public static List<PreKeyRecord> generatePreKeys(Context context, MasterSecret masterSecret) {
PreKeyStore preKeyStore = new TextSecurePreKeyStore(context, masterSecret);
List<PreKeyRecord> records = new LinkedList<>();
int preKeyIdOffset = getNextPreKeyId(context);
for (int i = 0; i < BATCH_SIZE; i++) {
int preKeyId = (preKeyIdOffset + i) % Medium.MAX_VALUE;
ECKeyPair keyPair = Curve.generateKeyPair();
PreKeyRecord record = new PreKeyRecord(preKeyId, keyPair);
preKeyStore.storePreKey(preKeyId, record);
records.add(record);
}
setNextPreKeyId(context, (preKeyIdOffset + BATCH_SIZE + 1) % Medium.MAX_VALUE);
return records;
}
public static PreKeyRecord generateLastResortKey(Context context, MasterSecret masterSecret) {
PreKeyStore preKeyStore = new TextSecurePreKeyStore(context, masterSecret);
if (preKeyStore.containsPreKey(Medium.MAX_VALUE)) {
try {
return preKeyStore.loadPreKey(Medium.MAX_VALUE);
} catch (InvalidKeyIdException e) {
Log.w("PreKeyUtil", e);
preKeyStore.removePreKey(Medium.MAX_VALUE);
}
}
ECKeyPair keyPair = Curve.generateKeyPair();
PreKeyRecord record = new PreKeyRecord(Medium.MAX_VALUE, keyPair);
preKeyStore.storePreKey(Medium.MAX_VALUE, record);
return record;
}