de todas decidi quedarme con estas
JAVA
Código:
PHP
public class Steganography {
public Steganography() {
}
public boolean encode(String path, String original, String ext1, String stegan, String message) {
String file_name = image_path(path, original, ext1);
BufferedImage image_orig = getImage(file_name);
BufferedImage image = user_space(image_orig);
image = add_text(image, message);
return (setImage(image, new File(image_path(path, stegan, "png")), "png"));
}
public String decode(String path, String name) {
byte[] decode;
try {
//user space is necessary for decrypting
BufferedImage image = user_space(getImage(image_path(path, name, "png")));
decode = decode_text(get_byte_data(image));
return (new String(decode));
} catch (Exception e) {
JOptionPane.showMessageDialog(null,
"There is no hidden message in this image!", "Error",
JOptionPane.ERROR_MESSAGE);
return "";
}
}
private String image_path(String path, String name, String ext) {
return path + "/" + name + "." + ext;
}
private BufferedImage getImage(String f) {
BufferedImage image = null;
File file = new File(f);
try {
image = ImageIO.read(file);
} catch (Exception ex) {
JOptionPane.showMessageDialog(null,
"Image could not be read!", "Error", JOptionPane.ERROR_MESSAGE);
}
return image;
}
private boolean setImage(BufferedImage image, File file, String ext) {
try {
file.delete(); //delete resources used by the File
ImageIO.write(image, ext, file);
return true;
} catch (Exception e) {
JOptionPane.showMessageDialog(null,
"File could not be saved!", "Error", JOptionPane.ERROR_MESSAGE);
return false;
}
}
private BufferedImage add_text(BufferedImage image, String text) {
//convert all items to byte arrays: image, message, message length
byte img[] = get_byte_data(image);
byte msg[] = text.getBytes();
byte len[] = bit_conversion(msg.length);
try {
encode_text(img, len, 0); //0 first positiong
encode_text(img, msg, 32); //4 bytes of space for length: 4bytes*8bit = 32 bits
} catch (Exception e) {
JOptionPane.showMessageDialog(null,
"Target File cannot hold message!", "Error", JOptionPane.ERROR_MESSAGE);
}
return image;
}
private BufferedImage user_space(BufferedImage image) {
BufferedImage new_img = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_3BYTE_BGR);
Graphics2D graphics = new_img.createGraphics();
graphics.drawRenderedImage(image, null);
graphics.dispose(); //release all allocated memory for this image
return new_img;
}
private byte[] get_byte_data(BufferedImage image) {
WritableRaster raster = image.getRaster();
DataBufferByte buffer = (DataBufferByte) raster.getDataBuffer();
return buffer.getData();
}
private byte[] bit_conversion(int i) {
//only using 4 bytes
byte byte3 = (byte) ((i & 0xFF000000) >>> 24); //0
byte byte2 = (byte) ((i & 0x00FF0000) >>> 16); //0
byte byte1 = (byte) ((i & 0x0000FF00) >>> 8); //0
byte byte0 = (byte) ((i & 0x000000FF));
//{0,0,0,byte0} is equivalent, since all shifts >=8 will be 0
return (new byte[]{byte3, byte2, byte1, byte0});
}
private byte[] encode_text(byte[] image, byte[] addition, int offset) {
//check that the data + offset will fit in the image
if (addition.length + offset > image.length) {
throw new IllegalArgumentException("File not long enough!");
}
//loop through each addition byte
for (int i = 0; i < addition.length; ++i) {
//loop through the 8 bits of each byte
int add = addition[i];
for (int bit = 7; bit >= 0; --bit, ++offset) //ensure the new offset value carries on through both loops
{
int b = (add >>> bit) & 1;
image[offset] = (byte) ((image[offset] & 0xFE) | b);
}
}
return image;
}
private byte[] decode_text(byte[] image) {
int length = 0;
int offset = 32;
for (int i = 0; i < 32; ++i) //i=24 will also work, as only the 4th byte contains real data
{
length = (length << 1) | (image[i] & 1);
}
byte[] result = new byte[length];
for (int b = 0; b < result.length; ++b) {
for (int i = 0; i < 8; ++i, ++offset) {
result[b] = (byte) ((result[b] << 1) | (image[offset] & 1));
}
}
return result;
}
public static void main(String[] args) {
Steganography st = new Steganography();
st.encode("C:\\java\\netbeans\\steganografia\\","kk","png","aaa","la policia esta loca loca");
String salida=st.decode("C:\\java\\netbeans\\steganografia\\", "aaa");
System.out.println(salida);
}
}
Código PHP:
<?php
function encode(){
$img=imagecreatefromjpeg("kk.jpg");
$message='Hello World'.chr(0);
$x=imagesx($img);
$y=imagesy($img);
$px=0;
$py=23;
$h=23;
for($i=0;$i<strlen($message);$i++) {
$px+=$h;
if($px>$x) {
$px=$px%$x;
$py+=$h;
}
$rgb=imagecolorat($img,$px,$py);
$R=($rgb >> 16) & 0xFF;
$G=($rgb >> 8) & 0xFF;
$B=$rgb & 0xFF;
$m=ord($message{$i});
$R=($R&0xf8)| ($m&0x07);
$G=($B&0xf8)|(($m>>3)&0x07);
$B=($B&0xf8)| (($m>>6)&0x03);
$t=imagecolorallocate($img,$R,$G,$B);
imagesetpixel($img ,$px,$py,$t);
}
imagepng($img,'deadsea2.png');
imagedestroy($img);
}
function decode(){
$img = imagecreatefrompng("deadsea2.png");
$message='';
$x=imagesx($img);
$y=imagesy($img);
$px=0;
$py=23;
$h = 23;
while( TRUE ){
$px += $h;
if( $px > $x ) {
$px = $px%$x;
$py += $h;
}
$rgb = imagecolorat($img, $px, $py);
$R = ($rgb >> 16) & 0x7;
$G = ($rgb >> 8) & 0x7;
$B = $rgb & 0x3;
$m = $R + ($G<<3) + ($B<<6);
$g=dechex($G<<3);
$b=dechex($B<<6);
if( $m==0 ) break;
$message .= chr($m);
}
return $message;
}
encode();
echo decode();
?> lo que pido no es que me lo hagan.. (para que nadie se enoje..) pero si alguien pudiera guiarme para encontrar el kid de la cuestion .. estaria muy agradecido.
