Generate "prekeys" at push registration time.
This generates a large number of key exchange messages and registers them with the server during signup.pull/1/head
Moxie Marlinspike
12 years ago
parent
cfb7b8fcba
commit
2042ca6cb7
@ -0,0 +1,16 @@
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package org.whispersystems.textsecure.push;
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import java.util.List;
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public class PreKeyList {
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private List<String> keys;
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public PreKeyList(List<String> keys) {
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this.keys = keys;
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}
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public List<String> getKeys() {
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return keys;
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}
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}
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Binary file not shown.
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all:
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protoc --java_out=../src/ PreKeyEntity.proto
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package textsecure;
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option java_package = "org.thoughtcrime.securesms.encoded";
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option java_outer_classname = "PreKeyProtos";
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message PreKeyEntity {
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optional uint64 id = 1;
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optional bytes key = 2;
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}
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@ -0,0 +1,43 @@
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package org.thoughtcrime.securesms.crypto;
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import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
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import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
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import org.bouncycastle.crypto.params.ECPublicKeyParameters;
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import org.thoughtcrime.securesms.util.Util;
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public class PreKeyPair {
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private final MasterCipher masterCipher;
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private final ECPrivateKeyParameters privateKey;
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private final ECPublicKeyParameters publicKey;
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public PreKeyPair(MasterSecret masterSecret, AsymmetricCipherKeyPair keyPair) {
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this.masterCipher = new MasterCipher(masterSecret);
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this.publicKey = (ECPublicKeyParameters)keyPair.getPublic();
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this.privateKey = (ECPrivateKeyParameters)keyPair.getPrivate();
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}
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public PreKeyPair(MasterSecret masterSecret, byte[] serialized) throws InvalidKeyException {
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if (serialized.length < KeyUtil.POINT_SIZE + 1)
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throw new InvalidKeyException("Serialized length: " + serialized.length);
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byte[] privateKeyBytes = new byte[serialized.length - KeyUtil.POINT_SIZE];
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System.arraycopy(serialized, KeyUtil.POINT_SIZE, privateKeyBytes, 0, privateKeyBytes.length);
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this.masterCipher = new MasterCipher(masterSecret);
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this.publicKey = KeyUtil.decodePoint(serialized, 0);
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this.privateKey = masterCipher.decryptKey(privateKeyBytes);
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}
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public ECPublicKeyParameters getPublicKey() {
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return publicKey;
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}
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public byte[] serialize() {
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byte[] publicKeyBytes = KeyUtil.encodePoint(publicKey.getQ());
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byte[] privateKeyBytes = masterCipher.encryptKey(privateKey);
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return Util.combine(publicKeyBytes, privateKeyBytes);
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}
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}
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@ -0,0 +1,113 @@
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package org.thoughtcrime.securesms.crypto;
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import android.content.Context;
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import android.util.Log;
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import com.google.protobuf.ByteString;
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import org.thoughtcrime.securesms.database.keys.InvalidKeyIdException;
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import org.thoughtcrime.securesms.database.keys.PreKeyRecord;
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import org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity;
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import org.whispersystems.textsecure.push.PreKeyList;
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import org.whispersystems.textsecure.util.Base64;
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import java.io.File;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.util.LinkedList;
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import java.util.List;
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public class PreKeyUtil {
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public static final int BATCH_SIZE = 70;
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public static List<PreKeyRecord> generatePreKeys(Context context, MasterSecret masterSecret) {
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List<PreKeyRecord> records = new LinkedList<PreKeyRecord>();
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long preKeyIdOffset = getNextPreKeyId(context);
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for (int i=0;i<BATCH_SIZE;i++) {
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Log.w("PreKeyUtil", "Generating PreKey: " + (preKeyIdOffset + i));
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PreKeyPair keyPair = new PreKeyPair(masterSecret, KeyUtil.generateKeyPair());
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PreKeyRecord record = new PreKeyRecord(context, masterSecret, preKeyIdOffset + i, keyPair);
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record.save();
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records.add(record);
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}
