/*
    * Copyright 2023 The Netty Project
    *
    * The Netty Project licenses this file to you 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 io.netty.handler.codec.quic;
  
  import java.util.Arrays;
  
  /**
   * Session Ticket Key
   */
  public final class SslSessionTicketKey {
      /**
       * Size of session ticket key name
       */
      public static final int NAME_SIZE = 16;
      /**
       * Size of session ticket key HMAC key
       */
      public static final int HMAC_KEY_SIZE = 16;
      /**
       * Size of session ticket key AES key
       */
      public static final int AES_KEY_SIZE = 16;
      /**
       * Size of session ticket key
       */
      public static final int TICKET_KEY_SIZE = NAME_SIZE + HMAC_KEY_SIZE + AES_KEY_SIZE;
  
      // package private so we can access these in BoringSSLSessionTicketCallback without calling clone() on the byte[].
      final byte[] name;
      final byte[] hmacKey;
      final byte[] aesKey;
  
      /**
       * Construct SessionTicketKey.
       * @param name the name of the session ticket key
       * @param hmacKey the HMAC key of the session ticket key
       * @param aesKey the AES key of the session ticket key
       */
      public SslSessionTicketKey(byte[] name, byte[] hmacKey, byte[] aesKey) {
          if (name == null || name.length != NAME_SIZE) {
              throw new IllegalArgumentException("Length of name must be " + NAME_SIZE);
          }
          if (hmacKey == null || hmacKey.length != HMAC_KEY_SIZE) {
              throw new IllegalArgumentException("Length of hmacKey must be " + HMAC_KEY_SIZE);
          }
          if (aesKey == null || aesKey.length != AES_KEY_SIZE) {
              throw new IllegalArgumentException("Length of aesKey must be " + AES_KEY_SIZE);
          }
          this.name = name.clone();
          this.hmacKey = hmacKey.clone();
          this.aesKey = aesKey.clone();
      }
  
      /**
       * Get name.
       *
       * @return the name of the session ticket key
       */
      public byte[] name() {
          return name.clone();
      }
  
      /**
       * Get HMAC key.
       * @return the HMAC key of the session ticket key
       */
      public byte[] hmacKey() {
          return hmacKey.clone();
      }
  
      /**
       * Get AES Key.
       * @return the AES key of the session ticket key
       */
      public byte[] aesKey() {
          return aesKey.clone();
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
         }
 
         SslSessionTicketKey that = (SslSessionTicketKey) o;
 
         if (!Arrays.equals(name, that.name)) {
             return false;
         }
         if (!Arrays.equals(hmacKey, that.hmacKey)) {
             return false;
         }
         return Arrays.equals(aesKey, that.aesKey);
     }
 
     @Override
     public int hashCode() {
         int result = Arrays.hashCode(name);
         result = 31 * result + Arrays.hashCode(hmacKey);
         result = 31 * result + Arrays.hashCode(aesKey);
         return result;
     }
 
     @Override
     public String toString() {
         return "SessionTicketKey{" +
                 "name=" + Arrays.toString(name) +
                 ", hmacKey=" + Arrays.toString(hmacKey) +
                 ", aesKey=" + Arrays.toString(aesKey) +
                 '}';
     }
 }