@Override
public boolean openInputStream() {
if (filename != null) {
super.openInputStream();
}
setup(); // make sure algorithm and keys/states are reset
count = 0;
countLastRead = SIZE;
actualSize = SIZE;
outAlgoBufferIx = outAlgoBuffer.length;
open = true;
return open;
}
@Override
public byte readByte() {
if (!isOpen()) {
return -1;
}
if (filename == null && count > maxCount) {
open = false;
return -1;
}
byte prng = -1;
/*
* encrypt file if exists
*/
if (filename != null) {
if (countLastRead == actualSize) { // end of buffer?
super.readByte(); // read & fill buffer from file
if (!isOpen()) {
return -1;
}
countLastRead = 0;
try {
algo.update(buffer, 0, actualSize, buffer);
} catch (ShortBufferException e) {
throw new IllegalStateException(e);
} // encrypt it
}
prng = buffer[countLastRead++];
count++;
return prng;
}
/*
* we have no real filename to encrypt
*/
if (outAlgoBufferIx == outAlgoBuffer.length) {
outAlgoBuffer = algo.update(inAlgoBuffer);
outAlgoBufferIx = 0;
}
prng = outAlgoBuffer[outAlgoBufferIx++];
count++;
return prng;
}
@Override
public void setupKeys() {
super.setupKeys();
}