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return records;
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}
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public static List<PreKeyRecord> getPreKeys(Context context, MasterSecret masterSecret) {
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List<PreKeyRecord> records = new LinkedList<PreKeyRecord>();
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File directory = getPreKeysDirectory(context);
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String[] keyRecordIds = directory.list();
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for (String keyRecordId : keyRecordIds) {
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try {
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records.add(new PreKeyRecord(context, masterSecret, Long.parseLong(keyRecordId)));
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} catch (InvalidKeyIdException e) {
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Log.w("PreKeyUtil", e);
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new File(getPreKeysDirectory(context), keyRecordId).delete();
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} catch (NumberFormatException nfe) {
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Log.w("PreKeyUtil", nfe);
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new File(getPreKeysDirectory(context), keyRecordId).delete();
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}
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}
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return records;
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}
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public static void clearPreKeys(Context context) {
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File directory = getPreKeysDirectory(context);
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String[] keyRecords = directory.list();
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for (String keyRecord : keyRecords) {
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new File(directory, keyRecord).delete();
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}
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}
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public static PreKeyList toJson(List<PreKeyRecord> records) {
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List<String> encoded = new LinkedList<String>();
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for (PreKeyRecord record : records) {
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PreKeyEntity entity = PreKeyEntity.newBuilder().setId(record.getId())
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.setKey(ByteString.copyFrom(KeyUtil.encodePoint(record.getKeyPair().getPublicKey().getQ())))
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.build();
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String encodedEntity = Base64.encodeBytesWithoutPadding(entity.toByteArray());
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encoded.add(encodedEntity);
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}
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return new PreKeyList(encoded);
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}
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private static long getNextPreKeyId(Context context) {
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try {
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File directory = getPreKeysDirectory(context);
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String[] keyRecordIds = directory.list();
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long nextPreKeyId = 0;
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for (String keyRecordId : keyRecordIds) {
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if (Long.parseLong(keyRecordId) > nextPreKeyId)
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nextPreKeyId = Long.parseLong(keyRecordId);
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}
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if (nextPreKeyId == 0)
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nextPreKeyId = SecureRandom.getInstance("SHA1PRNG").nextInt(Integer.MAX_VALUE/2);
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return nextPreKeyId;
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} catch (NoSuchAlgorithmException e) {
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throw new AssertionError(e);
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}
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}
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private static File getPreKeysDirectory(Context context) {
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File directory = new File(context.getFilesDir(), PreKeyRecord.PREKEY_DIRECTORY);
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if (!directory.exists())
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directory.mkdirs();
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return directory;
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}
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}
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@ -0,0 +1,125 @@
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package org.thoughtcrime.securesms.database.keys;
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import android.content.Context;
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import android.util.Log;
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import org.thoughtcrime.securesms.crypto.InvalidKeyException;
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import org.thoughtcrime.securesms.crypto.MasterCipher;
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import org.thoughtcrime.securesms.crypto.MasterSecret;
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import org.thoughtcrime.securesms.crypto.PreKeyPair;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.nio.channels.FileChannel;
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public class PreKeyRecord extends Record {
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private static final Object FILE_LOCK = new Object();
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private static final int CURRENT_VERSION_MARKER = 1;
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private final MasterCipher masterCipher;
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private final MasterSecret masterSecret;
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private PreKeyPair keyPair;
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private long id;
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public PreKeyRecord(Context context, MasterSecret masterSecret, long id)
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throws InvalidKeyIdException
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{
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super(context, PREKEY_DIRECTORY, id+"");
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this.id = id;
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this.masterSecret = masterSecret;
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this.masterCipher = new MasterCipher(masterSecret);
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loadData();
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}
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public PreKeyRecord(Context context, MasterSecret masterSecret,
