@Override
public void setup() {
/** makes only once a new Skipjack. */
if (algo == null) {
algo = new Skipjack();
if (publicKey == null) {
java.util.Random rnd = new java.util.Random();
rnd.nextBytes(publicKey);
}
algo.setupKey(publicKey);
} else {
algo.setupKey(publicKey);
}
}
@Override
public byte readByte() {
if (!isOpen()) {
return -1;
}
if (filename == null && count > maxCount) {
open = false;
return -1;
}
if (outAlgoBufferIx == outAlgoBuffer.length) {
algo.encrypt_block(inputAlgoBuffer, outAlgoBuffer);
for (outAlgoBufferIx = 0; outAlgoBufferIx < inputAlgoBuffer.length; outAlgoBufferIx++) {
inputAlgoBuffer[outAlgoBufferIx] = outAlgoBuffer[outAlgoBufferIx];
}
outAlgoBufferIx = 0;
}
byte prng = outAlgoBuffer[outAlgoBufferIx++];
if (filename == null) {
count++;
return prng;
}
/*
* we have a real filename to encrypt
*/
byte data = super.readByte();
return (byte) (prng ^ data);
}
