First assignment.

Due date: 09/13/05, at 9:00pm, via blackboard. (Use the dropbox feature to drop the archive to the instructor).

Total points: 50.

After following the general instructions to configure your home directory, and having installed
the BouncyCastle library:

Read the installation instructions for BouncyCastle at http://www.bouncycastle.org/specifications.html#install.
It contains the following code snippet:

/*
 * This will generate a random key, and encrypt the data
 */
Key             key;
KeyGenerator    keyGen;
Cipher          encrypt;

Security.addProvider(new BouncyCastleProvider());

try
{
    // "BC" is the name of the BouncyCastle provider
    keyGen = KeyGenerator.getInstance("DES", "BC");
    keyGen.init(new SecureRandom());

    key = keyGen.generateKey();

    encrypt = Cipher.getInstance("DES/CBC/PKCS5Padding", "BC");
}
catch (Exception e)
{
    System.err.println(e);
    System.exit(1);
}

encrypt.init(Cipher.ENCRYPT_MODE, key);

bOut = new ByteArrayOutputStream();
cOut = new CipherOutputStream(bOut, encrypt);

cOut.write("plaintext".getBytes());
cOut.close();

Your task is to extend the following snippet so that your file:

1. Opens a file whose name is given as first argument in the command line.  Use the class DataInputStream to read chars
   from the file, appending to a StringBuffer.  Once you consumed all the input from the file, you should get the String
   accumulated in the StringBuffer.  This will be encrypted in the next step.
   
   
2. Generate a random DES key, and use it to encrypt the String.
   
   
3. Save the generated key and iv AS OBJECTS (you will need to use the java.io.ObjectOutputStream class) in
   a file whose name is given as second argument in the command line.
   
   
4. Save the encrypted bytes (bOut.toByteArray()) using a DataOutputStream to a third file, whose name is given as the
   third argument in the command line.
   
   
5. Document your function using javadoc.
   
   

Create a package called assign1 to contain all the code you generate for this assignment. (To do this create a subdirectory assign1 inside the src subdirectory, and start each .java file with the header "package assign1;") Return a single zip archive, containing your "src/assign1" subdirectory.

IF YOU DON'T FOLLOW THE INPUT/OUTPUT SPECIFICATIONS ABOVE, YOUR MAXIMUM GRADE IS
30% OF THE TOTAL NUMBER OF POINTS (ASSUMING THE PROGRAM HAS CORRECT FUNCTIONALITY).

THIS IS AN INDIVIDUAL EFFORT.  CODE WILL BE CHECKED FOR SIMILARITY AND APPROPRIATE MEASURES
(SUCH AS GRADE REDUCTION AT THE LEAST) WILL BE TAKEN IF YOU ARE FOUND DO VIOLATE STUDENT
ETHIC CODE OF CONDUCT.

Good Luck,

Breno.
Modified on 09/02/05 at 7:40pm.