1 files changed, 46 insertions, 0 deletions
diff --git a/std/jwt/_signature_test.ts b/std/jwt/_signature_test.ts
new file mode 100644
index 000000000..c02f0f4bc
--- /dev/null
+++ b/std/jwt/_signature_test.ts
@@ -0,0 +1,46 @@
+import { assertEquals } from "../testing/asserts.ts";
+import { create, decode } from "./mod.ts";
+
+import {
+  convertHexToBase64url,
+  create as createSignature,
+  verify as verifySignature,
+} from "./_signature.ts";
+
+const algorithm = "HS256";
+const key = "m$y-key";
+
+Deno.test("[jwt] create signature", async function () {
+  // https://www.freeformatter.com/hmac-generator.html
+  const computedHmacInHex =
+    "2b9e6619fa7f2c8d8b3565c88365376b75b1b0e5d87e41218066fd1986f2c056";
+  assertEquals(
+    await createSignature(algorithm, key, "thisTextWillBeEncrypted"),
+    convertHexToBase64url(computedHmacInHex),
+  );
+
+  const anotherVerifiedSignatureInBase64Url =
+    "p2KneqJhji8T0PDlVxcG4DROyzTgWXbDhz_mcTVojXo";
+  assertEquals(
+    await createSignature(
+      algorithm,
+      key,
+      "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ",
+    ),
+    anotherVerifiedSignatureInBase64Url,
+  );
+});
+
+Deno.test("[jwt] verify signature", async function () {
+  const jwt = await create({}, key);
+  const { header, signature } = decode(jwt);
+
+  const validSignature = await verifySignature({
+    signature,
+    key,
+    algorithm: header.alg,
+    signingInput: jwt.slice(0, jwt.lastIndexOf(".")),
+  });
+
+  assertEquals(validSignature, true);
+});