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Make sure "previous counter" is never negative.

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Moxie Marlinspike 2014-07-22 17:48:02 -07:00
parent 4caebdcd06
commit c94a7b1eff
1 changed files with 1 additions and 1 deletions
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libaxolotl/src/main/java/org/whispersystems/libaxolotl/SessionCipher.java
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@ -261,7 +261,7 @@ public class SessionCipher {
sessionState.setRootKey(senderChain.first()); sessionState.setRootKey(senderChain.first());
sessionState.addReceiverChain(theirEphemeral, receiverChain.second()); sessionState.addReceiverChain(theirEphemeral, receiverChain.second());
sessionState.setPreviousCounter(sessionState.getSenderChainKey().getIndex()-1); sessionState.setPreviousCounter(Math.max(sessionState.getSenderChainKey().getIndex()-1, 0));
sessionState.setSenderChain(ourNewEphemeral, senderChain.second()); sessionState.setSenderChain(ourNewEphemeral, senderChain.second());
return receiverChain.second(); return receiverChain.second();