Misc50

hide.java

import java.awt.Point;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.PrintStream;

public class Hide
{
  public Hide() {}
  
  protected void steg(String paramString1, String paramString2)
  {
    BufferedImage localBufferedImage1 = loadImage(paramString2 + ".png");
    
    BufferedImage localBufferedImage2 = steg(paramString1, localBufferedImage1);
    
    try
    {
      javax.imageio.ImageIO.write(localBufferedImage2, "png", new java.io.File(paramString2 + "_out.png"));
    }
    catch (IOException localIOException) {
      throw new RuntimeException("Unable to write image!");
    }
  }
  
  protected BufferedImage steg(String paramString, BufferedImage paramBufferedImage)
  {
    paramString = paramString.length() + ":" + paramString;
    

    if (paramString.length() * 8 > paramBufferedImage.getWidth() * paramBufferedImage.getHeight()) {
      System.out.println("There won't be enough space to store this message!");
      System.out.println("Message length: " + paramString.length() + " bytes. " + "Image can hold a maximum of " + paramBufferedImage.getWidth() * paramBufferedImage.getHeight() / 8);
      
      throw new RuntimeException("There won't be enough space to store this message!");
    }
    
    byte[] arrayOfByte1 = paramString.getBytes();
    Point localPoint = new Point(0, 0);
    for (int k : arrayOfByte1) {
      for (int m = 0; m < 8; m++) {
        if ((k & 0x80) == 128) {
          paramBufferedImage.setRGB(x, y, setLeastSignificantBit(paramBufferedImage.getRGB(x, y), true));
        }
        else {
          paramBufferedImage.setRGB(x, y, setLeastSignificantBit(paramBufferedImage.getRGB(x, y), false));
        }
        k <<= 1;
        movePointer(localPoint, paramBufferedImage);
      }
    }
    
    return paramBufferedImage;
  }
  

  protected int setLeastSignificantBit(int paramInt, boolean paramBoolean)
  {
    paramInt >>= 1;
    paramInt <<= 1;
    if (paramBoolean) {
      paramInt++;
    }
    return paramInt;
  }
  
  protected void movePointer(Point paramPoint, BufferedImage paramBufferedImage)
  {
    if (x == paramBufferedImage.getWidth() - 1) {
      x = -1;
      y += 1;
    }
    x += 1;
    
    if (y == paramBufferedImage.getHeight()) {
      throw new RuntimeException("Pointer moved beyond the end of the image");
    }
  }
  
  private BufferedImage loadImage(String paramString)
  {
    try {
      return javax.imageio.ImageIO.read(new java.io.File(paramString));
    }
    catch (IOException localIOException)
    {
      System.out.println("Unable to load \"" + paramString + "\"");
      System.exit(0);
    }
    return null;
  }
  
  public static void main(String[] paramArrayOfString)
  {
    if (paramArrayOfString.length < 2) {
      System.out.println("Input Arguments Is Not Valid.");
      System.out.println("Run By 'java -jar Hide.jar `file-path` `message`'");
      
      return;
    }
    
    System.out.println("Welcome!\nDecrypt The Image And Capture The Flag!");
    
    Hide localHide = new Hide();
    
    localHide.steg(paramArrayOfString[1], paramArrayOfString[0]);
  }
}