session-android/src/org/thoughtcrime/securesms/crypto/AsymmetricMasterSecret.java

/** 
 * Copyright (C) 2011 Whisper Systems
 * Copyright (C) 2013 Open Whisper Systems
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.thoughtcrime.securesms.crypto;

import org.whispersystems.textsecure.crypto.ecc.Curve;
import org.whispersystems.textsecure.crypto.ecc.ECPrivateKey;
import org.whispersystems.textsecure.crypto.ecc.ECPublicKey;

/**
 * When a user first initializes TextSecure, a few secrets
 * are generated.  These are:
 * 
 * 1) A 128bit symmetric encryption key.
 * 2) A 160bit symmetric MAC key.
 * 3) An ECC keypair.
 * 
 * The first two, along with the ECC keypair's private key, are
 * then encrypted on disk using PBE.
 * 
 * This class represents the ECC keypair.
 * 
 * @author Moxie Marlinspike
 *
 */

public class AsymmetricMasterSecret {

  private final ECPublicKey  djbPublicKey;
  private final ECPrivateKey djbPrivateKey;

  private final ECPublicKey  nistPublicKey;
  private final ECPrivateKey nistPrivateKey;

  public AsymmetricMasterSecret(ECPublicKey djbPublicKey, ECPrivateKey djbPrivateKey,
                                ECPublicKey nistPublicKey, ECPrivateKey nistPrivateKey)
  {
    this.djbPublicKey   = djbPublicKey;
    this.djbPrivateKey  = djbPrivateKey;
    this.nistPublicKey  = nistPublicKey;
    this.nistPrivateKey = nistPrivateKey;
  }

  public ECPublicKey getDjbPublicKey() {
    return djbPublicKey;
  }

  public ECPublicKey getNistPublicKey() {
    return nistPublicKey;
  }

  public ECPrivateKey getPrivateKey(int type) {
    if (type == Curve.DJB_TYPE) {
      return djbPrivateKey;
    } else {
      return nistPrivateKey;
    }
  }

}