diff --git a/Cargo.lock b/Cargo.lock
index 1f06362..ed4952e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6,6 +6,12 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7dfdb4953a096c551ce9ace855a604d702e6e62d77fac690575ae347571717f5"
 
+[[package]]
+name = "blobby"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc52553543ecb104069b0ff9e0fcc5c739ad16202935528a112d974e8f1a4ee8"
+
 [[package]]
 name = "block-buffer"
 version = "0.9.0"
@@ -123,6 +129,7 @@ name = "hkdf"
 version = "0.10.0"
 dependencies = [
  "bencher",
+ "blobby",
  "crypto-tests",
  "digest 0.9.0",
  "hex",
diff --git a/hkdf/Cargo.toml b/hkdf/Cargo.toml
index a025733..292bf0c 100644
--- a/hkdf/Cargo.toml
+++ b/hkdf/Cargo.toml
@@ -22,6 +22,7 @@ digest = "0.9"
 hmac = "0.10"
 
 [dev-dependencies]
+blobby = "0.3"
 crypto-tests = "0.5.*"
 hex = "0.4"
 sha-1 = "0.9"
diff --git a/hkdf/tests/data/wycheproof-sha1.blb b/hkdf/tests/data/wycheproof-sha1.blb
new file mode 100644
index 0000000..cb7dd3c
Binary files /dev/null and b/hkdf/tests/data/wycheproof-sha1.blb differ
diff --git a/hkdf/tests/data/wycheproof-sha256.blb b/hkdf/tests/data/wycheproof-sha256.blb
new file mode 100644
index 0000000..6213609
Binary files /dev/null and b/hkdf/tests/data/wycheproof-sha256.blb differ
diff --git a/hkdf/tests/data/wycheproof-sha384.blb b/hkdf/tests/data/wycheproof-sha384.blb
new file mode 100644
index 0000000..2323055
Binary files /dev/null and b/hkdf/tests/data/wycheproof-sha384.blb differ
diff --git a/hkdf/tests/data/wycheproof-sha512.blb b/hkdf/tests/data/wycheproof-sha512.blb
new file mode 100644
index 0000000..7a75318
Binary files /dev/null and b/hkdf/tests/data/wycheproof-sha512.blb differ
diff --git a/hkdf/tests/tests.rs b/hkdf/tests/tests.rs
index 6b18e0d..00a18c1 100644
--- a/hkdf/tests/tests.rs
+++ b/hkdf/tests/tests.rs
@@ -4,7 +4,7 @@ use hex;
 
 use hkdf::{Hkdf, HkdfExtract};
 use sha1::Sha1;
-use sha2::Sha256;
+use sha2::{Sha256, Sha384, Sha512};
 
 struct Test<'a> {
     ikm: &'a str,
@@ -329,3 +329,48 @@ fn test_extract_streaming() {
         num_concatted += 1;
     }
 }
+
+/// Define test
+macro_rules! new_test {
+    ($name:ident, $test_name:expr, $hkdf:ty) => {
+        #[test]
+        fn $name() {
+            use blobby::Blob4Iterator;
+
+            fn run_test(ikm: &[u8], salt: &[u8], info: &[u8], okm: &[u8]) -> Option<&'static str> {
+                let prk = <$hkdf>::new(Some(salt), ikm);
+                let mut got_okm = vec![0; okm.len()];
+
+                if prk.expand(info, &mut got_okm).is_err() {
+                    return Some("prk expand");
+                }
+                if got_okm != okm {
+                    return Some("mismatch in okm");
+                }
+                None
+            }
+
+            let data = include_bytes!(concat!("data/", $test_name, ".blb"));
+
+            for (i, row) in Blob4Iterator::new(data).unwrap().enumerate() {
+                let [ikm, salt, info, okm] = row.unwrap();
+                if let Some(desc) = run_test(ikm, salt, info, okm) {
+                    panic!(
+                        "\n\
+                         Failed test №{}: {}\n\
+                         ikm:\t{:?}\n\
+                         salt:\t{:?}\n\
+                         info:\t{:?}\n\
+                         okm:\t{:?}\n",
+                        i, desc, ikm, salt, info, okm
+                    );
+                }
+            }
+        }
+    };
+}
+
+new_test!(wycheproof_sha1, "wycheproof-sha1", Hkdf::<Sha1>);
+new_test!(wycheproof_sha256, "wycheproof-sha256", Hkdf::<Sha256>);
+new_test!(wycheproof_sha384, "wycheproof-sha384", Hkdf::<Sha384>);
+new_test!(wycheproof_sha512, "wycheproof-sha512", Hkdf::<Sha512>);