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.keys;
  
  import org.libsodium.jni.crypto.Point;
  import org.libsodium.jni.crypto.Util;
  import org.libsodium.jni.encoders.Encoder;
  
  import static org.libsodium.jni.SodiumConstants.PUBLICKEY_BYTES;
  import static org.libsodium.jni.SodiumConstants.SECRETKEY_BYTES;
  import static org.libsodium.jni.NaCl.sodium;
  import static org.libsodium.jni.crypto.Util.checkLength;
  import static org.libsodium.jni.crypto.Util.zeros;
  
  public class KeyPair {
  
      private byte[] publicKey;
      private byte[] seed;
      private final byte[] secretKey;
  
      public KeyPair() {
          this.secretKey = zeros(SECRETKEY_BYTES);
          this.publicKey = zeros(PUBLICKEY_BYTES);
          sodium().crypto_box_curve25519xsalsa20poly1305_keypair(publicKey, secretKey);
      }
  
  
      public KeyPair(byte[] seed){
          Util.checkLength(seed, SECRETKEY_BYTES);
          this.seed = seed;
          this.secretKey = zeros(SECRETKEY_BYTES);
          this.publicKey = zeros(PUBLICKEY_BYTES);
          Util.isValid(sodium().crypto_box_curve25519xsalsa20poly1305_seed_keypair(publicKey, secretKey, seed), "Failed to generate a key pair");
      }
  
  //    public KeyPair(byte[] secretKey) {
  //        this.secretKey = secretKey;
  //        checkLength(this.secretKey, SECRETKEY_BYTES);
  //    }
  
      public KeyPair(String secretKey, Encoder encoder) {
          this(encoder.decode(secretKey));
      }
  
      public PublicKey getPublicKey() {
          Point point = new Point();
          byte[] key = publicKey != null ? publicKey : point.mult(secretKey).toBytes();
          return new PublicKey(key);
      }
  
      public PrivateKey getPrivateKey() {
          return new PrivateKey(secretKey);
      }
  }
  