diff --git a/src/babashka/impl/classes.clj b/src/babashka/impl/classes.clj
index 91aadda1..b33b30f6 100644
--- a/src/babashka/impl/classes.clj
+++ b/src/babashka/impl/classes.clj
@@ -204,6 +204,8 @@
                 java.net.http.WebSocket$Builder
                 java.net.http.WebSocket$Listener
                 java.security.cert.X509Certificate
+                javax.crypto.Mac
+                javax.crypto.spec.SecretKeySpec
                 javax.net.ssl.SSLContext
                 javax.net.ssl.SSLParameters
                 javax.net.ssl.TrustManager
diff --git a/test/babashka/crypto_test.clj b/test/babashka/crypto_test.clj
new file mode 100644
index 00000000..08549691
--- /dev/null
+++ b/test/babashka/crypto_test.clj
@@ -0,0 +1,31 @@
+(ns babashka.crypto-test
+  (:require [babashka.test-utils :as test-utils]
+            [clojure.edn :as edn]
+            [clojure.test :refer [deftest is]])
+  (:import (javax.crypto Mac)
+           (javax.crypto.spec SecretKeySpec)))
+
+(defn bb [& exprs]
+  (edn/read-string (apply test-utils/bb nil (map str exprs))))
+
+(defn hmac-sha-256 [key data]
+  (let [algo "HmacSHA256"
+        mac (Mac/getInstance algo)]
+    (.init mac (SecretKeySpec. key algo))
+    (.doFinal mac (.getBytes data "UTF-8"))))
+
+(deftest hmac-sha-256-test
+  (let [key-s "some-key"
+        data "some-data"
+        expected-sha (String. (hmac-sha-256 (.getBytes key-s) data))]
+    (is (= expected-sha (bb '(do (ns net
+                                   (:import (javax.crypto Mac)
+                                            (javax.crypto.spec SecretKeySpec)))
+                                 (defn hmac-sha-256 [key data]
+                                   (let [algo "HmacSHA256"
+                                         mac (Mac/getInstance algo)]
+                                     (.init mac (SecretKeySpec. key algo))
+                                     (.doFinal mac (.getBytes data "UTF-8"))))
+                                 (let [key-s "some-key"
+                                       data "some-data"]
+                                   (String. (hmac-sha-256 (.getBytes key-s) data)))))))))