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Code Issues Projects Releases Wiki Activity

Variable-length frames (untested).

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akwizgran
2015-01-05 17:35:29 +00:00
parent d3bf2d59a1
commit 1f69f0d2f6
16 changed files with 147 additions and 368 deletions
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93
briar-tests/src/org/briarproject/crypto/StreamEncrypterImplTest.java
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@@ -1,102 +1,27 @@
package org.briarproject.crypto;
import static org.briarproject.api.transport.TransportConstants.AAD_LENGTH;
import static org.briarproject.api.transport.TransportConstants.HEADER_LENGTH;
import static org.briarproject.api.transport.TransportConstants.IV_LENGTH;
import static org.briarproject.api.transport.TransportConstants.MAC_LENGTH;
import static org.briarproject.api.transport.TransportConstants.MAX_FRAME_LENGTH;
import static org.briarproject.api.transport.TransportConstants.TAG_LENGTH;
import java.io.ByteArrayOutputStream;
import java.util.Random;
import org.briarproject.BriarTestCase;
import org.briarproject.TestLifecycleModule;
import org.briarproject.TestSystemModule;
import org.briarproject.api.crypto.AuthenticatedCipher;
import org.briarproject.api.crypto.CryptoComponent;
import org.briarproject.api.crypto.SecretKey;
import org.junit.Test;
import com.google.inject.Guice;
import com.google.inject.Injector;
public class StreamEncrypterImplTest extends BriarTestCase {
// FIXME: This is an integration test, not a unit test
private final CryptoComponent crypto;
private final AuthenticatedCipher frameCipher;
public StreamEncrypterImplTest() {
Injector i = Guice.createInjector(new CryptoModule(),
new TestLifecycleModule(), new TestSystemModule());
crypto = i.getInstance(CryptoComponent.class);
frameCipher = crypto.getFrameCipher();
}
@Test
public void testEncryptionWithoutTag() throws Exception {
int payloadLength = 123;
byte[] iv = new byte[IV_LENGTH], aad = new byte[AAD_LENGTH];
byte[] plaintext = new byte[MAX_FRAME_LENGTH - MAC_LENGTH];
byte[] ciphertext = new byte[MAX_FRAME_LENGTH];
SecretKey frameKey = crypto.generateSecretKey();
// Calculate the expected ciphertext
FrameEncoder.encodeIv(iv, 0);
FrameEncoder.encodeAad(aad, 0, plaintext.length);
frameCipher.init(true, frameKey, iv, aad);
FrameEncoder.encodeHeader(plaintext, false, payloadLength);
frameCipher.doFinal(plaintext, 0, plaintext.length, ciphertext, 0);
// Check that the actual ciphertext matches what's expected
ByteArrayOutputStream out = new ByteArrayOutputStream();
StreamEncrypterImpl o = new StreamEncrypterImpl(out, frameCipher,
frameKey, null);
o.writeFrame(new byte[payloadLength], payloadLength, false);
byte[] actual = out.toByteArray();
assertEquals(MAX_FRAME_LENGTH, actual.length);
for(int i = 0; i < MAX_FRAME_LENGTH; i++)
assertEquals(ciphertext[i], actual[i]);
// FIXME
}
@Test
public void testEncryptionWithTag() throws Exception {
byte[] tag = new byte[TAG_LENGTH];
new Random().nextBytes(tag);
int payloadLength = 123;
byte[] iv = new byte[IV_LENGTH], aad = new byte[AAD_LENGTH];
byte[] plaintext = new byte[MAX_FRAME_LENGTH - MAC_LENGTH];
byte[] ciphertext = new byte[MAX_FRAME_LENGTH];
SecretKey frameKey = crypto.generateSecretKey();
// Calculate the expected ciphertext
FrameEncoder.encodeIv(iv, 0);
FrameEncoder.encodeAad(aad, 0, plaintext.length);
frameCipher.init(true, frameKey, iv, aad);
FrameEncoder.encodeHeader(plaintext, false, payloadLength);
frameCipher.doFinal(plaintext, 0, plaintext.length, ciphertext, 0);
// Check that the actual tag and ciphertext match what's expected
ByteArrayOutputStream out = new ByteArrayOutputStream();
StreamEncrypterImpl o = new StreamEncrypterImpl(out, frameCipher,
frameKey, tag);
o.writeFrame(new byte[payloadLength], payloadLength, false);
byte[] actual = out.toByteArray();
assertEquals(TAG_LENGTH + MAX_FRAME_LENGTH, actual.length);
for(int i = 0; i < TAG_LENGTH; i++) assertEquals(tag[i], actual[i]);
for(int i = 0; i < MAX_FRAME_LENGTH; i++)
assertEquals(ciphertext[i], actual[TAG_LENGTH + i]);
// FIXME
}
@Test
public void testCloseConnectionWithoutWriting() throws Exception {
byte[] tag = new byte[TAG_LENGTH];
new Random().nextBytes(tag);
ByteArrayOutputStream out = new ByteArrayOutputStream();
// Initiator's constructor
StreamEncrypterImpl o = new StreamEncrypterImpl(out, frameCipher,
crypto.generateSecretKey(), tag);
// Write an empty final frame without having written any other frames
o.writeFrame(new byte[MAX_FRAME_LENGTH - MAC_LENGTH], 0, true);
// The tag and the empty frame should be written to the output stream
assertEquals(TAG_LENGTH + HEADER_LENGTH + MAC_LENGTH, out.size());
public void testFlushWritesTagIfNotAlreadyWritten() throws Exception {
// FIXME
}
@Test
public void testFlushDoesNotWriteTagIfAlreadyWritten() throws Exception {
// FIXME
}
}