A Java library for communicating via TextSecure.
The axolotl encryption protocol is a stateful protocol, so libtextsecure users
need to implement the storage interface AxolotlStore, which handles load/store
of your key and session information to durable media.
IdentityKeyPair identityKey = KeyHelper.generateIdentityKeyPair();
List<PreKeyRecord> oneTimePreKeys = KeyHelper.generatePreKeys(100);
PreKeyRecord lastResortKey = KeyHelper.generateLastResortKey();
SignedPreKeyRecord signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKey, signedPreKeyId);
The above are then stored locally so that they're available for load via the AxolotlStore.
At install time, clients need to register with the TextSecure server.
private final String URL = "https://my.textsecure.server.com";
private final TrustStore TRUST_STORE = new MyTrustStoreImpl();
private final String USERNAME = "+14151231234";
private final String PASSWORD = generateRandomPassword();
TextSecureAccountManager accountManager = new TextSecureAccountManager(URL, TRUST_STORE,
USERNAME, PASSWORD);
accountManager.requestSmsVerificationCode();
accountManager.verifyAccount(receivedSmsVerificationCode, generateRandomSignalingKey(),
false, generateRandomInstallId());
accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));
accountManager.setPreKeys(identityKey.getPublic(), lastResortKey, signedPreKey, oneTimePreKeys);
TextSecureMessageSender messageSender = new TextSecureMessageSender(URL, TRUST_STORE, USERNAME, PASSWORD,
localRecipientId, new MyAxolotlStore(),
Optional.absent());
messageSender.sendMessage(new TextSecureAddress("+14159998888"),
TextSecureMessage.newBuilder()
.withBody("Hello, world!")
.build());
TextSecureMessageSender messageSender = new TextSecureMessageSender(URL, TRUST_STORE, USERNAME, PASSWORD,
localRecipientId, new MyAxolotlStore(),
Optional.absent());
File myAttachment = new File("/path/to/my.attachment");
FileInputStream attachmentStream = new FileInputStream(myAttachment);
TextSecureAttachment attachment = TextSecureAttachment.newStreamBuilder()
.withStream(attachmentStream)
.withContentType("image/png")
.withLength(myAttachment.size())
.build();
messageSender.sendMessage(new TextSecureAddress("+14159998888"),
TextSecureMessage.newBuilder()
.withBody("An attachment!")
.withAttachment(attachment)
.build());
TextSecureMessageReceiver messageReceiver = new TextSecureMessageReceiver(URL, TRUST_STORE, USERNAME, PASSWORD, mySignalingKey);
TextSecureMessagePipe messagePipe;
try {
messagePipe = messageReciever.createMessagePipe();
while (listeningForMessages) {
TextSecureEnvelope envelope = messagePipe.read(timeout, timeoutTimeUnit);
TextSecureCipher cipher = new TextSecureCipher(new MyAxolotlStore());
TextSecureMessage message = cipher.decrypt(envelope);
System.out.println("Received message: " + message.getBody().get());
}
} finally {
if (messagePipe != null)
messagePipe.close();
}
This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See http://www.wassenaar.org/ for more information.
The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing cryptographic functions with asymmetric algorithms. The form and manner of this distribution makes it eligible for export under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for both object code and source code.
Copyright 2013-2015 Open Whisper Systems
Licensed under the AGPLv3: https://www.gnu.org/licenses/agpl-3.0.html