test: Add test for HMAC key derivation

test/crypto.ts

@@ -39,4 +39,22 @@ context("Crypto", () => {
       ["verify"]), core.CryptoError);
   });
 
+  it("HKDF derive HMAC key", async () => {
+    const hkdf = await crypto.subtle.importKey("raw", new Uint8Array([1, 2, 3, 4, 5]), { name: "HKDF" }, false, ["deriveKey"]);
+    const hmac = await crypto.subtle.deriveKey({
+      name: "HKDF",
+      hash: "SHA-256",
+      info: new Uint8Array([1, 2, 3, 4, 5]),
+      salt: new Uint8Array([1, 2, 3, 4, 5]),
+    } as globalThis.HkdfParams,
+    hkdf,
+    {
+      name: "HMAC",
+      hash: "SHA-1",
+    } as globalThis.HmacImportParams,
+    false,
+    ["sign"]);
+    assert.strictEqual((hmac.algorithm as globalThis.HmacKeyAlgorithm).length, 512);
+  });
+
 });