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83 lines
2.8 KiB
Java
83 lines
2.8 KiB
Java
/**
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* Copyright (C) 2011 Whisper Systems
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.thoughtcrime.securesms.util;
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import org.thoughtcrime.securesms.crypto.MasterSecret;
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/**
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* This is not straightforward in Java, but this class makes
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* a best-effort attempt to clean up memory in immutable objects.
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*
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* @author Moxie Marlinspike
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*/
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public class MemoryCleaner {
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// XXX This is basically not happening for now.
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// The problem is that now secrets are moving
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// through both Intents and binder calls, which
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// means sometimes they're shared memory and sometimes
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// they're not. We're going to need to do a lot more
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// work in order to accurately keep track of when to
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// wipe this within an Activity lifecycle. =(
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public static void clean(MasterSecret masterSecret) {
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// if (masterSecret == null)
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// return;
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//
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// try {
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// SecretKeySpec cipherKey = masterSecret.getEncryptionKey();
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// SecretKeySpec macKey = masterSecret.getMacKey();
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//
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// Field keyField = SecretKeySpec.class.getDeclaredField("key");
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// keyField.setAccessible(true);
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//
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// byte[] cipherKeyField = (byte[]) keyField.get(cipherKey);
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// byte[] macKeyField = (byte[]) keyField.get(macKey);
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//
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// Arrays.fill(cipherKeyField, (byte)0x00);
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// Arrays.fill(macKeyField, (byte)0x00);
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//
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// } catch (NoSuchFieldException nsfe) {
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// Log.w("MemoryCleaner", nsfe);
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// } catch (IllegalArgumentException e) {
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// Log.w("MemoryCleaner", e);
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// } catch (IllegalAccessException e) {
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// Log.w("MemoryCleaner", e);
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// }
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}
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public static void clean(String string) {
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// if (string == null)
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// return;
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//
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// try {
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// Field charArrayField = String.class.getDeclaredField("value");
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// charArrayField.setAccessible(true);
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//
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// char[] internalBuffer = (char[])charArrayField.get(string);
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//
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// Arrays.fill(internalBuffer, 'A');
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// } catch (NoSuchFieldException nsfe) {
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// Log.w("MemoryCleaner", nsfe);
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// } catch (IllegalArgumentException e) {
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// Log.w("MemoryCleaner", e);
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// } catch (IllegalAccessException e) {
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// Log.w("MemoryCleaner", e);
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// }
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}
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}
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