The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/mobile/android/base/sync/crypto/PersistedCrypto5Keys.java	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,103 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +
     1.8 +package org.mozilla.gecko.sync.crypto;
     1.9 +
    1.10 +import org.mozilla.gecko.background.common.log.Logger;
    1.11 +import org.mozilla.gecko.sync.CollectionKeys;
    1.12 +import org.mozilla.gecko.sync.CryptoRecord;
    1.13 +
    1.14 +import android.content.SharedPreferences;
    1.15 +
    1.16 +public class PersistedCrypto5Keys {
    1.17 +  public static final String LOG_TAG = "PersistedC5Keys";
    1.18 +
    1.19 +  public static final String CRYPTO5_KEYS_SERVER_RESPONSE_BODY = "crypto5KeysServerResponseBody";
    1.20 +  public static final String CRYPTO5_KEYS_LAST_MODIFIED        = "crypto5KeysLastModified";
    1.21 +
    1.22 +  protected SharedPreferences prefs;
    1.23 +  protected KeyBundle syncKeyBundle;
    1.24 +
    1.25 +  public PersistedCrypto5Keys(SharedPreferences prefs, KeyBundle syncKeyBundle) {
    1.26 +    if (syncKeyBundle == null) {
    1.27 +      throw new IllegalArgumentException("Null syncKeyBundle passed in to PersistedCrypto5Keys constructor.");
    1.28 +    }
    1.29 +    this.prefs = prefs;
    1.30 +    this.syncKeyBundle = syncKeyBundle;
    1.31 +  }
    1.32 +
    1.33 +  /**
    1.34 +   * Get persisted crypto/keys.
    1.35 +   * <p>
    1.36 +   * crypto/keys is fetched from an encrypted JSON-encoded <code>CryptoRecord</code>.
    1.37 +   *
    1.38 +   * @return A <code>CollectionKeys</code> instance or <code>null</code> if none
    1.39 +   *         is currently persisted.
    1.40 +   */
    1.41 +  public CollectionKeys keys() {
    1.42 +    String keysJSON = prefs.getString(CRYPTO5_KEYS_SERVER_RESPONSE_BODY, null);
    1.43 +    if (keysJSON == null) {
    1.44 +      return null;
    1.45 +    }
    1.46 +    try {
    1.47 +      CryptoRecord cryptoRecord = CryptoRecord.fromJSONRecord(keysJSON);
    1.48 +      CollectionKeys keys = new CollectionKeys();
    1.49 +      keys.setKeyPairsFromWBO(cryptoRecord, syncKeyBundle);
    1.50 +      return keys;
    1.51 +    } catch (Exception e) {
    1.52 +      Logger.warn(LOG_TAG, "Got exception decrypting persisted crypto/keys.", e);
    1.53 +      return null;
    1.54 +    }
    1.55 +  }
    1.56 +
    1.57 +  /**
    1.58 +   * Persist crypto/keys.
    1.59 +   * <p>
    1.60 +   * crypto/keys is stored as an encrypted JSON-encoded <code>CryptoRecord</code>.
    1.61 +   *
    1.62 +   * @param keys
    1.63 +   *          The <code>CollectionKeys</code> object to persist, which should
    1.64 +   *          have the same default key bundle as the sync key bundle.
    1.65 +   */
    1.66 +  public void persistKeys(CollectionKeys keys) {
    1.67 +    if (keys == null) {
    1.68 +      Logger.debug(LOG_TAG, "Clearing persisted crypto/keys.");
    1.69 +      prefs.edit().remove(CRYPTO5_KEYS_SERVER_RESPONSE_BODY).commit();
    1.70 +      return;
    1.71 +    }
    1.72 +    try {
    1.73 +      CryptoRecord cryptoRecord = keys.asCryptoRecord();
    1.74 +      cryptoRecord.keyBundle = syncKeyBundle;
    1.75 +      cryptoRecord.encrypt();
    1.76 +      String keysJSON = cryptoRecord.toJSONString();
    1.77 +      Logger.debug(LOG_TAG, "Persisting crypto/keys.");
    1.78 +      prefs.edit().putString(CRYPTO5_KEYS_SERVER_RESPONSE_BODY, keysJSON).commit();
    1.79 +    } catch (Exception e) {
    1.80 +      Logger.warn(LOG_TAG, "Got exception encrypting while persisting crypto/keys.", e);
    1.81 +    }
    1.82 +  }
    1.83 +
    1.84 +  public boolean persistedKeysExist() {
    1.85 +    return lastModified() > 0;
    1.86 +  }
    1.87 +
    1.88 +  public long lastModified() {
    1.89 +    return prefs.getLong(CRYPTO5_KEYS_LAST_MODIFIED, -1);
    1.90 +  }
    1.91 +
    1.92 +  public void persistLastModified(long lastModified) {
    1.93 +    if (lastModified <= 0) {
    1.94 +      Logger.debug(LOG_TAG, "Clearing persisted crypto/keys last modified timestamp.");
    1.95 +      prefs.edit().remove(CRYPTO5_KEYS_LAST_MODIFIED).commit();
    1.96 +      return;
    1.97 +    }
    1.98 +    Logger.debug(LOG_TAG, "Persisting crypto/keys last modified timestamp " + lastModified + ".");
    1.99 +    prefs.edit().putLong(CRYPTO5_KEYS_LAST_MODIFIED, lastModified).commit();
   1.100 +  }
   1.101 +
   1.102 +  public void purge() {
   1.103 +    persistLastModified(-1);
   1.104 +    persistKeys(null);
   1.105 +  }
   1.106 +}