content: /**
   * Copyright (C) 2014-2016 Open Whisper Systems
   *
   * Licensed according to the LICENSE file in this repository.
   */
  package org.whispersystems.libsignal;
  
  import com.google.protobuf.ByteString;
  import com.google.protobuf.InvalidProtocolBufferException;
  
  import org.whispersystems.libsignal.ecc.Curve;
  import org.whispersystems.libsignal.ecc.ECPrivateKey;
  
  import static org.whispersystems.libsignal.state.StorageProtos.IdentityKeyPairStructure;
  
  /**
   * Holder for public and private identity key pair.
   *
   * @author Moxie Marlinspike
   */
  public class IdentityKeyPair {
  
    private final IdentityKey  publicKey;
    private final ECPrivateKey privateKey;
  
    public IdentityKeyPair(IdentityKey publicKey, ECPrivateKey privateKey) {
      this.publicKey  = publicKey;
      this.privateKey = privateKey;
    }
  
    public IdentityKeyPair(byte[] serialized) throws InvalidKeyException {
      try {
        IdentityKeyPairStructure structure = IdentityKeyPairStructure.parseFrom(serialized);
        this.publicKey  = new IdentityKey(structure.getPublicKey().toByteArray(), 0);
        this.privateKey = Curve.decodePrivatePoint(structure.getPrivateKey().toByteArray());
      } catch (InvalidProtocolBufferException e) {
        throw new InvalidKeyException(e);
      }
    }
  
    public IdentityKey getPublicKey() {
      return publicKey;
    }
  
    public ECPrivateKey getPrivateKey() {
      return privateKey;
    }
  
    public byte[] serialize() {
      return IdentityKeyPairStructure.newBuilder()
                                     .setPublicKey(ByteString.copyFrom(publicKey.serialize()))
                                     .setPrivateKey(ByteString.copyFrom(privateKey.serialize()))
                                     .build().toByteArray();
    }
  }
  