Aes Encryption

[rohitpatidar3]

Can any one help me out???
Here is a code i got IllegalBlockSizeException in decrypt method

package Encryption;

import java.io.*;
import java.security.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.crypto.Cipher.*;
import javax.crypto.*;
import javax.crypto.spec.*;

public class EncMain {

    HexPass h = new HexPass();
    GenKey g = new GenKey();
    Cipher cipher;

    static String message = " AES algorithm  implementation";

    public static void main(String[] args) throws InvalidKeyException {
        try {
            EncMain m = new EncMain();
            byte[] btt = message.getBytes();
            System.out.println("Encrypted string-:" + m.encrypt(btt));
            System.out.println("Decrypted string-:" + m.decrpyt(btt));
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(EncMain.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InvalidAlgorithmParameterException ex) {
            Logger.getLogger(EncMain.class.getName()).log(Level.SEVERE, null, ex);
        } catch (NoSuchPaddingException ex) {
            Logger.getLogger(EncMain.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(EncMain.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public String encrypt(byte[] encrypted) {
        SecretKeySpec skeySpec1 = null;

        try {
           cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            
            skeySpec1 = g.Gen();
            byte[] rawBytes = {66, -56, -63, -97, -23, -9, 27, -3, 63, -115, 85, 81, -31, 127, -48, -92};
            IvParameterSpec iv = new IvParameterSpec(rawBytes, 0, rawBytes.length);
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec1, iv);
            byte[] encrypt = cipher.doFinal(encrypted);
            return h.asHex(encrypt);
        } catch (Exception ex) {
            return "their is an error";
        }

    }

    public String decrpyt(byte[] encrypted) throws InvalidKeyException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, NoSuchPaddingException, UnsupportedEncodingException {
        try {
            //here i got exception 
String ostring = null;
            SecretKeySpec skeySpec = null;
            skeySpec = g.Gen();
           byte[] rawBytes = {66, -56, -63, -97, -23, -9, 27, -3, 63, -115, 85, 81, -31, 127, -48, -92};
            IvParameterSpec iv = new IvParameterSpec(rawBytes, 0, rawBytes.length);
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] original = cipher.doFinal(encrypted);
            ostring = new String(original);
            return ostring;
        } 
        catch (IllegalBlockSizeException ex) {
            Logger.getLogger(EncMain.class.getName()).log(Level.SEVERE, null, ex);
            return "Their is an exception12";
        } catch (BadPaddingException ex) {
            Logger.getLogger(EncMain.class.getName()).log(Level.SEVERE, null, ex);
            return "Their is an exception13";
        }
    }
}

class HexPass {

    public String asHex(byte[] buffer) {
        StringBuffer strbuf = new StringBuffer(buffer.length * 2);
        int i;
        for (i = 0; i < buffer.length; i++) {
            if (((int) buffer[i] & 0xff) < 0x10) {
                strbuf.append("0");
            }
            strbuf.append(Long.toString((int) buffer[i] & 0xff, 16));
        }
        return strbuf.toString();
    }
}

class GenKey {

    public static byte[] passToKey(String password) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest md = null;
        try {
            md = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException ex) {
            return new byte[0];
        }
        byte[] passwordBytes = null;
        try {
            passwordBytes = password.getBytes("ISO-8859-1");
        } catch (UnsupportedEncodingException ex) {
            passwordBytes = new byte[0];
        }
        return md.digest(passwordBytes);
    }

    public SecretKeySpec Gen() throws NoSuchAlgorithmException, UnsupportedEncodingException {
        String password = "437829ADGR83G88D";
        byte[] rawKey = passToKey(password);
        SecretKeySpec skeySpec = new SecretKeySpec(rawKey, "AES");
        return skeySpec;
    }
}

[mrmatt1111]

Considering AES is the replacement for DES... i would vote AES :)

[Eranga]

Considering AES is the replacement for DES... i would vote AES :)

Modern Cryptography, I vote for AES too.

[Eranga]

@OP, Can you post the complete error message here to see?

[rohitpatidar3]

Encryptd string:d93953141f1edf506fa78480562dbefa154e6b62e8f 00479f5cebed70c6cc423
javax.crypto.spec.IvParameterSpec@1eec612
Apr 10, 2010 1:52:04 PM Encryption.EncMain decrpyt
Decryptd string:error1
SEVERE: null
javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipher
at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
at com.sun.crypto.provider.AESCipher.engineDoFinal(Da shoA13*..)
at javax.crypto.Cipher.doFinal(DashoA13*..)
at Encryption.EncMain.decrpyt(EncMain.java:56)
at Encryption.EncMain.main(EncMain.java:28)

[Eranga]

This is what you misses,

javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipher

on line,

at Encryption.EncMain.decrpyt(EncMain.java:56)

[rohitpatidar3]

yeah .....i got same message...
pls post if u've solution

[Eranga]

Check the input length lol. Simply just put a print line and check the value.