Bad Position Exception

I have posted this in the concurrency thread, as I think this is a concurrency issue, but it is hard to know because my code is throwing exceptions that are hard to understand.
The exception I am getting is "bad position" followed by a number, eg "bad position: 111787".
This seems to happen when I am accessing a Vector, Hashtable or ByteArrayOutputStream in a multi-threaded program, so I am assuming it is some kind of concurrency issue. However, I would have expected to get a recognisable exception message such as "ConcurrentModificationException" or something like that.
Does anyone have any idea what this exception is? Am I barking up the wrong tree in assuming it is a concurrency exception?
Thanks

Searching the JDK7 source gives
sabre@beta:~/jdk7$ find . -name "*.java" -exec grep -il "bad position" {} \;
./jdk/src/share/classes/javax/swing/text/DocumentFilter.java
./jdk/src/share/classes/javax/swing/text/Document.java
./jdk/src/share/classes/javax/swing/text/JTextComponent.java
./jdk/src/share/classes/javax/swing/text/Segment.java
Only Segment.java and JTextComponent have that as part of an exception (IllegalArgumentException) message.
Since these are both Swing classes, if this is a concurrency issue then I would suspect it is caused by you not updating something in the Swing event thread.

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I am writing a class to encrypt licencing information onto a text file in Base64 encoding. This write aspect works fine but the reading the licence back throw a Bad Padding Exception. (error and code below) Any assistance will be much appreciated
javax.crypto.BadPaddingException: Given final block not properly padded
at com.sun.crypto.provider.SunJCE_h.b(DashoA6275)
at com.sun.crypto.provider.SunJCE_h.b(DashoA6275)
at com.sun.crypto.provider.AESCipher.engineDoFinal
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at javax.crypto.Cipher.doFinal(DashoA6275)
at Encryptor.encrypt(Encryptor.java:117)
at Encryptor.loadAllEncryptedLayerLicences
(Encryptor.java:158)
at Encryptor.main(Encryptor.java:183)
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128);
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
//encrypt
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(value.getBytes());
//CONVERT TO BASE64 Encoding
String s = new sun.misc.BASE64Encoder().encode(encrypted);
//write the encrypted data to the file
fos = new FileOutputStream("C:\\aes\\output.properties");
new PrintStream(fos).println("layerhandle\t"+s);
fos.flush();
//fos.close();
//decrypt
byte[] buf = new sun.misc.BASE64Decoder().decodeBuffer(value);
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
//read from file and decrypt the values
byte[] unecrypted = cipher.doFinal(buf);
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String s = new
sun.misc.BASE64Encoder().encode(encrypted);
//write the encrypted data to the file
fos = new
FileOutputStream("C:\\aes\\output.properties");
new PrintStream(fos).println("layerhandle\t"+s);
fos.flush();
//fos.close();This looks suspicious. You should close the PrintStream and not just flush 'fos'. Closing the PrintSteam will close 'fos'. This failure to close the print stream could be the cause your problem.
>
>
//decrypt
byte[] buf = new
sun.misc.BASE64Decoder().decodeBuffer(value);If there is a problem with decrypt then it may be because you have not read the 'value' or the 'key' properly.

Why bad padding exception???

hi guys
here i am trying to decrypt the already encrypted string by one different encrpytion algo.
in the example i have encrypted the string by des and then i tried to decrypt it using blowfish but it gives as the output null instead of a random string...because of a bad padding exception(check line 86). help to remove the exception.
if we try to decrypt the des encrypted string by des again it give n padding exception. why with blowfish???
// CIPHER / GENERATORS
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.KeyGenerator;
// KEY SPECIFICATIONS
import java.security.spec.KeySpec;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEParameterSpec;
// EXCEPTIONS
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidKeyException;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import java.io.UnsupportedEncodingException;
import java.io.IOException;
public class StringEncrypter {
Cipher ecipher;
Cipher dcipher;
StringEncrypter(SecretKey key, String algorithm) {
try {
ecipher = Cipher.getInstance(algorithm);
dcipher = Cipher.getInstance(algorithm);
ecipher.init(Cipher.ENCRYPT_MODE, key);
dcipher.init(Cipher.DECRYPT_MODE, key);
} catch (NoSuchPaddingException e) {
System.out.println("EXCEPTION: NoSuchPaddingException");
} catch (NoSuchAlgorithmException e) {
System.out.println("EXCEPTION: NoSuchAlgorithmException");
} catch (InvalidKeyException e) {
System.out.println("EXCEPTION: InvalidKeyException");
public String encrypt(String str) {
try {
// Encode the string into bytes using utf-8
byte[] utf8 = str.getBytes("UTF8");
// Encrypt
byte[] enc = ecipher.doFinal(utf8);
// Encode bytes to base64 to get a string
return new sun.misc.BASE64Encoder().encode(enc);
} catch (BadPaddingException e) {
} catch (IllegalBlockSizeException e) {
} catch (UnsupportedEncodingException e) {
} catch (IOException e) {
return null;
public String decrypt(String str) {
try {
// Decode base64 to get bytes
byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
// Decrypt
byte[] utf8 = dcipher.doFinal(dec);
// Decode using utf-8
return new String(utf8, "UTF8");
} catch (BadPaddingException e) {
System.out.println("BAd padding excception");
} catch (IllegalBlockSizeException e) {
System.out.println("IllegalBlockSizeException");
} catch (UnsupportedEncodingException e) {
System.out.println("UnsupportedEncodingException");
} catch (IOException e) {
System.out.println("IOException");
return null;
public static void testUsingSecretKey() {
try {
          String secretString = "code cant be decrypted!";
          SecretKey desKey = KeyGenerator.getInstance("DES").generateKey();
          SecretKey blowfishKey = KeyGenerator.getInstance("Blowfish").generateKey();
     StringEncrypter desEncrypter = new StringEncrypter(desKey, desKey.getAlgorithm());
          StringEncrypter blowfishEncrypter = new StringEncrypter(blowfishKey, blowfishKey.getAlgorithm());
          String desEncrypted = desEncrypter.encrypt(secretString);
     String desDecrypted = desEncrypter.decrypt(desEncrypted);
     String blowfishDecrypted = blowfishEncrypter.decrypt(desEncrypted);
     System.out.println(desKey.getAlgorithm() + " Encryption algorithm");
     System.out.println(" Original String : " + secretString);
     System.out.println(" Encrypted String : " + desEncrypted);
     System.out.println(" Decrypted String : " + desDecrypted);
     System.out.println();
     System.out.println(blowfishKey.getAlgorithm() + " Encryption algorithm");
     System.out.println(" Original String : " + desEncrypted);
     System.out.println(" Decrypted String : " + blowfishDecrypted);
     System.out.println();
     } catch (NoSuchAlgorithmException e) {
     public static void main(String[] args) {
     testUsingSecretKey();
}

