1 files changed, 15 insertions, 20 deletions
diff --git a/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DCryptoOps.java b/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DCryptoOps.java
index a7203d1..48dc52f 100644
--- a/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DCryptoOps.java
+++ b/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DCryptoOps.java
@@ -1,17 +1,17 @@
-// Copyright 2020 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
-//
-//     https://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.
-
+/* Copyright 2018 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
+ *
+ *     https://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.
+ */
 package com.google.security.cryptauth.lib.securegcm;
 
 import com.google.common.annotations.VisibleForTesting;
@@ -55,11 +55,6 @@ class D2DCryptoOps {
     (byte) 0x6D, (byte) 0xA8, (byte) 0x55, (byte) 0x10
   };
 
-  // Data passed to hkdf to create the key used by the initiator to encode messages.
-  static final String INITIATOR_PURPOSE = "initiator";
-  // Data passed to hkdf to create the key used by the responder to encode messages.
-  static final String RESPONDER_PURPOSE = "responder";
-
   // Don't instantiate
   private D2DCryptoOps() { }
 
@@ -201,7 +196,7 @@ class D2DCryptoOps {
 
   /**
    * Used to derive a distinct key for each initiator and responder.
-   *
+   * 
    * @param masterKey the source key used to derive the new key.
    * @param purpose a string to make the new key different for each purpose.
    * @return the derived {@link SecretKey}.