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long id, PreKeyPair keyPair)
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{
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super(context, PREKEY_DIRECTORY, id+"");
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this.id = id;
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this.keyPair = keyPair;
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this.masterSecret = masterSecret;
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this.masterCipher = new MasterCipher(masterSecret);
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}
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public long getId() {
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return id;
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}
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public PreKeyPair getKeyPair() {
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return keyPair;
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}
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public static boolean hasRecord(Context context, long id) {
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Log.w("PreKeyRecord", "Checking: " + id);
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return Record.hasRecord(context, PREKEY_DIRECTORY, id+"");
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}
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public static void delete(Context context, long id) {
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Record.delete(context, PREKEY_DIRECTORY, id+"");
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}
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public void save() {
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synchronized (FILE_LOCK) {
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try {
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RandomAccessFile file = openRandomAccessFile();
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FileChannel out = file.getChannel();
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out.position(0);
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writeInteger(CURRENT_VERSION_MARKER, out);
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writeKeyPair(keyPair, out);
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out.force(true);
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out.truncate(out.position());
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out.close();
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file.close();
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} catch (IOException ioe) {
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Log.w("PreKeyRecord", ioe);
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}
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}
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}
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private void loadData() throws InvalidKeyIdException {
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synchronized (FILE_LOCK) {
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try {
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FileInputStream in = this.openInputStream();
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int recordVersion = readInteger(in);
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if (recordVersion != CURRENT_VERSION_MARKER) {
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Log.w("PreKeyRecord", "Invalid version: " + recordVersion);
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return;
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}
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keyPair = readKeyPair(in, masterCipher);
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in.close();
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} catch (FileNotFoundException e) {
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Log.w("PreKeyRecord", e);
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throw new InvalidKeyIdException(e);
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} catch (IOException ioe) {
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Log.w("PreKeyRecord", ioe);
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throw new InvalidKeyIdException(ioe);
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} catch (InvalidKeyException ike) {
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Log.w("LocalKeyRecord", ike);
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throw new InvalidKeyIdException(ike);
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}
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}
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}
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private void writeKeyPair(PreKeyPair keyPair, FileChannel out) throws IOException {
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byte[] serialized = keyPair.serialize();
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writeBlob(serialized, out);
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}
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private PreKeyPair readKeyPair(FileInputStream in, MasterCipher masterCipher)
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throws IOException, InvalidKeyException
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{
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byte[] keyPairBytes = readBlob(in);
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return new PreKeyPair(masterSecret, keyPairBytes);
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}
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}
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@ -0,0 +1,451 @@
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// Generated by the protocol buffer compiler. DO NOT EDIT!
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// source: PreKeyEntity.proto
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package org.thoughtcrime.securesms.encoded;
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public final class PreKeyProtos {
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private PreKeyProtos() {}
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public static void registerAllExtensions(
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com.google.protobuf.ExtensionRegistry registry) {
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}
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public interface PreKeyEntityOrBuilder
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extends com.google.protobuf.MessageOrBuilder {
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// optional uint64 id = 1;
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boolean hasId();
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long getId();
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// optional bytes key = 2;
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boolean hasKey();
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com.google.protobuf.ByteString getKey();
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}
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public static final class PreKeyEntity extends
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com.google.protobuf.GeneratedMessage
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implements PreKeyEntityOrBuilder {
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// Use PreKeyEntity.newBuilder() to construct.
