From d0e402062aa6aba0b8a920e778df0d2024835ca5 Mon Sep 17 00:00:00 2001
From: akwizgran <akwizgran@users.sourceforge.net>
Date: Fri, 13 Jan 2012 13:06:43 +0000
Subject: [PATCH] Unit tests for segmented encrypter and decrypter.
---
.../DuplexSegmentedTransportConnection.java | 3 +
.../SimplexSegmentedTransportWriter.java | 7 +-
.../SegmentedConnectionDecrypter.java | 2 +-
test/build.xml | 2 +
.../ConnectionDecrypterImplTest.java | 18 +---
.../ConnectionEncrypterImplTest.java | 11 +--
.../SegmentedConnectionDecrypterTest.java | 88 +++++++++++++++++++
.../SegmentedConnectionEncrypterTest.java | 84 ++++++++++++++++++
8 files changed, 189 insertions(+), 26 deletions(-)
create mode 100644 test/net/sf/briar/transport/SegmentedConnectionDecrypterTest.java
create mode 100644 test/net/sf/briar/transport/SegmentedConnectionEncrypterTest.java
diff --git a/api/net/sf/briar/api/plugins/duplex/DuplexSegmentedTransportConnection.java b/api/net/sf/briar/api/plugins/duplex/DuplexSegmentedTransportConnection.java
index 3adad23986..728f3e60b4 100644
--- a/api/net/sf/briar/api/plugins/duplex/DuplexSegmentedTransportConnection.java
+++ b/api/net/sf/briar/api/plugins/duplex/DuplexSegmentedTransportConnection.java
@@ -11,6 +11,9 @@ import net.sf.briar.api.plugins.FrameSource;
public interface DuplexSegmentedTransportConnection extends FrameSource,
FrameSink {
+ /** Returns the maximum length of a segment in bytes. */
+ int getMaximumSegmentLength();
+
/**
* Returns true if the output stream should be flushed after each packet.
*/
diff --git a/api/net/sf/briar/api/plugins/simplex/SimplexSegmentedTransportWriter.java b/api/net/sf/briar/api/plugins/simplex/SimplexSegmentedTransportWriter.java
index ff909847eb..2a8cb810bc 100644
--- a/api/net/sf/briar/api/plugins/simplex/SimplexSegmentedTransportWriter.java
+++ b/api/net/sf/briar/api/plugins/simplex/SimplexSegmentedTransportWriter.java
@@ -1,14 +1,19 @@
package net.sf.briar.api.plugins.simplex;
+import net.sf.briar.api.plugins.FrameSink;
+
/**
* An interface for writing data to a simplex segmented transport. The writer is
* not responsible for authenticating or encrypting the data before writing it.
*/
-public interface SimplexSegmentedTransportWriter {
+public interface SimplexSegmentedTransportWriter extends FrameSink {
/** Returns the capacity of the transport in bytes. */
long getCapacity();
+ /** Returns the maximum length of a segment in bytes. */
+ int getMaximumSegmentLength();
+
/**
* Returns true if the output stream should be flushed after each packet.
