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1Exception in thread "main" java.lang.ClassCastException: javax.crypto.CipherInputStream cannot be cast to javax.imageio.stream.ImageOutputStream
2at encypt.com.trial.main(trial.java:82)
3	
4public class trial {
5   public static void main(String[] arg) throws Exception {
6
7   // Scanner to read the user's password. The Java cryptography
8   // architecture points out that strong passwords in strings is a
9   // bad idea, but we'll let it go for this assignment.
10   Scanner scanner = new Scanner(System.in);
11   // Arbitrary salt data, used to make guessing attacks against the
12   // password more difficult to pull off.
13   byte[] salt = { (byte) 0xc7, (byte) 0x73, (byte) 0x21, (byte) 0x8c,
14           (byte) 0x7e, (byte) 0xc8, (byte) 0xee, (byte) 0x99 };
15
16   {
17     File inputFile = new File("sheep.png");
18      BufferedImage input = ImageIO.read(inputFile);
19      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
20      SecretKeyFactory keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
21     // Get a password from the user.
22     System.out.print("Password: ");
23     System.out.flush();
24     PBEKeySpec pbeKeySpec = new PBEKeySpec(scanner.nextLine().toCharArray());          
25     // Set up other parameters to be used by the password-based
26     // encryption.
27     PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, 20);
28     SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);
29     // Make a PBE Cyhper object and initialize it to encrypt using
30     // the given password.
31     Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
32     pbeCipher.init(Cipher.ENCRYPT_MODE, pbeKey, pbeParamSpec);
33     FileOutputStream output = new FileOutputStream("sheepTest.png");
34     CipherOutputStream cos = new CipherOutputStream(
35            output, pbeCipher);
36       //File outputFile = new File("image.png");
37         ImageIO.write(input,"PNG",cos);
38      cos.close();          
39
40   }
41   // Now, create a Cipher object to decrypt for us. We are repeating
42   // some of the same code here to illustrate how java applications on
43   // two different hosts could set up compatible encryption/decryption
44   // mechanisms.
45  {
46       File inputFile = new File("sheepTest.png");
47         BufferedImage input = ImageIO.read(inputFile);
48       // Get another (hopefully the same) password from the user.
49      System.out.print("Decryption Password: ");
50       System.out.flush();
51       PBEKeySpec pbeKeySpec = new PBEKeySpec(scanner.next().toCharArray());
52       // Set up other parameters to be used by the password-based
53       // encryption.
54       PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, 20);
55       SecretKeyFactory keyFac = SecretKeyFactory
56               .getInstance("PBEWithMD5AndDES");
57       SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);
58       // Make a PBE Cyper object and initialize it to decrypt using
59       // the given password.
60       Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
61       pbeCipher.init(Cipher.DECRYPT_MODE, pbeKey, pbeParamSpec);
62       // Decrypt the ciphertext and then print it out.
63       /*byte[] cleartext = pbeCipher.doFinal(ciphertext);
64       System.out.println(new String(cleartext));*/
65       FileInputStream output = new FileInputStream("sheepTest.png");
66       CipherInputStream cos = new CipherInputStream(
67              output, pbeCipher);
68        ImageIO.write(input,"PNG",(ImageOutputStream) cos);
69        cos.close();
70
71   }
72   }
73}
74	
75ImageIO.write(input,"PNG",(ImageOutputStream) cos);
76	
77FileOutputStream output = new FileOutputStream("sheepTest.png");
78        CipherOutputStream cos = new CipherOutputStream(output, pbeCipher);
79        ImageIO.write(input, "PNG", cos);
80        cos.close();