content: /**
   * Copyright 2013 Bruno Oliveira, and individual contributors
   *
   * 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.
   */
  
  package org.libsodium.jni.crypto;
  
  import java.util.Arrays;
  
  /**
   * @deprecated
   * These are wrapper methods around the sodium api methods.
   * These methods were brought in from another project and will be replaced with method signatures that define exceptions.
   */
  @Deprecated
  public class Util {
  
      private static final int DEFAULT_SIZE = 32;
  
      public static byte[] prependZeros(int n, byte[] message) {
          byte[] result = new byte[n + message.length];
          Arrays.fill(result, (byte) 0);
          System.arraycopy(message, 0, result, n, message.length);
          return result;
      }
  
      public static byte[] removeZeros(int n, byte[] message) {
          return Arrays.copyOfRange(message, n, message.length);
      }
  
      public static void checkLength(byte[] data, int size) {
          if (data == null || data.length != size)
              throw new RuntimeException("Invalid size: " + data.length);
      }
  
      public static byte[] zeros(int n) {
          return new byte[n];
      }
  
      public static boolean isValid(int status, String message) {
          if (status != 0)
              throw new RuntimeException(message);
          return true;
      }
  
      public static byte[] slice(byte[] buffer, int start, int end) {
          return Arrays.copyOfRange(buffer, start, end);
      }
  
      public static byte[] merge(byte[] signature, byte[] message) {
          byte[] result = new byte[signature.length + message.length];
          System.arraycopy(signature, 0, result, 0, signature.length);
          System.arraycopy(message, 0, result, signature.length, message.length);
          return result;
      }
  }
  