private void testOldCTS(
int id, BlockCipher cipher, CipherParameters params, byte[] input, byte[] output)
throws Exception {
byte[] out = new byte[input.length];
BufferedBlockCipher engine = new OldCTSBlockCipher(cipher);
engine.init(true, params);
int len = engine.processBytes(input, 0, input.length, out, 0);
engine.doFinal(out, len);
if (!areEqual(output, out)) {
fail(
"failed encryption expected "
+ new String(Hex.encode(output))
+ " got "
+ new String(Hex.encode(out)));
}
engine.init(false, params);
len = engine.processBytes(output, 0, output.length, out, 0);
engine.doFinal(out, len);
if (!areEqual(input, out)) {
fail(
"failed decryption expected "
+ new String(Hex.encode(input))
+ " got "
+ new String(Hex.encode(out)));
}
}
private void testExceptions() throws InvalidCipherTextException {
BufferedBlockCipher engine = new CTSBlockCipher(new DESEngine());
CipherParameters params = new KeyParameter(new byte[engine.getBlockSize()]);
engine.init(true, params);
byte[] out = new byte[engine.getOutputSize(engine.getBlockSize())];
engine.processBytes(new byte[engine.getBlockSize() - 1], 0, engine.getBlockSize() - 1, out, 0);
try {
engine.doFinal(out, 0);
fail("Expected CTS encrypt error on < 1 block input");
} catch (DataLengthException e) {
// Expected
}
engine.init(true, params);
engine.processBytes(new byte[engine.getBlockSize()], 0, engine.getBlockSize(), out, 0);
try {
engine.doFinal(out, 0);
} catch (DataLengthException e) {
fail("Unexpected CTS encrypt error on == 1 block input");
}
engine.init(false, params);
engine.processBytes(new byte[engine.getBlockSize() - 1], 0, engine.getBlockSize() - 1, out, 0);
try {
engine.doFinal(out, 0);
fail("Expected CTS decrypt error on < 1 block input");
} catch (DataLengthException e) {
// Expected
}
engine.init(false, params);
engine.processBytes(new byte[engine.getBlockSize()], 0, engine.getBlockSize(), out, 0);
try {
engine.doFinal(out, 0);
} catch (DataLengthException e) {
fail("Unexpected CTS decrypt error on == 1 block input");
}
try {
new CTSBlockCipher(new SICBlockCipher(new AESEngine()));
fail("Expected CTS construction error - only ECB/CBC supported.");
} catch (IllegalArgumentException e) {
// Expected
}
}
