Crypto/src/code/kalter/longflight/crypto/CIStream.java

   1 package code.kalter.longflight.crypto;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5
   6 /**
   7  * Шифровальный входной поток
   8  *
   9  * @author Kalter
  10  */
  11 public class CIStream extends InputStream {
  12
  13     private final InputStream istream;
  14     private final Random random;
  15
  16     public CIStream(InputStream istream, int key) {
  17         this.istream = istream;
  18         this.random = new Random(key);
  19     }
  20
  21     @Override
  22     public int read() throws IOException {
  23         int b = istream.read();
  24         b = (b << 4) | (b >> 4);
  25         b ^= random.random(0xFF);
  26         return b;
  27     }
  28
  29     @Override
  30     public int available() throws IOException {
  31         return istream.available();
  32     }
  33
  34     @Override
  35     public void close() throws IOException {
  36         istream.close();
  37     }
  38 }