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private PreKeyEntity(Builder builder) {
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super(builder);
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}
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private PreKeyEntity(boolean noInit) {}
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private static final PreKeyEntity defaultInstance;
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public static PreKeyEntity getDefaultInstance() {
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return defaultInstance;
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}
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public PreKeyEntity getDefaultInstanceForType() {
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return defaultInstance;
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}
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public static final com.google.protobuf.Descriptors.Descriptor
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getDescriptor() {
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return org.thoughtcrime.securesms.encoded.PreKeyProtos.internal_static_textsecure_PreKeyEntity_descriptor;
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}
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protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
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internalGetFieldAccessorTable() {
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return org.thoughtcrime.securesms.encoded.PreKeyProtos.internal_static_textsecure_PreKeyEntity_fieldAccessorTable;
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}
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private int bitField0_;
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// optional uint64 id = 1;
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public static final int ID_FIELD_NUMBER = 1;
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private long id_;
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public boolean hasId() {
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return ((bitField0_ & 0x00000001) == 0x00000001);
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}
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public long getId() {
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return id_;
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}
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// optional bytes key = 2;
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public static final int KEY_FIELD_NUMBER = 2;
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private com.google.protobuf.ByteString key_;
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public boolean hasKey() {
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return ((bitField0_ & 0x00000002) == 0x00000002);
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}
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public com.google.protobuf.ByteString getKey() {
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return key_;
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}
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private void initFields() {
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id_ = 0L;
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key_ = com.google.protobuf.ByteString.EMPTY;
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}
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private byte memoizedIsInitialized = -1;
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public final boolean isInitialized() {
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byte isInitialized = memoizedIsInitialized;
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if (isInitialized != -1) return isInitialized == 1;
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memoizedIsInitialized = 1;
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return true;
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}
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public void writeTo(com.google.protobuf.CodedOutputStream output)
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throws java.io.IOException {
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getSerializedSize();
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if (((bitField0_ & 0x00000001) == 0x00000001)) {
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output.writeUInt64(1, id_);
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}
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if (((bitField0_ & 0x00000002) == 0x00000002)) {
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output.writeBytes(2, key_);
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}
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getUnknownFields().writeTo(output);
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}
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private int memoizedSerializedSize = -1;
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public int getSerializedSize() {
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int size = memoizedSerializedSize;
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if (size != -1) return size;
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size = 0;
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if (((bitField0_ & 0x00000001) == 0x00000001)) {
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private static final long serialVersionUID = 0L;
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@java.lang.Override
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protected java.lang.Object writeReplace()
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throws java.io.ObjectStreamException {
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return super.writeReplace();
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}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseFrom(
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com.google.protobuf.ByteString data)
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throws com.google.protobuf.InvalidProtocolBufferException {
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return newBuilder().mergeFrom(data).buildParsed();
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}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseFrom(
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com.google.protobuf.ByteString data,
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com.google.protobuf.ExtensionRegistryLite extensionRegistry)
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throws com.google.protobuf.InvalidProtocolBufferException {
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return newBuilder().mergeFrom(data, extensionRegistry)
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.buildParsed();
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}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseFrom(byte[] data)
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throws com.google.protobuf.InvalidProtocolBufferException {
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return newBuilder().mergeFrom(data).buildParsed();
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}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseFrom(
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byte[] data,
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com.google.protobuf.ExtensionRegistryLite extensionRegistry)
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throws com.google.protobuf.InvalidProtocolBufferException {
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return newBuilder().mergeFrom(data, extensionRegistry)
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.buildParsed();
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}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseFrom(java.io.InputStream input)
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throws java.io.IOException {
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return newBuilder().mergeFrom(input).buildParsed();
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}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseFrom(
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java.io.InputStream input,
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com.google.protobuf.ExtensionRegistryLite extensionRegistry)
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throws java.io.IOException {
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return newBuilder().mergeFrom(input, extensionRegistry)
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.buildParsed();
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}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseDelimitedFrom(java.io.InputStream input)
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throws java.io.IOException {
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Builder builder = newBuilder();
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if (builder.mergeDelimitedFrom(input)) {
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return builder.buildParsed();
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} else {
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return null;
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}
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}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseDelimitedFrom(
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java.io.InputStream input,
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com.google.protobuf.ExtensionRegistryLite extensionRegistry)
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throws java.io.IOException {
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Builder builder = newBuilder();
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||||
if (builder.mergeDelimitedFrom(input, extensionRegistry)) {
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return builder.buildParsed();
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||||
} else {
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return null;
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}
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}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseFrom(
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com.google.protobuf.CodedInputStream input)
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||||
throws java.io.IOException {
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return newBuilder().mergeFrom(input).buildParsed();
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||||
}
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public static org.thoughtcrime.securesms.encoded.PreKeyProtos.PreKeyEntity parseFrom(
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com.google.protobuf.CodedInputStream input,
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||||
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
|
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Loading…
Reference in New Issue