I'm perusing the JCE JavaDocs and intro docs and I'm a little lost. (I'm using JDK 1.5.0_17 by the way)
All I want to do is take a couple of strings and encrypt them with a simple password or key (symmetric) and store them as ASCII/UTF-8 in a text file. And then unencrypt in the code.
Context: I work in the retail space and there's a bunch of retail stores that will have store servers with configuration files for Java programs. Some of these config files will have lines that say,
I would rather it say something like,
Where the 'key' or 'password' to unlock the encryption is just hard-coded in the JAR file that contains the application. Granted, someone can decompile the JAR, but this level of security is acceptable for our purposes.
Is there a simple way to just say, convertStringToGobblygook(s, key) and then the reverse?
It looks like I can use Cipher, CipherInputStream and CipherOutputStream wrapped over a StringReader/Writer or whatever. But even then, I'm getting confused as to the exact parameters to feed to the Cipher class.
Note that I don't need a fancy 1024-bit RSA blah-blah-blah encryption. Just something moderately better than, say, using ObjectOutputStream.
The steps need are rather stright forward, you need to create a key, this will be used to initialise the cypher algorthmn.
I tend to use AES as my algorithmn (it is symmetric), I usual use 32 BYTE Hex Strings, this could be hard code within the code I guess.
Use something like apache codec to convert the key (hex String) to a byte array.
Then create a SecretKeySpec using the byte array and the Algorthimn name.
This can then be used to create a Cipher object (with the mode of operation encryption/decryption).
Once you have your Cipher object you can use cipher.doFinal(string.getBytes()); where string is what you wish to encrypt.
This will return you a ByteArray which is encrypted.
Dont dump this out to a string, you are much better off converting it to a HexString, again using apache codec.