Javax.crypto.IllegalBlockSizeException help?

Question

I am making a plain text encrypt/decrypt program for personal use.
It will compile just fine, but if I try to run the decryption part, it freaks out on me.
It keeps on saying:
javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipher
This is my code. I cannot figure out what is wrong...
import java.io.*;
import java.util.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.spec.IvParameterSpec;
import static methods.methods.*;
public class Base
    public static void main()
        Scanner kbReader = new Scanner(System.in);
        clear("Method > ");
        String s = kbReader.next();
        if(s.equals("output"))
            try{output();}
            catch(Exception e){e.printStackTrace();}
        if(s.equals("input"))
            try{input();}
            catch(Exception e){e.printStackTrace();}
        if(s.equals("genKey"))
            genKey();
        if(s.equals("x"))
            clear("Well it stopped.");
        else
            main();
    public static void output()
        throws IOException,
        NoSuchAlgorithmException,
        NoSuchPaddingException,
        InvalidKeyException,
        IllegalBlockSizeException,
        BadPaddingException,
        InvalidAlgorithmParameterException
        Scanner kbReader = new Scanner(System.in);
        Scanner kbr = new Scanner(System.in);
        clear("What is the name of the file?\nName > ");
        fileName = kbReader.next();
        String s2 = "/Users/ewsmith/base/" + fileName;
        FileWriter fw = new FileWriter(s2, true);
        PrintWriter output = new PrintWriter(fw, true);
        clear("Key > ");
        byte key[] = new byte[16];
        for(int j=0; j<16; j++)
            key[j] = kbReader.nextByte();
        clear("IV > ");
        byte ivBytes[] = new byte[16];
        for(int j=0; j<16; j++)
            ivBytes[j] = kbReader.nextByte();
        IvParameterSpec iv = new IvParameterSpec(ivBytes);
        String s = new String("");
        String ss = new String("");
        clear("Enter what you want output to a file.\nType 'x' to finish writing.\n\n");
        while(true)
            s = kbReader.nextLine();
            if(s.equalsIgnoreCase("x"))
                break;
            ss = ss + s + "\n";
        byte data[] = ss.getBytes("UTF-8");
        Cipher c = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        SecretKeySpec k = new SecretKeySpec(key, "AES");
        c.init(Cipher.ENCRYPT_MODE, k, iv);
        c.doFinal(data);
        for(int j=0; j<data.length; j++)
            output.print(data[j] + " ");
        clear("This is your key.\n\n");
        for(int j=0; j<key.length; j++)
        System.out.print(key[j] + "  ");
        println("\n\nType in 'x' and press enter to continue.");
        boolean alive = true;
        while(alive)
            String s3 = kbr.nextLine();
            if(s3.equalsIgnoreCase("x"))
                alive = false;
        byte[] IV = c.getIV();
        clear("This is your IV:\n\n");
        for(int j=0; j<IV.length; j++)
            print(IV[j] + "  ");
        println("\n\nType x to continue.\n");
        String ew = "";
        while(true)
            ew = kbReader.nextLine();
            if(ew.equalsIgnoreCase("x"))
                break;
        output.close();
        fw.close();
    public static void input()
        throws IOException,
        NoSuchAlgorithmException,
        NoSuchPaddingException,
        InvalidKeyException,
        IllegalBlockSizeException,
        BadPaddingException,
        InvalidAlgorithmParameterException
        Scanner kbReader = new Scanner(System.in);
        Scanner kbr = new Scanner(System.in);
        Cipher c = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        clear("What is the name of the file?\nName > ");
        fileName = kbr.next();
        String s2 = "/Users/ewsmith/base/" + fileName;
        Scanner sf = new Scanner(new File(s2));
        int num = 1;
        clear("Key > ");
        byte key[] = new byte[16];
        for(int j=0; j<16; j++)
            key[j] = kbReader.nextByte();
        clear("IV > ");
        byte ivBytes[] = new byte[16];
        for(int j=0; j<16; j++)
            ivBytes[j] = kbReader.nextByte();
        IvParameterSpec iv = new IvParameterSpec(ivBytes);
        SecretKeySpec k = new SecretKeySpec(key, "AES");
        c.init(Cipher.DECRYPT_MODE, k, iv);
        clear("This text was stored inside the file.\n\n\n");
        int j = 0;
        ArrayList<Byte> ip = new ArrayList<Byte>();
        while(sf.hasNext())
            ip.add(sf.nextByte());
        byte input[] = new byte[ip.size()];
        for(j=0; j<ip.size(); j++)
            input[j] = ip.get(j);
        String recovered = new String(c.doFinal(input));
        println(recovered);
        sf.close();
        ip.clear();
        input = null;
        println("\n\nType in 'x' and press enter to continue.");
        boolean alive = true;
        while(alive)
            String s = kbReader.nextLine();
            if(s.equalsIgnoreCase("x"))
                alive = false;
    public static void genKey()
        Scanner kbReader = new Scanner(System.in);
        clear();
        Random ranGen = new SecureRandom();
        byte[] aesKey = new byte[16];
        ranGen.nextBytes(aesKey);
        for(int j=0; j<aesKey.length; j++)
        System.out.print(aesKey[j] + "  ");
        println("\n\nType in 'x' and press enter to continue.");
        boolean alive = true;
        while(alive)
            String s = kbReader.nextLine();
            if(s.equalsIgnoreCase("x"))
                alive = false;
    public static String fileName = "";
}Thank you in advance for answering.
EDIT:
It now says:
+     at com.sun.crypto.provider.SunJCE_h.b(DashoA12275)+
+     at com.sun.crypto.provider.SunJCE_h.b(DashoA12275)+
+     at com.sun.crypto.provider.AESCipher.engineDoFinal(DashoA12275)+
+     at javax.crypto.Cipher.doFinal(DashoA12275)+
+     at Base.input(Base.java:184)+
+     at Base.main(Base.java:23)+
+     at __SHELL3.run(__SHELL3.java:6)+
+     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)+
+     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)+
+     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)+
+     at java.lang.reflect.Method.invoke(Method.java:585)+
+     at bluej.runtime.ExecServer$3.run(ExecServer.java:819)+
Could this be an IV error?
Can negative IV's be used?
Edited by: eric_smith on Jan 6, 2010 9:25 PM
Edited by: eric_smith on Jan 7, 2010 9:51 AM

Answer 1

I turned this:
String recovered = new String(c.doFinal(input));into this:
String recovered = new String(input);and used 0's for the key and iv and the text was 'decrypted'.
Something tells me the problem is in the output and input cipher.init()
Can someone enlighten me as to what I am doing wrong?
EDIT: btw, the code came from the input method.
Edited by: eric_smith on Jan 7, 2010 9:28 PM