diff options
Diffstat (limited to 'java/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderChainKey.java')
-rw-r--r-- | java/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderChainKey.java | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/java/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderChainKey.java b/java/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderChainKey.java index 71375923..304c4667 100644 --- a/java/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderChainKey.java +++ b/java/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderChainKey.java @@ -1,3 +1,19 @@ +/** + * Copyright (C) 2014-2015 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.whispersystems.libaxolotl.groups.ratchet; import java.security.InvalidKeyException; @@ -6,6 +22,16 @@ import java.security.NoSuchAlgorithmException; import javax.crypto.Mac; import javax.crypto.spec.SecretKeySpec; +/** + * Each SenderKey is a "chain" of keys, each derived from the previous. + * + * At any given point in time, the state of a SenderKey can be represented + * as the current chain key value, along with its iteration count. From there, + * subsequent iterations can be derived, as well as individual message keys from + * each chain key. + * + * @author Moxie Marlinspike + */ public class SenderChainKey { private static final byte[] MESSAGE_KEY_SEED = {0x01}; |