*/
diff --git a/components/net/sf/briar/transport/SegmentedConnectionDecrypter.java b/components/net/sf/briar/transport/SegmentedConnectionDecrypter.java
index 54d285d5ea..385d967120 100644
--- a/components/net/sf/briar/transport/SegmentedConnectionDecrypter.java
+++ b/components/net/sf/briar/transport/SegmentedConnectionDecrypter.java
@@ -56,7 +56,7 @@ class SegmentedConnectionDecrypter implements FrameSource {
throw new FormatException();
// Decrypt the frame
try {
- int decrypted = frameCipher.update(b, 0, length, b);
+ int decrypted = frameCipher.doFinal(b, 0, length, b);
assert decrypted == length;
} catch(GeneralSecurityException badCipher) {
throw new RuntimeException(badCipher);
diff --git a/test/build.xml b/test/build.xml
index 904f92fb13..8c643549de 100644
--- a/test/build.xml
+++ b/test/build.xml
@@ -58,6 +58,8 @@
<test name='net.sf.briar.transport.ConnectionWriterImplTest'/>
<test name='net.sf.briar.transport.ConnectionWriterTest'/>
<test name='net.sf.briar.transport.FrameReadWriteTest'/>
+ <test name='net.sf.briar.transport.SegmentedConnectionDecrypterTest'/>
+ <test name='net.sf.briar.transport.SegmentedConnectionEncrypterTest'/>
<test name='net.sf.briar.util.ByteUtilsTest'/>
<test name='net.sf.briar.util.FileUtilsTest'/>
<test name='net.sf.briar.util.StringUtilsTest'/>
diff --git a/test/net/sf/briar/transport/ConnectionDecrypterImplTest.java b/test/net/sf/briar/transport/ConnectionDecrypterImplTest.java
index c721d8b59b..f8d09593a4 100644
--- a/test/net/sf/briar/transport/ConnectionDecrypterImplTest.java
+++ b/test/net/sf/briar/transport/ConnectionDecrypterImplTest.java
@@ -36,32 +36,22 @@ public class ConnectionDecrypterImplTest extends BriarTestCase {
}
@Test
- public void testInitiatorDecryption() throws Exception {
- testDecryption(true);
- }
-
- @Test
- public void testResponderDecryption() throws Exception {
- testDecryption(false);
- }
-
- private void testDecryption(boolean initiator) throws Exception {
+ public void testDecryption() throws Exception {
// Calculate the ciphertext for the first frame
byte[] plaintext = new byte[FRAME_HEADER_LENGTH + 123 + MAC_LENGTH];
HeaderEncoder.encodeHeader(plaintext, 0L, 123, 0);
byte[] iv = IvEncoder.encodeIv(0L, frameCipher.getBlockSize());
IvParameterSpec ivSpec = new IvParameterSpec(iv);
frameCipher.init(Cipher.ENCRYPT_MODE, frameKey, ivSpec);
- byte[] ciphertext = new byte[plaintext.length];
- frameCipher.doFinal(plaintext, 0, plaintext.length, ciphertext);
+ byte[] ciphertext = frameCipher.doFinal(plaintext, 0, plaintext.length);
// Calculate the ciphertext for the second frame
byte[] plaintext1 = new byte[FRAME_HEADER_LENGTH + 1234 + MAC_LENGTH];
HeaderEncoder.encodeHeader(plaintext1, 1L, 1234, 0);
IvEncoder.updateIv(iv, 1L);
ivSpec = new IvParameterSpec(iv);
frameCipher.init(Cipher.ENCRYPT_MODE, frameKey, ivSpec);
- byte[] ciphertext1 = new byte[plaintext1.length];
- frameCipher.doFinal(plaintext1, 0, plaintext1.length, ciphertext1);
+ byte[] ciphertext1 = frameCipher.doFinal(plaintext1, 0,
+ plaintext1.length);
// Concatenate the ciphertexts
ByteArrayOutputStream out = new ByteArrayOutputStream();
out.write(ciphertext);
diff --git a/test/net/sf/briar/transport/ConnectionEncrypterImplTest.java b/test/net/sf/briar/transport/ConnectionEncrypterImplTest.java
index 9b25a30f21..17016265e3 100644
--- a/test/net/sf/briar/transport/ConnectionEncrypterImplTest.java
+++ b/test/net/sf/briar/transport/ConnectionEncrypterImplTest.java
@@ -35,16 +35,7 @@ public class ConnectionEncrypterImplTest extends BriarTestCase {
}
@Test
