demo.cipher
Class MultipartEncryption

java.lang.Object
  |
  +--demo.cipher.MultipartEncryption

public class MultipartEncryption

extends Object

This class performs an automatic test of symmetric blockcipher algorithms implemented in the JCE MicroEdition. The test mainly aims at the multipart encryption feature (i.e. cipher.update() calls followed by a finalising cipher.doFinal() call). The testdata are generated dynamically for all modes of operation as well as for padding and no padding. Testdata for tests with mode strings NOT containing PKCS5Padding are trimmed to fit to n*bcipherblocksize. Furthermore, all (secret)keys and initilisation vectors are generated automatically.
Test procedure: - first generate random data for different: testdata, testdatasizes, keys, IV - encrypt and save the results on a hashtable - decrypt the encrypted data, compare it with the original input and store it on a hashtable The hashtable is used for the comparision with the standard edition. The testresults can be automatically checked against our standard library. To do so uncomment the required imports in the import section, the big block at the end of the class and the line that invokes the method to start the comparision (serach for "uncomment"). After every cipher.update call a Result object containing the processed data, number of bytes processed and number of the update call is created. This object is stored on a hashtable using transformation, keylength, testdatasize as key. After the same test is perfomed with the IAK-JCE library the testvalue is retrieved with the key and compared

Constructor Summary

MultipartEncryption()
Default constructor.

Method Summary

byte[]	decrypt(Cipher cipher, byte[] encryptedData, Vector results) Performs the actual decryption operation.
byte[]	encrypt(Cipher cipher, byte[] inData, Vector results) Performs the actual encryption operation.
protected byte[]	generateTestData(int size) Generates some random data.
static void	main(String[] args)
void	printResults(Hashtable list) Writes a list of Result objects to System.out.
void	start() Entry method for TestAll.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MultipartEncryption

public MultipartEncryption()

Default constructor.

Method Detail

start

public void start()

Entry method for TestAll.

encrypt

public byte[] encrypt(Cipher cipher,
                      byte[] inData,
                      Vector results)
               throws IOException,
                      CryptoException

Performs the actual encryption operation. The cipherobject has to be initialized before invoking this method.

Parameters:

cipher - the (pre-)initialized cipher object

inData - the data to encrypt

outData - the encrypted data

Throws:

CryptoException -

IOException -

decrypt

public byte[] decrypt(Cipher cipher,
                      byte[] encryptedData,
                      Vector results)
               throws IOException,
                      CryptoException

Performs the actual decryption operation. The cipherobject has to be initialized before invoking this method.

Parameters:

cipher -

encryptedData -

Returns:

Throws:

IOException -

CryptoException -

printResults

public void printResults(Hashtable list)

Writes a list of Result objects to System.out. From the intermediate dataarray (at most) only the first 64 bytes are printed.

Parameters:

list - with results

main

public static void main(String[] args)

generateTestData

protected byte[] generateTestData(int size)

Generates some random data.

Parameters:

size - number of random bytes to generate

Returns:

bytearray with random bytes