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POUnable to decrypt and read encrypted image file
 

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  1. POUnable to decrypt and read encrypted image file
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    <p>Here is my simple image encryption class, in which I am:</p> <ol> <li>Reading a image from one place into bytes</li> <li>Encrypting those bytes</li> <li>Again create image from these encrypted bytes</li> </ol> <p>Code:</p> <pre><code>public class ImageEncrypt { Cipher cipher; public static byte[] convertImageToByteArray(String sourcePath) { byte[] imageInByte = null; try{ BufferedImage originalImage = ImageIO.read(new File( sourcePath)); // convert BufferedImage to byte array ByteArrayOutputStream baos = new ByteArrayOutputStream(); ImageIO.write(originalImage, "jpg", baos); baos.flush(); imageInByte = baos.toByteArray(); baos.close(); }catch(Exception e){ e.printStackTrace(); } return imageInByte; } public static void convertByteArrayToImage(byte[] b , String path) { try{ InputStream in = new ByteArrayInputStream(b); BufferedImage bImageFromConvert = ImageIO.read(in); ImageIO.write(bImageFromConvert, "jpg", new File( path)); }catch(Exception e) { e.printStackTrace(); } } public static void main(String args []){ final String strPassword = "password12345678"; SecretKeySpec initVector = new SecretKeySpec(strPassword.getBytes(), "AES"); AlgorithmParameterSpec paramSpec = new IvParameterSpec(strPassword.getBytes()); try{ Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, initVector, paramSpec); byte[] ecrypted = cipher.doFinal(convertImageToByteArray("C:/Users/user/Desktop/a.jpg")); convertByteArrayToImage(ecrypted,"C:/Users/user/user/enc.jpg"); System.out.println("converted to encrypted file .... "); }catch(Exception e){ e.printStackTrace(); } } </code></pre> <p>Now I am getting problem in step three when I try to make image from encrypted bytes. It throws an exception given below:</p> <pre><code>java.lang.IllegalArgumentException: image == null! at javax.imageio.ImageTypeSpecifier.createFromRenderedImage(ImageTypeSpecifier.java:925) at javax.imageio.ImageIO.getWriter(ImageIO.java:1591) at javax.imageio.ImageIO.write(ImageIO.java:1520) at ImageEncrypt.convertByteArrayToImage(ImageEncrypt.java:55) at ImageEncrypt.main(ImageEncrypt.java:83) </code></pre> <p>I don't know where I am going wrong? I am doing the same to convert files (docs, pdf, etc.) to encrypt and it works fine (of course in that case I am using different stream classes for byte conversion) but I am unable to understand why it is messing up here?</p>
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