1 files changed, 42 insertions, 0 deletions
diff --git a/nearby/presence/np_hkdf/tests/hmac.rs b/nearby/presence/np_hkdf/tests/hmac.rs
new file mode 100644
index 0000000..4ebef5a
--- /dev/null
+++ b/nearby/presence/np_hkdf/tests/hmac.rs
@@ -0,0 +1,42 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use crypto_provider::hmac::MacError;
+use crypto_provider_default::CryptoProviderImpl;
+use np_hkdf::*;
+
+#[test]
+fn verify_hmac_correct_mac() {
+    let data = &[1_u8; 32];
+    let hmac_key = [2; 32];
+
+    let hmac = NpHmacSha256Key::<CryptoProviderImpl>::from(hmac_key);
+
+    let mac = hmac.calculate_hmac(data);
+
+    assert_eq!(Ok(()), hmac.verify_hmac(data, mac));
+}
+
+#[test]
+fn verify_hmac_incorrect_mac() {
+    let data = &[1_u8; 32];
+    let hmac_key = [2; 32];
+
+    let hmac = NpHmacSha256Key::<CryptoProviderImpl>::from(hmac_key);
+
+    let _mac = hmac.calculate_hmac(data);
+
+    // wrong mac
+    assert_eq!(Err(MacError), hmac.verify_hmac(data, [0xFF; 32]));
+}