [
  "sha2",
 ]
 
+[[package]]
+name = "kdf"
+version = "0.1.0-pre.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4852c654c9650d06a4293146ead04bedcf29861dc0de1115ca1492b7a27c50aa"
+
 [[package]]
 name = "libc"
 version = "0.2.178"
diff --git a/hkdf/Cargo.toml b/hkdf/Cargo.toml
index 2fe4eb7..77f35c7 100644
--- a/hkdf/Cargo.toml
+++ b/hkdf/Cargo.toml
@@ -15,6 +15,9 @@ rust-version = "1.85"
 [dependencies]
 hmac = "0.13.0-rc.3"
 
+# optional dependencies
+kdf = { version = "0.1.0-pre.1", optional = true }
+
 [dev-dependencies]
 blobby = "0.4"
 hex-literal = "1"
diff --git a/hkdf/src/lib.rs b/hkdf/src/lib.rs
index f4fe166..de5c52a 100644
--- a/hkdf/src/lib.rs
+++ b/hkdf/src/lib.rs
@@ -20,6 +20,9 @@ pub use errors::{InvalidLength, InvalidPrkLength};
 pub use hmac;
 pub use hmac_impl::HmacImpl;
 
+#[cfg(feature = "kdf")]
+pub use kdf::{self, Kdf};
+
 /// [`GenericHkdfExtract`] variant which uses [`Hmac`] for the underlying HMAC implementation.
 pub type HkdfExtract<H> = GenericHkdfExtract<Hmac<H>>;
 /// [`GenericHkdf`] variant which uses [`Hmac`] for the underlying HMAC implementation.
@@ -62,6 +65,16 @@ impl<H: HmacImpl> GenericHkdfExtract<H> {
     }
 }
 
+#[cfg(feature = "kdf")]
+impl<H: HmacImpl> Kdf for GenericHkdfExtract<H> {
+    fn derive_key(&self, secret: &[u8], info: &[u8], out: &mut [u8]) -> kdf::Result<()> {
+        let mut extract = self.clone();
+        extract.input_ikm(secret);
+        let (_, hkdf) = extract.finalize();
+        hkdf.expand(info, out).map_err(|_| kdf::Error)
+    }
+}
+
 /// Structure representing the HKDF, capable of HKDF-Expand and HKDF-Extract operations.
 /// Recommendations for the correct usage of the parameters can be found in the
 /// [crate root](index.html#usage).