Re: A question about encrypting file using AES

"Daniel Dyer" <"You don't need it">
Mon, 08 Jan 2007 16:03:39 -0000
On Mon, 08 Jan 2007 15:53:25 -0000, JTL.zheng <> wrot=

my code is:

  public static boolean enDeCrypt(String keyStr, File fin, File fout) =


    try {
     FileInputStream in = new FileInputStream(fin);
      FileOutputStream out = new FileOutputStream(fout);
      Cipher desCipher = Cipher.getInstance("AES");
                            new SecretKeySpec(keyStr.getBytes("UTF-8")=


      CipherOutputStream cos = new CipherOutputStream(out, desCipher=


      byte[] enBuffer = new byte[4096];
      int n;
      while ( (n = != -1) {
        cos.write(enBuffer, 0, n);
    catch (Exception e) {
      return false;
    return true;

but it throw exception: Illegal key size or default
I used a 192-bit key
if I change the key's length, it will throw excepion: Invalid AES key length: 272
It seemed that it is not the problem about the length of the key
 how can I fix it

By default, the longest key that you can have is 128 bits. For longer =

keys you will need to download and install the unlimited strength =

cryptography policies available from Sun's website. You are not allowed=

them if you are a member of the Axis of Evil.


-- =

Daniel Dyer

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