private void ctrCounterTest() {
CipherParameters params =
new ParametersWithIV(
new KeyParameter(Hex.decode("5F060D3716B345C253F6749ABAC10917")),
Hex.decode("000000000000000000000000000000"));
SICBlockCipher engine = new SICBlockCipher(new AESEngine());
engine.init(true, params);
SecureRandom rand = new SecureRandom();
byte[] cipher = new byte[256 * 16];
byte[] plain = new byte[255 * 16];
rand.nextBytes(plain);
engine.processBytes(plain, 0, plain.length, cipher, 0);
engine.init(true, params);
byte[] fragment = new byte[20];
plain = new byte[256 * 16];
engine.init(true, params);
try {
engine.processBytes(plain, 0, plain.length, cipher, 0);
fail("out of range data not caught");
} catch (IllegalStateException e) {
if (!"Counter in CTR/SIC mode out of range.".equals(e.getMessage())) {
fail("wrong exception");
}
}
}
/**
* Write hard to identify random data to the OutputStream. Does not drain the global secure random
* number generator, and is significantly faster than it.
*
* @param os The stream to write to.
* @param length The number of bytes to write.
* @throws IOException If unable to write to the stream.
*/
public static void fill(OutputStream os, long length) throws IOException {
long remaining = length;
byte[] buffer = new byte[BUFFER_SIZE];
int read = 0;
while ((remaining == -1) || (remaining > 0)) {
synchronized (FileUtil.class) {
if (cis == null || cisCounter > Long.MAX_VALUE / 2) {
// Reset it well before the birthday paradox (note this is actually counting bytes).
byte[] key = new byte[16];
byte[] iv = new byte[16];
SecureRandom rng = NodeStarter.getGlobalSecureRandom();
rng.nextBytes(key);
rng.nextBytes(iv);
AESFastEngine e = new AESFastEngine();
SICBlockCipher ctr = new SICBlockCipher(e);
ctr.init(true, new ParametersWithIV(new KeyParameter(key), iv));
cis = new CipherInputStream(zis, new BufferedBlockCipher(ctr));
cisCounter = 0;
}
read =
cis.read(
buffer,
0,
((remaining > BUFFER_SIZE) || (remaining == -1)) ? BUFFER_SIZE : (int) remaining);
cisCounter += read;
}
if (read == -1) {
if (length == -1) {
return;
}
throw new EOFException("stream reached eof");
}
os.write(buffer, 0, read);
if (remaining > 0) remaining -= read;
}
}
private void skipTest() {
CipherParameters params =
new ParametersWithIV(
new KeyParameter(Hex.decode("5F060D3716B345C253F6749ABAC10917")),
Hex.decode("00000000000000000000000000000000"));
SICBlockCipher engine = new SICBlockCipher(new AESEngine());
engine.init(true, params);
SecureRandom rand = new SecureRandom();
byte[] plain = new byte[50000];
byte[] cipher = new byte[50000];
rand.nextBytes(plain);
engine.processBytes(plain, 0, plain.length, cipher, 0);
byte[] fragment = new byte[20];
engine.init(true, params);
engine.skip(10);
if (engine.getPosition() != 10) {
fail("skip position incorrect - 10 got " + engine.getPosition());
}
engine.processBytes(plain, 10, fragment.length, fragment, 0);
if (!areEqual(cipher, 10, fragment, 0)) {
fail("skip forward 10 failed");
}
engine.skip(1000);
if (engine.getPosition() != 1010 + fragment.length) {
fail(
"skip position incorrect - " + (1010 + fragment.length) + " got " + engine.getPosition());
}
engine.processBytes(plain, 1010 + fragment.length, fragment.length, fragment, 0);
if (!areEqual(cipher, 1010 + fragment.length, fragment, 0)) {
fail("skip forward 1000 failed");
}
engine.skip(-10);
if (engine.getPosition() != 1010 + 2 * fragment.length - 10) {
fail(
"skip position incorrect - "
+ (1010 + 2 * fragment.length - 10)
+ " got "
+ engine.getPosition());
}
engine.processBytes(plain, 1010 + 2 * fragment.length - 10, fragment.length, fragment, 0);
if (!areEqual(cipher, 1010 + 2 * fragment.length - 10, fragment, 0)) {
fail("skip back 10 failed");
}
engine.skip(-1000);
if (engine.getPosition() != 60) {
fail("skip position incorrect - " + 60 + " got " + engine.getPosition());
}
engine.processBytes(plain, 60, fragment.length, fragment, 0);
if (!areEqual(cipher, 60, fragment, 0)) {
fail("skip back 1000 failed");
}
long pos = engine.seekTo(1010);
if (pos != 1010) {
fail("position incorrect - " + 1010 + " got " + pos);
}
engine.processBytes(plain, 1010, fragment.length, fragment, 0);
if (!areEqual(cipher, 1010, fragment, 0)) {
fail("seek to 1010 failed");
}
engine.reset();
for (int i = 0; i != 5000; i++) {
engine.skip(i);
if (engine.getPosition() != i) {
fail("skip forward at wrong position");
}
engine.processBytes(plain, i, fragment.length, fragment, 0);
if (!areEqual(cipher, i, fragment, 0)) {
fail("skip forward i failed: " + i);
}
if (engine.getPosition() != i + fragment.length) {
fail("cipher at wrong position: " + engine.getPosition() + " [" + i + "]");
}
engine.skip(-fragment.length);
if (engine.getPosition() != i) {
fail("skip back at wrong position");
}
engine.processBytes(plain, i, fragment.length, fragment, 0);
if (!areEqual(cipher, i, fragment, 0)) {
fail("skip back i failed: " + i);
}
engine.reset();
}
}