- public void testInitiatorEncryption() throws Exception {
- testEncryption(true);
- }
-
- @Test
- public void testResponderEncryption() throws Exception {
- testEncryption(false);
- }
-
- private void testEncryption(boolean initiator) throws Exception {
+ public void testEncryption() throws Exception {
// Calculate the expected tag
byte[] tag = TagEncoder.encodeTag(0, tagCipher, tagKey);
// Calculate the expected ciphertext for the first frame
diff --git a/test/net/sf/briar/transport/SegmentedConnectionDecrypterTest.java b/test/net/sf/briar/transport/SegmentedConnectionDecrypterTest.java
new file mode 100644
index 0000000000..a987ede8f8
--- /dev/null
+++ b/test/net/sf/briar/transport/SegmentedConnectionDecrypterTest.java
@@ -0,0 +1,88 @@
+package net.sf.briar.transport;
+
+import static net.sf.briar.api.transport.TransportConstants.FRAME_HEADER_LENGTH;
+import static net.sf.briar.api.transport.TransportConstants.MAX_FRAME_LENGTH;
+
+import java.io.IOException;
+
+import javax.crypto.Cipher;
+import javax.crypto.spec.IvParameterSpec;
+
+import net.sf.briar.BriarTestCase;
+import net.sf.briar.api.crypto.CryptoComponent;
+import net.sf.briar.api.crypto.ErasableKey;
+import net.sf.briar.api.plugins.FrameSource;
+import net.sf.briar.crypto.CryptoModule;
+
+import org.junit.Test;
+
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+
+public class SegmentedConnectionDecrypterTest extends BriarTestCase {
+
+ private static final int MAC_LENGTH = 32;
+
+ private final Cipher frameCipher;
+ private final ErasableKey frameKey;
+
+ public SegmentedConnectionDecrypterTest() {
+ super();
+ Injector i = Guice.createInjector(new CryptoModule());
+ CryptoComponent crypto = i.getInstance(CryptoComponent.class);
+ frameCipher = crypto.getFrameCipher();
+ frameKey = crypto.generateTestKey();
+ }
+
+ @Test
+ public void testDecryption() throws Exception {
+ // Calculate the ciphertext for the first frame
+ byte[] plaintext = new byte[FRAME_HEADER_LENGTH + 123 + MAC_LENGTH];
+ HeaderEncoder.encodeHeader(plaintext, 0L, 123, 0);
+ byte[] iv = IvEncoder.encodeIv(0L, frameCipher.getBlockSize());
+ IvParameterSpec ivSpec = new IvParameterSpec(iv);
+ frameCipher.init(Cipher.ENCRYPT_MODE, frameKey, ivSpec);
+ byte[] ciphertext = frameCipher.doFinal(plaintext, 0, plaintext.length);
+ // Calculate the ciphertext for the second frame
+ byte[] plaintext1 = new byte[FRAME_HEADER_LENGTH + 1234 + MAC_LENGTH];
+ HeaderEncoder.encodeHeader(plaintext1, 1L, 1234, 0);
+ IvEncoder.updateIv(iv, 1L);
+ ivSpec = new IvParameterSpec(iv);
+ frameCipher.init(Cipher.ENCRYPT_MODE, frameKey, ivSpec);
+ byte[] ciphertext1 = frameCipher.doFinal(plaintext1, 0,
+ plaintext1.length);
+ // Use a connection decrypter to decrypt the ciphertext
+ byte[][] frames = new byte[][] { ciphertext, ciphertext1 };
+ FrameSource in = new ByteArrayFrameSource(frames);
+ FrameSource decrypter = new SegmentedConnectionDecrypter(in,
+ frameCipher, frameKey, MAC_LENGTH);
+ // First frame
+ byte[] decrypted = new byte[MAX_FRAME_LENGTH];
+ assertEquals(plaintext.length, decrypter.readFrame(decrypted));
+ for(int i = 0; i < plaintext.length; i++) {
+ assertEquals(plaintext[i], decrypted[i]);
+ }
+ // Second frame
+ assertEquals(plaintext1.length, decrypter.readFrame(decrypted));
+ for(int i = 0; i < plaintext1.length; i++) {
+ assertEquals(plaintext1[i], decrypted[i]);
+ }
+ }
+
+ private static class ByteArrayFrameSource implements FrameSource {
+
+ private final byte[][] frames;
+
+ private int frame = 0;
+
+ private ByteArrayFrameSource(byte[][] frames) {
+ this.frames = frames;
