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Refresh PEP on session establish

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We now track preKeys used to establish incoming sessions with us. On
each new established session, we remove the used prekey from PEP. We
have to do this because libaxolotl-java internally clears the used
preKey from its storage, so we will not be able to establish any future
sessions using that key.
This commit is contained in:
Andreas Straub 2015-07-03 13:34:34 +02:00
parent 69600502d2
commit bf4185ac08
1 changed files with 18 additions and 0 deletions
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18
src/main/java/eu/siacs/conversations/crypto/axolotl/AxolotlService.java
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@ -444,6 +444,7 @@ public class AxolotlService {
public static class XmppAxolotlSession {
private SessionCipher cipher;
private boolean isTrusted = false;
private Integer preKeyId = null;
private SQLiteAxolotlStore sqLiteAxolotlStore;
private AxolotlAddress remoteAddress;
@ -463,6 +464,14 @@ public class AxolotlService {
return this.isTrusted;
}
public Integer getPreKeyId() {
return preKeyId;
}
public void resetPreKeyId() {
preKeyId = null;
}
public byte[] processReceiving(XmppAxolotlMessage.XmppAxolotlMessageHeader incomingHeader) {
byte[] plaintext = null;
try {
@ -470,6 +479,9 @@ public class AxolotlService {
PreKeyWhisperMessage message = new PreKeyWhisperMessage(incomingHeader.getContents());
Log.d(Config.LOGTAG, "PreKeyWhisperMessage ID:" + message.getSignedPreKeyId() + "/" + message.getPreKeyId());
plaintext = cipher.decrypt(message);
if (message.getPreKeyId().isPresent()) {
preKeyId = message.getPreKeyId().get();
}
} catch (InvalidMessageException | InvalidVersionException e) {
WhisperMessage message = new WhisperMessage(incomingHeader.getContents());
plaintext = cipher.decrypt(message);
@ -946,6 +958,12 @@ public class AxolotlService {
Log.d(Config.LOGTAG, "Got payload key from axolotl header. Decrypting message...");
plaintextMessage = message.decrypt(session, payloadKey);
}
Integer preKeyId = session.getPreKeyId();
if (preKeyId != null) {
publishBundlesIfNeeded();
session.resetPreKeyId();
}
break;
}
}