demo.cipher
Class DES

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

public class DES

extends Object

This class tests the correctness of the DES and Triple-DES implementation. The test data is taken from SSLeay 0.8.0. Generally the test data consist of plain text, cipher text, key data and - except for the ECB mode - an initialization vector (iv). Note that the plain_data, cipher_data and key_data array variables hold text and key data for the ECB-Mode; all the variable names used by the other modes are self explanatory.

The test procedure can be devided into an encrypting and decrypting phase: First the plain data is encrypted according to the selected DES-Mode and compared with the given cipher data. The encrypting algorithm works correctly if each block of the cipher data equals to the corresponding block of the encrypted plain data. Following this the cipher data is decrypted and compared with the input plain data. This step prooves the correctness of the decrypting phase.

Constructor Summary

DES()

Method Summary

static void	main(String[] arg) Performs some tests for DES and Triple-DES.
void	start() Tests the several modes (ECB, CBC, PCBC, CFB, OFB, CBC for Triple-DES) of the DES algorithm.
boolean	testECB() Test the DES - ECB Mode implementation several times.
boolean	testMode(String algorithm, String mode, byte[] key, byte[] iv, byte[] plainData, byte[] cipherData) Test the DES implementation in the desired mode.

Methods inherited from class java.lang.Object

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

Constructor Detail

DES

public DES()

Method Detail

testECB

public boolean testECB()
                throws Exception

Test the DES - ECB Mode implementation several times.

testMode

public boolean testMode(String algorithm,
                        String mode,
                        byte[] key,
                        byte[] iv,
                        byte[] plainData,
                        byte[] cipherData)
                 throws Exception

Test the DES implementation in the desired mode.

Parameters:

algorithm - the implementation to test (DES, 3DES, ...)

mode - the mode of operation (CBC, PCBC, OFB, CFB)

key - the key to use

iv - the initializiation vector to use

plainData - the plainData to encrypt

cipherData - the encrypted data to test the correctness

start

public void start()

Tests the several modes (ECB, CBC, PCBC, CFB, OFB, CBC for Triple-DES) of the DES algorithm.

main

public static void main(String[] arg)

Performs some tests for DES and Triple-DES.