+ }
+
+ public int readFrame(byte[] b) throws IOException {
+ byte[] src = frames[frame++];
+ System.arraycopy(src, 0, b, 0, src.length);
+ return src.length;
+ }
+ }
+}
diff --git a/test/net/sf/briar/transport/SegmentedConnectionEncrypterTest.java b/test/net/sf/briar/transport/SegmentedConnectionEncrypterTest.java
new file mode 100644
index 0000000000..9c4cf62dc6
--- /dev/null
+++ b/test/net/sf/briar/transport/SegmentedConnectionEncrypterTest.java
@@ -0,0 +1,84 @@
+package net.sf.briar.transport;
+
+import static org.junit.Assert.assertArrayEquals;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+import javax.crypto.Cipher;
+import javax.crypto.spec.IvParameterSpec;
+
+import net.sf.briar.BriarTestCase;
+import net.sf.briar.api.crypto.CryptoComponent;
+import net.sf.briar.api.crypto.ErasableKey;
+import net.sf.briar.api.plugins.FrameSink;
+import static net.sf.briar.api.transport.TransportConstants.TAG_LENGTH;
+import net.sf.briar.crypto.CryptoModule;
+
+import org.junit.Test;
+
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+
+public class SegmentedConnectionEncrypterTest extends BriarTestCase {
+
+ private static final int MAC_LENGTH = 32;
+
+ private final Cipher tagCipher, frameCipher;
+ private final ErasableKey tagKey, frameKey;
+
+ public SegmentedConnectionEncrypterTest() {
+ super();
+ Injector i = Guice.createInjector(new CryptoModule());
+ CryptoComponent crypto = i.getInstance(CryptoComponent.class);
+ tagCipher = crypto.getTagCipher();
+ frameCipher = crypto.getFrameCipher();
+ tagKey = crypto.generateTestKey();
+ frameKey = crypto.generateTestKey();
+ }
+
+ @Test
+ public void testEncryption() throws Exception {
+ // Calculate the expected tag
+ byte[] tag = TagEncoder.encodeTag(0, tagCipher, tagKey);
+ // Calculate the expected ciphertext for the first frame
+ byte[] iv = new byte[frameCipher.getBlockSize()];
+ byte[] plaintext = new byte[123 + MAC_LENGTH];
+ IvParameterSpec ivSpec = new IvParameterSpec(iv);
+ frameCipher.init(Cipher.ENCRYPT_MODE, frameKey, ivSpec);
+ byte[] ciphertext = frameCipher.doFinal(plaintext);
+ // Calculate the expected ciphertext for the second frame
+ byte[] plaintext1 = new byte[1234 + MAC_LENGTH];
+ IvEncoder.updateIv(iv, 1L);
+ ivSpec = new IvParameterSpec(iv);
+ frameCipher.init(Cipher.ENCRYPT_MODE, frameKey, ivSpec);
+ byte[] ciphertext1 = frameCipher.doFinal(plaintext1);
+ // Concatenate the ciphertexts
+ ByteArrayOutputStream out = new ByteArrayOutputStream();
+ out.write(tag);
+ out.write(ciphertext);
+ out.write(ciphertext1);
+ byte[] expected = out.toByteArray();
+ // Use a connection encrypter to encrypt the plaintext
+ ByteArrayFrameSink sink = new ByteArrayFrameSink();
+ ConnectionEncrypter e = new SegmentedConnectionEncrypter(sink,
+ Long.MAX_VALUE, tagCipher, frameCipher, tagKey, frameKey);
+ // The first frame's buffer must have enough space for the tag
+ byte[] b = new byte[TAG_LENGTH + plaintext.length];
+ System.arraycopy(plaintext, 0, b, 0, plaintext.length);
+ e.writeFrame(b, plaintext.length);
+ e.writeFrame(plaintext1, plaintext1.length);
+ byte[] actual = out.toByteArray();
+ // Check that the actual ciphertext matches the expected ciphertext
+ assertArrayEquals(expected, actual);
+ assertEquals(Long.MAX_VALUE - actual.length, e.getRemainingCapacity());
+ }
+
+ private static class ByteArrayFrameSink extends ByteArrayOutputStream
+ implements FrameSink {
+
+ public void writeFrame(byte[] b, int len) throws IOException {
+ write(b, 0, len);
+ }
+ }
+}
--
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