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Signal Protocol cryptography library for Java

There is a newer version: 2.8.1

/**
 * 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();
  }
}