peter_crypt wrote:
you are right but this is my question. why cant we do that?? it should be possible.by the way i am working on a project for cryptanalysis . there i need to implement it.You need to spend more time studying and less time programming -
1) Applied Cryptography, Schneier, Wiley, ISBN 0-471-11709-9
2) Practical Cryptography, Ferguson and Schneier, Wiley, ISBN 0-471-22357-3
3) Java Cryptography, Knudsen, O'Reilly, ISBN 1-56592-402-9 dated but still a good starting point
4) Beginning Cryptography with Java, written by David Hook and published by WROX .

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Hi, I need some help Tryng to crypt and decrypt a String using AES/ECB/PKCS5Padding
I paste my code below
Crypt
Cipher cipher;
         byte[] pass=new byte[]{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}; // just for example
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And on the other side Decrypt
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Nothing obviously wrong but we have no view of your Base64 encoder and decoder. You should check
a) that the bytes of your key are the same in both methods
b) that the bytes resulting in your decrypt methodbyte[] buf =Base64.decodeBase64(da_decifrare.getBytes("utf-8"));are exactly the same as those created in the encrypt method using byte[] enc = cipher.doFinal(utf8);
      Note - since Base64 consists of only ASCII characters you should use String cifrata =new String (Base64.encodeBase64(enc),"ASCII");and byte[] buf =Base64.decodeBase64(da_decifrare.getBytes("ASCII"));though this flaw should not be the cause of your exception.
Edited by: sabre150 on Dec 15, 2009 12:32 PM

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I've got a small program to save/load passwords from a file, but the encryption is causing me a few issues, currently I'm stuck on a bad padding exception (line 120).
The code can be found here: http://www.rafb.net/paste/results/R8NoZB78.html
Does anyone know how I can resolve the error? Thanks.

    private String decrypt(String encrypted) {
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encrypt()
string -> bytes -> encoded bytes -> encrypted encoded bytes -> string
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On 10/8/07 10:45 AM, in article
fedfqn$1ok$[email protected], "furiet"
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> With FF 2.0.0.7 and Safari 1.3.2 (v312.6) on a Mac, Il
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> of an h2 text title its <dv> container, itself
above another <dv> element.
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I have attached a CView in CDockablePane and it works fine
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//===================================================
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Bad Padding exception when trying to decrypt the file

Hi i am trying to decypt a file in java which is encrypted in c++ but i get the pad padding exception
javax.crypto.BadPaddingException: Given final block not properly padded
     at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
     at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
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try {
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MuppidiJava wrote:
Sorry man..i got the same key in java..which you got i followed everything was mentioned... but i did not get the same key using C++ But did you compensate in your Java for the C++ bug I highlighted involving the creation of the bytes from the password? I bet you didn't. Did you even talk to your C++ guys about the bug? I bet you didn't.
as i said i was not good at it..but your sample cpp code would have fixed it easily. Did you look at the Microsoft Crypto documentation? I bet you didn't. Did you try to learn enough C++ to add in the few lines of code needed to export and print out the generated key? I bet you didn't. Did you try to get the C++ guys to help you on this?
I runing short of timeSorry but your time management problem is your problem.
..thanks for your support..The BadPaddingException problem you have is almost certainly as a result of you not generating the same key bytes in your Java as are being generated by the C++. Since you get the same bytes as I do when not compensating for the C++ bug it is almost certain that the C++ bug is the root cause of your problem. If I compensate for the C++ bug I get a match between my C++ key bytes and my Java key bytes. If you don't spend effort in understanding the C++ bug and how to correct for it in your Java you are stuffed. If you don't spend time learning enough C++ to be able to export the C++ key then you will have great difficulty in proving that you C++ key bytes actually match your Java key bytes. I have explained what the bug is - the Java code to compensate for the bug is actually trivial. I have explained how to export the C++ key - the C++ code for this is small and straightforward. I'm not going to provide the C++ code nor the Java compensation code. This is a 'forum' and not a programming service.
P.S. You still have a problem with the '.' key on your keyboard.

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Thanks.

GSP wrote:
Folks, My CORBA App is throwing the following exception:
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Is this exception expected? Should all string values be necessarily non-null?No, not all. But it can't be null in this case (given the provided details).
It this application developed by a company called Atomikos?

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