Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>First of all, no it is not a problem with every programming environment. OpenSSL which is written in C has support for large keys for example. From experience with both JCE and JNI I would however suggest that you find a way to use pure Java instead of loading a native library through JNI. It is just a lot easier.</p> <p><strong>A practical solution:</strong> Is your application installed using some kind of installer application during installation? If so, then one solution could be to use this installer to also install JCE.</p> <p>BouncyCastle unfortunately also uses JCE as stated in their <a href="http://www.bouncycastle.org/wiki/display/JA1/Frequently+Asked+Questions" rel="nofollow">FAQ</a>.</p> <p><strong>UPDATE 1:</strong> I found this library which might be what you are looking for. It doesn't seem to be maintained any longer however: <a href="http://www.cryptix.org/" rel="nofollow">http://www.cryptix.org/</a></p> <p><strong>UPDATE 2:</strong> GNU has a library which implements AES256: <a href="http://www.gnu.org/software/gnu-crypto/" rel="nofollow">http://www.gnu.org/software/gnu-crypto/</a> . More on the available ciphers here: <a href="http://www.gnu.org/software/gnu-crypto/manual/Ciphers.html" rel="nofollow">http://www.gnu.org/software/gnu-crypto/manual/Ciphers.html</a></p> <p>Code example using GNU-Crypto given that you already have your key loaded in <code>key_bytes</code>:</p> <pre><code>IBlockCipher cipher = CipherFactory.getInstance("AES"); Map attributes = new HashMap(); attributes.put(IBlockCipher.CIPHER_BLOCK_SIZE, new Integer(16)); attributes.put(IBlockCipher.KEY_MATERIAL, key_bytes); cipher.init(attributes); int bs = cipher.currentBlockSize(); for (int i = 0; i + bs &lt; pt.length; i += bs) { cipher.encryptBlock(pt, i, ct, i); } for (int i = 0; i + bs &lt; cpt.length; i += bs) { cipher.decryptBlock(ct, i, cpt, i); } </code></pre> <p>Please insure that you use a cryptographically secure random number generator such as <a href="http://docs.oracle.com/javase/6/docs/api/java/security/SecureRandom.html" rel="nofollow">SecureRandom</a> to create your 256 bytes for the key:</p> <pre><code>byte[] seed = xxx; // Be sure to get a good new seed on every client machine. SecureRandom random = new SecureRandom(seed); byte[] key_bytes = new byte[256]; random.nextBytes(key_bytes); </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POIs AES256 encryption decryption possible in Java without unlimited strength JCE files?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USuldall
    1. USuldall
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTDownMod
    1. COThe Bouncycastle lightweight API does *not* use the JCE and thus is not subject to the need for the unlimited jurisdiction crypto files.
      singulars
      1. PO
      1. USJames K Polk
    2. CO@GregS used this as base for an answer
      singulars
      1. PO
      1. USMaarten Bodewes
    3. COPointing to an unmaintained crypto library should normally end in a -1, but I'll leave it be as the other info is correct.
      singulars
      1. PO
      1. USMaarten Bodewes
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload