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Ensure that message.previousCounter can never go below zero

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Scott Nonnenberg 2020-01-29 14:13:50 -08:00 committed by GitHub
parent 7461250caf
commit de630a2ea8
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1 changed files with 3 additions and 0 deletions
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libtextsecure/libsignal-protocol.js
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@ -36092,6 +36092,9 @@ SessionCipher.prototype = {
delete chain.messageKeys[chain.chainKey.counter];
msg.counter = chain.chainKey.counter;
msg.previousCounter = session.currentRatchet.previousCounter;
if (msg.previousCounter < 0) {
msg.previousCounter = 0;
}
return Internal.crypto.encrypt(
keys[0], buffer, keys[2].slice(0, 16)