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2411e2008b
authenticate each frame before parsing its contents. Each connection starts with a tag, followed by any number of frames, each starting with the frame number (32 bits) and payload length (16 bits), and ending with a MAC (256 bits). Tags have the following format: 32 bits reserved, 16 bits for the transport ID, 32 bits for the connection number, 32 bits (set to zero in the tag) for the frame number, and 16 bits (set to zero in the tag) for the block number. The tag is encrypted with the tag key in ECB mode. Frame numbers for each connection must start from zero and must be contiguous and strictly increasing. Each frame is encrypted with the frame key in CTR mode, using the plaintext tag with the appropriate frame number to initialise the counter. The maximum frame size is 64 KiB, including header and footer. The maximum amount of data that can be sent over a connection is 2^32 frames - roughly 2^48 bytes, or 8 terabytes, with the maximum frame size of 64 KiB. If that isn't sufficient we can add another 16 bits to the frame counter.
76 lines
2.0 KiB
Java
76 lines
2.0 KiB
Java
package net.sf.briar;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.PrintStream;
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import java.util.Random;
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import java.util.concurrent.atomic.AtomicInteger;
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import junit.framework.TestCase;
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import net.sf.briar.api.protocol.UniqueId;
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public class TestUtils {
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private static final AtomicInteger nextTestDir =
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new AtomicInteger((int) (Math.random() * 1000 * 1000));
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private static final Random random = new Random();
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public static void delete(File f) {
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if(f.isDirectory()) for(File child : f.listFiles()) delete(child);
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f.delete();
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}
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public static void createFile(File f, String s) throws IOException {
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f.getParentFile().mkdirs();
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PrintStream out = new PrintStream(new FileOutputStream(f));
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out.print(s);
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out.flush();
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out.close();
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}
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public static File getTestDirectory() {
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int name = nextTestDir.getAndIncrement();
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File testDir = new File("test.tmp/" + name);
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return testDir;
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}
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public static void deleteTestDirectory(File testDir) {
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delete(testDir);
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testDir.getParentFile().delete(); // Delete if empty
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}
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public static File getBuildDirectory() {
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File build = new File("build"); // Ant
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if(build.exists() && build.isDirectory()) return build;
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File bin = new File("bin"); // Eclipse
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if(bin.exists() && bin.isDirectory()) return bin;
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throw new RuntimeException("Could not find build directory");
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}
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public static File getFontDirectory() {
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File f = new File("i18n");
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if(f.exists() && f.isDirectory()) return f;
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f = new File("../i18n");
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if(f.exists() && f.isDirectory()) return f;
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throw new RuntimeException("Could not find font directory");
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}
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public static byte[] getRandomId() {
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byte[] b = new byte[UniqueId.LENGTH];
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random.nextBytes(b);
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return b;
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}
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public static void readFully(InputStream in, byte[] b) throws IOException {
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int offset = 0;
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while(offset < b.length) {
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int read = in.read(b, offset, b.length - offset);
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if(read == -1) break;
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offset += read;
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}
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TestCase.assertEquals(b.length, offset);
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}
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}
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